Smith v. Schriro , 813 F.3d 1175 ( 2016 )


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  •                 FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    ROBERT DOUGLAS SMITH,                 Nos. 96-99025
    Petitioner-Appellant,            96-99026
    10-99011
    v.
    D.C. No.
    DORA B. SCHRIRO, Warden,            CV-87-00234-RMB
    Arizona, Department of
    Corrections,
    Respondent-Appellee.        OPINION
    Appeal from the United States District Court
    for the District of Arizona
    Cindy K. Jorgenson, District Judge, Presiding
    Argued and Submitted
    March 17, 2015—San Francisco, California
    Filed February 4, 2016
    Before: Mary M. Schroeder, Stephen Reinhardt,
    and Consuelo M. Callahan, Circuit Judges.
    Opinion by Judge Reinhardt;
    Concurrence by Judge Schroeder;
    Special Concurrence by Judge Reinhardt;
    Dissent by Judge Callahan
    2                       SMITH V. SCHRIRO
    SUMMARY*
    Habeas Corpus
    The panel reversed Arizona state prisoner Robert Douglas
    Smith’s death sentence in a case to which the Antiterrorism
    and Effective Death Penalty Act does not apply, and
    remanded to the district court with instructions to grant the
    writ of habeas corpus and return the case to the state court to
    reduce Smith’s sentence to life or natural life.
    The state court determined on remand that Smith was not
    intellectually disabled at the time of the offense and trial
    under Atkins v. Virginia, 
    536 U.S. 304
    (2002), which held
    that the execution of intellectually disabled criminals
    constitutes cruel and unusual punishment prohibited by the
    Eighth Amendment.
    The panel held that because the state court’s factual
    determination is not fairly supported by the record, a
    presumption of correctness does not apply. Judge Reinhardt
    would hold (section II.C.2) that deference is not due for the
    additional and independent reason that the state court
    rendered its finding that Smith was not intellectually disabled
    under a constitutionally impermissible legal standard.
    Reviewing the record de novo, and considering Smith’s
    intellectual functioning test scores and his history of
    significantly impaired adaptive behavior, the panel found that
    Smith satisfied by clear and convincing evidence the two
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    SMITH V. SCHRIRO                         3
    substantive prongs of Arizona’s definition of intellectual
    disability both prior to the age of eighteen and at the time of
    the crime.
    Judge Schroeder concurred in all of Judge Reinhardt’s
    opinion except section II.C.2.
    Specially concurring, Judge Reinhardt wrote to convey
    his serious concerns regarding the constitutionality of
    Arizona’s Atkins statute.
    Dissenting, Judge Callahan wrote that the majority
    reaches its conclusion that Smith was not intellectually
    disabled when he committed the murder by disregarding the
    findings of the state courts, denying those courts the
    deference they are due, and expressing supreme confidence
    in its own ability to detect past intellectual disability despite
    substantial conflicting evidence and the fact that Smith is not
    now intellectually disabled.
    4                        SMITH V. SCHRIRO
    COUNSEL
    S. Jonathan Young (argued), Williamson & Young, P.C.,
    Tucson, Arizona; Ralph E. Ellinwood, Ellinwood, Francis &
    Plowman LLP, Tucson, Arizona, for Petitioner-Appellant.
    Jeffrey L. Sparks (argued), Assistant Attorney General,
    Capital Litigation Section, Mark Brnovich, Attorney General,
    Robert E. Ellman, Solicitor General, Jeffrey A. Zick, Chief
    Counsel, Capital Litigation Section, Phoenix, Arizona, for
    Respondent-Appellee.
    OPINION
    REINHARDT, Circuit Judge:1
    This case, to which the Antiterrorism and Effective Death
    Penalty Act of 1996 (AEDPA) does not apply, returns to us
    following remand to the Arizona state court to conduct an
    Atkins evidentiary hearing. After that hearing the state trial
    court denied Smith’s Atkins claim, and the Arizona Court of
    Appeal and Arizona Supreme Court affirmed. The district
    court then found Smith’s Atkins claim without merit and
    denied his petition for a writ of habeas corpus. We now hold
    that Smith is intellectually disabled under Atkins, and we
    reverse.2
    1
    Judge Reinhardt’s opinion is the opinion of the court except for Section
    II.C.2. in which neither Judge Schroeder nor Judge Callahan joins.
    2
    Because we grant relief on the Atkins claim, we find it unnecessary to
    reach Smith’s claim of ineffective assistance of counsel.
    SMITH V. SCHRIRO                                5
    I. FACTUAL AND PROCEDURAL BACKGROUND3
    In 1982, Robert Smith was convicted in Arizona state
    court of kidnapping, sexual assault, and murder and sentenced
    to death. Lambright v. Stewart, 
    167 F.3d 477
    , 479 (9th Cir.
    1999), reh’g granted, vacated, 
    177 F.3d 901
    (9th Cir. 1999),
    rev’d, en banc, 
    191 F.3d 1181
    (9th Cir. 1999). On June 20,
    2002, the Supreme Court decided Atkins v. Virginia, 
    536 U.S. 304
    (2002), holding that the execution of intellectually
    disabled criminals constitutes “cruel and unusual
    punishment” prohibited by the Eighth Amendment.4 Under
    Atkins, if Smith was intellectually disabled at the time he
    committed the crime or at the time of his trial, he may not be
    executed. We suspended federal habeas proceedings, ordered
    supplemental briefing and remanded to the state court to
    determine whether Smith was intellectually disabled and thus
    ineligible for execution under Atkins.
    The Pima County Superior Court reopened discovery and
    held a two-day evidentiary hearing on October 29 and
    November 1, 2007. The court heard testimony by Dr.
    Thomas Thompson, a neuropsychologist and prescribing
    psychologist selected by Smith, who opined that there is a
    very high probability that Smith was intellectually disabled at
    the time the crime was committed in 1980. The court also
    heard testimony from Dr. Sergio Martinez, a psychologist
    3
    Because the lengthy factual and procedural history of this case is
    known to the parties and set forth in prior opinions, we recount only those
    portions directly relevant to the issues discussed herein.
    4
    Although both the parties and prior opinions in this case use the term
    “mental retardation,” we employ the term “intellectually disabled.” See
    Hall v. Florida, 
    134 S. Ct. 1986
    , 1990 (2014). We use “mental
    retardation” only when quoting material employing that term.
    6                     SMITH V. SCHRIRO
    selected by the State, who stated that there is a high degree of
    probability that Smith was not intellectually disabled in 1980.
    The parties entered numerous exhibits into evidence,
    including the deposition transcripts of twelve lay witnesses
    who described their observations of Smith as a child or young
    adult.
    Following the hearing, the Pima County Superior Court
    found on March 27, 2008, that Atkins did not preclude
    Smith’s execution. The Arizona Court of Appeals denied
    special action relief later that year, Smith v. Kearney, No. 2
    CA-SA 2008-0019, 
    2008 WL 2721155
    (Ariz. Ct. App. July
    11, 2008), and the Arizona Supreme Court denied Smith’s
    petition for review. In September 2010, we remanded this
    case to the district court for the limited purpose of
    considering Smith’s Atkins claim. The district court denied
    the claim in December 2012. Smith timely appealed.
    II. ANALYSIS
    A. Jurisdiction and Standard of Review
    We have jurisdiction under 28 U.S.C. §§ 1291 and 2253.
    Sivak v. Hardison, 
    658 F.3d 898
    , 905 (9th Cir. 2011). We
    review de novo the federal district court decision denying
    Smith’s 28 U.S.C. § 2254 habeas petition. Alvarado v. Hill,
    
    252 F.3d 1066
    , 1068 (9th Cir. 2001).
    Because Smith filed his federal habeas petition prior to
    AEDPA’s April 24, 1996 effective date, pre-AEDPA
    standards govern our review even though Smith filed
    amended petitions subsequent to AEDPA’s effective date.
    See 
    Sivak, 658 F.3d at 905
    (applying the pre-AEDPA
    standard of review where initial petition was filed prior to
    SMITH V. SCHRIRO                                 7
    AEDPA’s effective date and amended petitions were filed
    following AEDPA’s enactment); Robinson v. Schriro,
    
    595 F.3d 1086
    , 1099 (9th Cir. 2010) (same); see also Lindh
    v. Murphy, 
    521 U.S. 320
    , 326 (1997) (holding that Congress
    intended AEDPA to apply “only to such cases as were filed
    after [AEDPA’s] enactment”).
    Under pre-AEDPA law, state court factual findings are
    entitled to a presumption of correctness, subject to eight
    exceptions enumerated in the previous version of 28 U.S.C.
    § 2254(d). 
    Sivak, 658 F.3d at 905
    –06. Among the exceptions
    to the rule regarding a presumption of correctness is the
    following: the state court’s “factual determination is not fairly
    supported by the record.” 28 U.S.C. § 2254(d)(8). Because
    the parties agree that whether Smith is intellectually disabled
    is a question of fact, we assume for purposes of this opinion
    that such is the case.5 The presumption of the correctness
    also does not apply if the factual determination is based on
    the application of constitutionally impermissible legal
    principles. Lafferty v. Cook, 
    949 F.2d 1546
    , 1551 n. 4 (10th
    Cir. 1991).
    5
    The Fourth and Fifth Circuits have held that the question of whether a
    person is intellectually disabled under Atkins constitutes an issue of fact.
    See Walker v. Kelly, 
    593 F.3d 319
    , 323 (4th Cir. 2010); Maldonado v.
    Thaler, 
    625 F.3d 229
    , 236 (5th Cir. 2010). The Nevada, Pennsylvania,
    and Tennessee Supreme Courts have held that the question is instead a
    mixed question of law and fact. Ybarra v. State, 
    247 P.3d 269
    , 276 (Nev.
    2011); Commonwealth v. Crawley, 
    924 A.2d 612
    , 615 (Pa. 2007); State
    v. Strode, 
    232 S.W.3d 1
    , 8 (Tenn. 2007). We have not yet decided the
    issue in our Circuit, but have held in a separate context that the question
    of intellectual disability is a mixed question of law and fact. See Gregory
    K. v. Longview Sch. Dist., 
    811 F.2d 1307
    , 1310 (9th Cir. 1987) (whether
    student was intellectually disabled, as defined by state regulations, for the
    purpose of the federal Education for All Handicapped Children Act is a
    mixed question of law and fact).
    8                         SMITH V. SCHRIRO
    B. Legal Standard Governing Determination of
    Intellectual Disability Under Arizona Law
    In 2001, one year before Atkins was decided, the Arizona
    legislature enacted a statute prohibiting the execution of
    intellectually disabled persons and creating a process by
    which capital defendants are evaluated for intellectual
    disability. Ariz. Rev. Stat. Ann. § 13-703.02 (2001), 2001
    Ariz. Sess. Laws, Ch. 260, § 2; State v. Grell (Grell I),
    
    66 P.3d 1234
    , 1240 (2003). Under the version of the statute
    in effect at the time of Smith’s Atkins hearing in 2007, the
    procedures for evaluating a defendant were automatically
    triggered upon the State’s filing a notice of intent to seek the
    death penalty. Ariz. Rev. Stat. Ann. § 13-703.02(B) (2006),
    as amended by 2006 Ariz. Sess. Laws, Ch. 55, § 1.6 The
    statute provides that the burden of proving intellectual
    disability lies with the capital defendant who must prove his
    disability by “clear and convincing evidence.” Ariz. Rev.
    Stat. Ann. § 13-703.02(G).
    The Arizona statute defines “mental retardation” as
    containing three elements: (1) “significantly subaverage
    general intellectual functioning” and (2) concurrent
    “significant impairment in adaptive behavior,” (3) “where the
    onset of the foregoing conditions occurred before the
    defendant reached the age of eighteen.” Ariz. Rev. Stat. Ann.
    § 13-703.02(K)(3). “Significantly subaverage general
    6
    Section 13-703.02 was subsequently renumbered as § 13-753. 2008
    Ariz. Sess. Laws, Ch. 301, § 26. In 2011, the statute was amended to
    substitute the term “intellectual disability” for “mental retardation.” Ariz.
    Sess. Laws 2011, Ch. 89, § 5. Unless otherwise stated, all references to
    § 13-703.02 are to the version in effect at the time of Smith’s Atkins
    evidentiary hearing.
    SMITH V. SCHRIRO                        9
    intellectual functioning” is defined as “a full scale
    intelligence quotient [IQ] of seventy or lower.” Ariz. Rev.
    Stat. Ann. § 13-703.02(K)(5). “Adaptive behavior” is defined
    as “the effectiveness or degree to which the defendant meets
    the standards of personal independence and social
    responsibility expected of the defendant’s age and cultural
    group.” Ariz. Rev. Stat. Ann. 13-703.02(K)(1).
    Under Arizona’s procedures for determining intellectual
    disability, the court appoints a prescreening psychological
    expert to determine the defendant’s IQ “using current
    community, nationally and culturally accepted intelligence
    testing procedures.” Ariz. Rev. Stat. Ann. § 13-703.02(B). If
    the expert determines that the defendant’s IQ is above 75,
    “the notice of intent to seek the death penalty shall not be
    dismissed on the ground that the defendant has mental
    retardation.” Ariz. Rev. Stat. Ann. § 13-703.02(C). If the IQ
    score is 75 or less, however, the court will appoint additional
    experts in consultation with the parties to prepare reports
    regarding whether the defendant is intellectually disabled.
    Ariz. Rev. Stat. Ann. § 13-703.02(D), (E). If at this point all
    IQ test scores are above 70, the defendant remains eligible for
    the death penalty. Ariz. Rev. Stat. Ann. § 13-703.02(F).
    If the testing demonstrates that the defendant’s IQ score
    is equal to or less than 70, however, the court holds a hearing
    at which “the defendant has the burden of proving mental
    retardation by clear and convincing evidence.” Ariz. Rev.
    Stat. Ann. § 13-703.02(G). Under Arizona law, “[c]lear and
    convincing evidence is that which may persuade that the truth
    of the contention is ‘highly probable.’” In Re Neville,
    
    708 P.2d 1297
    , 1302 (Ariz. 1985) (en banc). A determination
    by the court that the defendant’s IQ is 65 or below
    “establishes a rebuttable presumption that the defendant has
    10                    SMITH V. SCHRIRO
    mental retardation.” Ariz. Rev. Stat. Ann. § 13-703.02(G).
    However, “‘[t]he presumption of mental retardation based on
    the IQ scores vanishes . . . if the State presents evidence that
    calls into question the validity of the IQ scores or tends to
    establish that [the] defendant does not otherwise meet the
    statutory definition of mental retardation.’” State v. Boyston,
    
    298 P.3d 887
    , 895 (Ariz. 2013) (quoting State v. Arellano,
    
    143 P.3d 1015
    , 1019 (Ariz. 2006)); see 
    Arellano, 143 P.3d at 1018
    (“A rebuttable presumption, however, ‘vanishes when
    the state provides contradictory evidence.’” (citation
    omitted)). “‘At that point, the IQ scores serve as evidence of
    mental retardation, to be considered by the trial court with all
    other evidence presented.’” 
    Boyston, 298 P.3d at 895
    (quoting 
    Arellano, 143 P.3d at 1019
    ).
    Smith did not have the benefit of this procedural
    framework at the time of his trial because the trial took place
    nearly twenty years before the procedural framework’s
    adoption. The Arizona Supreme Court has held that in cases
    presenting Atkins claims in such a post-trial posture, courts
    should use Atkins as a guide and apply the pre-trial
    procedures of § 13-703.02 to the extent practical. As the
    Arizona Supreme Court explained in a capital case predating
    the passage of § 13-703.02,
    We recognize that the procedures set forth in
    section 13-703.02 are not applicable in Grell’s
    case, as section 13-703.02 did not take effect
    until after Grell’s sentencing. Moreover, the
    procedures contemplated by section 13-
    703.02 are pre-trial procedures, triggered
    when the State files its notice of intent to seek
    the death penalty. The trial court should use
    Atkins as a guide and should, insofar as is
    SMITH V. SCHRIRO                       11
    practical in the post-trial posture of this case,
    follow the procedures established in [Ariz.
    Rev. Stat.] section 13-703.02.
    Grell 
    I, 66 P.3d at 1241
    (footnote omitted); accord 
    Arellano, 143 P.3d at 1017
    (“[Ariz. Rev. Stat. § 13-703.02] applies to
    all capital sentencing proceedings, including post-conviction
    proceedings brought to determine whether a defendant meets
    the statutory definition of mental retardation.”).
    C. Presumption of Correctness
    As an initial matter, we must determine whether a
    presumption of correctness applies to the state court’s factual
    determination that Smith was not intellectually disabled at the
    time of the offense and trial. We conclude that it does not.
    As discussed in section II.C.1, we hold that the state court’s
    factual determination is not entitled to deference because it is
    “not fairly supported by the record.” 28 U.S.C. § 2254(d)(8).
    Also, as explained in section II.C.2, Judge Reinhardt would
    hold that deference is not due for the additional and
    independent reason that the Pima County Superior Court
    rendered its finding that Smith was not intellectually disabled
    under a constitutionally impermissible legal standard.
    1. The State Court’s Factual Determination Is
    Not Fairly Supported By the Record
    Our case law provides some guidance for determining
    when the exception codified at § 2254(d)(8) applies. Where
    the record is ambiguous, a state court’s factual determination
    is “fairly supported by the record” within the meaning of
    § 2254(d)(8). Palmer v. Estelle, 
    985 F.2d 456
    , 459 (9th Cir.
    1993); see Wainwright v. Goode, 
    464 U.S. 78
    , 85 (1983).
    12                       SMITH V. SCHRIRO
    Where the great majority of the evidence strongly points
    against the state court’s finding, however, the finding is not
    fairly supported. We have held that a factual determination
    is not fairly supported by the record even if it is supported by
    some evidence and other evidence is equally consistent with
    both the state court’s conclusion and a contrary conclusion,
    so long as the record as a whole “strongly suggests” a
    different conclusion. See Carriger v. Stewart, 
    132 F.3d 463
    ,
    473–76 (9th Cir. 1997).
    This standard must also be read in the context of the
    Supreme Court’s recent decision in Hall v. Florida, 
    134 S. Ct. 1986
    (2014). In Hall, the Court emphasized that, in death
    penalty cases where a defendant’s intellectual functioning is
    a close question, the defendant “must be able to present
    additional evidence of intellectual disability . . . .” 
    Id. at 2001.
    In fact, in these situations, the court must not “view a single
    factor as dispositive” given the complexity of intellectual
    disability assessments. 
    Id. Therefore, a
    court reviewing the
    whole record as required by the standard at issue must
    consider all indications of a defendant’s intellectual disability
    and may not discard relevant evidence.
    Here, we do not defer to the state court’s ultimate
    conclusion that Smith was not intellectually disabled because
    it lacks fair support in the record as a whole.7 Nor do we
    defer to the state court’s weighing of the evidence where its
    7
    The mere fact that the record contains contrary opinions by two expert
    witnesses does not render it ambiguous. Once we look behind each
    expert’s conclusion and consider the evidence on which he relies, it
    becomes clear that the great majority of the evidence strongly reinforces
    Dr. Thompson’s opinion and that Dr. Martinez’s contrary conclusion lacks
    even fair evidentiary support.
    SMITH V. SCHRIRO                               13
    decisions to discount certain evidence similarly lack fair
    evidentiary support or result from legal error.8 The evidence
    in this case overwhelmingly supports our conclusion that
    Smith satisfied both substantive prongs of intellectual
    disability—significantly subaverage general intellectual
    functioning and significant impairment in adaptive
    behavior—both prior to age eighteen and at the time of the
    crime.
    a. Application of Atkins
    The state trial court correctly concentrated its analysis on
    whether Smith was intellectually disabled at the time of the
    offense and the ensuing trial. In Atkins, the Court identified
    two rationales supporting its holding. First, concentrating on
    the time of the offense, the Court recognized that
    intellectually disabled offenders are less culpable for their
    crimes. 
    Atkins, 536 U.S. at 317
    ; see also 
    Hall, 134 S. Ct. at 1992
    –93. Specifically, the Court noted that there is reason to
    doubt whether either justification it had previously
    recognized as a basis for the death penalty—retribution and
    deterrence—applies to intellectually disabled offenders.
    
    Atkins, 536 U.S. at 318
    –19. These individuals, the Court
    explained, suffer from impairments leaving them with
    8
    When a state court’s decision to discount certain evidence constitutes
    a factual determination, we may apply § 2254(d)(8) to determine whether
    deference is due. See 
    Carriger, 132 F.3d at 473
    –76, 478 (applying
    § 2254(d)(8) to reject the state court’s ancillary factual determination that
    a witness lacked credibility and holding, based in part upon our decision
    to credit that witness’s testimony, that the petitioner had satisfied the
    Schlup “miscarriage of justice” standard); see also Schlup v. Delo,
    
    513 U.S. 298
    , 314 (1995). Where a state court’s decision to discount
    certain evidence results from legal error, the presumption of correctness
    does not apply. See 
    Sivak, 658 F.3d at 905
    .
    14                       SMITH V. SCHRIRO
    “diminished capacities to understand and process
    information, to communicate, to abstract from mistakes and
    learn from experience, to engage in logical reasoning, to
    control impulses, and to understand the reactions of others,”
    making them more likely to act on impulse rather than
    premeditation, and as followers rather than leaders. 
    Id. at 318.
    These limitations diminish the individual’s relative
    culpability for the crime, and, consequently, the retributive
    justification of the death penalty. See 
    id. at 319
    (“[T]he
    severity of the appropriate punishment necessarily depends
    on the culpability of the offender.”); see also 
    Hall, 134 S. Ct. at 1992
    (“No legitimate penological purpose is served by
    executing a person with intellectual disability.”). They
    likewise limit the death penalty’s deterrent effect, because
    these impairments “also make it less likely that [intellectually
    disabled offenders] can process the information of the
    possibility of execution as a penalty and, as a result, control
    their conduct based upon that information.” 
    Atkins, 536 U.S. at 320
    .
    The Court’s second rationale concentrates on a
    defendant’s trial in light of the heightened risk that
    “[m]entally retarded defendants in the aggregate face a
    special risk of wrongful execution” because they are less able
    to effectively participate in their own defense for the purpose
    of making “a persuasive showing of mitigation.”9 
    Id. at 320–21;
    see also 
    Hall, 134 S. Ct. at 1993
    . Because the
    9
    Because it applies equally to the time of the crime and trial, the
    constitutional right announced in Atkins is unlike the rights provided by
    Pate v. Robinson, 
    383 U.S. 375
    , 378 (1966) (right to not to be tried while
    legally incompetent), and Ford v. Wainwright, 
    477 U.S. 399
    , 409–10
    (1986) (right not to be executed while insane), which attach, respectively,
    to the time of trial and execution.
    SMITH V. SCHRIRO                             15
    rationales underlying the right announced in Atkins
    concentrate on the time the crime was committed and the
    ensuing trial, we hold that a defendant comes within the
    protection of Atkins if he can demonstrate that he was
    intellectually disabled during either of these periods.10
    Consequently, a defendant’s present condition is relevant
    only to the extent that it is probative of his condition during
    the relevant periods.
    The defendant must, of course, qualify under the third
    prong as well. The onset of the mental disability must have
    occurred before he reached the age of eighteen.
    We turn now to why the record does not fairly support the
    state court’s determination that Smith was not intellectually
    disabled. In order to do so, we must examine the evidence
    under the two substantive elements of the Arizona statute, and
    determine whether the evidence as a whole strongly points to
    the conclusion that the two statutory conditions existed at the
    time of the crime or trial, and whether the onset of each
    condition occurred prior to age eighteen.
    10
    Many states expressly recognize that Atkins applies to individuals who
    may be deemed intellectually disabled at the time the crime was
    committed or at trial. See, e.g., Smith v. State, No. 1060427, 
    2007 WL 1519869
    , at *8 (Ala. May 25, 2007); Ark. Code Ann. § 5-4-618(b); Del.
    Code Ann. tit. 11, § 4209(d)(3)(c); Ga. Code Ann. § 17-7-131(c); Pizzuto
    v. State, 
    202 P.3d 642
    , 653, 654 (Idaho 2008); Chase v. State, No. 2013-
    CA-01089-SCT, 
    2015 WL 1848126
    , at *3 (Miss. Apr. 23, 2015); S.D.
    Codified Laws § 23A-27A-26.1; Tenn. Code Ann. § 39-13-203(b); Ex
    parte Cathey, 
    451 S.W.3d 1
    , 19 (Tex. Crim. App. 2014); Wash. Rev.
    Code § 10.95.030(2).
    16                       SMITH V. SCHRIRO
    b. Significantly Subaverage                      General
    Intellectual Functioning
    “‘Significantly subaverage general intellectual
    functioning’ is the touchstone for proving [intellectual
    disability] and means ‘a full scale intelligence quotient [IQ]
    of seventy or lower.’” State v. Grell (Grell III), 
    291 P.3d 350
    , 352 (Ariz. 2013) (quoting Ariz. Rev. Stat. Ann. § 13-
    753(K)(5)).11 It must be manifested before age eighteen,
    Ariz. Rev. Stat. Ann. § 13-703.02(K)(3), and at the time of
    the crime or trial, see 
    Atkins, 536 U.S. at 317
    –21.
    1. Intellectual Functioning Prior to Age
    Eighteen
    Smith took the Otis Intelligence Scale Test in April 1964
    and again in October of that year, when he was fifteen years
    old, receiving scores of 62 and 71, respectively. The score of
    62 Smith received the first time he took the test is the more
    relevant of the two scores in light of Dr. Thompson’s
    unrebutted testimony that Smith’s second test score of 71 was
    inflated by the practice effect of having taken the same test
    just several months earlier. Dr. Thompson explained that
    under the practice effect, a person scores higher on a test
    when it is readministered within a short period of time
    because he has become familiar with the test. Arizona courts
    and the most current clinical guidelines recognize the practice
    effect. See State ex rel. Thomas v. Duncan, 
    216 P.3d 1194
    ,
    1195 n. 4 (Ariz. Ct. App. 2009) (“The practice effect occurs
    when a person performs better on a test because he or she has
    11
    The version of the statute in effect at the time of Smith’s evidentiary
    hearing uses an identical definition. Ariz. Rev. Stat. Ann. § 13-
    703.02(K)(5).
    SMITH V. SCHRIRO                        17
    taken it before.”); 
    id. at 1198
    (stating that “a defendant may
    argue that the practice effect impacted the results” of
    successive IQ tests); Am. Ass’n of Intellectual and
    Developmental Disabilities, Intellectual Disability 38 (11th
    ed. 2010) [hereinafter AAIDD 11th ed.] (describing research
    showing the artificial increase in IQ scores when the same
    instrument is readministered within a short time interval, and
    stating that established clinical practice is to avoid
    administering the same intelligence test within the same year
    to the same individual because it will often lead to an
    overestimation of the examinee’s true intelligence); Am.
    Psychiatric Ass’n, Diagnostic and Statistical Manual of
    Mental Disorders 37 (5th ed. 2013) [hereinafter DSM-V]
    (identifying the practice effect as a factor capable of affecting
    test scores).
    Under the Atkins framework Arizona later adopted,
    Smith’s IQ score of 62 would entitle him to a presumption of
    intellectual disability. See Ariz. Rev. Stat. Ann. § 13-
    703.02(G). The State, however, “present[ed] evidence that
    calls into question the validity of the IQ scores or tends to
    establish that [the] defendant does not otherwise meet the
    statutory definition of mental retardation.” 
    Boyston, 298 P.3d at 895
    (quoting 
    Arellano, 143 P.3d at 1019
    ). Specifically, the
    State points to the results of IQ test scores administered by
    Drs. Thompson and Martinez in 2005 and 2007, on which
    Smith received scores of 89, 91, and 93. These scores
    demonstrate that Smith is not presently intellectually
    disabled, and, in the absence of IQ scores documenting
    Smith’s IQ at the time the crime was committed, raise an
    18                        SMITH V. SCHRIRO
    inference that he may not have been disabled at that time.12
    Accordingly, “[t]he presumption . . . based on the IQ scores
    vanishes” and we weigh the evidence as if no presumption
    had existed. Id. (quoting 
    Arellano, 143 P.3d at 1019
    )).13
    In any event, the Otis test scores remain highly probative
    of Smith’s condition prior to age eighteen. The State asserts
    that the tests are unreliable, and points to Dr. Thompson’s
    testimony on cross-examination that by 1964 the Otis tests
    had not been “normed” against the current population for
    forty years, and that he had not seen the raw data from
    Smith’s Otis tests or any information regarding the conditions
    under which those tests were administered. Although the lack
    of contemporary norming may call into some question the
    accuracy of the test results, Dr. Thompson gave
    uncontroverted testimony that, due to the Flynn Effect, this
    would only have caused Smith’s scores to be overstated. The
    basic premise of the Flynn effect is that because average IQ
    scores increase over time, a person who takes an IQ test that
    12
    Given the substantial time between the commission of the crime and
    the IQ tests administered by Drs. Thompson and Martinez, this inference
    is not particularly strong. Moreover, as discussed below, substantial
    evidence demonstrates that Smith’s IQ did in fact fall below the threshold
    necessary to demonstrate significantly subaverage general intellectual
    functioning at the time the crime was committed.
    13
    While the standard for overcoming the statutory presumption of
    intellectual disability is not particularly clear, the general rule in Arizona
    suggests it is low. Cf. State v. Lewis, 
    340 P.3d 415
    , 420 (Ariz. Ct. App.
    2014) (“[A]s with other rebuttable presumptions, the presumption of
    continued incompetence ‘disappears entirely upon the introduction of any
    contradicting evidence and when such evidence is introduced the existence
    or non-existence of the presumed [incompetence] is to be determined
    exactly as if no presumption had ever been operative.’” (quoting Sheehan
    v. Pima Cnty., 
    660 P.2d 486
    , 489 (Ariz. Ct. App. 1982))).
    SMITH V. SCHRIRO                              19
    has not recently been normed against a representative sample
    of the population will receive an artificially inflated IQ score.
    See James R. Flynn, Tethering the Elephant: Capital Cases,
    IQ, and the Flynn Effect, 12 Psychol. Pub. Pol'y & L. 170,
    173 (2006) [hereinafter Flynn Effect]. This is because IQ
    scores are based on a normal distribution curve, and thus an
    individual’s score is meaningful only in relation to the scores
    of the other people who took the same test. See J.C. Oleson,
    The Insanity of Genius: Criminal Culpability and Right–Tail
    Psychometrics, 16 Geo. Mason L. Rev. 587, 598 (2009).
    When correcting for the Flynn Effect, “[t]he standard practice
    is to deduct 0.3 IQ points per year (3 points per decade) to
    cover the period between the year the test was normed and
    the year in which the subject took the test.” Flynn 
    Effect, supra, at 173
    . The AAIDD recognizes the existence of the
    Flynn Effect and recommends correcting for the age of norms
    in outdated tests. AAIDD 11th 
    ed., supra, at 37
    ; see also Am.
    Ass’n on Mental Retardation, Mental Retardation: Definition,
    Classification, and Systems of Supports 56 (10th ed. 2002)
    [hereinafter AAMR 10th ed.]. The Fourth and Eleventh
    Circuits have also recognized the existence of the Flynn
    Effect. See Walker v. True, 
    399 F.3d 315
    , 322–23 (4th Cir.
    2005) (reversing district court due to its failure to consider
    “relevant evidence” of the Flynn effect); Holladay v. Allen,
    
    555 F.3d 1346
    , 1358 (11th Cir. 2009) (“[A]ll of the scores
    were on WAIS tests, which may have reflected elevated
    scores because of the Flynn effect.”).14 Without referring to
    14
    Courts have taken a range of approaches with regard to the Flynn
    effect. Some courts have gone beyond the Fourth and Eleventh Circuits
    by mandating its application to defendants’ IQ scores. See Thomas v.
    Allen, 
    614 F. Supp. 2d 1257
    , 1281 (N.D. Ala. 2009) (“A court must also
    consider the Flynn effect and the standard error of measurement in
    determining whether a petitioner’s IQ score falls within a range containing
    scores that are less than 70.”); United States v. Parker, 
    65 M.J. 626
    , 629
    20                        SMITH V. SCHRIRO
    the Flynn effect by name, we too have adjusted IQ scores
    based on out-of-date norms. Gregory 
    K., 811 F.2d at 1312
    n.
    2. Here, we conclude that, in light of Dr. Thompson’s
    uncontroverted testimony regarding the impact of the Flynn
    Effect, Smith’s score of 62 on the outdated Otis test renders
    it highly probable that his IQ at the time of the test was lower
    than 62, well below the cutoff for demonstrating
    “significantly subaverage general intellectual functioning”
    under Arizona law.
    The record does not fairly support the state court’s
    determination to afford the Otis test little weight and discount
    Dr. Thompson’s opinion to the extent that he relied on the
    (N-M. Ct. Crim. App. 2007); People v. Superior Court, 
    28 Cal. Rptr. 3d 529
    , 558-559 (Cal. Ct. App. 2005), overruled on other grounds (“In
    determining [a petitioner’s] IQ score, consideration must be given to the
    so-called Flynn effect”). Other courts have left to the trial court’s
    discretion whether to apply the Flynn Effect. See State v. Burke, No.
    04AP-1234, 
    2005 WL 3557641
    , at *13 (Ohio Ct. App. Dec. 30, 2005)
    (“We conclude that a trial court must consider evidence presented on the
    Flynn effect, but, consistent with its prerogative to determine the
    persuasiveness of the evidence, the trial court is not bound to, but may,
    conclude the Flynn effect is a factor in a defendant’s IQ score.”). Still
    other courts have rejected use of the Flynn Effect. See Bowling v.
    Commonwealth, 
    163 S.W.3d 361
    (Ky. 2005) (neither the Flynn effect nor
    standard margins of error properly are considered); Howell v. State,
    
    151 S.W.3d 450
    , 458 (Tenn. 2004); Neal v. State, 
    256 S.W.3d 264
    , 273
    (Tex. Crim. App. 2008) (“We have previously refrained from applying the
    Flynn effect, however, noting that it is an ‘unexamined scientific concept’
    that does not provide a reliable basis for concluding that an appellant has
    significant sub-average general intellectual functioning.”); In re Mathis,
    
    483 F.3d 395
    , 398 n. 1 (5th Cir. 2007) (“The Flynn Effect . . . has not been
    accepted in this Circuit as scientifically valid.”).
    SMITH V. SCHRIRO                             21
    test.15 Although Dr. Thompson and Dr. Martinez each noted
    that additional information regarding the administration of the
    test would enhance its validity, neither witness concluded that
    the test results were invalid in the absence of such
    information. More fundamentally, we decline to disregard
    the Otis tests on the basis that Smith is unable to proffer the
    same level of detailed evidence regarding their administration
    as is available for recent tests administered by court-
    appointed psychologists. Like most states, Arizona places the
    burden on a defendant raising an Atkins claim to demonstrate,
    inter alia, significantly subaverage general intellectual
    functioning [meaning an IQ of 70 or below] occurring before
    the age of eighteen. Ariz. Rev. Stat. Ann. § 13-703.02(K)(3),
    (5). It is highly unlikely, however, that the people
    administering an IQ test to a child would ever anticipate the
    use of that test in an Atkins proceeding, and at the time of
    Smith’s tests the constitutional right provided by Atkins did
    not even exist. Consequently, records of childhood IQ tests
    will rarely include the detailed information collected for IQ
    tests administered under court supervision to adjudicate a
    defendant’s Atkins claim. To discount what may be the only
    evidence of subaverage general intellectual functioning prior
    to age eighteen on this ground would effectively deny the
    protection afforded by Atkins to individuals who are
    substantially older than eighteen years old, or whose trials
    predate Atkins, because it would render their intellectual
    disability nearly impossible to prove. Given the evidentiary
    15
    The state court also noted that expert testimony regarding Quantitative
    Electronencephalography (QEEG) testing on Smith, which it held
    inadmissible, played a role in Dr. Thompson’s opinion that Smith’s
    functional limitations were related to his frontal lobe dysfunction.
    Because testimony regarding the QEEG testing played a non-essential and
    limited role in Dr. Thompson’s conclusion, his opinion cannot be
    discounted on this basis.
    22                    SMITH V. SCHRIRO
    challenges so often arising from the retrospective nature of
    Atkins claims, the Eighth Amendment requires that courts
    apply a more relaxed standard when determining the
    reliability of evidence documenting childhood onset of
    intellectual disability. Here, there is no indication that Smith
    was malingering when he took the Otis tests. Accordingly,
    although they do not provide a presumption of intellectual
    disability under Arizona law, we find that Smith’s first Otis
    test score nonetheless “serve[s] as evidence of mental
    retardation, to be considered by [this] [C]ourt with all other
    evidence presented.’” 
    Boyston, 298 P.3d at 895
    (internal
    quotation marks omitted).
    We hold the first Otis test score reliable for the additional
    reason that it is consistent with Smith’s contemporaneous
    poor academic performance. Under Arizona law, evidence of
    poor academic performance is evidence of subaverage
    intellectual functioning. Williams v. Cahill ex rel. Cnty. of
    Pima, 
    303 P.3d 532
    , 540 (Ariz. Ct. App. 2013) (“[W]hen no
    childhood IQ tests were performed, subaverage intellectual
    functioning before the age of eighteen properly may be
    inferred from other evidence of intellectual functioning, such
    as school performance.”).              Here, the evidence
    overwhelmingly demonstrates that Smith performed
    exceedingly poorly in school, scoring in the 2nd to 5th
    percentiles on the Stanford Achievement Test at age fifteen,
    placing him five to seven years below his age level and three
    to five years below grade level. Smith’s school transcripts
    reveal that he received nearly all “Ds” and “F’s” in his
    academic subjects, and that his education did not progress
    beyond the eighth grade, after which he dropped out of
    school. The State does not contest the validity of these
    records. Melva Jane Box, Smith’s older sister, testified that
    Smith was held back in all his grades, was placed in special
    SMITH V. SCHRIRO                       23
    education class for slow learners, and was even transferred to
    a special school “because he couldn’t learn.” Charles
    Caperton, one of Smith’s childhood neighbors, similarly
    testified that Smith was placed in special education classes.
    Taken together, Smith’s Otis test scores and poor academic
    performance overwhelmingly demonstrate that Smith
    experienced significantly subaverage general intellectual
    functioning prior to the age of eighteen. The state court’s
    determination to the contrary does not find fair support in the
    record.
    2. Intellectual Functioning at the Time of
    the Crime and Trial
    The more fundamental question in this case is whether
    Smith continued to suffer from subaverage intellectual
    functioning at the time of the crime and trial. The only
    evidence to the contrary is the IQ test scores conducted by Dr.
    Thompson and Dr. Martinez decades after the trial. Thus, the
    question is the relative weight that can fairly be given to the
    pre-crime and post-crime test scores insofar as they provide
    evidence determinative of Smith’s intellectual functioning at
    the time of the crime and trial, and whether the record fairly
    supports the state court’s conclusion that Smith did not
    experience significantly subaverage general intellectual
    functioning at that crucial time.
    We begin by noting that the subsequent administration of
    IQ tests by Drs. Thompson and Martinez was substantially
    more remote from the period of Smith’s crime than the
    administration of the Otis test scores: twenty-five and twenty-
    seven years after the crime, in the former case, compared to
    sixteen years in the latter. Accepting each set of test scores
    as valid measures of Smith’s IQ at the time the tests were
    24                    SMITH V. SCHRIRO
    administered, this discrepancy renders more probable Smith’s
    assertion that his IQ at the time of the crime approximated the
    IQ reflected in his first Otis test score rather than his more
    recent, higher scores.
    The key issue, however, is the strength of Smith’s
    evidence demonstrating the probability that his significant
    gains in IQ score occurred after, rather than before, his
    incarceration. Dr. Thompson testified that improvements in
    IQ score similar to those attained by Smith are possible for
    individuals like Smith whose cognitive problems stem from
    environmental factors rather than physical injury and who are
    later given appropriate antidepressant medication and placed
    in a structured environment. Certainly, Smith adduced
    substantial evidence of a horribly abusive and impoverished
    upbringing supporting Dr. Thompson’s opinion: he was
    routinely brutalized by his stepfather, and was subjected to
    extreme verbal and emotional abuse by his mother,
    interspersed with neglect and periods of outright
    abandonment. According to Box, Smith’s stepfather would
    beat him with “whatever was closest . . . . a belt, a stick, a
    coat hangar,” and also molested him. Martha Gau, Smith’s
    younger half-sister, similarly testified that Smith’s stepfather
    would tell him “he was good for nothing and would never
    amount to anything,” and would kick him and whip him with
    both ends of a belt; she recalled finding Smith’s bedsheets
    covered in blood following one particularly serious beating
    when he was about twelve or thirteen years old. Caperton
    saw Smith beaten with a belt “pretty regularly,” and
    witnessed one beating involving use of a two-by-four.
    Smith’s mother frequently left the children alone at a time
    when Smith was still young enough to be using a high chair.
    On one occasion when she was actually present, Smith’s
    mother engaged in extra-marital foreplay in the front seat of
    SMITH V. SCHRIRO                               25
    her car while Smith sat in the backseat. On another, after the
    children failed to adequately clean the dishes, she sent them
    outside with bowls on their heads to pick weeds from the yard
    while other children from the neighborhood gathered around
    them and laughed. As a result of this upbringing, Dr.
    Thompson opined, Smith became intellectually disabled with
    frontal lobe abnormalities.16
    As evidence that IQ scores can improve following the
    commission of the crime in situations similar to Smith’s, Dr.
    Thompson cited robust data demonstrating that the use of
    antidepressants (which Smith took while incarcerated) can
    significantly increase brain functioning over time, noted that
    other death row inmates have attained improved functioning
    while incarcerated, and provided an anecdote of a patient who
    achieved a twelve point gain in IQ score after receiving
    medication for just four months. As evidence that his level of
    16
    The state court committed legal error when it discounted Dr.
    Thompson’s opinion that Smith’s abusive upbringing contributed to his
    intellectual disability, which was manifested by poor test scores and
    grades, and instead adopted the state’s theory that Smith’s abusive
    upbringing itself caused his poor academic performance but that he was
    not intellectually disabled. The state’s theory misapprehends Arizona’s
    definition of intellectual disability, which centers on indicators such as
    low IQ scores and impaired adaptive behavior and not the purported
    etiology of these indicators. See Ariz. Rev. Stat. Ann. § 13-703.02(K)(1),
    (3), (5). Simply stated, while the specific cause of intellectual disability
    is significant with regard to whether the condition is static or mutable, the
    threshold question whether an individual is intellectually disabled is
    answered simply by the presence of impaired functioning regardless of its
    purported cause. See AAIDD 11th 
    ed., supra, at 59
    –61 (describing
    intellectual disability as arising from cultural-familial factors, biological
    factors, or a combination of the two, and stating that “[b]ecause
    [intellectual disability] is characterized by impaired functioning, its
    etiology is whatever caused this impairment in functioning.”).
    26                    SMITH V. SCHRIRO
    functioning improved over the course of his incarceration,
    Smith adduced testimony from multiple witnesses describing
    dramatic improvements in the quality of the letters he sent
    from prison. Gau testified that letters Smith sent her at the
    beginning of his incarceration were virtually unintelligible,
    but that over the following years his writing had improved
    “100 percent,” explaining that “it was like a totally different
    person was writing it.” Martha Hight, Smith’s aunt by
    marriage, similarly described Smith’s early letters from
    prison as partially unintelligible, and noted improvements in
    the letters he sent in later years. Smith also received tutoring
    while in prison. Ronald Labrecque, who worked for the
    Department of Corrections from 1986 until 1997, supervised
    Smith’s work on maintenance jobs over an eight year period.
    Labrecque also tutored Smith, helping him with his reading
    and providing him reading materials such as working
    manuals, and described witnessing a “vast improvement” in
    Smith’s reading ability over this time. Smith received
    additional help from Ed Schad, a fellow inmate, who would
    get books for Smith from the prison library and have him read
    them. None of this evidence is refuted by the State.
    For his part, although disagreeing with Dr. Thompson’s
    ultimate conclusion, Dr. Martinez agreed with several of his
    key premises. Dr. Martinez testified that significant IQ gains
    are possible, and acknowledged that Smith’s IQ gains were
    not without precedent. He also agreed with Dr. Thompson’s
    characterization of prison as a “structured environment.”
    More significant, Dr. Martinez testified that improved
    functioning is unlikely to occur in the absence of training and
    educational opportunities (which Smith received in prison
    from Labrecque and Schad), and stated that there was no
    indication Smith received any such opportunities prior to the
    time of the crime. This strongly reinforces, and renders
    SMITH V. SCHRIRO                       27
    highly probable, Smith’s assertion that the improvement in
    his functioning did not occur until after the crime was
    committed. For all of these reasons, we hold that the state
    court’s determination that no evidence explains whether the
    finding of Smith’s low childhood IQ could be extrapolated to
    the time of the crime and trial lacks even fair support in the
    record.
    Dr. Martinez also relied on reports summarizing three
    Rule 11 competency evaluations Smith underwent in 1981,
    each of which found Smith competent to stand trial. He
    specifically cited the conclusion of one evaluator, Dr.
    LaWall, that Smith “probably functions in the average range
    of intelligence.” Dr. Thompson described the Rule 11 reports
    as an unreliable assessment of intelligence because they are
    “very superficial,” and “very subjective.” He explained that
    because the reports focus on competency, they comprise
    estimates of a subject’s functioning based only on a brief
    interview, involve little review of the subject’s history,
    and—more important—include no quantitative assessment of
    his IQ. Dr. Thompson’s critique is consistent with Arizona
    law and highly persuasive, and Dr. LaWall’s assessment of
    Smith’s intelligence carries little weight. See Ariz. Rev. Stat.
    Ann. § 13-703.02(K)(5) (determining whether an individual
    suffers from significantly subaverage general intellectual
    functioning requires a quantitative assessment of IQ). The
    State adduces no other evidence of improved academic
    performance or other indicia of increased intellectual
    functioning prior to the commission of the crime.
    Accordingly, viewing the record as a whole, we hold that Dr.
    Martinez’s conclusion is not fairly supported by the record.
    Because the remaining evidence supporting the state court’s
    conclusion is minimal, we hold that its conclusion that Smith
    failed to satisfy the intellectual functioning prong of
    28                         SMITH V. SCHRIRO
    Arizona’s intellectual disability definition at the of the crime
    and/or trial is not fairly supported by the record. We hold
    instead that the evidence overwhelmingly demonstrates that
    Smith experienced significantly subaverage general
    intellectual functioning at that dispositive time.17
    17
    The State’s citation to cases describing intellectual disability as a
    static condition does not alter our conclusion, Heller v. Doe, 
    509 U.S. 312
    ,
    323 (1993); Moormann v. Schriro, 
    672 F.3d 644
    , 649 (9th Cir. 2012);
    State v. Arellano, 
    143 P.3d 1015
    , 1020 (Ariz. 2006). Moorman and
    Arellano each rely on Heller, which cites a 1985 report for the proposition
    that intellectual disability “is a permanent, relatively static condition.”
    
    Heller, 509 U.S. at 323
    (citing Samuel J. Brakel et al., The Mentally
    Disabled and the Law 37 (3d ed. 1985)). Thus, all of this case law relies
    on a single study that substantially predates developments in the clinical
    understanding of intellectual disability as a fluid condition subject to
    change. See Am. Ass’n on Mental Retardation, Mental Retardation:
    Definition, Classification, and Systems of Supports 1, 5 (9th ed. 1992)
    [hereinafter AAMR 9th ed.] (“With appropriate supports over a sustained
    period, the life functioning of the person with mental retardation will
    generally improve.”); 
    id. at 18
    (“Mental retardation begins prior to age 18
    but may not be of lifelong duration.”); Am. Psychiatric Ass’n, Diagnostic
    and Statistical Manual of Mental Disorders 47 (4th ed. 2000) [hereinafter
    DSM-IV] (“Mental Retardation is not necessarily a lifelong disorder.
    Individuals who had Mild Mental Retardation earlier in their lives
    manifested by failure in academic learning tasks may, with appropriate
    training and opportunities, develop good adaptive skills in other domains
    and may no longer have the level of impairment required for a diagnosis
    of Mental Retardation.”); AAIDD 11th 
    ed., supra, at xiii
    (“ID is no longer
    considered entirely an absolute, invariant trait of the person.”). This
    contemporary clinical understanding necessarily informs the law on
    intellectual disability. See Hall v. Florida, 
    134 S. Ct. 1986
    , 1993 (2014)
    (stating that legal definitions of intellectual disability “are informed by the
    work of medical experts”). In addition, unlike the record in this case,
    none of the cases on which the State relies involves an evidentiary record
    containing extensive expert testimony describing intellectual disability as
    a condition that is neither fixed nor static where (as in Smith’s case) it is
    influenced by environmental factors rather than an underlying medical
    condition.
    SMITH V. SCHRIRO                        29
    Moreover, to hold otherwise would contravene the
    fundamental principles the Supreme Court recently laid out
    for the benefit of the federal courts and the state judiciary in
    the landmark case of Hall v. Florida, 
    134 S. Ct. 1986
    (2014).
    In that case, the Court made it clear that a determination of
    intellectual disability requires, at least in questionable cases,
    the consideration of significant relevant evidence, not simply
    a measurement of an IQ test at a particular point in time.
    Here, the premise on which the state court’s decision as to
    intellectual disability is based is that the IQ tests taken at a
    critical time–the time prior to Smith’s 18th year–must be
    discounted in large part because, at the time they were taken,
    the procedures used for such tests were not adequately
    recorded and the information regarding the administration of
    such tests was no longer available. This test evidence was not
    only critical to the initial IQ determination when Smith was
    15 but also to the ultimate determination of his intellectual
    disability at the time of the crimes. To discount the reliability
    of the tests on such grounds is little different from failing to
    consider, or excluding, crucial evidence that is not only
    highly relevant to the principal questions at issue but is
    indeed critical to arriving at a fair and just answer to the
    question whether Smith is eligible for capital punishment.
    Hall reminds us that “the death penalty is the gravest
    sentence our society may 
    impose,” 134 S. Ct. at 2001
    , and
    that imposing this “harshest of punishments on an
    intellectually disabled person violates his or her inherent
    dignity as a human being,” 
    id. at 1992.
    Given these stakes,
    Hall warns that we must not make judgments in haste as to
    whether a person has an intellectual disability, but rather must
    consider all the “substantial and weighty evidence” in cases
    that present close questions. 
    Id. at 1994.
    Put differently, we
    cannot risk making the protections of Atkins a nullity by
    30                       SMITH V. SCHRIRO
    executing a person with an intellectual disability without
    giving him the “fair opportunity to show the Constitution
    prohibits [his] execution.” 
    Id. at 2001.
    The state court’s
    decision in Smith’s case takes that risk. By discounting
    Smith’s early IQ tests even though they were the type used at
    the time and even though they are the most likely evidence
    that an intellectually disabled defendant of Smith’s age could
    present in order to prove his condition, the state court judge
    rendered the protection for the intellectually disabled
    established by Atkins effectively meaningless, which is
    precisely what the Court sought to avoid in Hall. Such a
    decision, by removing highly probative evidence of a
    person’s intellectual disability in a death-penalty case, not
    only violates the individual defendant’s right but also
    “contravenes our Nation’s commitment to dignity and its duty
    to teach human decency as the mark of a civilized world.” 
    Id. c. Significantly
    Impaired Adaptive Behavior
    “‘Adaptive behavior’ means the effectiveness or degree
    to which the defendant meets the standards of personal
    independence and social responsibility expected of the
    defendant's age and cultural group.” Ariz. Rev. Stat. Ann.
    § 13-703.02(K)(1). Courts applying this prong must conduct
    “an overall assessment of the defendant’s ability to meet
    society’s expectations of him.”18 State v. Grell (“Grell II”),
    18
    Although state courts generally construed Atkins as imposing no
    binding definition of impaired adaptive behavior, the Supreme Court held
    in Hall that states must comply with elements of the clinical definition
    about which there exists a national 
    consensus. 134 S. Ct. at 1998
    –99.
    Because Arizona’s definition of adaptive behavior is far more restrictive
    than the clinical definition, 
    Williams, 303 P.3d at 548
    (Eckerstrom, P.J.,
    dissenting), and because a national consensus exists with regard to this
    aspect of the clinical definition, see Concurring Opinion of Reinhardt, J.,
    SMITH V. SCHRIRO                              31
    
    135 P.3d 696
    , 709 (Ariz. 2006) (en banc); accord 
    Boyston, 298 P.3d at 895
    .
    Although there is scant case law applying this prong, we
    find the Arizona Supreme Court’s decision in Grell III,
    
    291 P.3d 350
    (Ariz. 2013), highly instructive. In Grell III,
    the State stipulated that the capital defendant demonstrated
    significantly subaverage general intellectual functioning but
    contested the impairment of his adaptive behavior. 
    Id. at 352.
    Independently reviewing the evidentiary record, the court
    proceeded to hold that Grell had also demonstrated significant
    deficits in adaptive behavior, and reduced his death sentence
    to natural life. 
    Id. at 351,
    357.19 As evidence of significantly
    Arizona’s definition may well be violative of the rules established in Hall,
    and unconstitutional for that reason. Because Hall was not decided until
    after the state court had rendered its decision denying Smith’s Atkins
    claim, however, Smith had no opportunity to make this argument before
    the state court and the state had no opportunity to respond. In such
    circumstance, we might remand to allow the state court to consider the
    more recent Supreme Court decision, although we express no view on that
    question. Here, however, we need not apply Hall in light of our
    conclusion that Smith clearly satisfies even Arizona’s more onerous
    standard.
    19
    Due to the unique procedural posture of the case, the Grell III court
    applied
    Ariz. Rev. Stat. Ann. § 13-751(C). Under this statute, a defendant may
    present evidence at the penalty phase of mitigating circumstances, which
    must be proven by a preponderance of the evidence. We note that the
    Grell III court applied a lower standard of proof than governs Smith’s
    claim, but nonetheless regard the case as a useful guidepost demonstrating
    the Arizona Supreme Court’s approach to the adaptive behavior prong.
    Grell III contains the Court’s most extended analysis on this element and
    identifies numerous attributes supporting a finding of significantly
    impaired adaptive behavior.
    32                   SMITH V. SCHRIRO
    impaired adaptive behavior, the court considered, inter alia,
    Grell’s grade school records showing that he had been placed
    in special education classes; lay witness testimony describing
    him as highly impulsive, unable to understand social cues of
    children his own age, and largely unable to use the few social
    skills that he had; expert testimony describing Grell’s
    tendency to act more like children several years younger, and
    noting his impulsiveness and poor communication skills; and
    testimony from teachers and administrators who observed
    that Grell was impulsive, inattentive, and unable to
    communicate effectively. 
    Id. at 353–55.
    Grell also adduced
    testimony from members of the special education team at his
    elementary school stating their conclusion that Grell was
    intellectually disabled. 
    Id. at 353.
    A psychologist opined that
    the consistency of Grell’s poor social functioning and
    behavioral problems demonstrated the presence of intellectual
    disability, because problems arising solely from antisocial or
    personality disorders would vary over time. 
    Id. at 354.
    Grell
    also presented the expert testimony of an educational
    psychologist who concluded that
    [g]iven the facts of [Grell’s] low intellectual
    functioning, his inability to learn from his
    mistakes, his reduced capacity in
    communication, socialization and self-help
    skills, and his significant history of special
    education, followed by failure and dropping
    out of school and, in the absence of significant
    parental support and guidance, his subsequent
    serious entanglement with the criminal justice
    system, it is clear at this point that Shawn
    Grell is a person who has mental retardation.
    SMITH V. SCHRIRO                       33
    
    Id. at 355.
    The court additionally noted Grell’s history of
    running away from home, committing crimes, his inability to
    hold jobs, and his general immaturity. 
    Id. at 356.
    Reviewing
    this evidence, the court concluded that Grell had
    demonstrated significant deficits in adaptive behavior,
    notwithstanding evidence of his limited ability to adapt. 
    Id. at 357.
    The record in this case paints a remarkably similar picture
    of Smith, demonstrating consistent traits, beginning in
    childhood and continuing through the time of the crime, that
    the Grell III court held established impaired adaptive
    behavior. See 
    id. at 354
    (consistency of behavioral problems
    indicates a root cause of intellectual disability, rather than
    antisocial or personality disorders). Like Grell, Smith had a
    “significant history of special education, followed by failure
    and dropping out of school.” See 
    id. at 355.
    Specifically,
    Smith was held back in all his grades, placed in special
    education classes, subsequently transferred to a special school
    for children unable to learn, and dropped out after the eighth
    grade, by which time he was already sixteen years old. These
    facts are consistent with other testimony providing further
    evidence of Smith’s poor intellectual functioning during his
    childhood. Box testified that as a child, Smith had trouble
    learning and struggled to grasp the rules even of simple
    children’s games like tag and marbles. Betty Ruth Knight,
    another former neighbor and the mother of Smith’s fifth wife,
    Beth Lewis, stated that as a child Smith “always looked like
    he was just lost.”
    Smith had poor social skills. According to Delores Elaine
    Long, one of Smith’s childhood neighbors, as a child Smith
    was unable to interact with, play with, or carry on a
    conversation with other children. See Grell 
    III, 291 P.3d at 34
                       SMITH V. SCHRIRO
    353 (“[Grell] could not understand social cues that children
    his age should understand, and was largely unable to use the
    few social skills that he had.”). Hight testified that as a young
    adult Smith lacked any social life, and Gerald Lambright, the
    cousin of Smith’s co-defendant Joe Lambright, described
    Smith as a “loner.” Other evidence reveals Smith’s
    impulsiveness. Smith’s mother reported that psychiatrists
    who treated him during his childhood concluded Smith had
    problems with impulsiveness, which would likely continue
    throughout his life. The presentence report also describes
    Smith’s impulsiveness, stating that he “responds to external,
    social stimuli on a very concrete level, living basically from
    day to day and acting on impulse to a great degree.” See 
    id. at 353–55
    (noting Grell’s impulsiveness); 
    Atkins, 536 U.S. at 318
    (stating that intellectually disabled people “often act on
    impulse rather than pursuant to a premeditated plan”).
    Smith’s communication skills were similarly stunted.
    Hight testified that, as an adult, Smith had difficulty forming
    sentences and correctly pronouncing words; for example, he
    would say “weekie days” when referring to “weekdays.” Gau
    and Hight each described receiving nearly incomprehensible
    letters from Smith during the early period of his
    incarceration. See Grell 
    III, 291 P.3d at 354
    –55 (stating that
    Grell was “unable to communicate effectively” and noting
    “his reduced capacity in communication”).
    As in Grell III, a lay witness familiar with intellectual
    disability concluded that Smith was intellectually disabled.
    Here, Hight stated that she believed Smith to be intellectually
    disabled, based on her comparison of Smith to her own
    intellectually disabled sister. See 
    id. at 353
    (Grell identified
    as intellectually disabled by special education staff
    experienced with other disabled children). Although she was
    SMITH V. SCHRIRO                       35
    not an expert, Hight’s testimony, based on her personal
    experience, is highly probative of Smith’s adaptive behavior.
    See 
    Arellano, 143 P.3d at 1020
    (discussing the relevance of
    lay witness testimony regarding adaptive behavior).
    Other evidence indicates that Smith did not possess the
    skills necessary to take care of his own needs. Hight
    described Smith as lacking basic hygiene, unable to sit at the
    table or eat properly, and unable to take care of himself
    without assistance. Labrecque testified that he was forced to
    reprimand Smith on one occasion over his sloppiness, body
    odor, and infrequent bathing. See Grell 
    III, 291 P.3d at 355
    (“Dr. Keyes’ investigation revealed that Grell’s family
    viewed Grell as ‘somewhat incapable of caring for many of
    his own needs . . . .’ He concluded that Grell’s record
    confirmed his adaptive deficits, as illustrated by his lifelong
    inability ‘to conform his behavior to the expected standards
    of his social and same aged peers.’”).
    The evidence in this case includes many additional
    parallels to the evidence presented in Grell. Smith tormented
    his younger half-sister, sexually abusing her at a young age:
    when he was twelve, Smith was severely punished after
    persuading Gau to play “doctor” when she was five years old,
    and when Gau was nine Smith, then sixteen, brought her out
    to the garage and forced her to perform oral sex on him.
    Smith made repeated attempts to run away from home after
    which he was jailed for vagrancy. He frequently got into
    trouble for criminal activity, including numerous arrests.
    Hight testified that Smith was unable to hold a job, which she
    attributed to his inability to “comprehend what a normal
    person . . . would be able to interpret.” The record reveals
    that Smith cycled through more than 100 short-term jobs over
    a period of sixteen years, which Dr. Thompson described as
    36                        SMITH V. SCHRIRO
    evidence of multiple adaptive impairments.20 Smith also
    functioned very immaturely as an adult. Long testified that
    Smith got along well with the children of Beth Lewis,
    Smith’s fifth wife, because he related to them as a child rather
    than as an adult: “[H]e was a lot mentality [sic] like they
    were. I mean, like instead of being a dad figure, he was kind
    of like they were.” Gerald Lambright testified that, as an
    adult, Smith was immature, had difficulty interacting with
    adults his own age, would frequently mimic Donald Duck
    when he spoke at all, and preferred to interact with children.21
    Labrecque characterized Smith’s emotional maturity as
    resembling that of a twelve to fourteen year-old even a
    number of years after he had committed the crimes. Multiple
    medical records appended to Smith’s presentence report
    describe Smith in his late teens and early twenties as
    possessing an “immature personality” and exhibiting
    “immature behavior.” As the Grell III court found, this
    behavior indicates significant impairment in adaptive
    behavior under Arizona law. See 
    id. at 356–57
    (stating that
    tormenting other children, running away from home,
    committing crimes, an inability to hold jobs, and immaturity
    are among the elements of a mental history that “by itself,
    provides strong evidence that [an individual] suffered a
    ‘significant impairment’ in the ability to ‘meet[ ] the
    standards of personal independence and social responsibility
    expected’ of him.” (quoting Ariz. Rev. Stat. Ann. § 13-
    753(K)(1), (3))).
    20
    Dr. Martinez attributed Smith’s inability to hold jobs in part to Smith’s
    impulsivity, itself an indicator of impaired adaptive behavior. See Grell
    
    III, 291 P.3d at 353
    –55; 
    Atkins, 536 U.S. at 318
    .
    21
    The presentence report lists “Duck” and “Crazy Duck” as aliases for
    Smith.
    SMITH V. SCHRIRO                              37
    Additional evidence of Smith’s impaired adaptive
    behavior not present in Grell makes Smith’s impaired
    adaptive behavior even clearer. Charles McCarver, who lived
    in Smith’s apartment complex and worked with Smith
    repossessing cars, gave testimony describing an incident in
    which McCarver’s ex-girlfriend Penny jokingly told Smith
    that he could “have” their son because Smith and his wife
    were having difficulty conceiving their own child. Following
    this conversation, Smith called McCarver to say that Penny
    had told him he could have McCarver’s son. McCarver
    adamantly refused. Undeterred, Smith showed up at
    McCarver’s home expecting to take the boy, changing his
    mind only after seeing how happy the child was with
    McCarver.       Smith’s absurdly literal interpretation of
    McCarver’s joke that he would “give” Smith his son vividly
    demonstrates Smith’s malformed social and communication
    skills and his general inability to navigate his social world.22
    22
    The record does not fairly support the state court’s decision to
    discount Hight’s testimony that Smith resembled her intellectually
    disabled sister on the sole ground that it was inconsistent with testimony
    by McCarver and a second lay witness, Sidney LeBlanc, who lived in
    Smith’s apartment building and drove trucks for the same company as
    Smith. We credit Hight’s testimony because, among these witnesses, only
    she had firsthand experience with someone diagnosed with intellectual
    disability. See 
    Grell, 291 P.3d at 353
    ; 
    Arellano, 143 P.3d at 1020
    . More
    important, testimony by McCarver and LeBlanc does not contradict
    Hight’s assessment of Smith as intellectually disabled. McCarver’s
    testimony, as recounted above, strongly reinforces the conclusion that
    Smith was intellectually disabled. LeBlanc’s explanation that he and
    Smith held a large number of short-term jobs as a result of their “footloose
    and fancy free” transient lifestyle, is at least as suggestive of traits
    indicating intellectual disability as of the standard of adaptive behavior
    expected of Smith’s age and cultural group. Accordingly, we find the
    state court’s determination that McCarver and LeBlanc were more
    credible witnesses than Hight is not fairly supported by the record.
    38                       SMITH V. SCHRIRO
    Smith’s mother, Sylvia Scott (Joe Lambright’s wife),
    Gerald Lambright, and the presentence report all described
    Smith as a follower, a trait the Supreme Court has identified
    as an indicator of impaired adaptive behavior. Gerald said
    that Smith would do whatever Joe told him to do, adding that
    “it was almost like the guy could not think for himself.” See
    
    Atkins, 536 U.S. at 318
    (“in group settings [intellectually
    disabled people] are followers rather than leaders”). The
    presentence report describes Smith as having a “borderline
    personality,” which is also probative of Smith’s condition at
    the time of Smith’s crime and trial.23
    Moreover, Smith demonstrated a lifelong inability to
    make informed decisions regarding his own safety and
    welfare. Specifically, Smith was described as having poor
    judgment as a child and engaging in dangerous behavior
    without awareness of its risks. As an adult, Smith accepted
    dares to run across the highway in front of an oncoming truck
    and climb to the top of a radar tower hundreds of feet tall,
    where he dangled himself by his arms. He would sometimes
    23
    Dr. Thompson testified that he found this assessment in the
    presentence report credible notwithstanding the lack of evidence regarding
    the author’s level of training because, in his experience working with the
    Department of Corrections, the probation and parole officers who wrote
    such reports had experience with prisoners and diagnostic evaluations that
    provided them a reasonable basis from which to determine whether an
    individual has low or borderline cognitive functioning and because the
    report’s findings are corroborated by substantial evidence of Smith’s
    impaired mental functioning. We agree that the report constitutes
    probative lay witness testimony of Smith’s disability. See 
    Arellano, 143 P.3d at 1020
    . Accordingly, and in light of the foregoing discussion
    of the limitations of the Rule 11 reports, we find the state court’s
    determination to afford the Rule 11 reports greater weight than the
    presentence report, and its critique of Dr. Thompson’s contrary
    conclusion, lacks fair support in the record.
    SMITH V. SCHRIRO                       39
    go up on the top of buildings where carpentry work was being
    performed and jump along the beams and rafters without any
    safety harness. On one occasion while in prison, Smith took
    a walk along the edge of the roof of a two-story building,
    earning a rebuke from Labrecque. Such reckless behavior,
    apparently undertaken without any comprehension of the
    risks involved, further demonstrates Smith’s inability to meet
    the expected standards of personal independence.
    Although Dr. Martinez viewed Smith’s ability to date
    women as evidence of his adaptive abilities, that testimony is
    clearly of little worth. The only evidence of Smith’s romantic
    life is his five failed marriages, the details of which paint a
    picture inconsistent with Dr. Martinez’s assessment. Smith’s
    first three marriages lasted a cumulative total of nineteen
    months. The presentence report notes that Smith beat his
    fourth wife, threatened her life, enjoyed tying her up and
    pretending to rape her, and on other occasions forced her to
    submit to anal intercourse against her will. Smith married
    Beth Lewis, his fifth wife, in November 1980, shortly before
    his arrest. According to Lewis, at one point she decided to
    end their relationship and Smith became very angry; he
    grabbed a gun and, shaking it in front of her, said “You want
    to end it? I can end it for us.” Afraid for her life, Lewis said
    that she would “do anything.” After contemplating this offer,
    Smith decided the pair should get married. That same
    evening, Smith pushed Lewis into the backseat of her car and
    tore off her pantyhose. Lewis said she began screaming and
    crying and begged Smith to stop, which he did, leading her to
    conclude that “[s]o he didn’t actually I guess rape me.”
    Following this encounter, Smith drove by Lewis’s home on
    several occasions and waved a pistol at her; the couple
    married a short time later. We fail to see how Smith’s serial
    marriages, at least some of which involved death threats as
    40                    SMITH V. SCHRIRO
    well as incidents of simulated and actual sexual assault,
    exhibit the “standards of personal independence and social
    responsibility expected of the defendant's age and cultural
    group.” Rather, they further demonstrate the adaptive
    impairments affecting this and so many other areas of Smith’s
    childhood and adult life.
    Testimony by Dr. Thompson and Dr. Martinez indicating
    that Smith possessed some adaptive skills does not alter the
    conclusion that it is highly probable that Smith experienced
    significant impairment in adaptive behavior at the relevant
    times. The evidence that Smith exhibited limited adaptive
    abilities is substantially outweighed by evidence of more far-
    reaching adaptive impairments. We note, moreover, that
    Arizona law does not mandate a complete absence of
    adaptive strengths. See Grell 
    III, 291 P.3d at 357
    (“The
    record also contains some indications of Grell's limited ability
    to adapt. Although this evidence makes our decision difficult,
    a diagnosis of mental retardation, as statutorily defined, does
    not require a complete absence of adaptive skills.”).
    Nor do we regard the Rule 11 reports as inconsistent with
    our conclusion. As the Supreme Court and our own Court
    have held, the ultimate conclusions stated in these
    reports—that Smith understood the difference between right
    and wrong, and was competent to stand trial—are not
    inconsistent with intellectual disability. See 
    Atkins, 536 U.S. at 318
    (“Mentally retarded persons frequently know the
    difference between right and wrong and are competent to
    stand trial.”); Rohan ex rel. Gates v. Woodford, 
    334 F.3d 803
    ,
    810 n. 3 (9th Cir. 2003) (“Incompetence and mental
    retardation are overlapping but distinct categories. Many
    retarded individuals are still competent to stand trial.”),
    abrogated on other grounds by Ryan v. Gonzales, 133 S. Ct.
    SMITH V. SCHRIRO                       41
    696 (2013). Nor, for that matter, is Dr. LaWall’s finding that
    Smith had a personality disorder with antisocial features
    inconsistent with our conclusion regarding impaired adaptive
    behavior, especially in light of Smith’s immaturity and
    childlike conduct. See Grell 
    III, 291 P.3d at 354
    , 356 (citing
    expert testimony that “[i]f Grell had a mere conduct or
    personality disorder . . . he would have committed acts that
    were simply against the rules and deviant . . . , rather than
    acting, as he did, in ways that were embarrassing or
    immature,” and noting that antisocial personality disorder is
    not inconsistent with intellectual disability); Brumfield v.
    Cain, 
    135 S. Ct. 2269
    , 2280 (2015) (“[A]n antisocial
    personality is not inconsistent . . . with intellectual
    disability.”).
    The vast majority of the evidence strongly points to the
    conclusion that Smith was unable to “meet[] the standards of
    personal independence and social responsibility expected of
    [his] age and cultural group,” both before the age of eighteen
    and at the time of the crime. Ariz. Rev. Stat. Ann. § 13-
    703.02(K)(1). Accordingly, we conclude that the state
    court’s determination that Smith’s pre-arrest life did not show
    significant impairment in adaptive behavior is not fairly
    supported by the record.
    In sum, we conclude that under § 2254(d)(8) the clear
    weight of the evidence overcomes the presumption of
    correctness attaching to the state court’s finding that Smith
    was not intellectually disabled, as well as the state court’s
    ancillary factual determinations necessary to its ultimate
    conclusions. Specifically, we have found that the grounds on
    which the state court discounted Dr. Thompson’s testimony
    lack fair support in the record and are the product of legal
    error.
    42                       SMITH V. SCHRIRO
    2. The State Court Applied an Unconstitutional
    Standard of Proof
    The state court’s factual determination is not entitled to
    deference for a separate and independent reason. The Pima
    County Superior Court found Smith was not intellectually
    disabled by applying an incorrect and unconstitutional legal
    standard, a question of law we review de novo.
    As the Tenth Circuit has recognized in pre-AEDPA cases,
    a state court’s factual determination rendered under a
    constitutionally impermissible legal standard is not entitled to
    a presumption of correctness. See Lafferty v. Cook, 
    949 F.2d 1546
    , 1551 n. 4 (10th Cir. 1991) (“The initial inquiry must be
    whether the Utah court made its fact findings under the
    correct legal standard of competency. It is elemental that fact
    finding made under an erroneous view of the governing law
    cannot be presumed correct. Only after concluding that a state
    court used the proper standard does a habeas court turn to the
    issue of the presumption of correctness.”); accord Walker v.
    Att’y Gen for Oklahoma, 
    167 F.3d 1339
    , 1345 (10th Cir.
    1999) (“Mr. Walker’s competency was determined under a
    constitutionally impermissible standard of proof. Such a
    determination is not entitled to a presumption of
    correctness.”).24
    24
    The dissent in Lafferty contended that the majority erred by inserting
    an additional, preliminary step in its review of the state court’s factual
    determination, contrary to the requirements of 28 U.S.C. § 
    2254(d). 949 F.2d at 1558
    –59 & nn. 2–3 (Brorby, J., dissenting). The majority is
    clearly correct. Because a factual determination rendered under an
    erroneously inflated and unconstitutional legal standard does not resolve
    the question of whether the same answer obtains under the correct lower
    standard, the factual determination rendered cannot be said to constitute
    SMITH V. SCHRIRO                               43
    In the section of the Pima County Superior Court’s
    decision entitled “Burden of Proof,” the court described the
    legal standard governing Smith’s Atkins claim.25 The court
    subsequently analyzed the evidence, after which it set forth its
    ultimate finding in the final section of its opinion. It
    concluded that “the circumstances described at the hearing do
    not point to mental retardation with any degree of certainty.”
    (Emphasis added.) A court’s recitation of the proper
    governing legal standard does not insulate its holding from
    habeas review where the record demonstrates that the court
    actually applied an unconstitutional standard. See Sears v.
    Upton, 
    561 U.S. 945
    , 952 (2010) (per curiam) (“Although the
    court appears to have stated the proper prejudice standard, it
    did not correctly conceptualize how that standard applies to
    the circumstances of this case.” (footnote omitted)). Here,
    because the state court made no other mention of the correct
    legal standard, and because its analysis provides no indication
    that the court actually applied the correct legal standard rather
    than the standard employed when it applied the law to the
    facts, its boilerplate statements in the introductory “Burden of
    Proof” section are of no force or effect.
    a valid finding. Where a state court has made no valid finding, there is
    nothing to which a presumption of correctness may attach.
    25
    In its introductory statement regarding the standard of review, the state
    court stated that Smith had the burden of proving his Atkins claim by clear
    and convincing evidence. It added that, due to the unique procedural
    posture of the case, it would also apply the preponderance of the evidence
    standard applicable to Rule 32 proceedings, and that its decision would be
    the same under that lower standard. The body of the opinion did not fulfill
    that promise, however, but, rather, the court concluded after reviewing all
    the evidence that it did not meet a “certainty” standard.
    44                    SMITH V. SCHRIRO
    Under Arizona law, the “any degree of certainty” standard
    applied by the Pima County Superior Court is more akin to
    the “reasonable doubt” standard than the clear and convincing
    standard mandated by Arizona’s Atkins statute, which
    requires only that the issue under consideration be “highly
    probable.” See State v. King, 
    763 P.2d 239
    , 243, 246 (Ariz.
    1988) (reversing trial court for providing erroneous jury
    instructions, and explaining that “[t]he instruction now before
    us utilized the term ‘certainty’ in defining the clear and
    convincing standard . . . . We believe that ‘certainty’ is truer
    to the concept of proof beyond a reasonable doubt than to the
    ‘highly probable’ meaning of the clear and convincing
    standard.”).
    To be sure, “[a] state’s misapplication of its own laws
    does not provide a basis for granting a federal writ of habeas
    corpus.” Roberts v. Hartley, 
    640 F.3d 1042
    , 1046 (9th Cir.
    2011). A state’s Atkins procedures present a special case,
    however. “‘[B]ecause Atkins reserved for the states the task
    of developing appropriate ways to enforce the constitutional
    restriction’ prohibiting the execution of the intellectually
    disabled, ‘federal courts conducting habeas review routinely
    look to state law . . . in order to determine how Atkins applies
    to the specific case at hand.’” Williams v. Mitchell, 
    792 F.3d 606
    , 612 (6th Cir. 2015) (quoting Black v. Bell, 
    664 F.3d 81
    ,
    92 (6th Cir. 2011)). Stated differently, Atkins leaves to the
    states the task of developing appropriate procedures to
    enforce the constitutional right, but constitutionalizes the
    procedures the state creates. Consequently, where a state
    court analyzing an Atkins claim fails to follow binding state
    law, its decision does not simply violate state law, but also
    violates the Eighth Amendment right provided by Atkins and
    the violation is therefore cognizable by a federal habeas court.
    
    Id. (“[W]here a
    state-court decision is ‘contrary to’ clearly
    SMITH V. SCHRIRO                       45
    established state supreme court precedent applying Atkins, the
    decision is ‘contrary to Atkins’ for purposes of habeas
    review” under AEDPA); see also 
    Black, 664 F.3d at 97
    (“[B]ecause Atkins defers to the individual states to set out
    the standard for a defendant to qualify as mentally retarded,
    the [state court’s] misinterpretation of [the state supreme
    court’s decision] is contrary to Atkins.”).
    Here, the “certainty” standard applied by the state trial
    court was plainly contrary to the clear and convincing
    standard required by Arizona’s statute and adopted by its
    supreme court. See Ariz. Rev. Stat. Ann. § 13-703.02(G);
    Grell 
    II, 135 P.3d at 701
    (“The statute places on ‘the
    defendant . . . the burden of proving mental retardation by
    clear and convincing evidence’ in the pretrial hearing.”
    (alteration in original) (quoting § 13-703.02(G))).
    Accordingly, the standard of proof applied by the state trial
    court was not simply contrary to state law but was also
    unconstitutional under Atkins, see 
    Williams, 792 F.3d at 612
    ;
    
    Black, 664 F.3d at 97
    , and, accordingly, the state court’s
    findings are not due any deference. See 
    Lafferty, 949 F.2d at 1551
    n. 4; 
    Walker, 167 F.3d at 1345
    .
    There is another reason the standard of proof applied by
    the state trial court is unconstitutional, and would be even if
    it were consistent with state law: a “certainty” standard of
    proof transgresses the limits of the state’s authority to craft
    appropriate procedures to enforce Atkins and, in so doing,
    encroaches on the substantive constitutional right. In
    reaching this conclusion, it is not necessary to determine what
    standard of proof the federal Constitution requires, but rather
    only whether the Arizona court applied a standard it forbids.
    Cf. Schriro v. 
    Smith, 546 U.S. at 7
    –8 (state Atkins procedures
    may, “in their application, be subject to constitutional
    46                    SMITH V. SCHRIRO
    challenge,” but the state must first have an opportunity to
    apply them).
    In Atkins, the Supreme Court did not announce a specific
    standard of proof governing claims of intellectual disability.
    Instead, the Court, citing Ford v. Wainwright, stated that it
    was “leav[ing] to the States the task of developing
    appropriate ways to enforce the constitutional restriction upon
    [their] execution of 
    sentences.” 536 U.S. at 317
    (quoting
    
    Ford, 477 U.S. at 405
    , 416–17). This did not leave the states
    unchecked discretion in determining such procedures,
    however. Rather, to be constitutional, a state’s procedures
    must constitute “appropriate ways to enforce the
    constitutional restriction.” 
    Id. (emphases added)
    (quoting
    
    Ford, 477 U.S. at 416
    ). The Court’s citation to Ford
    reinforces this view. In Ford, a majority of the Court found
    Florida’s specific procedures for determining the sanity of a
    condemned prisoner constitutionally inadequate. See 
    Ford, 477 U.S. at 413
    ; see also 
    id. at 418
    (plurality opinion); 
    id. at 424–25
    (Powell, J., concurring in part and concurring in the
    judgment); 
    id. at 427
    (O’Connor, J., concurring in the result
    in part and dissenting in part).
    When the natural operation of a state’s procedures for
    rendering factual determinations transgresses a substantive
    constitutional right, those procedures are unconstitutional.
    See Bailey v. Alabama, 
    219 U.S. 219
    , 239–44 (1911). It is
    elementary that the “natural operation” of applying a
    heightened standard of proof can determine the outcome of
    litigation, and thus the availability of a constitutional right.
    See 
    id. at 244
    (stating that “we must consider the natural
    operation of the statute here in question”). As the Supreme
    Court has recognized, it is often impossible to ascertain
    disputed facts with absolute certainty. Victor v. Nebraska,
    SMITH V. SCHRIRO                       47
    
    511 U.S. 1
    , 14 (1994). Consequently, “the trier of fact will
    sometimes, despite his best efforts, be wrong in his factual
    conclusions.” In re Winship, 
    397 U.S. 358
    , 370 (1970)
    (Harlan, J., concurring). “The function of a standard of proof
    . . . is to ‘instruct the factfinder concerning the degree of
    confidence our society thinks he should have in the
    correctness of factual conclusions for a particular type of
    adjudication.’” Addington v. Texas, 
    441 U.S. 418
    , 423 (1979)
    (quoting In re 
    Winship, 397 U.S. at 370
    (Harlan, J.,
    concurring)). As a result, “[t]he standard [of proof] serves to
    allocate the risk of error between the litigants.” 
    Addington, 441 U.S. at 423
    ; see Cooper v. Oklahoma, 
    517 U.S. 348
    , 362
    (1996) (“The ‘more stringent the burden of proof a party must
    bear, the more that party bears the risk of an erroneous
    decision.’” (quoting Cruzan v. Director, Mo. Dept. of Health,
    
    497 U.S. 261
    , 283 (1990))).
    Atkins claims present a heightened risk of an erroneous
    factual conclusion. Unlike factual determinations in which
    the basic issue is whether a fact occurred—for example,
    whether a defendant actually committed the act of which he
    is accused—determinations like intellectual disability, which
    depend upon psychiatric diagnosis, turn on an expert’s
    interpretation of the meaning of various facts. Cf. 
    Addington, 441 U.S. at 429
    . As the Supreme Court explained in rejecting
    the argument that the Constitution requires use of a
    reasonable doubt standard in the context of civil commitment
    proceedings, the unique nature of psychiatric diagnosis
    renders factual determinations uniquely unsusceptible to
    certainty.
    The subtleties and nuances of psychiatric
    diagnosis render certainties virtually beyond
    reach in most situations. The reasonable-doubt
    48                   SMITH V. SCHRIRO
    standard of criminal law functions in its realm
    because there the standard is addressed to
    specific, knowable facts. Psychiatric
    diagnosis, in contrast, is to a large extent
    based on medical “impressions” drawn from
    subjective analysis and filtered through the
    experience of the diagnostician. This process
    often makes it very difficult for the expert
    physician to offer definite conclusions about
    any particular patient. Within the medical
    discipline, the traditional standard for
    “factfinding” is a “reasonable medical
    certainty.” If a trained psychiatrist has
    difficulty with the categorical “beyond a
    reasonable doubt” standard, the untrained lay
    juror—or indeed even a trained judge—who
    is required to rely upon expert opinion could
    be forced by the criminal law standard of
    proof to reject commitment for many patients
    desperately in need of institutionalized
    psychiatric care.
    ...
    We have concluded that the reasonable-doubt
    standard is inappropriate in civil commitment
    proceedings because, given the uncertainties
    of psychiatric diagnosis, it may impose a
    burden the state cannot meet and thereby erect
    an unreasonable barrier to needed medical
    treatment.
    
    Id. at 430–32
    (citations omitted). Similar concerns also arise
    in other contexts requiring psychiatric diagnosis. See Ford,
    SMITH V. SCHRIRO                              
    49 477 U.S. at 426
    (Powell, J., concurring in part and concurring
    in the judgment) (sanity); 
    Cooper, 517 U.S. at 365
    , 369
    (competency).
    The concern espoused in Addington regarding the
    inherent imprecision of psychiatric determinations of mental
    illness for the purpose of civil commitment applies with even
    greater force to psychiatric determinations of intellectual
    disability under Atkins.26         Unlike civil commitment
    proceedings, which inquire into whether an individual is
    presently mentally ill and poses a danger to himself or others,
    the age of onset element of Atkins claims requires a
    retrospective analysis of the individual’s childhood capacity
    that may be years or, as in this case, even decades removed
    from the time of trial. Moreover, in cases like this, in which
    the trial predates Atkins and Petitioner’s claim arises for the
    first time on habeas, the determination of mental condition at
    the time of commission of the crime may occur not at trial but
    rather decades afterwards. Smith’s case illustrates the
    difficulties that inhere in such an inquiry: as discussed below,
    records detailing the administration of childhood IQ tests are
    unavailable, and lay witnesses untrained in psychology are
    asked to share distant recollections of Petitioner’s behavior as
    a child and young adult. Certainty is thus even less attainable
    26
    It is of no consequence to the analysis that Addington and Atkins
    involve different burdens of proof than the case at bar, because the focus
    here is on the effect of the standard of proof. Under Addington, a state
    desiring the civil commitment of an individual must demonstrate that he
    suffers from mental illness, whereas under Atkins an individual seeking to
    avoid execution by the state must demonstrate intellectual disability. In
    both situations, the determination heavily relies upon psychiatric opinion,
    and thus in both situations a standard of proof requiring “any degree of
    certainty” as defined by Arizona law will often render it impossible for a
    party to carry its burden. See 
    Addington, 441 U.S. at 432
    .
    50                    SMITH V. SCHRIRO
    and a certainty standard is even less constitutionally
    acceptable in such cases.
    Further compounding the likelihood of error in Atkins
    claims is the fact that the overwhelming majority (85 percent)
    of individuals with intellectual disability fall into the “mild”
    category, for whom the likelihood of misdiagnosis is
    particularly acute. As young children such individuals are
    often indistinguishable from children without intellectual
    disability, and as adults they can acquire social and vocational
    skills adequate for minimum self-support. DSM-IV 43; see
    also AAIDD 11th ed., at 47 (“Individuals with [intellectual
    disability] typically demonstrate both strengths and
    limitations in adaptive behavior.”). In fact, Daryl Atkins
    himself maintained that he was only “mildly mentally
    retarded.” 
    Atkins, 536 U.S. at 308
    . However, Atkins applies
    equally to all intellectually disabled individuals irrespective
    of the degree of their disability.
    Not only are Atkins claims uniquely susceptible to
    erroneous factual determinations, but they occur in a
    context—capital punishment—requiring a heightened degree
    of certainty that the decision is not erroneous. “Because the
    standard of proof affects the comparative frequency of . . .
    erroneous outcomes, the choice of the standard to be applied
    in a particular kind of litigation should, in a rational world,
    reflect an assessment of the comparative social disutility of
    each.” In re 
    Winship, 397 U.S. at 371
    (Harlan, J.,
    concurring). The Supreme Court’s repeated holdings that
    capital cases require a heightened degree of certainty that the
    punishment is lawful make clear its determination that the
    social “disutility” of a wrongful execution outweighs the
    “disutility” of errors favoring defendants. See Gilmore v.
    Taylor, 
    508 U.S. 333
    , 342 (1993) (“[T]he Eighth Amendment
    SMITH V. SCHRIRO                              51
    requires a greater degree of accuracy and factfinding than
    would be true in a noncapital case.”); 
    Ford, 477 U.S. at 411
    (plurality opinion); Lockett v. Ohio, 
    438 U.S. 586
    , 604–05
    (1978) (plurality opinion) (“[The] qualitative difference
    between death and other penalties calls for a greater degree of
    reliability when the death sentence is imposed. . . . When the
    choice is between life and death, [a heightened risk of
    wrongful execution created by a state statute] is unacceptable
    and incompatible with the commands of the Eighth and
    Fourteenth Amendments.”); Woodson v. North Carolina,
    
    428 U.S. 280
    , 305 (1976) (plurality opinion). Accordingly,
    where, as in Atkins, the Eighth Amendment renders a class of
    individuals categorically ineligible for execution, the
    procedures used to determine whether a defendant falls into
    that class may not allocate nearly all of the risk of an
    erroneous determination to the defendant.
    By requiring Smith to demonstrate with a “degree of
    certainty” that he is intellectually disabled, the Arizona court
    disregarded this fundamental rule. Simply stated, the court
    took the highly unusual step27 of allocating nearly the entire
    risk of an erroneous determination to Smith. That the factual
    determination in question concerned an issue for which
    certainty may be unattainable, cf. 
    Addington, 441 U.S. at 429
    –32, and a penalty for which a greater degree of reliability
    27
    Only Georgia applies a more onerous standard, requiring proof of
    intellectual disability beyond a reasonable doubt. By contrast, every other
    state to establish a standard of proof imposes a more relaxed standard than
    the state court applied here. In addition to Arizona, only four
    states—Colorado, Delaware, Florida, and North Carolina—apply even a
    clearly convincing standard, and the remaining twenty-two states
    imposing the death penalty and the federal government apply a
    preponderance standard. Hill v. Humphrey, 
    662 F.3d 1335
    , 1365 n. 1
    (11th Cir. 2011) (en banc) (Barkett, J., dissenting).
    52                      SMITH V. SCHRIRO
    is required, see, e.g., 
    Gilmore, 508 U.S. at 342
    ; 
    Lockett, 438 U.S. at 604
    –05 (1978) (plurality opinion), renders the
    constitutional violation even more clear. Like the Alabama
    statute in Bailey, the standard of proof applied by the Pima
    County Superior Court in this case transgresses a substantive
    constitutional right by accomplishing indirectly what the state
    may not do directly: the execution of individuals who are
    intellectually disabled under Atkins. See 
    Bailey, 219 U.S. at 239
    (“It is apparent that a constitutional prohibition cannot be
    transgressed indirectly by the creation of a [procedural rule]
    any more than it can be violated by direct enactment.”);
    
    Atkins, 536 U.S. at 321
    . Because it impairs the substantive
    right, the state court’s “certainty” standard of proof is not an
    “appropriate way[] to enforce the constitutional [protection]”
    mandated by Atkins. 
    Atkins, 536 U.S. at 317
    . In short, the
    Constitution forbids requiring a defendant to demonstrate
    intellectually disability with “any degree of certainty.”28
    Because the Pima County Superior Court made its finding
    that Smith is not intellectually disabled by applying an
    incorrect and unduly onerous legal standard, its ultimate
    factual determination is not consonant with the Eighth
    Amendment. A finding that is made pursuant to the wrong
    legal standard is not a finding at all. Accordingly, the state
    court’s application of an unconstitutional standard of proof
    provides an independent and alternative ground for denying
    its determination a presumption of correctness.
    28
    Because Smith satisfies the lower “clearly convincing” standard
    required by Arizona’s Atkins statute, it can be assumed without deciding
    that the statutory standard is constitutional. However, many of the
    concerns expressed here apply to the clear and convincing standard as
    well.
    SMITH V. SCHRIRO                       53
    D. Whether Smith is Intellectually Disabled
    Having determined that the state court’s determination is
    not entitled to a presumption of correctness, we must review
    the record de novo to determine whether Smith has
    demonstrated intellectual disability by clear and convincing
    evidence, as required by Arizona law. For all the reasons set
    forth in Section II.C.1, we hold that he has. Considering
    Smith’s intellectual functioning test scores and his history of
    significantly impaired adaptive behavior, as we must under
    Atkins and Hall, we find that the record in this case
    overwhelmingly demonstrates that Smith satisfied the two
    substantive prongs of Arizona’s definition of intellectual
    disability both prior to age eighteen and at the time of the
    crime. Specifically, Smith’s Otis test score of 62, combined
    with his poor academic performance, clearly demonstrates the
    childhood onset of his significantly subaverage general
    intellectual functioning. The record further demonstrates
    that, consistent with Dr. Thompson’s testimony, Smith also
    experienced this condition at the time of the crime:
    improvement in Smith’s intellectual functioning did not occur
    until after his incarceration in a structured environment, when
    he began receiving appropriate antidepressant medication as
    well as tutoring from Labrecque and Schad. The many
    parallels between Smith’s life and that of the capital
    defendant in Grell, including Smith’s stunted communication
    skills, lack of personal care skills, severe immaturity, and
    inability to maintain employment and personal relationships,
    reveal his significant impairment in adaptive behavior as a
    child and at the time of the crime, as does his general lifelong
    inability to navigate his social world.
    There can be no doubt that the crime in this case was truly
    horrific. The Constitution, however, regards intellectually
    54                   SMITH V. SCHRIRO
    disabled defendants as less morally culpable for their crimes,
    and for this reason prohibits their execution. 
    Atkins, 536 U.S. at 316
    ; 
    Hall, 134 S. Ct. at 1992
    . Viewing the record as a
    whole, we find that Smith has demonstrated by clear and
    convincing evidence significantly subaverage general
    intellectual functioning existing concurrently with significant
    impairment in adaptive behavior, and that both conditions
    were manifested prior to age eighteen and at the time Smith
    committed the capital offense. The overwhelming weight of
    the evidence compels this result. Smith is intellectually
    disabled and may not be executed. 
    Atkins, 536 U.S. at 316
    ;
    
    Hall, 134 S. Ct. at 1992
    . Accordingly, we reverse Smith’s
    death sentence and remand to the district court with
    instructions to grant the writ as to his capital sentence.
    CONCLUSION
    The judgment of the district court is reversed. We
    remand with instructions to grant the writ with respect to the
    penalty phase and return the case to the state court to reduce
    Smith’s sentence to life or natural life.
    REVERSED AND REMANDED.
    SCHROEDER, Circuit Judge, concurring in the judgment and
    concurring in part:
    I concur in all of Judge Reinhardt’s opinion except
    Section II.C.2.
    SMITH V. SCHRIRO                              55
    REINHARDT, Circuit Judge, specially concurring:
    Obviously, I concur entirely in the majority opinion. I
    write this special concurrence only because I feel compelled
    to convey my serious concerns regarding the constitutionality
    of Arizona’s Atkins statute. The issue before us is not limited
    to the case of Robert Smith. Rather, the constitutional
    infirmity of Arizona’s statute creates a recurring problem
    with potentially far-reaching consequences: Arizona has
    executed 15 inmates since Atkins,1 and 124 inmates remain on
    its death row, the eighth highest number of any state.2 As
    detailed below, if presented with the issue, I would likely
    hold that in light of Hall v. Florida, 
    134 S. Ct. 1986
    (2014),
    both substantive prongs of Arizona’s intellectual disability
    statute—governing “intellectual functioning” and “adaptive
    behavior”—violate the Eighth Amendment because they
    permit the execution of individuals whom Atkins deems
    categorically ineligible for capital punishment.3
    In Atkins, the Supreme Court cited the clinical definition
    for intellectual disability, but did not make clear that this
    1
    Bureau of Justice Statistics, “Prisoners executed under civil authority
    in the United States, by year, region, and jurisdiction, 1977-2014” (Dec.
    10, 2014).
    2
    This figure is current as of July 1, 2015. See Death Penalty
    I nfo rmatio n Center , Dea th Ro w I n ma tes b y S t a te,
    http://www.deathpenaltyinfo.org/death-row-inmates-state-and-size-death-
    row-year?scid=9&did=188#state (last visited Jan. 12, 2016).
    3
    The third element of the Arizona statute requires that the onset of the
    intellectual functioning and adaptive behavior deficits occur before the age
    of eighteen. Ariz. Rev. Stat. Ann. § 13-703.02(K)(3) (2006); Ariz. Rev.
    Stat. Ann. § 13-753(K)(3) (2015). There is no reason to believe that this
    element is in itself unconstitutional.
    56                    SMITH V. SCHRIRO
    definition was binding on the states. In Hall, however, the
    Court held that states must comply with elements of the
    clinical definition about which there exists a national
    consensus. Because both of Arizona’s substantive prongs are
    more restrictive than the clinical definition, and because a
    national consensus exists with regard to the pertinent
    elements of the clinical definition, Arizona’s statute is in all
    likelihood unconstitutional.
    A. The Supreme Court Embraces the Clinical
    Definition of Intellectual Disability
    In Atkins v. Virginia, 
    536 U.S. 304
    , 314–16, (2002), the
    Supreme Court identified a “national consensus” against
    executing the intellectually disabled, gleaned from its survey
    of states passing legislation exempting the intellectually
    disabled from the death penalty and the consistency of the
    direction of such legislative change. The Court defined
    “mental retardation” by citing two clinical definitions, one
    from the ninth edition of the American Association on Mental
    Retardation’s (AAMR) Mental Retardation: Definition,
    Classifications, and Systems of Support (9th ed. 1992)
    [hereinafter AAMR 9th ed.], and a second from the fourth
    edition of the American Psychiatric Association’s (APA)
    Diagnostic and Statistical Manual of Mental Disorders (4th
    ed. 2000) [hereinafter DSM-IV]. 
    Id. at 309
    n. 3. The AAMR
    defines intellectual disability as characterized by two clinical
    elements: (1) “significantly subaverage intellectual
    functioning,” (2) “existing concurrently with related
    limitations in . . . adaptive skill areas,” which must “manifest
    [themselves] before age 18.” AAMR 9th 
    ed., supra, at 1
    .
    The DSM-IV similarly defines intellectual disability as
    consisting of (1) “significantly subaverage general
    intellectual functioning,” (2) “accompanied by significant
    SMITH V. SCHRIRO                         57
    limitations in adaptive functioning,” where “[t]he onset . . .
    occurs[s] before age 18 years . . . .” 
    DSM-IV, supra, at 41
    .
    The Court noted that the states’ “statutory definitions of
    mental retardation are not identical, but generally conform to
    the clinical definitions” set forth by the AAMR and APA.
    Atkins, 536 US. at 317 n. 22.
    Atkins did not expressly state whether it was establishing
    a substantive definition of intellectual disability as a matter of
    federal law. The Court explained that “[t]o the extent there
    is serious disagreement about the execution of mentally
    retarded offenders, it is in determining which offenders are in
    fact retarded.” 
    Id. at 317.
    Citing Ford v. Wainwright,
    
    477 U.S. 399
    (1986), the Court explained that it “le[ft] to the
    State[s] the task of developing appropriate ways to enforce
    the constitutional restriction upon [their] execution of
    sentences.” 
    Atkins, 536 U.S. at 317
    (quoting 
    Ford, 477 U.S. at 405
    , 416–17) (first alteration added). Because the cited
    sections of Ford address only procedural issues, and say
    nothing regarding the substantive definition of insanity, a
    straightforward reading of the Court’s statement is that it
    leaves to the states the determination of procedural issues
    only. Stated differently, under this reading of Atkins, the
    Court did not leave to the states the task of defining
    intellectual disability, but merely the task of determining
    procedures capable of use in identifying intellectually
    disabled persons. Because a majority of the Court in Ford
    found Florida’s specific procedures for determining the
    sanity of a condemned prisoner inadequate “to achieve even
    the minimal degree of reliability required for the protection
    of any constitutional interest,” it is reasonable to conclude
    that a state’s discretion in even this area is similarly
    
    circumscribed. 477 U.S. at 413
    ; see also 
    id. at 418
    (plurality
    opinion); 
    id. at 424–25
    (Powell, J., concurring in part and
    58                    SMITH V. SCHRIRO
    concurring in the judgment); 
    id. at 427
    (O’Connor, J.,
    concurring in the result in part and dissenting in part).
    Nevertheless, courts generally interpreted Atkins to mean
    that the Supreme Court did not establish a substantive
    definition of intellectual disability, and instead included the
    substantive definition of intellectual disability as among the
    tasks left to the states. See Moorman v. Schriro, 
    672 F.3d 644
    , 648 (9th Cir. 2012) (“The Supreme Court in Atkins did
    not define mental retardation as a matter of federal law.”);
    Williams v. Cahill ex rel. Cnty. of Pima, 
    303 P.3d 532
    , 543
    (Ariz. Ct. App. 2013) (“[E]very other state court that has
    addressed the issue has determined or implied that Atkins
    allows the states to define mental retardation without strict
    adherence to the clinical standards. Of the thirty-three states
    that still permit use of the death penalty, courts in
    twenty-three have stated or implied that Atkins did not define
    mental retardation, but instead left that task to individual
    states.”).
    In Hall v. Florida, 
    134 S. Ct. 1986
    (2014), however, the
    Court held that, contrary to what the state courts and our own
    court had thought, Atkins set forth a substantive definition of
    intellectual disability encompassing those aspects of the
    clinical definition about which a national consensus exists.
    See 
    id. at 1993
    (“The question this case presents is how
    intellectual disability must be defined in order to implement
    these principles and the holding of Atkins.”); 
    id. at 1999
    (“The clinical definitions of intellectual disability . . . were a
    fundamental premise of Atkins.”); see also Van Tran v.
    Colson, 
    764 F.3d 594
    , 612 (6th Cir. 2014) (“In Hall, the
    Court reasoned that the Constitution requires the courts and
    legislatures to follow clinical practices in defining intellectual
    disability.”). In Hall, the Court held unconstitutional
    SMITH V. SCHRIRO                       59
    Florida’s use of a strict IQ score cut-off of 70 without taking
    into account the test’s margin of error, known as a “standard
    error of measurement” or “SEM,” because this approach
    deviated from the clinical definition embraced in Atkins, and
    because a national consensus existed with regard to this
    aspect of the clinical definition. 
    Hall, 134 S. Ct. at 2000
    ; see
    
    id. at 1997–98
    (finding a consensus against using a strict IQ
    score cut-off of 70 without considering the margin of error
    because such a practice is mandated by nine states at the
    most, and because all but one of the state legislatures to have
    considered the issue after Atkins and whose law has been
    interpreted by its courts have foregone use of a strict cut-off
    of 70).
    The Court concluded that although Florida’s statute
    appeared facially consistent with Atkins, the Florida Supreme
    Court had interpreted the provision more narrowly, rendering
    it inconsistent with Atkins and thus unconstitutional. 
    Id. at 1994,
    2000. Specifically, the Court stated that the Florida
    Supreme Court had held that an individual with an IQ score
    above 70 does not have an intellectual disability and is barred
    from presenting any other evidence to this effect, contrary to
    the medical community’s views that IQ scores are inherently
    imprecise and should be considered in light of their margin of
    error. 
    Id. at 1994–95.
    The Court explained that “IQ test
    scores should be read not as a single fixed number but as a
    range” taking into account the test’s inherent imprecision, and
    that “an individual’s score is best understood as a range of
    scores on either side of the recorded score.” 
    Id. at 1995.
    The
    Court thus held that “when a defendant’s IQ test score falls
    within the test’s acknowledged and inherent margin of error,
    the defendant must be able to present additional evidence of
    intellectual disability, including testimony regarding adaptive
    deficits.” 
    Id. at 2001.
    60                    SMITH V. SCHRIRO
    1. Arizona’s Definition of Intellectual
    Functioning is Unconstitutional
    While surveying other states’ approach to assessing the
    intellectual functioning prong of intellectual disability, the
    Hall Court questioned the constitutionality of Arizona’s
    method for determining IQ scores under Atkins but did not
    purport to decide the issue. 
    Id. at 1996–97.
    The version of
    Arizona’s statute in place at the time of Smith’s evidentiary
    hearing, like the current version of the statute, includes a hard
    IQ cut-off score of 70, and precludes a defendant from
    presenting additional evidence of intellectual disability if all
    of his or her IQ test scores are above 70. Ariz. Rev. Stat.
    Ann. § 13-703.02(F) (2006); Ariz. Rev. Stat. Ann. § 13-
    753(F) (2015). However, Arizona’s statute also instructs
    courts to “take into account the margin of error for the test
    administered.” Ariz. Rev. Stat. Ann. § 13-703.02(K)(5)
    (2006); Ariz. Rev. Stat. Ann. § 13-753(K)(5) (2015). Thus,
    like Florida’s statute, Arizona’s statute appears constitutional
    on its face. However, as in Hall, Arizona’s highest court has
    given the statute an unconstitutional construction. In State v.
    Roque, 
    141 P.3d 368
    , 402–03 (Ariz. 2006) (en banc), the
    Arizona Supreme Court rejected the defendant’s contention
    that his test score be considered in light of the test’s margin
    of error, explaining that “the [intellectual disability] statute
    accounts for margin of error by requiring multiple tests.”
    This approach to accounting for the margin of error—using
    multiple tests without taking into consideration the margin of
    error for each test administered—is expressly foreclosed by
    Hall. Rather, under Hall, a state must apply the margin of
    error—meaning the range of scores likely to represent the
    subject’s actual IQ—to every test administered. See 
    Hall, 134 S. Ct. at 1995
    –96 (“Even when a person has taken
    multiple tests, each separate score must be assessed using the
    SMITH V. SCHRIRO                       61
    SEM . . . . [B]ecause the test itself may be flawed, or
    administered in a consistently flawed manner, multiple
    examinations may result in repeated similar scores, so that
    even a consistent score is not conclusive evidence of
    intellectual functioning.”). Thus, as in Hall, the state’s
    highest court has interpreted a facially constitutional statute
    to unconstitutionally exclude application of the SEM to each
    individual IQ test administered. Because Arizona’s Supreme
    Court construes the statutory requirement to consider a test’s
    margin of error in a manner directly contrary to that required
    by Hall, it renders unconstitutional the IQ provision of
    Arizona’s statute—the intellectual functioning prong of
    intellectual disability.
    2. Arizona’s Definition of Adaptive Behavior is
    Unconstitutional
    Although Hall did not address the second requirement for
    intellectual disability—limitations in adaptive behavior—its
    reasoning applies to this clinical element with equal force.
    Where states fail to abide by the clinical definition of
    “adaptive behavior” set forth in Atkins and adopted by a
    national consensus of states, they violate the Eighth
    Amendment just as they do in the case of intellectual
    functioning because they permit the execution of individuals
    whom Atkins deems ineligible for capital punishment. 
    Hall, 134 S. Ct. at 2001
    . In short, under Hall, if a state defines
    adaptive behavior more narrowly than the clinical definition,
    and if the clinical definition has been adopted by a national
    consensus of states, that prong likewise runs afoul of the
    Eighth Amendment. Such is the case with Arizona’s
    statutory definition of “adaptive behavior,” as construed by
    its Supreme Court. The only difference is that here the
    constitutional violation is even clearer.
    62                       SMITH V. SCHRIRO
    a. A National Consensus Exists With Regard
    to the Clinical Definition
    As in Hall, to determine whether a national consensus
    exists within the context of the Eighth Amendment, courts
    look to “‘objective indicia of society’s standards.’” 
    Id. at 1996
    (quoting Roper v. Simmons, 
    543 U.S. 551
    , 563 (2005)).
    To do so, we must consider the number of states that
    “implement the protections of Atkins by” following the
    clinical definition of adaptive behavior, 
    id., either expressly
    by statute or by judicial interpretation, see 
    Roper, 543 U.S. at 564
    (deeming as evidence of a national consensus those states
    prohibiting the juvenile death penalty “by express provision
    or judicial interpretation”), including in this figure those
    states that have abolished the death penalty, see Hall, 134 S.
    Ct. at 1997. As further evidence of a national consensus,
    courts also consider the direction and consistency of the
    change in how states have defined adaptive behavior since
    Atkins was decided. See 
    id. at 1997–98
    . If a court determines
    that such a consensus exists, it proceeds to the next step and
    determines whether, in its independent judgment, a state’s
    definition of adaptive behavior is constitutional or
    unconstitutional. 
    Id. at 2000.
    There exists a clear national consensus in favor of using
    the clinical definition of adaptive behavior. Only four states
    including Arizona define “adaptive behavior” in non-clinical
    terms.4 A fifth appears to require no showing of impaired
    adaptive behavior at all, and in nine states the definition of
    adaptive behavior is unclear. Because nothing in the nine
    states’ statutes or case law suggests that courts in those states
    4
    A complete list of states referenced in this section and accompanying
    authorities is provided in Appendix A.
    SMITH V. SCHRIRO                         63
    define adaptive behavior in non-clinical terms, the result is
    that only five, or at the very most fourteen, states can be said
    to permit the use of a non-clinical definition to analyze
    adaptive behavior under Atkins.
    In contrast, thirty-six states prohibit use of a non-clinical
    definition of adaptive behavior in determining whether an
    individual is intellectually disabled under Atkins. These
    include the nineteen states that have abolished the death
    penalty, and one that has suspended its use. See 
    id. at 1997
    (counting among the national consensus those states that have
    abolished the death penalty, and one that has suspended its
    use). In addition, sixteen states expressly require use of the
    clinical definition, either by statute or by interpretation of the
    courts. See 
    Roper, 534 U.S. at 564
    . The thirty-six states
    prohibiting use of a non-clinical definition of adaptive
    behavior far exceed the number of states the Supreme Court
    has required to establish a national consensus. See 
    Atkins, 536 U.S. at 313
    –15 (30 states prohibit the death penalty for
    the intellectually disabled); 
    Roper, 543 U.S. at 564
    (30 states
    prohibit juvenile execution).
    As in Hall, it is not simply the aggregate numbers that
    determine the existence of a national consensus but also the
    “[c]onsistency of the direction of the 
    change.” 134 S. Ct. at 1997
    –98 (comparing the number of states that since Atkins
    have passed legislation setting a strict IQ score cutoff at 70
    with the number of states to either abolish the death penalty
    or pass legislation allowing defendants to present additional
    evidence of intellectual disability when their IQ test score is
    above 70 but within the margin of error). Since Atkins was
    decided, only one state has passed legislation defining
    adaptive behavior in non-clinical terms. During the same
    period, six states abolished the death penalty legislatively, a
    64                       SMITH V. SCHRIRO
    court invalidated the death penalty in a seventh, and six other
    states passed legislation mandating use of the clinical
    definition, either as expressly stated in the state’s statute or as
    interpreted by the courts. Since Atkins, “no state that
    previously [defined adaptive behavior in clinical terms] has
    modified its law” to mandate a non-clinical definition. 
    Id. at 1998.
    Having determined that a national consensus of states
    forbids use of a non-clinical definition, as indicated by the
    number of states taking this approach and the consistency of
    the direction of change, the final step in a court’s inquiry is to
    apply its own independent judgment to the constitutionality
    of Arizona’s definition of adaptive behavior. See 
    id. at 1999
    –2000.
    b. Arizona’s Definition is Narrower than the
    Clinical Definition
    The two clinical definitions cited in Atkins and endorsed
    by a national consensus—the ninth edition of the AAMR and
    the DSM-IV—define impaired adaptive behavior as the
    existence of deficits in two or more skill areas among a list of
    ten or eleven total such areas.5 
    Atkins, 536 U.S. at 309
    n. 3.
    5
    The ten adaptive skill areas enumerated in the ninth edition of the
    AAMR are communication, self-care, home living, social skills,
    community use, self-direction, health and safety, functional academics,
    leisure, and work. AAMR 9th 
    ed., supra, at 1
    , 5, 38. The DSM-IV sets
    forth a nearly identical list of eleven skill areas, consisting of
    communication, self-care, home living, social/interpersonal skills, use of
    community resources, self-direction, functional academic skills, work,
    leisure, health, and safety. 
    DSM-IV, supra, at 41
    . See John H. Blume et
    al., Of Atkins and Men: Deviations from Clinical Definitions of Mental
    Retardation in Death Penalty Cases, 18 Cornell J.L. & Pub. Pol'y 689, 691
    SMITH V. SCHRIRO                             65
    These deficits in themselves have been clinically deemed
    sufficient to show the impairment of adaptive skills generally.
    Other measures may, from a clinical standpoint, be under or
    over-inclusive, but in any event they fail to meet the clinically
    recognized requirements of Atkins and Hall. Courts generally
    reach the adaptive behavior prong only in the case of
    individuals who demonstrate an IQ of 70 or below, a score
    limited to about 2.3% of the population. AAMR 9th 
    ed., supra, at 37
    . When the individuals who meet the intellectual
    functioning prong are evaluated for impairment of adaptive
    skills under the Atkins clinical standards, only about 1% of
    the general population actually satisfies that standard and thus
    meets the clinical definition of intellectual disability. Am.
    Psychiatric Ass’n, Diagnostic and Statistical Manual of
    Mental Disorders 38 (5th ed. 2013) [hereinafter DSM-V]. In
    short, it is this 1% who are deemed to be intellectually
    disabled and thus under the constitution ineligible for the
    death penalty.
    Arizona’s means of determining impairment of adaptive
    behavior differs from the nationally agreed upon clinical
    definition even more substantially than does its IQ provision.
    Unlike the nationally approved clinical means of determining
    impaired adaptive behavior, which requires limitations in
    only a minority of established skill areas, Arizona assesses
    such limitations generally by examining on an overall basis
    “the effectiveness or degree to which the defendant meets the
    standards of personal independence and social responsibility
    expected of the defendant’s age and cultural group.” Ariz.
    Rev. Stat. Ann. § 13-703.02(K)(1) (2006); Ariz. Rev. Stat.
    Ann. § 13-753(K)(1) (2015).
    (2009) (describing the clinical criteria set forth in the AAMR and DSM-IV
    as “virtually identical”).
    66                    SMITH V. SCHRIRO
    Arizona courts interpret the state’s statutory provision in
    a manner that is entirely different than that required by Atkins
    and Hall. See State v. Grell, 
    135 P.3d 696
    , 709 (Ariz. 2006);
    accord State v. Boyston, 
    298 P.3d 887
    , 895 (Ariz. 2013). In
    Grell, the defendant asserted that he had satisfied the adaptive
    behavior prong of Arizona’s statute by demonstrating deficits
    in two of the eleven areas listed in the DSM-IV. 
    Grell, 135 P.3d at 709
    . Rejecting Grell’s claim that compliance
    with the DSM-IV, which Hall makes clear is the
    constitutionally required standard, satisfies the Arizona
    statute, the Arizona Supreme Court held that
    The defense claims to have clearly shown that
    Grell has deficits in two of the eleven areas
    listed in the DSM–IV and therefore has
    mental retardation. The DSM–IV definition of
    mental retardation, however, while similar in
    overall meaning, is not the same as the
    [Arizona] statutory definition. The statute
    requires an overall assessment of the
    defendant’s ability to meet society’s
    expectations of him. It does not require a
    finding of mental retardation based solely on
    proof of specific deficits or deficits in only
    two 
    areas. 135 P.3d at 709
    (citation omitted) (emphasis added).
    Construing the Arizona statute, the Grell Court then found
    that the defendant had failed to demonstrate a significant
    impairment in adaptive behavior. 
    Id. Thus, as
    construed by the Arizona courts, Arizona’s
    means of determining impairment of adaptive behavior is not
    simply different than the clinical means required by Hall: it
    SMITH V. SCHRIRO                        67
    specifically rejects the Supreme Court’s clinically based
    substantive standard; it is substantially more restrictive than
    the constitutionally required standard; and, it fails to cover
    numerous individuals deemed to be suffering from impaired
    adaptive behavior under the Constitution. 
    Williams, 303 P.3d at 548
    (Eckerstrom, P.J., dissenting) (“Arizona’s [adaptive
    behavior] statutory requirements substantially narrow the
    class of persons who are defined as mentally retarded when
    compared with the class of those who would be clinically
    defined as such”). This is because, unlike the nationally
    approved clinical standard, which requires deficits only in a
    minimal number of adaptive skill areas, Arizona’s definition,
    as interpreted by Arizona state courts, requires that
    impairments be considered globally and determined on an
    overall basis, regardless of the specific limitations that
    compel an individual’s classification as adaptively impaired
    under the constitutionally required clinical standard.
    Arizona’s standard departs from the clinical standard in
    two fundamental ways. First, it requires deficits in both of
    two general areas: social responsibility and personal
    independence. By contrast, an individual evaluated under the
    clinical definition need not manifest deficits in both of these
    or any other general areas, so long as he demonstrates deficits
    in at least two of a number of skill areas. Thus, individuals
    who demonstrate “significant limitations in . . . adaptive
    behavior” under the AAMR or DSM-IV standards based on
    factors other than overall social responsibility and personal
    independence (which are not discreet skill areas under either
    standard) will fail to satisfy Arizona’s less inclusive standard.
    The Arizona standard ignores the heterogeneous nature of
    adaptive behavior and imposes a one-size-fits-all definition
    that excludes many individuals falling under the clinical
    definition. See AAMR 9th ed. 13 (“[T]here is no one way
    68                    SMITH V. SCHRIRO
    that defines ‘retarded’ performance. Every person with
    mental retardation will differ in the nature, extent, and
    severity of their functional limitations . . . . The current
    definition reflects this fact by requiring the presence of
    limitations in two or more of a variety of adaptive skill areas
    but does not require any one single limitation or any specific
    combination of limitations.”).
    The second way in which Arizona’s standard diverges
    from the clinical definition is that it, unlike the clinical
    definition, includes an “overall assessment of the defendant’s
    ability to meet society’s expectations of him.” 
    Grell, 135 P.3d at 709
    . This means that a court may conclude that
    even an individual demonstrating adaptive deficits in the
    required areas of personal independence and social
    responsibility nevertheless does not meet the adaptive
    behavior prong under the Arizona statute because he has
    adaptive strengths in certain areas that outweigh adaptive
    deficits in others. This distinction is critical, because the
    clinical definition recognizes that adaptive weaknesses may
    coexist alongside adaptive strengths, and requires that
    adaptive skills be assessed independently of each other to
    prevent strengths in certain areas from outweighing
    weaknesses in others. See AAMR 9th ed. 6 (“Specific
    adaptive limitations often coexist with strengths in other
    adaptive skills or other personal capabilities”); 
    id. at 7
    (“[A]n
    individual may have a strength in a particular adaptive skill
    area (e.g., social skills) while having difficulty in another
    skill area (e.g. communication); and . . . an individual may
    possess certain strengths within a particular specific adaptive
    skill, while at the same time having limitations within the
    same area (e.g., functional math and functional reading,
    respectively).”). Because Arizona’s statutory definition of
    impaired adaptive behavior, as defined by its courts, is under-
    SMITH V. SCHRIRO                           69
    inclusive and would not cover numerous individuals who
    would be deemed to suffer from impaired adaptive behavior
    under the nationally recognized clinical definition, I believe
    that the Arizona statute, when properly before a federal court,
    will in all likelihood be held to be unconstitutional.
    Although the professional manuals cited in Atkins are no
    longer the most current versions, the same conclusion is
    equally likely with respect to the more recent editions.
    Although Atkins cites the 9th edition of the AAMR and the
    DSM-IV, 
    see 536 U.S. at 308
    n. 3, Hall cites the DSM-V and
    the eleventh definition of the American Association of
    Intellectual and Developmental Disabilities (AAIDD)
    (formerly the AAMR) (11th ed. 2010), 
    see 134 S. Ct. at 1994
    ,
    1995, 2000, 2001. Each of the editions cited in Hall retains
    the essential premise and characteristic of the clinical
    definition cited in Atkins and rejected by the Arizona
    Supreme Court: an individual must demonstrate deficits in
    only a number of skill areas among a larger list, deficits are
    not required in any specific listed categories, and adaptive
    deficits in certain categories are sufficient and need not be
    balanced against or outweighed by strengths in other areas.6
    See 
    Williams, 303 P.3d at 547
    n. 12 (Eckerstrom, P.J.,
    dissenting) (“[T]he revised AAIDD definition [of adaptive
    behavior] is not a meaningful departure from either the
    DSM–IV criteria or the AAMR’s prior definitional standard
    set forth in Atkins.”); Chase v. State, 
    171 So. 3d 463
    , 471
    (Miss. 2015) (“The [AAIDD and DSM-V definitions of
    intellectual disability] have not materially altered the
    diagnosis of intellectual disability [cited in Atkins] but have
    provided new terminology.”); United States v. Williams,
    6
    The relevant portions of each professional manual’s definition of
    adaptive behavior are set forth in Appendix B.
    70                   SMITH V. SCHRIRO
    
    1 F. Supp. 3d 1124
    , 1146–47 (D. Hawaii 2014). Most
    important, the Arizona Court of Appeals strongly questioned
    Atkins and expressly rejected the more recent version of the
    clinical elements, holding that Arizona is not bound by the
    AAIDD’s clinical guidelines because, under Grell, Arizona’s
    definition of adaptive behavior differs from the clinical
    definition. 
    Williams, 303 P.3d at 541
    .
    As the foregoing discussion demonstrates, the Arizona
    court denied Smith’s Atkins claim by applying a likely
    unconstitutional statute.       An example of how that
    unconstitutional statute works in practical effect is that with
    respect to Smith, the Arizona court made no assessment as to
    whether he met any two of the specific ten or eleven elements
    listed in Atkins or any of the three domains or elements
    referred to in Hall but instead relied on the state’s “overall
    assessment of [his] ability to meet society’s expectations of
    him” which the Arizona Supreme Court found to be the
    requirement prescribed in the Arizona statute. This is directly
    contrary to the substantive clinical standard required by
    Atkins and Hall. Finally, in this respect, it appears evident
    that, properly assessed, Smith qualifies as intellectually
    disabled under both the initial and updated medical standards.
    As in this case, the right announced in Atkins may be all
    that stands between an intellectually disabled defendant and
    an unconstitutional execution. However, Arizona’s statutory
    scheme, as interpreted by its courts, severely erodes that
    right. Given the gravity of this issue and the likelihood that
    it will arise in future cases, the Arizona legislature would do
    well to amend its statutory scheme to bring it within the
    boundaries of the Eighth Amendment.
    SMITH V. SCHRIRO                      71
    Appendix A
    I. States that retain the death penalty and define
    “adaptive behavior” in non-clinical terms.
    State         Citation
    1    Arizona       Ariz. Rev. Stat. Ann. § 13–753(F);
    State v. Grell, 
    135 P.3d 696
    , 709
    (Ariz. 2006).
    2    Texas         Tex. Health & Safety Code
    § 591.003(1); Ex parte Briseno,
    
    135 S.W.3d 1
    , 8–9 (Tex. Crim. App.
    2004).
    3    Utah          Utah Code Ann § 77–15a–102.
    4    Washington    Wash. Rev. Code
    § 10.95.030(2)(d).
    II. States that retain the death penalty but which do not
    require any showing of impaired adaptive behavior.
    State         Citation
    1    Kansas        Kan. Stat. Ann. §§ 21-6622(h), 76-
    12b01(i); State v. Maestas, 
    298 Kan. 765
    , 783 (Kan. 2014).
    72                 SMITH V. SCHRIRO
    III.   States that retain the death penalty in which the
    definition of “adaptive behavior” is unclear.
    State        Citation
    1     Colorado     Colo. Rev. Stat. Ann.
    § 18-1.3-1101(2).
    2     Georgia      Ga. Code Ann. § 17-7-131(a)(3).
    3     Indiana      Ind. Code § 35-36-9-2; Pruitt v.
    State, 
    834 N.E.2d 90
    , 108 (Ind.
    2005).
    4     Louisiana    La. Code Crim. Proc. Ann., art.
    905.5.1(H)(1)(b).
    5     Montana      Montana has no Atkins statute and
    no cases defining adaptive behavior.
    6     New          New Hampshire has no Atkins
    Hampshire    statute and no cases defining
    adaptive behavior.
    7     South        S.C. Code Ann.
    Carolina     § 16-3-20(C)(b)(10); Franklin v.
    Maynard, 
    588 S.E.2d 604
    , 605–06
    (S.C. 2003).
    8     South        SDCL § 23A-27A-26.2.
    Dakota
    9     Wyoming      Wyo. Stat. Ann. § 7-11-301(a)(iii).
    SMITH V. SCHRIRO                            73
    Kansas, New Hampshire, and Wyoming have not carried out
    any executions in decades.7 Colorado has carried out only
    one execution since 1977, and Montana and South Dakota
    have each carried out three;8 however, none of these cases
    appears to have involved a claim raising the Atkins-Hall
    issue. These states’ definitions thus deserve little weight.
    See 
    Hall, 134 S. Ct. at 1997
    ; 
    Atkins, 536 U.S. at 316
    .
    IV.        States that have abolished the death penalty.9
    1. Alaska
    2. Connecticut
    3. Hawaii
    4. Iowa
    5. Illinois
    6. Massachusetts
    7. Maryland
    8. Maine
    9. Michigan
    10. Minnesota
    11. Nebraska
    12. North Dakota
    13. New Jersey
    14. New Mexico
    15. New York
    16. Rhode Island
    7
    Death Penalty Information Center,
    http://www.deathpenaltyinfo.org/node/5741 (last visited July 31, 2015).
    8
    
    Id. 9 Death
    Penalty Information Center, States With and Without the Death
    Penalty, http://www.deathpenaltyinfo.org/states-and-without-death-pen
    alty (last visited July 20, 2015).
    74                  SMITH V. SCHRIRO
    17. Vermont
    18. Wisconsin
    19. West Virginia
    In addition, Oregon has suspended its death penalty and has
    executed only two individuals in the past 40 years. 
    Hall, 134 S. Ct. at 1997
    . Oregon does not define “adaptive
    behavior” by statute and Oregon courts have not considered
    the issue.
    V. States that retain the death penalty but utilize the
    clinical definition of “adaptive behavior.”
    State            Citation
    1    Alabama          Lane v. State, No. CR-10-1343,
    
    2013 WL 5966905
    , at *5 (Ala.
    Crim. App. 2013).
    2    Arkansas         Jackson v. Norris, 
    615 F.3d 959
    ,
    961–62 (8th Cir. 2010).
    3    California       In re Hawthorne, 
    35 Cal. 4th 40
    ,
    47–48 (Cal. 2005); Campbell v.
    Superior Court, 
    159 Cal. App. 4th 635
    , 641 (Cal. Ct. App. 2008).
    4    Delaware         Del. Code Ann. Tit. 11
    § 4209(d)(3)(d)(1).
    5    Florida          Hodges v. State, 
    55 So. 3d 515
    ,
    534 (Fla. 2010).
    6    Idaho            Idaho Code Ann. § 19-
    2515A(1)(A).
    SMITH V. SCHRIRO                      75
    7    Kentucky         Bowling v. Commonwealth,
    
    163 S.W.3d 361
    , 369–70 & n. 8
    (Ky. 2008).
    8    Missouri         Mo. Ann. Stat. § 565.030(6).
    9    Mississippi      Chase v. State, No. 2013-CA-
    01089-SCT, 
    2015 WL 1848126
    , at
    *1–6 (Miss. 2015).
    10   North            N.C. Gen. Stat. Ann. § 15A-
    Carolina         2005(a)(1)b.
    11   Nevada           Ybarra v. State, 
    247 P.3d 269
    ,
    273-74 & n. 6 (Nev. 2011).
    12   Ohio             State v. Lott, 
    97 Ohio St. 3d 303
    ,
    305 (Ohio 2002).
    13   Oklahoma         Okla. Stat. Ann. tit. 21
    § 701.10b(A).
    14   Pennsylvania     Commonwealth v. Hackett,
    
    99 A.3d 11
    , 27 (Pa. 2014).
    15   Tennessee        State v. Pruitt, 
    415 S.W.3d 180
    ,
    203-04 (Tenn. 2013).
    16   Virginia         Va. Code Ann.
    § 19.2–264.3:1.1(A); Walker v.
    Kelly, 
    593 F.3d 319
    , 323 & n.2
    (4th Cir. 2010).
    76                   SMITH V. SCHRIRO
    VI.    States that have passed legislation since Atkins
    defining adaptive behavior in non-clinical terms.
    State          Citation
    1     Utah           Utah Code Ann. § 77–15a–102
    (West 2003).
    VII.   States that have abolished the death penalty since
    Atkins.
    State          Citation
    1     Connecticut    2012 Conn. Pub. Acts no. 12–5.
    2     Illinois       725 Ill. Comp. Stat. Ann. 5/119-1
    (West 2011).
    
    3 Md. Md
    . Code Ann. Correc. Servs.
    §§ 3–901 et seq. (Lexis 2008).
    4     Nebraska       Neb. Laws. L.B. 268 (2015).
    5     New Jersey     N.J. Stat. Ann. § 2C:11–3(b)(1)
    (West Supp. 2007).
    6     New            N.M. Stat. § 31-18-14 (2009).
    Mexico
    The New York Court of Appeals invalidated New York’s
    death penalty under the State Constitution in 2004. People v.
    LaValle, 
    817 N.E.2d 341
    (N.Y. Ct. 2004). The legislature
    has not voted to reinstate it.
    SMITH V. SCHRIRO                      77
    VIII. States that have passed legislation since Atkins
    mandating use of the clinical definition of adaptive
    behavior.
    State          Citation
    1     California     Cal. Penal Code Ann. § 1376(a)
    (West Supp. 2003); In re
    Hawthorne, 
    35 Cal. 4th 40
    , 47–48
    (Cal. 2005).
    2     Delaware       Del. Code Ann. tit. 11
    § 4209(d)(3)(d)(1) (2002).
    3     Idaho          Idaho Code Ann. § 19-2515A(1)(A)
    (2003).
    4     Nevada         Nev. Rev. Stat. § 174.098.7 (2003);
    Ybarra v. State, 
    247 P.3d 269
    ,
    273-74 (Nev. 2011).
    5     Oklahoma       Okla. Stat. Ann. § 701.10b(A)
    (2006).
    6     Virginia       Va. Code Ann. § 19.2–264.3:1.1(A)
    (2003); Walker v. Kelly, 
    593 F.3d 319
    , 323 & n.2 (4th Cir. 2010).
    In 2014, Louisiana amended a 2003 statute that had been
    judicially construed as adopting the clinical definition, and
    codified a new definition that uses clinical language from the
    DSM-V but which has not yet been construed by courts. See
    La. Code Crim. Proc. Ann. Art. 905.5.1(H)(1) (2003)
    (amended 2009, 2014); State v. Williams, 
    22 So. 3d 867
    ,
    880–81 & n. 10 (La. 2009); Brumsfield v. Cain, 
    744 F.3d 918
    ,
    924 (5th Cir. 2014), overruled on other grounds (citing State
    78                  SMITH V. SCHRIRO
    v. Dunn, 
    41 So. 3d 454
    , 459 (La. 2010)); La. Code Crim. Proc.
    Ann. Art. 905.5.1(H)(1)(b) (2014).
    Appendix B
    Manual     Definition of Intellectual                Measurement                             Definition of Adaptive Skills
    Disability
    AAMR 9th    “Substantial limitations in      “limitations in two or more of the    “communication, self-care, home living, social skills,
    ed.         present functioning. . . .       following applicable adaptive skill   community use, self-direction, health and safety,
    characterized by                 areas”2                               functional academics, leisure, and work.”3
    [1] significantly subaverage
    intellectual functioning,
    [2] existing concurrently
    with related limitations . . .
    adaptive skill areas”1
    AAMR 10th   “characterized by                “performance that is at least two     “the collection of conceptual, social, and practical
    ed.         [1] significant limitations      standard deviations below the         skills that have been learned by people in order to
    both in intellectual             mean of either (a) one of the         function in their everyday lives.”
    functioning and [2] in           following three types of adaptive     • Conceptual skills: “Language (receptive and
    adaptive behavior as             behavior: conceptual, social, or          expressive), Reading and writing, Money
    SMITH V. SCHRIRO
    expressed in conceptual,         practical, or (b) an overall score        concepts, Self-direction”
    social, and practical            on a standardized measure of          • Social skills: “Interpersonal, Responsibility, Self-
    adaptive skills.”4               conceptual, social, and practical         esteem, Gullibility (likelihood of being tricked or
    skills.”5                                 manipulated), Naiveteé, Follows rules, Obeys
    laws, Avoids victimization”
    • Practical skills: “Activities of daily living (eating,
    transfer/mobility, toileting, dressing), Instrumental
    activities of daily living (meal preparation,
    housekeeping, transportation, taking medication,
    money management, telephone use), Occupational
    79
    skills, Maintains safe environments”6
    80
    Manual      Definition of Intellectual                Measurement                              Definition of Adaptive Skills
    Disability
    AAIDD 11th   “characterized by                “performance that is                   “the collection of conceptual, social, and practical
    ed.          [1] significant limitations in   approximately two standard             skills that have been learned and are performed by
    both intellectual                deviations below the mean of           people in their everyday lives.”
    functioning and [2] in           either (a) one of the following        • Conceptual skills: “language; reading and writing;
    adaptive behavior as             three types of adaptive behavior:          and money, time and number concepts”
    expressed in conceptual,         conceptual, social or practical or     • Social skills: interpersonal skills, social
    social, and practical            (b) an overall score on a                  responsibility, self-esteem, gullibility, naiveteé
    adaptive skills.”7               standardized measure of                    (i.e. wariness), follows rules/obeys laws, avoids
    conceptual, social, and practical          being victimized, and social problem solving
    skills.”8                              • Practical skills: activities of daily living (personal
    care), occupational skills, use of money, safety,
    health care, travel/transportation,
    schedules/routines, and use of the telephone”9
    DSM-IV       “[1] significantly               “significant limitations in adaptive   “communications, self-care, home living,
    subaverage general               functioning in at least two of the     social/interpersonal skills, use of community
    SMITH V. SCHRIRO
    intellectual functioning . . .   following skill areas”11               resources, self-direction, functional academic skills,
    that is accompanied by                                                  work, leisure, health, and safety”12
    [2] significant limitations in
    adaptive functioning”10
    Manual   Definition of Intellectual             Measurement                            Definition of Adaptive Skills
    Disability
    DSM-V     “a disorder . . . that       “at least one domain of adaptive     “Without ongoing support, the adaptive deficits limit
    includes both                functioning–conceptual, social or    functioning in one or more activities of daily life, such
    [1] intellectual and         practical–is sufficiently impaired   as communication, social participation, and
    [2] adaptive functioning     that ongoing support is needed in    independent living, across multiple environments,
    deficits in conceptual,      order for the person to perform      such as home, school, work, and community.”
    social, and practical        adequately in one or morel life
    domains.”                    settings at school, at work, at      Adaptive functioning deficits result in a “failure to
    home, or in the community.”13        meet developmental and socio-cultural standards for
    personal independence and social responsibility.”14
    “Adaptive functioning involves adaptive reasoning in
    three domains: conceptual, social, and practical.”
    • Conceptual domain: competence in memory
    language, reading, writing, math reasoning,
    acquisition of practical knowledge, problem
    SMITH V. SCHRIRO
    solving, and judgment in novel situations, among
    others.”
    • Social domain: “awareness of others’ thoughts,
    feelings, and experiences; empathy; interpersonal
    communication skills; friendship abilities; and
    social judgment, among others.”
    • Practical domain: learning and self-management
    across life settings, including personal care, job
    responsibilities, money management, recreation,
    self-management of behavior, and school and
    work task organization, among others.”15
    81
    82
    1. AAMR 9th ed., at 1, 5.
    2. 
    Id. 3. Id.
    at 5, 38.
    4. AAMR 10th ed., at 39.
    5. 
    Id. at 13,
    14.
    6. 
    Id. at 14,
    42, 198.
    7. AAIDD 11th ed., at 221.
    8. 
    Id. at 43.
    9. 
    Id. at 217,
    218, 222, 224.
    10. DSM-IV, at 41.
    11. 
    Id. SMITH V.
    SCHRIRO
    12. 
    Id. 13. Id.
    at 38.
    14. DSM-V, at 33.
    15. 
    Id. at 33,
    37.
    SMITH V. SCHRIRO                              83
    CALLAHAN, Circuit Judge, dissenting:
    The one thing everyone appears to agree on is that Smith
    is not intellectually disabled.1 When tested in 2005 the
    experts found that he had an IQ of between 87 and 93, well
    within the low-average to average range of intellectual
    ability. Yet despite this fact, the majority reverses because it
    is certain that Smith was intellectually disabled in 1980 when
    he murdered Sandy Owen. The majority reaches this
    conclusion by disregarding the findings of the state courts,
    denying those courts the deference they are due, and
    expressing supreme confidence in its own ability to detect
    past intellectual disability despite substantial conflicting
    evidence and the fact that Smith is not now intellectually
    disabled. Accordingly, I dissent.
    The majority recognizes that although Smith filed his
    federal habeas petition prior to the effective date
    Antiterrorism and Effective Death Penalty Act of 1996
    (AEDPA), the state court factual findings are entitled to a
    presumption of correctness.2 Nonetheless, the majority
    1
    As does the majority opinion, I use the term “intellectually disabled”
    rather than “mentally retarded” except where the term is used in quoted
    material.
    2
    Under pre-AEDPA law:
    We review the district court’s decision to grant habeas
    relief de novo. We review de novo questions of law and
    mixed questions of law and fact, whether decided by
    the district court or the state courts. The district court’s
    factual findings are reviewed for clear error. We
    therefore accept its findings “absent a definite and firm
    conviction that a mistake has been committed.” State
    court factual findings are entitled to a presumption of
    84                     SMITH V. SCHRIRO
    concludes that the state court’s factual determination is “not
    fairly supported by the record.” Op. 11. The majority is
    wrong as an objective review of the record discloses ample
    evidence to support the Arizona courts’ determination that
    Smith did not sustain his burden of showing that he was
    intellectually disabled in 1980.
    Section II C 2 of Judge Reinhardt’s “opinion” also
    contains his view—for which there is no concurrence—that
    the Arizona courts applied an “unconstitutional standard of
    proof.” This argument is based on an unreasonable reading
    of the trial court’s decision and a failure to give the state
    courts’ decisions the deference they are due. Judge
    Reinhardt’s opposition to the death penalty in Section 2 C of
    his opinion is neither the ruling of this panel nor of the Ninth
    Circuit.
    I. The Record Adequately Supports the
    Determination that Smith Failed to Show He Was
    Intellectually Disabled at the Time of the Murder
    and His Conviction.
    The majority boldly asserts that the finding that Smith has
    not shown that he was intellectually disabled at the time of
    the murder and his trial is not fairly supported by evidence.
    Op. 11. The majority recognizes, as it must, that there was
    conflicting evidence, but argues that “once we look behind
    each expert’s conclusion and consider the evidence on which
    correctness, subject to eight exceptions enumerated in
    the previous version of 28 U.S.C. § 2254(d).
    Sivak v. Hardison, 
    658 F.3d 898
    , 905–06 (9th Cir. 2011) (internal
    citations omitted).
    SMITH V. SCHRIRO                       85
    he relies,” the majority of the evidence supports a finding of
    intellectual disability. Op. 12 n. 7. This is not a fair reading
    of the record.
    A. The Record
    1. The Underlying Crime and Prior Judicial Proceedings
    In our 1999 en banc opinion affirming the denial of
    Smith’s first federal habeas appeal, we described the crime as
    follows:
    Lambright and Smith were traveling across
    the country with Lambright’s girlfriend,
    Kathy Foreman. Smith was troubled by the
    fact that while Lambright and Foreman had
    intercourse in his presence, he did not have
    anybody along to satisfy him. For his part,
    Lambright thought that he “would like to kill
    somebody just to see if he could do it.” [State
    v. Lambright], 138 Ariz. [63,] 66 [(1983)]
    . . . . They decided that both desires could be
    fulfilled, and they set out with Foreman to
    find a victim. They found Sandy Owen and
    kidnaped her. Smith raped her on the way to
    a mountain site where they all got out of the
    car and Smith raped Owen again as Lambright
    and Foreman had intercourse. What happened
    next was that Smith began choking Owen, and
    Lambright declared that she must be killed.
    So, “Lambright took Foreman’s knife out of
    its sheath and began stabbing the victim in the
    chest and abdomen, twisting the knife around
    inside of her. Smith held one of the victim’s
    86                    SMITH V. SCHRIRO
    arms while she was being stabbed, and
    Foreman held the other arm.” 
    Id. at 67.
    . . .
    After that, “Smith unsuccessfully tried to
    break Ms. Owen’s neck by twisting her head.
    Then Lambright, Foreman or both began
    cutting deeply into the victim’s neck with the
    knife. . . . The victim remained alive, and was
    at least semiconscious, as she attempted to
    raise herself up on one arm. Lambright
    picked up a large rock and hurled it at her
    head. Foreman testified that as he threw the
    rock he yelled ‘Die, bitch.’” 
    Id. The three
           then drove off in a celebratory mood, playing
    the piece “We Are the Champions” as they
    went. See 
    id. Once caught,
    the trio’s song
    changed. Foreman turned state’s evidence,
    was given immunity, and testified against her
    erstwhile lover and his friend. Lambright
    confessed, but deemed Smith to be the worst
    of the three. Smith, too, confessed, but he
    dubbed Foreman and Lambright as the real
    killers.
    In 1982, an Arizona jury convicted Robert Douglas Smith of
    first-degree murder, kidnaping, and sexual assault. Schriro
    v. Smith, 
    546 U.S. 6
    (2005). He was given the death penalty.
    Smith’s appeals and post-conviction proceedings proved
    unavailing. See Stewart v. Smith, 
    536 U.S. 856
    (2002). It
    was not until after the Supreme Court had denied him relief,
    that around 2004 Smith alleged for the first time that he was
    intellectually disabled and thus pursuant to Atkins v. Virginia,
    
    536 U.S. 304
    (2002), could not be executed. See Schriro v.
    Smith, 
    546 U.S. 6
    (2005). In December 2005, we entered an
    SMITH V. SCHRIRO                       87
    order suspending Smith’s federal proceedings and directing
    his counsel “to pursue state proceedings in Arizona to
    determine whether the state is prohibited from executing the
    petitioner in accordance with Atkins.” Smith v. Schriro, No.
    96-99025 (Dec. 12, 2005). The Arizona Superior Court, Pima
    County, held extensive proceedings concerning Smith’s
    intellectual disability before issuing its opinion on March 27,
    2008.
    2. The Evidence Concerning Intellectual Disability
    In 1964, when Smith was 15, he took the Otis IQ test and
    received scores of 62 and 71. The state court found that the
    “Otis test was developed in approximately the 1920’s and
    was outmoded at the time it was reportedly given to [Smith]
    in 1964.” More importantly, “[t]here is no evidence
    concerning the qualifications of the persons administering the
    tests, whether an appropriate protocol was followed, the
    specific circumstances of [Smith] at the times of the tests, or
    any of the other information required to determine the
    validity of these school record entries.”
    Moreover, by this time, Smith’s dysfunctional and
    abusive childhood had already had an effect on his education.
    At age 15 he scored in the 2nd to 5th percentiles on the
    Stanford Achievement Test, placing him seven years below
    his age level. Moreover, his school transcripts reveal that he
    received nearly all “Ds” and “Fs” in his academic studies.
    Indeed, Smith dropped out of school when he was 16.
    Between the time he left school at the age of 16, and his
    arrest some 15 years later in 1980, Smith had many jobs, a
    number of unstable relationships, and frequent changes of
    residence. The state court found that those who knew Smith
    88                    SMITH V. SCHRIRO
    stated that “he was one of a group of young men which
    included his co-defendant, Joe Lambert, Sidney LeBalanc and
    Charles McCarver, who lived together, worked together, and
    traveled together at various times during the 1970’s.” The
    state court found that the evidence from the 1970’s showed
    that Smith was a full participant in his adult life. It found that
    Smith:
    worked as a diesel mechanic, garage
    mechanic, car repossessor, truck driver, cable
    installer and apartment maintenance provider,
    among other things. While Defendant held a
    large number of jobs, he was consistently
    employed.       Defendant’s last employer
    indicated, in a form attached to Defendant’s
    pre-sentence report, that Defendant worked
    for approximately four months as a mechanic
    employed to maintain and repair equipment,
    that he received a raise after three months,
    that his work was rated “satisfactory” for job
    performance, work skills and attendance, and
    “ex cellent” for cooperation wi t h
    employer/supervisor and other employees,
    and that he would be considered for re-
    employment.
    Smith’s friend, LeBlanc, who sometimes worked for the
    same employer as Smith, stated that Smith had difficulties
    with paperwork and written tests, as opposed to hands-on or
    mechanical tasks. Similarly, Robert Lebrecque, a former
    maintenance man with the Arizona Department of
    Corrections, who worked with Smith for about eight years
    after he began serving his prison term, commented that
    although Smith “was a little slow at the beginning . . . [i]f I
    SMITH V. SCHRIRO                             89
    showed him how to do something, I only had to show him
    once.” Lebrecque recalled that Smith could read, “but
    seemed to have a hard time understanding what the written
    words meant.”3
    Smith was married five times in approximately 15 years.
    The state court, however, noted that while Smith “made poor
    choices in partners and had great difficultly maintaining
    relationships with women, this fact can be explained as
    arising from his loveless childhood just as well as it can be
    viewed as an indicator of the limitations of mental
    retardation.” Smith’s last marriage, which was entered into
    between the time of the offense and his arrest, “showed
    promise of being quite different from the others despite two
    incidents of violence in the relationship.” His fifth wife had
    known Smith since childhood. During this marriage Smith
    worked as a truck driver and performed dry-wall and other
    work in the apartment complex. His wife did not work
    outside the home and Smith supported her and her three
    children, for whom he was a loved, active father figure.
    After he was arrested, the pre-sentence report
    characterized Smith as having a “borderline mentality.” The
    state court, however, gave this description little weight
    because the “experience of this probation officer is unknown,
    and there was no indication that he had training as a
    psychologist or other mental health professional that would
    3
    Lebrecque further noted that because of Smith’s “lack of basic grade-
    school academic skills, and his short stature, Lebrecque initially thought
    his maturity level was that of a 12 to 14 year old.”
    90                         SMITH V. SCHRIRO
    provide the expertise required for any diagnostic
    observations.”4
    4
    The state court further explained:
    The pre-sentence report contains detailed descriptions
    of the offense, including a recitation of information
    obtained from written statements of Defendant to the
    court and his statements to law enforcement officers.
    Information concerning Defendant’s social, marital,
    educational, religious, and employment history, was
    also apparently obtained primarily from Defendant.
    The pre-sentence report does not mention any difficulty
    in obtaining this information from Defendant. The
    section entitled “Physical and Mental Health,” while
    noting Defendant’s depression, “very poor self
    concept,” sexual issues, drug abuse and early
    psychiatric treatment, did not mention mental
    retardation. The references to retardation were two. In
    the “education” section, the pre-sentence report writer
    stated: “Appended records indicate that intelligence
    tests administered during his eighth grade year revealed
    an IQ of 71, indicating that he is borderline but
    educable.” The “Evaluation Summary” includes the
    following sentence: “His borderline mentality probably
    makes him an easy person to manipulate and somewhat
    of a follower in social situations.” Defendant’s so-
    called “borderline mentality” is not mentioned as a
    mitigating circumstance - - in fact, the pre-sentence
    report noted that, “In view of the defendant’s known
    history and the circumstances of the instant offense, the
    Court may feel that there are no applicable mitigating
    circumstances.” It is at least as likely that the
    “borderline” language in the Evaluation Summary
    section simply reflected the pre-sentence report writer’s
    knowledge of the 1964 IQ test referenced in the school
    records, as that the pre-sentence report writer based the
    comment on an analysis of Defendant’s history and
    characteristics grounded in the appropriate expertise.
    There simply is no way to know.
    SMITH V. SCHRIRO                          91
    In addition, two mental health professionals, Dr. Martin
    Levy and Dr. John LaWall, performed Rule 11 evaluations of
    Smith in 1982 for purposes of his criminal trial proceedings.
    Both found Smith to be competent. Dr. Levy noted that
    Smith was neatly dressed and displayed logical, coherent
    thought.5 Dr. LaWall also noted that Smith “was neat and
    cooperative, and his mood somewhat depressed, with
    somewhat blunted affect.” Dr. LaWall’s report indicated that
    Smith was oriented to time, place, and person, with intact
    memory, and there was “no evidence of any disturbance of
    the form or content of his thinking whatsoever.” Dr. LaWall
    indicated that Smith “probably functions in the average range
    of intelligence,” but probably has a personality disorder with
    both passive-aggressive and antisocial features.
    3. The Post-2005 Evaluations
    After our 2005 order, proceedings were commenced in
    the Arizona Superior Court, Pima County, for the sole
    purpose of complying with our order that the state court
    determine whether Arizona was prohibited from executing
    Smith in accordance with Atkins. The Superior Court noted
    that the burden was on Smith “to prove the claim of mental
    retardation by clear and convincing evidence” and that both
    parties acknowledged that the court was “bound to follow the
    decision of the Arizona Supreme Court in State v. Grell
    (Grell II), 
    212 Ariz. 516
    , 521, 
    135 P.3d 696
    , 701 (2006) in
    this regard.”
    Smith was subjected to testing and evaluations by experts
    retained by both Smith and Arizona. Testing in August 2005
    5
    Smith apparently complained of memory problems, but there was no
    evaluation for organic brain syndrome or seizure disorder.
    92                   SMITH V. SCHRIRO
    by Dr. Sergio Martinez, Arizona’s expert, resulted in a
    finding that Smith “had an IQ score of 93 on the WAIS-III
    and a score of 89 on a second test, the Slosson Intelligence
    Test - Revised, within the low-average to average range of
    intellectual ability.” Testing by Dr. Thomas Thompson,
    Smith’s expert, utilizing a different appropriate testing
    instrument, the Reynolds Intellectual Assessment Scale with
    subtests, resulted in a finding that Defendant, at the time of
    the testing, had a score of 93. Thus, both experts agree that
    as of 2005 Smith was not intellectually disabled.
    Dr. Thompson, however, was of the opinion that there
    was a “high probability” that Smith “was mentally retarded
    at the time the crime was committed in 1980, but that his
    functioning has improved as a result of his stable, structured
    prison life and appropriate medication.” Dr. Thompson relied
    heavily on the Otis test scores from 1964, the Stanford test
    scores, early grades and recollections by relatives and others
    concerning Smith’s childhood and early adolescence. Dr.
    Thompson appeared “to view mental retardation as a fluid
    condition responsive to any number of changes in a patient’s
    environment, nutrition, and physical, mental and emotional
    health.” He considered Smith’s low test scores, low grades,
    lack of social skills and other deficits as valid indicators of
    mental retardation.
    When asked about evidence of Smith’s intellectual
    disability in 1980, Dr. Thompson referred to the 1964 IQ tests
    and noted that the presentence evaluation indicated that he
    functioned in a borderline range. However, when informed
    of the two Rule 11 evaluations by Drs. Levy and LaWall, he
    acknowledged that he would have expected retardation to
    have been noted in their reports.
    SMITH V. SCHRIRO                             93
    Dr. Thompson described Smith’s life after he left school
    as “characterized by instability in employment, personal
    relationships and residence, and showed signs of impulsivity
    and deficits of adaptive functioning, all characteristic of
    mental retardation.” Nonetheless, he acknowledged that
    Smith “seemed to have some qualitative independent living
    skills.”6
    In contrast, Dr. Martinez, after giving Smith IQ tests and
    meeting with him, testified that there was a high degree of
    probability that he was not retarded at the time of the offense.
    He agreed that increases in intellectual functioning could
    occur within a highly enriched learning environment, but that
    a 30-point increase in IQ was unlikely and he did not view
    prison as an enriching environment.
    4. The Arizona Superior Court’s Decision
    On March 27, 2008, the Arizona Superior Court issued a
    19-page ruling that Smith had failed to show that he was
    intellectually disabled at the time of his trial and that Arizona
    was therefore not precluded by Atkins from executing him.
    The court first held that the parties agreed that the burden
    to prove intellectual disability was on Smith, pursuant to
    Grell 
    II, 212 Ariz. at 521
    . However, in view of the
    procedural differences between Grell II and Smith’s case, the
    6
    In reference to Smith’s prior 1970 hospitalization and diagnosis for
    personality disorder with psychotic features, Dr. Thompson
    “acknowledged that this disorder included features described as
    ‘inadequate and immature,’ and that this condition included anxiety and
    depression which could display the impulsivity causing the job changes
    and relationship issues characterizing Defendant’s early adulthood.”
    94                        SMITH V. SCHRIRO
    court “considered the evidence under the preponderance of
    evidence standard applicable to Rule 32 proceedings.” The
    court held that Smith had failed to show that he was entitled
    to relief under either the clear and convincing evidence
    standard or the preponderance of evidence standard.
    The trial court expressed serious concerns with Dr.
    Thompson’s perspective. It noted that his view of “mental
    retardation as a fluid condition responsive to any number of
    changes in a patient’s environment, nutrition, and physical,
    mental and emotional health,” was not necessarily consistent
    “with the definition of mental retardation provided by
    Arizona law, and the procedures by which mental retardation
    is to be determined under A. R. S. § 13-703.02.”7 The court
    further noted that Dr. Thompson placed considerable weight
    on the 1964 IQ tests and the pre-sentence report’s indication
    of Smith’s “borderline functioning.” It also observed that Dr.
    Thompson gave little weight to Smith’s ability to live on his
    own for 15 years between the time he left school and the
    murder. The court concluded that Dr. Thompson’s “analysis
    does not permit a finding, with any degree of accuracy, of
    Defendant’s level of ‘general intellectual functioning’ either
    7
    The state court commented:
    The State . . . contends that the family dysfunction and
    abuse, faulty nutrition, depression and anxiety rather
    than mental retardation contributed to the low test
    scores, low grades and other signs. In other words, the
    defense view is that Defendant’s early difficulties cause
    his retardation, and that he got better in prison. The
    prosecution’s perspective is that Defendant’s
    dysfunctional background and other mental health
    problems rather than mental retardation caused the
    factors pointed to by Dr. Thompson as diagnostic of
    retardation.
    SMITH V. SCHRIRO                     95
    before the age of 18, or in the period 1980–82.” Thus, his
    evaluation “does not support the conclusion that during the
    pertinent time period, Defendant was mentally retarded.”
    The Superior Court recognized that Smith’s
    “dysfunctional family and troubled early life undoubtedly
    affected his circumstances in an adverse way,” and that he
    likely “has suffered from clinically cognizable conditions
    probably including a personality disorder.” However, the
    circumstances “do not point to mental retardation with any
    degree of certainty.” Based on all the evidence the Superior
    Court found that:
    Defendant has failed to meet his burden of
    showing that he was mentally retarded at the
    time of the offense and trial in this case.
    There was insufficient evidence from which
    this Court could find that Defendant exhibited
    “significantly subaverage general intellectual
    functioning” during the period of the offense
    and his trial. While unorthodox and unstable,
    Defendant’s pre-arrest life did not show
    “significant impairment in adaptive behavior”
    existing concurrently with the deficit in
    general intellectual functioning.      In the
    absence of adequate information concerning
    the early Otis IQ tests, and in view of the
    alternative explanations for his early school
    and social deficits, Defendant failed to show
    the onset of mental retardation before the age
    of 18. The Court therefore FINDS that the
    State of Arizona is not precluded, on Atkins
    grounds from executing Defendant.
    96                     SMITH V. SCHRIRO
    5. The Arizona Court of Appeals’ Opinion
    Smith appealed to the Arizona Court of Appeals, which
    unanimously affirmed the Superior Court. Smith v. Kearney,
    No. 2CA-SA-2008-0019, 
    2008 WL 2721155
    (Ariz. App. Jul.
    11, 2008). It noted that the trial court “had considered the
    evidence under the applicable clear-and-convincing standard
    as well as under the lesser burden of a preponderance of the
    evidence standard that applies to post-conviction
    proceedings.” The appellate court reviewed the evidence and
    the Superior Court’s decision noting that the trial court had
    found: (a) Dr. Thompson’s opinion was based on an approach
    to defining mental retardation that was inconsistent with the
    requirements of Arizona law; (b) lay witness Martha Hight’s
    opinion that Smith was mentally retarded was inconsistent
    with the testimony of witnesses who had lived with Smith in
    the 1970’s; and (c) Smith’s own written statements were
    “lengthy, neatly written, logical, detailed, structured and
    coherent.” The appellate court concluded that the Superior
    Court had carefully considered all the evidence and
    “exercised its discretion in resolving conflicts in the evidence,
    in assessing the reliability of the test results, and credibility
    of the witnesses, and in weighing evidence.” The court
    concluded that it had no basis for interfering with the
    Superior Court’s discretionary judgments or for re-weighing
    the evidence.8
    6. The District Court’s Order Denying Habeas Relief
    Following the conclusion of his state court proceedings,
    Smith renewed his proceedings in the United States District
    8
    The Arizona Supreme Court summarily denied Smith’s petition for
    review.
    SMITH V. SCHRIRO                              97
    Court for the District of Arizona. In a 21-page order issued
    on December 3, 2012, the court found that Smith’s Atkins
    related claims were without merit.
    The court recognized that because Smith filed his initial
    federal habeas petition prior to AEDPA’s effective date, pre-
    AEDPA standards applied. Accordingly, the court reviewed
    de novo mixed questions of law and fact as well as pure
    questions of law. See Robinson v. Schriro, 
    595 F.3d 1086
    ,
    1099 (9th Cir. 2010). However, the court held, citing
    Robinson, that the state court factual findings were entitled to
    a presumption of correctness, subject to eight exceptions
    enumerated in the previous version of 28 U.S.C. § 2254(d).9
    9
    The district court listed the exceptions as:
    (1) that the merits of the factual dispute were not
    resolved in the State court hearing;
    (2) that the factfinding procedure employed by the State
    court was not adequate to afford a full and fair hearing;
    (3) that the material facts were not adequately
    developed at the State court hearing;
    (4) that the State court lacked jurisdiction of the subject
    matter or over the person of the applicant in the State
    court proceeding;
    (5) that the applicant was an indigent and the State
    court, in deprivation of his constitutional right, failed to
    appoint counsel to represent him in the State court
    proceeding;
    (6) that the applicant did not receive a full, fair and
    adequate hearing in the State court proceeding; or
    98                        SMITH V. SCHRIRO
    The district court, citing Marshal v. Lonberger, 
    459 U.S. 422
    ,
    432 (1983), held that before it could reject a state court’s
    factual determination it would have to conclude “that the state
    court’s findings lacked even fair support in the record.” It
    further determined that whether Smith “is mentally retarded
    is a question of fact.”
    The district court noted that Smith did not dispute that the
    state court’s finding as to intellectual disability was entitled
    to a presumption of correctness.10 The district court
    (7) that the applicant was otherwise denied due process
    of law in the State court proceeding;
    (8) or unless . . . the Federal court on consideration of
    [the relevant] part of the record as a whole concludes
    that such factual determination is not fairly supported
    by the record.
    28 U.S.C. § 2254(d) (1994).
    10
    Smith nonetheless sought de novo review for at least one of four
    grounds: “(1) an inadequate factfinding procedure by the state court;
    (2) the failure to adequately develop material facts at the state court Atkins
    hearing; (3) the failure to provide Petitioner a full, fair and adequate
    hearing; and (4) a violation of Petitioner’s due process rights.” The
    district court rejected Smith’s claim to a right to funding for a Positron
    Emission Tomography (PET) scan and his assertion that he was entitled
    to jury determination on mental retardation. The majority opinion does
    not discuss either of these claims. Rejecting Smith’s other grounds, the
    district court noted that the “state court provided a lengthy period of time
    for Petitioner to prepare for the Atkins hearing and authorized Petitioner’s
    expert of choice, his initial diagnostic testing requests, investigative
    resources, and numerous depositions of lay witnesses.” It noted that
    Smith “identifies nothing to support a finding that the state court’s
    factfinding procedures were inadequate, that material facts were left
    undeveloped, that the state court failed to provide a full and fair hearing,
    or that his due process rights were violated. Accordingly, the district court
    SMITH V. SCHRIRO                            99
    concluded that there was ample evidence in the record to
    support the state court’s conclusion that Smith had failed to
    establish either “subaverage general intellectual functioning”
    or “significant impairment in adaptive behavior” before the
    age of 18. In particular, the district court agreed that the 1964
    Otis tests were unreliable and entitled to little weight. It
    noted that the record was “devoid of any evidence concerning
    the testing, including the raw test data, identification of the
    administrators and their qualifications, or the protocols
    followed.” Moreover, both Drs. Thompson and Martinez
    testified that the Otis test was outdated when administered to
    Smith in 1964 and would not be used today to determine an
    individual’s IQ.
    The district court further commented:
    [A]s noted by the state court, the evidence
    presented at the hearing indicated it is just as
    likely that Petitioner’s poor school
    performance and unstable lifestyle was the
    result of a severely dysfunctional upbringing
    and personality disorder as it was mental
    retardation. Petitioner led a transient lifestyle,
    frequently changing employment and
    residences, but many of his jobs (such as
    being a mechanic, a cable installer, and a
    truck driver) required at least a minimal
    degree of intellectual functioning. Although
    witnesses agreed that Petitioner is not “book
    smart,” he learns quickly when shown how to
    do something. In addition, the record
    found that Smith had not overcome the presumption of correctness on any
    of these grounds.
    100                   SMITH V. SCHRIRO
    supports a finding that Petitioner began living
    an independent life after dropping out of
    school at age 16 and was not dependent on
    others to function in his daily life.
    The district court concluded that Smith had not overcome the
    presumption of correctness that attached to the state court’s
    finding that he was not intellectually disabled at the time of
    the offense.
    B. Analysis
    The majority does not question the adequacy of the state
    court’s proceedings. Instead, invoking the eighth exception
    enumerated under the 1994 version of § 2254(d), it concludes
    that the state court’s findings are “not fairly supported by the
    record.” Op. 11. This is simply wrong. An objective review
    of the conflicting evidence reveals that there is substantial un-
    refuted evidence supporting the state court’s determination
    that Smith was not intellectually disabled in 1980. The
    majority’s preference for Dr. Thompson’s perspective does
    not justify its setting aside all the evidence—including
    portions of Dr. Thompson’s testimony—that supports the
    determinations by the state court and the district court that
    Smith has not demonstrated that he was intellectually
    disabled in 1980.
    First, the majority cannot deny that as of 2005, Smith was
    not intellectually disabled. Even Dr. Thompson’s test
    indicated that Smith had an IQ of 93. Thus, this case is
    relatively unique in that the courts are required to determine
    whether a person who now is clearly not intellectually
    disabled, was intellectually disabled some 25 years earlier
    when he committed a murder and was tried. The fact that
    SMITH V. SCHRIRO                           101
    Smith was not intellectually disabled in 2005, gives rise to at
    least a presumption that Smith was not intellectually disabled
    in 1980.
    Second, the evidence supporting the majority’s
    determination is inherently problematic. Smith’s 1964 IQ
    tests, his poor performance on the Stanford achievement tests,
    and his poor grades could be signs of intellectual disability.
    But the test administered in 1964 was out-moded and there is
    nothing in the record as to how the test was administered.
    Also, by the time that the test was administered, Smith had
    failed in school, and there is nothing to suggest that he made
    any effort to perform well on the test.11 Moreover, there is
    substantial evidence that Smith had difficulty with the written
    word, which indicates that his written test results were likely
    to underrate his intelligence.
    Other than the test scores and his academic performance,
    the evidence of Smith’s alleged intellectual disability is
    primarily the testimony of lay witness Martha Hight who
    compared Smith to her sister who had been diagnosed as
    intellectually disabled. However, the trial court found that
    her statement “was inconsistent with the testimony of others
    who lived with [Smith] at or near the same period of time in
    the 1970’s.”
    There was evidence, as the majority notes, of Smith’s
    horrendous childhood. That his stepfather frequently belittled
    him and beat him. That his mother frequently ignored her
    11
    Dr. Martinez testified as to the importance of an awareness of an
    individual’s behavior during an assessment. He noted that in a group-
    administered test you don’t have the ability to “directly assess how the
    individual is doing, whether they’re paying attention or not.”
    102                   SMITH V. SCHRIRO
    children and was promiscuous in front of them. See Op.
    24–25. This upbringing, the majority notes, led Dr.
    Thompson to opine that Smith “became intellectually
    disabled with frontal lobe abnormalities.” Op. 25.
    But it is Dr. Thompson’s view of intellectual disability
    “as a fluid condition responsive to any number of changes in
    a patient’s environment, nutrition and physical, mental and
    emotional health” that renders his diagnosis problematic. If
    a person’s mental ability is fluid, if it can change in response
    to changes in the person’s environment, nutrition, and
    physical, mental and emotional health, then by definition,
    even assuming that Smith was intellectually disabled in 1964,
    when he was 16 years old, he was not necessarily disabled in
    1980, when he committed the murder.
    Critically, by 1980, Smith had lived independently for 15
    years, had been married a number of times, and had held
    numerous jobs. This inherently raises questions as to
    whether, assuming that Smith was intellectually disabled in
    1964, the subsequent improvement of his mental ability was
    due to his living alone away from his oppressive family for
    15 years, as Dr. Martinez suggests, or to his being in prison
    from 1980 to 2005, as Dr. Thompson suggests. Smith’s
    independent life from 1964 to 1980 is strong circumstantial
    evidence that by 1980 he was not intellectually disabled, even
    if he had been intellectually disabled in 1964.
    In addition, Dr. Thompson’s perception of intellectual
    disability is in tension with Arizona’s definition. Arizona’s
    statute assumes that a person’s intellectual ability is relatively
    stable. See Ariz. Rev. Stat. Ann. § 13-703.02(K)(3). In fact,
    the statute requires that the onset of intellectual disability be
    before an individual is 18 years of age. Dr. Thompson’s
    SMITH V. SCHRIRO                      103
    approach begs the question of whether Smith was
    intellectually disabled as defined by Arizona when he was 16,
    or only suffered from “frontal lobe abnormalities” that
    affected his performance but cleared up once he was in a less
    toxic environment. It is not clear that the alleged “frontal
    lobe abnormalities” resulted in “significant subaverage
    intellectual functioning” or caused “significant impairment of
    adaptive behavior” as required by the Arizona statute. See
    A. R. S. § 13-703.02 (K).
    In any event, the critical issue here is not whether Smith
    was intellectually disabled in 1964, but in 1980. Dr.
    Martinez’s perspective that Smith was never disabled is
    certainly supported by the 2005 IQ tests. Dr. Thompson’s
    suggestion that Smith was disabled in 1980 depends first on
    a determination that Smith was disabled in 1964 and second
    on the acceptance that prison rather than 15 years of living
    alone, explains Smith’s present IQ level. However, as noted,
    Smith’s ability to live on his own for 15 years from 1964 to
    1980 is strong evidence that even if Smith had developed
    “frontal lobe abnormalities” as a result of his horrendous
    childhood, they had dissipated by 1980. Moreover, this
    conclusion is supported by the fact that the two doctors who
    examined Smith for competency to stand trial for the murder
    in 1980 failed to detect any signs of intellectual disability.
    Even Dr. Thompson admitted that he would have expected
    the doctors to note some sign of intellectual disability.
    In sum, there is substantial—if not overwhelming—
    evidence to support the state court’s determination that Smith
    had failed to demonstrate that he was intellectually disabled
    in 1980. Indeed, the majority does not really try to refute this
    evidence. Instead, it explains at length why it prefers Dr.
    Thompson’s perspective to that of Dr. Martinez. But that is
    104                       SMITH V. SCHRIRO
    not the proper inquiry. The question is whether the state
    court’s factual determination is “fairly supported by the
    record.” 
    Marshal, 459 U.S. at 432
    . Perhaps if all the
    conflicting evidence could be explained away, the majority’s
    approach might be acceptable. But the evidence remains
    obstinate in support of the state court’s determinations: Smith
    is not now intellectually disabled, he lived independently for
    15 years before he committed the murder, and the doctors
    who examined him for competency in 1980 failed to detect
    any signs of intellectual disability. Moreover, although Dr.
    Thompson offers an explanation for how Smith’s mental
    ability could change over time, his own theory cannot
    pinpoint when Smith overcame his alleged initial intellectual
    disability. The factual record fully supports the state court’s
    determinations that Smith failed to carry his burden, and that,
    accordingly, he was not intellectually disabled in 1980.
    In addition, the Supreme Court’s recent opinion in Hall v.
    Florida, 
    134 S. Ct. 1986
    (2014), supports the denial of relief.
    The Supreme Court was critical of Florida’s over-reliance on
    the measurement of an IQ test.12 It concluded that
    “[i]ntellectual disability is a condition, not a number.” 134 S.
    12
    The Court explained:
    Florida’s rule disregards established medical practice in
    two interrelated ways. It takes an IQ score as final and
    conclusive evidence of a defendant’s intellectual
    capacity, when experts in the field would consider other
    evidence. It also relies on a purportedly scientific
    measurement of the defendant’s abilities, his IQ score,
    while refusing to recognize that the score is, on its own
    terms, 
    imprecise. 134 S. Ct. at 1995
    .
    SMITH V. SCHRIRO                            105
    Ct. at 2001. It held that courts “must recognize, as does the
    medical community, that the IQ test is imprecise.13 
    Id. The Supreme
    Court concluded:
    Florida’s rule is in direct opposition to the
    views of those who design, administer, and
    interpret the IQ test. By failing to take into
    account the standard error of measurement,
    Florida’s law not only contradicts the test’s
    own design but also bars an essential part of a
    sentencing court’s inquiry into adaptive
    functioning. Freddie Lee Hall may or may
    not be intellectually disabled, but the law
    requires that he have the opportunity to
    present evidence of his intellectual disability,
    including deficits in adaptive functioning over
    his lifetime.
    
    Id. Here, Smith
    had precisely this opportunity. He had a full
    “opportunity to present evidence of his intellectual disability,
    13
    The Court continued:
    This is not to say that an IQ test score is unhelpful. It
    is of considerable significance, as the medical
    community recognizes. But in using these scores to
    assess a defendant’s eligibility for the death penalty, a
    State must afford these test scores the same studied
    skepticism that those who design and use the tests do,
    and understand that an IQ test score represents a range
    rather than a fixed 
    number. 134 S. Ct. at 2001
    .
    106                      SMITH V. SCHRIRO
    including deficits in adaptive functioning over his lifetime.”
    
    Id. However, the
    state courts and the district court concluded
    that the evidence did not show that he was intellectually
    disabled in 1980. It is the majority and Dr. Thompson who
    cling to the 1964 test results. But other evidence such as
    Smith’s 2005 IQ test results, his living independently on his
    own for 15 years before the murder, and the failure of the
    doctors who examined Smith for mental competence in 1980
    to detect any sign of intellectual disability, strongly support
    the state court’s determination.14
    Accordingly, because the district court’s denial of Smith’s
    petition should be affirmed, I dissent from the majority’s
    opinion.
    14
    Finally, it should be noted that the Supreme Court in Hall considered
    the Arizona’s statute and suggested that it passed constitutional muster.
    Arizona’s statute appears to set a broad statutory cutoff
    at 70, Ariz. Rev. Stat. Ann. § 13–753(F) (West 2013),
    but another provision instructs courts to “take into
    account the margin of error for a test administered.” 
    Id. at §
    14–753(K)(5). How courts are meant to interpret
    the statute in a situation like Hall’s is not altogether
    clear. The principal Arizona case on the matter, State v.
    Roque, 
    213 Ariz. 193
    , 
    141 P.3d 368
    , (2006), states that
    “the statute accounts for margin of error by requiring
    multiple tests,” and that “if the defendant achieves a
    full-scale score of 70 or below on any one of the tests,
    then the court proceeds to a hearing.” 
    Id. at 403.
    134 S. Ct. at 1996.
    SMITH V. SCHRIRO                     107
    II. The Arizona Courts Applied the Appropriate
    Standard of Proof.
    A. The Superior Court’s Use of the Words “with any
    degree of certainty” Does Not in Any Way Suggest
    that it Applied an Inappropriate Standard of
    Proof.
    Despite the lack of any concurrence, Judge Reinhardt
    includes in his opinion an argument that the Arizona courts
    applied an unconstitutional standard of proof. Section II C.2,
    pages 42–52. Accordingly, I offer the following rebuttal to
    his inaccurate accusations.
    1. The State Court and District Court Decisions
    As noted, the Arizona Superior Court held extensive
    hearings and admitted considerable evidence as to whether
    Smith was intellectually disabled at the time of his trial. It
    agreed with the parties that the burden to prove intellectual
    disability was on Smith, pursuant to Grell II, 
    212 Ariz. 515
    .
    However, in view of the procedural differences between Grell
    II and Smith’s case, the court “considered the evidence under
    the preponderance of evidence standard applicable to Rule 32
    proceedings.” The court held that its decision was the same
    under this lower standard.
    After carefully considering all the evidence, the Superior
    Court concluded:
    Although Defendant’s dysfunctional family
    and troubled early life undoubtedly affected
    his circumstances in an adverse way, and
    while it is likely Defendant has suffered from
    108                 SMITH V. SCHRIRO
    clinically cognizable conditions probably
    including a personality disorder, the
    circumstances described at the hearing do not
    point to mental retardation with any degree of
    certainty. The Court has carefully considered
    all of the testimony presented at the hearing,
    and has reviewed and considered all of the
    exhibits received in evidence at that
    proceeding. Based on all of the evidence, the
    Court FINDS that Defendant has failed to
    meet his burden of showing that he was
    mentally retarded at the time of the offense
    and trial in this case. There was insufficient
    evidence from which this Court could find
    that Defendant exhibited “significant
    subaverage general intellectual functioning”
    during the period of the offense and his trial.
    While unorthodox and unstable, Defendant’s
    pre-arrest life did not show “significant
    impairment in adaptive behavior” existing
    concurrently with the deficit in general
    intellectual functioning. In the absence of
    adequate information concerning the early
    Otis IQ tests, and in view of the alternative
    explanations for his early school and social
    deficits, Defendant failed to show the onset of
    mental retardation before the age of 18. The
    Court therefore FINDS that the State of
    Arizona is not precluded, on Adkins grounds,
    from executing Defendant.
    The Arizona Court of Appeals affirmed the Superior
    Court. It noted that the trial court “had considered the
    evidence under the applicable clear-and-convincing evidence
    SMITH V. SCHRIRO                     109
    standard as well as under the lesser burden of a
    preponderance of the evidence that applies to post conviction
    proceedings . . . and concluded that under either standard
    Smith had failed to establish he was mentally retarded at the
    time of the offense and at trial.”
    Similarly, the district court denied Smith’s petition. It
    noted that although Smith did not “identify deficiencies in the
    state court’s ruling,” he contended that his proffered evidence
    “overwhelmingly established the subaverage intellectual
    functioning and adaptive skills prongs of Arizona’s mental
    retardation test as of the time of the offense in 1980.” The
    district court rejected this contention. It noted that Smith did
    not dispute that the 1964 Otis tests were unreliable, and
    commented that “the evidence presented at the hearing
    indicated it is just as likely that Petitioner’s poor school
    performance and unstable lifestyle was the result of a
    severely dysfunctional upbringing and personality disorder as
    it was mental retardation.” The district court concluded that
    there was “ample evidence in the record to support the state
    courts’ conclusion that Petitioner failed to establish either
    ‘subaverage general intellectual functioning’ or ‘significant
    impairment in adaptive behavior’ before the age of 18.”
    Accordingly, he had “not overcome the presumption of
    correctness attached to the state court’s finding that he was
    not mentally retarded.” Moreover, in denying a certificate of
    appealability the district court found “that reasonable jurists
    could not debate its resolution of Petitioner’s Atkins-related
    claims,” and that “[t]he question of whether the state court
    erred in finding that Petitioner was not mentally retarded
    under Arizona law is not debatable among jurists of reason.”
    110                       SMITH V. SCHRIRO
    2. Discussion
    In light of the unanimous perspective of the Arizona trial
    and appellate courts and the district court, how does Judge
    Reinhardt conclude that the Superior Court applied an
    unconstitutional standard of proof? His concurrence does so
    by first disbelieving the state courts’ statements that the
    Superior Court applied the preponderance of the evidence
    standard. Second, the concurrence ignores the court’s factual
    findings and misconstrues the Superior Court’s statement that
    “the circumstances described at the hearing do not point to
    mental retardation with any degree of certainty.” See Op. 43.
    Thus, the concurrence takes five words from the trial court’s
    decision out of context and then gives them an improper
    definition. By attacking this incorrect definition, the
    concurrence, in essence, argues that the death penalty cannot
    be constitutionally applied.15
    Both the Superior Court and the Arizona Court of
    Appeals stated that the Superior Court applied the lesser
    preponderance of the evidence standard. The concurrence
    dismisses their considered opinions in a footnote arguing that
    the body of the Superior Court’s opinion “did not fulfill that
    promise, however, but, rather, the court concluded after
    reviewing all the evidence that it did not meet a ‘certainty’
    standard.” Op. 43 n.25. This is wrong on a number of levels.
    The concurrence takes “with any degree of certainty” out
    of context, endows it with a incorrect meaning and then
    argues that the stilted meaning it has conjured up is
    15
    Although Judge Reinhardt specifically addresses the constitutionality
    of the Arizona death penalty statute in his separate concurrence, its spirit
    clearly informs his concurrence set forth in the majority opinion.
    SMITH V. SCHRIRO                           111
    unconstitutional. But, considering the factual evidence in this
    case, an objective jurist must admit to the lack of some
    precision in an evaluation of Smith’s intellectual ability in
    1980. On the one hand, there are the Otis IQ tests from 1964
    and Dr. Thompson’s testimony that Smith’s intellectual
    disability was not a constant. On the other hand, both Dr.
    Thompson and Dr. Martinez agreed that by 2005 Smith was
    not intellectually disabled, and there is evidence that for some
    15 years after dropping out of school, and before committing
    the murder, Smith lived independently and was not dependent
    on anyone. Thus, given that Smith had the burden to prove
    an intellectual disability, the Superior Court reasonably
    concluded that he had failed to do so, even by a
    preponderance of the evidence. In other words, the evidence
    as presented by Smith did not “point to mental retardation
    with any degree of certainty.” Both the Arizona Court of
    Appeals and the District Court agreed.
    But the concurrence eschews the trial court’s intent and
    suggests that “the ‘any degree of certainty’ standard . . . is
    more akin to the ‘reasonable doubt’ standard than the clear
    and convincing standard mandated by Arizona’s Atkins
    statute, which requires only that the issue under consideration
    be ‘highly probable.’”16 Op. 44. In support of this assertion,
    the concurrence cites a 27-year old Arizona case that
    involved a jury instruction. State v. King, 
    763 P.2d 239
    (Ariz.
    1988). This case, which affirmed placing the burden on the
    defendant to prove insanity, disapproved defining “clear and
    convincing evidence” as evidence that “is certain, plain to the
    16
    Of course, this argument is only relevant if one ignores the trial
    court’s determination, affirmed by the state court of appeals, that Smith
    had failed to demonstrate an intellectual disability by the preponderance
    of the evidence.
    112                      SMITH V. SCHRIRO
    understanding, unambiguous, and convincing in the sense that
    it is so reasonable and persuasive as to cause you to believe
    it.” 
    Id. at 241.
    The court held that “the better instruction
    would inform a jury that clear and convincing evidence is
    evidence that makes the existence of the issue propounded
    highly probable.” 
    Id. at 244.
    In Smith’s proceedings, no court used the definition of
    clear and convincing evidence disapproved in King. Indeed,
    our precedent requires that we presume that the state judges
    know and follow the law. See Lopez v. Schriro, 
    491 F.3d 1029
    , 1043 (9th Cir. 2007). We have further held that we
    should not lightly disregard the trial court’s determinations.
    
    Id. In Parker
    v. Dugger, 
    498 U.S. 308
    , 315 (1991), the
    Supreme Court held “[w]e must assume that the trial judge
    considered all this [mitigation] evidence before passing
    sentence. For one thing, he said he did.” Thus, we have no
    basis for finding that the Superior Court did not apply the
    preponderance of the evidence standard that it said it did (and
    which the Arizona Court of Appeals affirmed) or that the
    Superior Court somehow applied “certainty” in a way that has
    been improper in Arizona since King was decided in 1988.
    Furthermore, even if there were some ambiguity in the
    Superior Court’s decision—which there is not—we would
    still have to construe any ambiguity in the language in the
    state court’s favor. See Woodford v. Visciotti,. 
    537 U.S. 19
    ,
    24 (2002) (“This readiness to attribute error is inconsistent
    with the presumption that state courts know and follow the
    law”).17 Indeed, the Supreme Court has indicated that we
    17
    Although Woodford concerned review under AEDPA, the Supreme
    court indicated, citing 
    Parker, 498 U.S. at 314
    –16, and other cases, that
    the presumption that state courts know and follow the law was established
    SMITH V. SCHRIRO                       113
    should not “demand a formulary statement” by state courts.
    Early v. Packer, 
    537 U.S. 3
    , 9, (2002) (per curiam) (an
    AEDPA case, but citing a pre-AEDPA decision, Lowenfield
    v. Phelps, 
    484 U.S. 231
    , (1988), in support of its admonition).
    Thus, the concurrence’s approach goes against both Supreme
    Court and Ninth Circuit case law when it not only construes
    the trial court’s clear language as ambiguous, but then
    interprets the ambiguity as reflecting an unconstitutional
    standard.
    The concurrence then proceeds to argue that Atkins
    proceedings are different. “Consequently, where a state court
    analyzing an Atkins claim fails to follow binding state law, its
    decision does not simply violate state law, but also violates
    the Eighth Amendment right provided by Atkins and the
    violation is therefore cognizable by a federal habeas court.”
    Op. 44. Again relying on its stilted definition of “certainty,”
    the concurrence asserts:
    Here, the “certainty” standard applied by the
    state trial court was plainly contrary to the
    clear and convincing standard required by
    Arizona’s statute and adopted by its supreme
    court. See Ariz. Rev. Stat. Ann. § 13-
    703.02(G); Grell 
    II, 135 P.3d at 701
    (“The
    statute places on ‘the defendant . . . the burden
    of proving mental retardation by clear and
    convincing evidence’ in the pretrial hearing.”
    (quoting § 13-703.02(G)) (alteration in
    original)). Accordingly, the standard of proof
    applied by the state trial court was not simply
    before the enactment of AEDPA and thus applies to pre-AEDPA cases.
    
    Woodford, 537 U.S. at 24
    .
    114                   SMITH V. SCHRIRO
    contrary to state law but was also
    unconstitutional under Atkins, see Williams,
    
    2015 WL 4079430
    , at *4; 
    Black, 664 F.3d at 97
    , and, accordingly, the state court’s findings
    are not due any deference. See 
    Lafferty, 949 F.2d at 1551
    n. 4; 
    Walker, 167 F.3d at 1345
    .
    But this is not right. First, as noted, the state court
    applied the less demanding preponderance of the evidence
    test. Second, there is nothing in either the trial court’s
    decision or the state appellate court’s memorandum
    disposition that suggests that either court defined “certainty”
    in a way that violated King, 
    736 P.2d 239
    . Third, Grell II,
    which the majority cites, affirms that Smith had the burden of
    proving mental retardation by clear and convincing evidence.
    Fourth, a review of the record in this case fully supports the
    Superior Court’s factual determination that Smith had failed
    either by clear and convincing evidence or a preponderance
    of the evidence to show that he was intellectually disabled at
    the time of the crime and his trial. Cherry-picking words
    from the trial court’s decision and then giving them an
    incorrect meaning does not undermine the clear logic of the
    decision as affirmed by the state appellate court.
    Perhaps aware that its first argument is less than
    persuasive, the concurrence offers a second argument: that
    “the standard of proof applied by the state trial court is
    unconstitutional.” Op. 45. Again, based largely on its
    incorrect definition of “certainty,” the concurrence asserts
    that “a ‘certainty’ standard of proof transgresses the limits of
    the state’s authority to craft appropriate procedures to enforce
    Atkins and, in doing so, encroaches on the substantive
    constitutional right.” Op. 45.
    SMITH V. SCHRIRO                            115
    This argument appears, in essence, to be an argument
    against the constitutionality of the death penalty. The
    majority claims that it does not “need to determine what
    standard of proof the federal Constitution requires,” but “only
    whether the Arizona court applied a standard it forbids.” Op.
    45. It posits that “[w]hen the natural operation of a state’s
    procedures for rendering factual determinations transgresses
    a substantive constitutional right, those procedures are
    unconstitutional.” Op. 46. The concurrence argues that “[i]t
    is elementary that the ‘natural operation’ of applying a
    heightened standard of proof can determine the outcome of
    litigation, and thus the availability of a constitutional right.”18
    Op. 46.
    The concurrence next objects to the death penalty based
    on the “inherent imprecision of psychiatric determinations of
    mental illness.” Op. 49. Citing Addington v. Texas, 
    441 U.S. 418
    , 430–32 (1979), it comments: “[a]s the Supreme Court
    explained in rejecting the argument that the Constitution
    requires use of a reasonable doubt standard in the context of
    civil commitment proceedings, the unique nature of
    psychiatric diagnosis renders factual determinations uniquely
    unsusceptible to certainty.” Op. 47. The concurrence posits
    that when, as in this case, the determination of an individual’s
    intellectual ability at the time of the crime is not made until
    years after the crime, certainty is “even less attainable and a
    18
    The concurrence’s authority for these assertions is a 1911 Supreme
    Court opinion, Bailey v. Alabama, 
    219 U.S. 219
    (1911), which held that
    an Alabama statute that created a presumption of intent to injure violated
    the 13th Amendment.
    116                         SMITH V. SCHRIRO
    certainty standard is even less constitutionally acceptable in
    such cases.”19 Op. 49–50.
    The concurrence concludes with the assertion that capital
    punishment requires a “heightened degree of certainty.” Op
    50.     Accordingly, “where, as in Atkins, the Eighth
    Amendment renders a class of individuals categorically
    ineligible for execution, the procedures used to determine
    whether a defendant falls into that class may not allocate
    nearly all of the risk of an erroneous determination to the
    defendant.” Op. 51. It reasons that by requiring Smith to
    demonstrate with a “degree of certainty” that he was
    intellectually disabled, the Arizona court allocated “nearly the
    19
    In footnote 26, the concurrence asserts:
    It is of no consequence to the analysis that Addington
    and Atkins involve different burdens of proof than the
    case at bar, because the focus here is on the effect of the
    standard of proof. Under Addington, a state desiring
    the civil commitment of an individual must demonstrate
    that he suffers from mental illness, whereas under
    Atkins an individual seeking to avoid execution by the
    state must demonstrate intellectual disability. In both
    situations, the determination heavily relies upon
    psychiatric opinion, and thus in both situations a
    standard of proof requiring “any degree of certainty” as
    defined by Arizona law will often render it impossible
    for a party to carry its burden. See 
    Addington, 441 U.S. at 432
    .
    Again, this argument is based on the concurrence’s misinterpretation of
    the trial court’s decision. Deciding whether a person has carried his
    burden of showing an intellectual disability may well be difficult, but here
    the state court carefully did so. Indeed, it is telling that the majority
    attacks the decision by giving the words “any degree of certainty” a
    meaning that they do not have.
    SMITH V. SCHRIRO                     117
    entire risk of an erroneous determination to Smith.” Op. 51.
    Thus, according to the concurrence, because “the factual
    determination in question concerned an issue for which
    certainty may be unattainable . . . and a penalty for which a
    greater degree of reliability is required . . . [,] the
    constitutional violation [is] even more clear.” Op. 51–52.
    Judge Reinhardt is certainly entitled to his opinion, but it
    is not the opinion of the panel or of the Ninth Circuit. The
    concurrence is clearly contrary to the position of the Arizona
    Supreme Court. State v. Grell (Grell III), 
    135 P.3d 696
    , 702
    (Ariz. 2006) (en banc) (“We find no constitutional bar to
    imposing the burden of proving mental retardation on the
    defendant.”). The concurrence cites no Ninth Circuit case to
    support its perspective. And it is not supported by any
    decision by the United States Supreme Court, which denied
    certiorari in Grell II (Grell v. Arizona, 
    127 S. Ct. 2246
    (2007)), and accepted certain provisions of Arizona’s
    proceedings in 
    Hall, 134 S. Ct. at 1996
    –97.
    In sum, the assertion that the Arizona courts applied an
    unconstitutional standard of proof fails first because it
    misconstrues the Arizona Superior Court’s decision, and
    ignores the ruling of the Arizona Court of Appeals, contrary
    to both Supreme Court and Ninth Circuit precedent. See
    
    Woodford, 537 U.S. at 24
    ; 
    Parker, 498 U.S. at 315
    ; 
    Lopez, 491 F.3d at 1043
    (stating “there are ways to construe the state
    court’s ruling that would not make it ‘clearly untenable,’ and
    we are therefore bound by the state courts’ interpretation and
    application of its own procedural rules.”). The second arrow
    in the concurrence’s quiver—that there is not sufficient
    certainty to impose the death penalty on Smith—similarly
    lacks support from either the Supreme Court or the Ninth
    Circuit, as Arizona’s placement of the burden on the
    118                  SMITH V. SCHRIRO
    defendant to prove his intellectual disability has not been
    disturbed in the eight years that have passed since the Arizona
    Supreme Court decided Grell II in 2007.
    III.    Conclusion
    The district court’s denial of the Smith’s petition should
    be affirmed because an objective review of the extensive
    record reveals that there is substantial evidence, if not
    overwhelming evidence, that Smith failed to meet his burden
    of showing that he was intellectually disabled in 1980–82,
    when he murdered Sandy Owen and was tried, convicted and
    sentenced. At a minimum, this conclusion is compelled by
    the undeniable facts that: (a) Smith in 2005 had an IQ
    between 87 and 93; (b) Smith lived independently and
    supported himself for 15 years after he dropped out of school
    and before the murder; and (c) the doctors who examined
    Smith in 1980 to determine his competency to be tried found
    no signs of intellectual disability. Furthermore, Dr.
    Thompson’s approach of considering intellectual ability to be
    fluid, while allowing for Smith’s alleged intellectual
    disability to dissipate, offers no assurance as to when it did
    so. The state courts took Smith’s claim of intellectual
    disability seriously, and gave his assertions and the evidence
    full consideration. An objective review of this record will not
    support a finding—and certainly not a finding by this court on
    review of a state habeas petition—that Smith met his burden
    of showing that he was intellectually disabled in 1980. I
    SMITH V. SCHRIRO                              119
    would affirm the district court’s denial of Smith’s petition20
    and I therefore dissent.
    20
    I would also affirm the district court’s holding that Smith has failed
    to demonstrate cause to overcome his procedural default of his ineffective
    assistance of counsel claim. His invocation of Martinez v. Ryan, 132 S.
    Ct. 1309 (2012) fails because he has not demonstrated ineffective
    assistance of counsel in his first state post-conviction proceeding, and
    even if he did, this would not excuse Smith’s new counsel from raising
    ineffective assistance of trial counsel in Smith’s second state post-
    conviction proceeding. Moreover, Smith has not shown a reasonable
    probability that he received ineffective assistance of counsel at sentencing.
    See Strickland v. Washington, 
    466 U.S. 668
    (1984). Smith’s other
    arguments are unavailing. He fails to demonstrate the existence of a
    conflict of interest pervading the Pima County Public Defender’s Office;
    the state habeas court’s denial of a psychological exam does not provide
    cause for his procedural default; and to the extent that his claim was not
    covered by Stewart v. Smith, 
    536 U.S. 856
    , 860–61 (2002), the state
    court’s application of its post-conviction waiver rule is adequate and
    independent.