William Wiley v. Christopher Epps, Commissioner ( 2010 )


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  •                REVISED NOVEMBER 17, 2010
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE FIFTH CIRCUIT   United States Court of Appeals
    Fifth Circuit
    FILED
    October 27, 2010
    No. 09-70037
    Lyle W. Cayce
    Clerk
    WILLIAM WILEY,
    Petitioner-Appellee
    v.
    CHRISTOPHER B EPPS, MISSISSIPPI DEPARTMENT OF
    CORRECTIONS,
    Respondent-Appellant
    Appeal from the United States District Court
    for the Northern District of Mississippi
    Before KING, JOLLY, and DAVIS, Circuit Judges.
    KING, Circuit Judge:
    This is a capital case in which the district court granted habeas relief in
    favor of Petitioner-Appellee William Wiley, holding that Wiley is ineligible for
    a death sentence because he is mentally retarded as contemplated by Atkins v.
    Virginia, 
    536 U.S. 304
     (2002).     The State of Mississippi, acting through
    Respondent-Appellant Christopher B. Epps, appeals. We conclude that the
    district court did not clearly err in finding Wiley mentally retarded.             We
    therefore AFFIRM the district court’s judgment.
    No. 09-70037
    I. Factual and Procedural Background
    In 1981, Wiley shot and killed store owner J.B. Turner during the course
    of a robbery in DeSoto County, Mississippi. He also shot Turner’s daughter,
    leaving her seriously injured and blind. Wiley was charged with capital murder
    and was convicted in 1982. His conviction was affirmed on direct appeal, but his
    death sentence was vacated and the case was remanded for a new sentencing
    hearing because of improper comments that had been made by the prosecutor.
    See Wiley v. State, 
    449 So. 2d 756
    , 763 (Miss. 1984). Wiley was again sentenced
    to death in 1984, and the sentence was upheld on direct appeal. See Wiley v.
    State, 
    484 So. 2d 339
    , 355 (Miss. 1986). In a subsequent federal habeas petition,
    we vacated the death sentence on the ground that the state trial court had
    improperly instructed the second sentencing jury. See Wiley v. Puckett, 
    969 F.2d 86
    , 91 (5th Cir. 1992). In 1995, Wiley was sentenced to death for the third time.
    The sentence was again affirmed on direct appeal, see Wiley v. State, 
    691 So. 2d 959
    , 960 (Miss. 1997), and Wiley’s subsequent efforts for state post-conviction
    relief were unsuccessful.
    Wiley again sought federal habeas relief in a 
    28 U.S.C. § 2254
     petition. In
    2003, while his federal petition was pending, Wiley filed in state court a
    successive habeas application based on the United States Supreme Court’s
    decision in Atkins. Wiley claimed that he is mentally retarded and therefore
    ineligible for a death sentence.
    In support of his state habeas application, Wiley relied in part on an
    affidavit from Dr. David Grant, who administered to Wiley in 2003 the Wechsler
    Adult Intelligence Scale-Third Edition (WAIS-III). Dr. Grant reported from this
    test that Wiley’s Verbal IQ was 73, his Performance IQ was 68, and his full-scale
    IQ was 68, placing Wiley within the mentally retarded range for intellectual
    functioning. Dr. Grant also indicated that Wiley had adaptive behavior deficits
    in at least two defined areas and that Wiley’s mental retardation manifested by
    2
    No. 09-70037
    age eighteen. In addition to Dr. Grant’s testing, Wiley had also been tested in
    1987 and 1994 by Dr. Billy Fox, who administered the Wechsler Adult
    Intelligence Scale-Revised (WAIS-R), an earlier version of the Wechsler test. Dr.
    Fox’s testing had revealed full-scale IQ scores of 73 and 78, respectively. Dr. Fox
    indicated in a 1987 affidavit that Wiley was borderline mentally retarded. Dr.
    Grant opined that Wiley’s 1987 and 1994 scores were consistent with his 2003
    performance, and that Wiley was mildly mentally retarded. In a 2004 affidavit,
    Dr. Fox also agreed that Wiley’s 2003 score on the WAIS-III was consistent with
    his 1987 and 1994 WAIS-R scores. Dr. Fox explained that the consistency was
    due to the margin of error for the tests, the Flynn effect, and the practice effect.1
    Wiley also submitted with his state application his school records.
    The Mississippi Supreme Court declined to grant Wiley an evidentiary
    hearing on his Atkins claim because it determined that he failed to present a
    prima facie case. The court examined the record and held that the evidence did
    not support Wiley’s claim. See Wiley v. State, 
    890 So. 2d 892
    , 897–98 (Miss.
    2004). Instead, the court determined that, at best, Wiley’s experts had shown
    only borderline mental retardation. 
    Id. at 898
    . The court placed particular
    emphasis on several affidavits in the record that had been submitted by Wiley’s
    family and friends as mitigating evidence during the earlier state court
    proceedings. In the words of the state court, those affidavits indicated that
    Wiley “was a good husband, father, son and grandson, that he was a good,
    reliable worker with steady employment at various employers, that he
    1
    The so-called “Flynn effect” is a phenomenon positing that, over time, standardized
    IQ test scores tend to increase with the age of the test without a corresponding increase in
    actual intelligence in the general population. Those who follow the Flynn effect adjust for it
    by deducting from the IQ score a specified amount for each year since the test was normalized.
    See In re Salazar, 
    443 F.3d 430
    , 433 n.1 (5th Cir. 2006). Dr. Fox opined that Wiley’s score of
    78 on the 1994 WAIS-R reflected thirteen years of inflation since the test was originally
    standardized and was “unreliably high.” The “practice effect” holds that a subject who is tested
    more than once generally will do better on subsequent tests than on the first test.
    3
    No. 09-70037
    performed household maintenance, repaired automobiles, babysat children, ran
    errands, supported his family and did numerous other things.” Id. at 896. The
    court discounted Wiley’s school records as evidence of retardation because in
    addition to showing poor performance they also showed a poor attendance
    record, and there was no indication that Wiley had ever attended special
    education classes. Id. The court noted that Wiley had been in the Army until
    he injured his leg and was honorably discharged. Id. The court further noted
    that Wiley had not completed a test to rule out malingering. Id. at 898. It
    concluded that the “overwhelming weight of the evidence” showed Wiley was not
    mentally retarded. Id.
    Wiley filed a motion for rehearing, submitting a supplemental affidavit
    from Dr. Grant addressing the Mississippi Supreme Court’s opinion. Dr. Grant
    indicated that the court was incorrect to rely on the affidavits from Wiley’s
    friends and family as proof that Wiley was not mentally retarded. Contrary to
    the court’s holding, Dr. Grant stated that it is widely accepted in the medical
    community that mentally retarded persons are often able to perform basic life
    functions and tasks, such as holding jobs, driving cars, and supporting their
    families. Dr. Grant reiterated his opinion that, to a reasonable degree of
    psychological certainty, Wiley fell within the mentally retarded range, and the
    retardation manifested before age eighteen. The state court denied the motion.
    Wiley then raised his Atkins claim in federal court by amending his § 2254
    petition.   Wiley claimed that Dr. Grant’s affidavits had been sufficient to
    warrant an evidentiary hearing in state court, and that the Mississippi Supreme
    Court failed to follow its own precedent and procedures by denying him a
    hearing. Wiley maintained that the evidence showed he was mentally retarded.
    The federal district court initially denied Wiley’s Atkins claim but
    subsequently withdrew its decision after Wiley filed a motion to alter or amend
    the judgment under Federal Rule of Civil Procedure 59. The district court
    4
    No. 09-70037
    ordered additional briefing and conducted an evidentiary hearing. The court
    appointed Dr. C. Gerald O’Brien to examine Wiley. Wiley was also examined by
    his own expert, Dr. Victoria Swanson, and by an expert obtained by the State,
    Dr. Gilbert S. Macvaugh, III. At the evidentiary hearing, Drs. O’Brien and
    Swanson both testified that Wiley was mentally retarded, but Dr. Macvaugh
    reached a contrary conclusion. The district court issued a written opinion in
    which it first determined that the Mississippi Supreme Court had failed to follow
    its own precedent for determining whether a defendant should obtain a hearing
    on an Atkins claim, and that the failure to permit a hearing had denied Wiley
    due process. The district court determined that it was therefore not bound to
    afford deference to the state court’s resolution of Wiley’s claim. The district
    court determined from a preponderance of the evidence that Wiley was mentally
    retarded. The court held that Wiley was thus entitled to have his death sentence
    vacated pursuant to Atkins.
    The State now appeals.2           It contends that Wiley failed to meet the
    requirements for an evidentiary hearing in state court, and therefore the federal
    district court erroneously concluded that the state court denied Wiley due
    process. Under the State’s view, the district court should not have granted
    Wiley’s Rule 59 motion or conducted an evidentiary hearing and should have
    deferred to the Mississippi Supreme Court’s holding that Wiley is not mentally
    retarded. The State further argues that the district court’s conclusion that Wiley
    is mentally retarded is incorrect because Wiley failed to show in the federal
    hearing that he has subaverage intellectual ability and adaptive functioning
    deficits, both of which manifested before the age of eighteen. Before turning to
    2
    Although the district court’s judgment denied Wiley federal habeas relief on numerous
    additional claims challenging his conviction, Wiley did not file a notice of appeal or seek a
    Certificate of Appealability (COA) as to those additional claims. See 
    28 U.S.C. § 2253
    (c)(1);
    FED. R. APP. P. 22(b)(1). Thus, the only issue before us in the instant appeal is Wiley’s Atkins
    claim. Because the State is the appellant on this issue, no COA is required. See DiLosa v.
    Cain, 
    279 F.3d 259
    , 262 n.1 (5th Cir. 2002) (citing FED. R. APP. P. 22(b)(3)).
    5
    No. 09-70037
    the district court’s conclusion on metal retardation, we first set out the standard
    of review and the requirements under Atkins; we then consider the district
    court’s grant of an evidentiary hearing and its determination that no deference
    was due to the state court.
    II. Standard of review
    In an appeal from the district court’s grant of habeas relief, we review
    issues of law de novo and findings of fact for clear error. Fratta v. Quarterman,
    
    536 F.3d 485
    , 499 (5th Cir. 2008). Wiley’s habeas petition is governed by the
    standards of the Antiterrorism and Effective Death Penalty Act (AEDPA), 
    28 U.S.C. § 2254
    , because he filed his Atkins claim well after the effective date of
    the AEDPA. See Lindh v. Murphy, 
    521 U.S. 320
    , 324–26 (1997). Under those
    standards, a federal court may not grant a petitioner habeas relief on a claim
    that was adjudicated on the merits by the state court unless the state court
    decision was (1) “contrary to, or involved an unreasonable application of, clearly
    established Federal law, as determined by the Supreme Court,” or (2) “was based
    on an unreasonable determination of the facts in light of the evidence presented
    in the State court proceeding.” 
    28 U.S.C. § 2254
    (d); see Pierce v. Thaler, 
    604 F.3d 197
    , 200 (5th Cir. 2010).
    “A state court decision is ‘contrary to’ clearly established federal law if it
    applies a rule that contradicts the governing law set forth in Supreme Court
    cases . . . or if the state court decide[s] a case differently than the United States
    Supreme Court previously decided a case on a set of nearly identical facts.”
    Jones v. Cain, 
    600 F.3d 527
    , 535 (5th Cir. 2010) (internal quotation marks and
    citations omitted). A state court’s decision is an unreasonable application of
    clearly established federal law if it “correctly identifies the governing legal rule
    but applies it unreasonably to the facts of a particular prisoner’s case.” Gregory
    v. Thaler, 
    601 F.3d 347
    , 352 (5th Cir. 2010) (internal quotation marks and
    citations omitted). An unreasonable application of federal law is different from
    6
    No. 09-70037
    an incorrect or erroneous application of the law. Rogers v. Quarterman, 
    555 F.3d 483
    , 488–89 (5th Cir. 2009) (citing Williams v. Taylor, 
    529 U.S. 362
    , 409–10
    (2000)).
    III. Atkins and mental retardation
    The Supreme Court held in Atkins that the execution of mentally retarded
    persons constitutes cruel and unusual punishment in violation of the Eighth
    Amendment. See Atkins, 
    536 U.S. at 321
    . The Atkins Court did not define who
    is mentally retarded for purposes of eligibility for a death sentence but it
    referred generally to two definitions of mental retardation from the American
    Association on Mental Retardation (AAMR) and the American Psychiatric
    Association (APA).3 
    Id.
     at 309 n.3. Clinical definitions of mental retardation
    3
    The AAMR definition of mental retardation cited in the Atkins decision is as follows:
    Mental retardation refers to substantial limitations in present functioning. It
    is characterized by significantly subaverage intellectual functioning, existing
    concurrently with related limitations in two or more of the following applicable
    adaptive skill areas: communication, self-care, home living, social skills,
    community use, self-direction, health and safety, functional academics, leisure,
    and work. Mental retardation manifests before age 18.
    AAMR, MENTAL RETARDATION: DEFINITION, CLASSIFICATION, AND SYSTEMS OF SUPPORTS 5 (9th
    ed. 1992) (AAMR 9th ed.).
    The APA defines mental retardation similarly:
    The essential feature of Mental Retardation is significantly subaverage general
    intellectual functioning (Criterion A) that is accompanied by significant
    limitations in adaptive functioning in at least two of the following skill areas:
    communication, self-care, home living, social/interpersonal skills, use of
    community resources, self-direction, functional academic skills, work, leisure,
    health, and safety (Criterion B). The onset must occur before age 18 years
    (Criterion C).
    AMERICAN PSYCHIATRIC ASSOCIATION, DIAGNOSTIC AND STATISTICAL MANUAL OF MENTAL
    DISORDERS 41 (4th ed. 2000). This definition is often referred to as the DSM-IV-TR definition.
    In 2002, the AAMR modified its definition to read:
    Mental retardation is a disability characterized by significant limitations both
    7
    No. 09-70037
    typically require subaverage intellectual functioning, significant limitations in
    adaptive skills, and manifestation before the age of eighteen. 
    Id. at 318
    . Rather
    than adopt a definitive meaning of mental retardation, however, the Court left
    “‘to the State[s] the task of developing appropriate ways to enforce the
    constitutional restriction upon [their] execution of sentences.’”                  
    Id. at 317
    (quoting Ford v. Wainwright, 
    477 U.S. 399
    , 405, 416–17 (1986)).
    In accord with Atkins, the Mississippi Supreme Court set the standard for
    adjudging mental retardation in Mississippi in Chase v. State, 
    873 So. 2d 1013
    ,
    1028–29 (Miss. 2004), which it decided three months before it decided Wiley’s
    case.4       Under Chase, the trial court is to make the determination about
    retardation based on a preponderance of the evidence after an evidentiary
    hearing. Chase, 873 So. 2d at 1028–29. A defendant may not be adjudged
    retarded unless he presents, at a minimum, an expert opinion, to a reasonable
    degree of certainty, that (1) “[t]he defendant is mentally retarded, as that term
    is defined by the American Association on Mental Retardation and/or The
    American Psychiatric Association”; and (2) “[t]he defendant has completed the
    Minnesota Multiphasic Personality Inventory-II (MMPI-II) and/or other similar
    tests, and the defendant is not malingering.” Id. at 1029.
    The Mississippi Supreme Court also set out in Chase the standard for
    determining whether a defendant is entitled to an evidentiary hearing on his
    mental retardation claim. The court held that a hearing would not be granted
    unless a defendant files a motion to which he attaches an affidavit from at least
    in intellectual functioning and in adaptive behavior as expressed in conceptual,
    social, and practical adaptive skills. This disability originates before age 18.
    AAMR, MENTAL RETARDATION: DEFINITION, CLASSIFICATION, AND SYSTEMS OF SUPPORTS 1
    (10th ed. 2002) (AAMR 10 ed.).
    4
    Because the Mississippi Legislature has not addressed the issue of mental retardation
    in the context of death-penalty litigation, the Chase standard is controlling. See Doss v. State,
    
    19 So. 3d 690
    , 709–10 (Miss. 2009).
    8
    No. 09-70037
    one qualified expert “who opines, to a reasonable degree of certainty, that: (1) the
    defendant has a combined Intelligence Quotient (‘IQ’) of 75 or below, and; (2) in
    the opinion of the expert, there is a reasonable basis to believe that, upon further
    testing, the defendant will be found to be mentally retarded, as defined herein.”
    
    Id.
     The court explained that because the cutoff for the intellectual functioning
    prong of the test for mental retardation is 75, defendants with an IQ of 76 or
    above do not qualify for Atkins protection. 
    Id.
     at 1029 n.20. For defendants who
    were convicted before Atkins and Chase were decided, such as Wiley, the
    required expert affidavit may be submitted with the defendant’s application for
    post-conviction relief. 
    Id.
     at 1029–30.
    As noted above, Wiley’s position is that the affidavit he submitted from Dr.
    Grant with his state application for post-conviction relief satisfied the Chase
    standards to at least obtain an evidentiary hearing in state court. The district
    court agreed, and it held that the denial of a hearing in state court was a due
    process violation such that no deference was due to the state court decision. We
    agree with the district court, as we now explain.
    IV. Deference and a federal hearing
    When a petitioner has properly presented his Atkins claim in state court,
    and that court rejects it on the merits, we ordinarily apply AEDPA deference to
    the state court’s judgment on legal and factual grounds. Moore v. Quarterman,
    
    533 F.3d 338
    , 341 n.2 (5th Cir. 2008) (en banc); see also 
    28 U.S.C. § 2254
    (d).
    There is no dispute in this case that the Mississippi Supreme Court adjudicated
    Wiley’s Atkins claim on the merits. But the question of affording deference to
    the state court’s adjudication in this case is intertwined with the alleged due
    process violation by the state court’s failure to conduct a hearing.
    It is axiomatic that infirmities in state habeas proceedings under state law
    are not a basis for federal relief. See Moore v. Dretke, 
    369 F.3d 844
    , 846 (5th Cir.
    2004). Indeed, we have also held that a full and fair hearing in state court is not
    9
    No. 09-70037
    a prerequisite to applying the AEDPA’s deferential scheme. See Valdez v.
    Cockrell, 
    274 F.3d 941
    , 946 (5th Cir. 2001). The Supreme Court has recognized,
    however, that a state court’s unreasonable application of federal law, as a
    predicate for adjudicating a defendant’s claim, may undermine the AEDPA
    deference given to the state court adjudication. See Panetti v. Quarterman, 
    551 U.S. 930
    , 953 (2007) (“When a state court’s adjudication of a claim is dependent
    on an antecedent unreasonable application of federal law, the requirement set
    forth in § 2254(d)(1) is satisfied. A federal court must then resolve the claim
    without the deference AEDPA otherwise requires.”).
    Thus, when a petitioner makes a prima facie showing of mental
    retardation, a state court’s failure to provide him with an opportunity to develop
    his claim deprives the state court decision of the deference ordinarily due under
    the AEDPA. Rivera v. Quarterman, 
    505 F.3d 349
    , 358 (5th Cir. 2007). As we
    explained in Rivera, even though Atkins left to the states the job of
    implementing procedures for determining who is mentally retarded, “it was
    decided against the backdrop of the Supreme Court’s and lower court’s due
    process jurisprudence.” 
    Id.
     That jurisprudence included Ford v. Wainwright,
    
    477 U.S. 399
     (1986), which required a hearing in accord with fundamental
    fairness and procedural due process for defendants who make a showing of
    ineligibility for a death sentence due to insanity. 
    Id.
     (citing Ford, 
    477 U.S. at 424
     (Powell, J., concurring in part and concurring in the judgment)).
    We held in Rivera that the Texas Court of Criminal Appeals acted
    unreasonably by failing to conduct a full and fair evidentiary hearing in light of
    the petitioner’s prima facie case of mental retardation. 
    Id.
     at 357–58. We were
    guided by the Supreme Court’s decision in Panetti, where the Court held that
    after a petitioner made a substantial showing of incompetency the state court’s
    failure to provide the procedures elaborated on in Ford constituted an
    unreasonable application of clearly established federal law. Panetti, 
    551 U.S. at
    10
    No. 09-70037
    948. Moreover, the state court’s error deprived its decision of AEDPA deference.
    See 
    id.
     (“As a result of this error, our review of petitioner’s underlying
    incompetency claim is unencumbered by the deference AEDPA normally
    requires.”).
    The teachings of Panetti and Rivera inform our conclusion in Wiley’s case.
    We must decide whether Wiley presented a prima facie case of retardation, and
    was therefore entitled to a hearing. If he did, but the state court denied him the
    opportunity to develop his Atkins claim, the state court decision is not entitled
    to deference. In order to decide this question, we first closely examine the
    State’s argument that Wiley was not entitled to a hearing under state law, and
    we then consider the question of deference to the state court decision in light of
    the procedure the court applied in Wiley’s case.
    Although Wiley was convicted before Atkins was decided, and although he
    filed his state post-conviction application before the Mississippi Supreme Court
    established the state’s requirements for obtaining an Atkins hearing in Chase,5
    Wiley’s affidavit from Dr. Grant (as well as other evidence) on its face met the
    Chase requirements for an evidentiary hearing, and the State conceded as much
    at oral argument.6
    The State contends, however, that Wiley was not entitled to a hearing
    under Chase because Wiley’s pre-Atkins tests, which showed IQs of 73 and 78,
    included at least one score above the threshold for a mental retardation finding.
    5
    Wiley filed his Atkins claim in state court on June 19, 2003. The Mississippi Supreme
    Court decided Chase on May 20, 2004, and it adjudicated Wiley’s claim on August 26, 2004.
    6
    Dr. Grant stated that Wiley’s IQ was below the threshold of 75 and that Wiley was
    mentally retarded. See Chase, 873 So. 2d at 1028. Dr. Grant specifically found that Wiley’s
    IQ was 68. He also concluded that Wiley had adaptive behavior deficits in communication
    skills, functional academic skills, and health and safety skills based on numerous tests
    administered to Wiley. Dr. Grant further concluded that Wiley had the “ability to learn and
    perform simple tasks, but with significantly impaired reasoning and problem solving skills.”
    Dr. Grant concluded from the consistent poor performance reported in Wiley’s school records
    that Wiley’s mental retardation manifested prior to age eighteen.
    11
    No. 09-70037
    It argues that under state law, as interpreted by the Mississippi Supreme Court,
    no defendant may obtain an evidentiary hearing if there was any test score
    above 75. It asserts that Wiley was treated no differently from any other
    defendant making an Atkins claim, and therefore he suffered no deprivation of
    due process by being denied a hearing.
    In support of its argument that state law precludes an Atkins hearing
    when any single test score is above the threshold of 75, the State relies primarily
    on Branch v. State, 
    882 So. 2d 36
     (Miss. 2004). In that case, the defendant’s
    childhood IQ score at age five was 68, but post-arrest testing showed an IQ of 84.
    After noting the absence of evidence about adaptive skills deficits, the court held
    that Branch failed to make a prima facie showing of mental retardation. Id. at
    51. Wiley’s case is not substantially similar to Branch. Unlike Wiley, the
    defendant in Branch relied on tests done seventeen years earlier when he was
    a child, while a court-ordered psychologist who tested him after arrest said he
    had an IQ well above the threshold for mental retardation. See id. The court
    also found significant the absence of evidence concerning adaptive skills
    functioning. Id. In contrast, Wiley presented evidence of both recent and past
    IQ testing showing deficient intellectual functioning, as well as adaptive skills
    deficits. Branch does not present a situation like Wiley’s.7
    7
    In its brief, the State also relies on Scott v. State, 
    878 So. 2d 933
     (Miss. 2004) (Scott
    I), a direct appeal, where the defendant presented evidence that his IQ score from childhood
    was 48 and that his post-arrest IQ score was 60. His own expert questioned the validity of the
    childhood score, however, and testified that he believed Scott was actually functioning at a
    much higher level. Id. at 948. The state court held that the evidence was insufficient to
    require an evidentiary hearing, but it noted that if the defendant presented the required
    evidence and affidavits along with an application for post-conviction relief (PCR), a hearing
    could be warranted. Id. Scott, like Wiley, subsequently did provide additional affidavits and
    evidence in a “lengthy” PCR application, and he was granted a hearing. See Scott v. State, 
    938 So. 2d 1233
    , 1238 (Miss. 2006) (Scott II). In neither Scott I nor Branch did the defendant
    present an affidavit consistent with Chase that established that the defendant had subaverage
    intellectual functioning and adaptive skills deficits, as Wiley did in this case.
    12
    No. 09-70037
    Contrary to the State’s argument that a single IQ score may deny a
    defendant an Atkins hearing under state law, the Mississippi Supreme Court’s
    decision in Wiley’s case to deny a hearing and decide the mental retardation
    question appears to be an anomaly. In Chase itself, the Mississippi Supreme
    Court specifically recognized the due process underpinings at the core of an
    Atkins hearing, and the importance of a hearing even in the face of minimal or
    controverted evidence. See Chase, 873 So. 2d at 1020–21 (noting that although
    the State had raised “valid points” in contesting the defendant’s mental
    retardation claim, its task was “to determine whether Chase is entitled to a
    hearing, rather than weigh the credibility of evidence to be presented at that
    hearing” and that because both the Atkins decision and its guidance in Chase
    were unavailable to the defendant, due process required it “to allow the motion
    to be filed in the trial court, enabling Chase and the State to fully present to the
    trial judge evidence as required by Atkins”). Furthermore, decisions of the state
    court before and after Chase undermine the State’s position that a single IQ
    score will automatically disqualify a defendant from an Atkins hearing.
    For example, in Thorson v. State, 
    994 So. 2d 707
    , 715 (Miss. 2007), which
    was decided after Chase and is very similar to Wiley’s case, the record showed
    that the defendant’s IQ around the time of the murder offense was 77—above
    the Chase threshold. At Thorson’s trial, a doctor testified that a subsequent test
    showed the defendant’s IQ to be 74. The doctor also testified that Thorson was
    “borderline mentally retarded.” 
    Id.
     At sentencing, the same doctor testified that
    Thorson was “mentally handicapped” but not to the degree of the mentally
    retarded. 
    Id.
     Nevertheless, in connection with Thorson’s Atkins claim in his
    application for post-conviction relief, Thorson, like Wiley, submitted an affidavit
    from another doctor who opined that Thorson’s IQ was 70, that he had adaptive
    behavior deficits, and that the onset of the deficits occurred before age eighteen.
    
    Id.
     at 715–16. The Mississippi Supreme Court held that Thorson “met the
    13
    No. 09-70037
    requirements established . . . in Chase” and remanded the matter to the trial
    court for an evidentiary hearing. Id. at 716.
    The sequence of IQ test scores in Thorson mirrors the sequence in Wiley’s
    case. In both instances the defendant had two reported IQ scores before Atkins,
    one above Mississippi’s threshold of 75 and one below, and one post-Atkins IQ
    score that was below the threshold. In both cases, the defendant submitted an
    expert’s affidavit opining that he met the definition for a mentally retarded
    person. The Mississippi Supreme Court granted Thorson a hearing on facts
    nearly indistinguishable from Wiley’s case. The court also granted a hearing in
    another case involving multiple IQ scores decided before Chase in Russell v.
    State, 
    849 So. 2d 95
    , 148 (Miss. 2003). There the defendant received a hearing
    even though one of his two IQ scores, which were 68 and 76, was above the
    threshold for mental retardation. In light of these cases, the State’s argument
    that Wiley was treated no differently from any other defendant with several IQ
    test scores who makes an Atkins claim is seriously undermined.8
    The State also argues at some length that Wiley’s single IQ score of 78 in
    1994 automatically disqualified him from an evidentiary hearing unless that
    score is reduced by the Flynn effect. But it contends that neither the Mississippi
    8
    A survey of the Mississippi case law shows that the Mississippi Supreme Court has
    routinely granted evidentiary hearings as long as the Chase requirements are met even in the
    face of weak or controverted evidence. See, e.g., Doss v. State, 
    882 So. 2d 176
    , 193 & n.1 (Miss.
    2004) (granting the petitioner an evidentiary hearing despite “numerous legitimate questions
    concerning [the petitioner’s] claim” and noting in the face of inconsistencies in the evidence
    “that is precisely the procedure established by this Court in Chase, which allows the State, as
    well as Doss, to offer evidence in support of their respective arguments”); Smith v. State, 
    877 So. 2d 369
    , 398 (Miss. 2004) (where petitioner’s evidence showed an IQ of 75 at age 13, but a
    psychologist opined that the petitioner’s education records suggested only borderline mental
    retardation, the state supreme court held that “[n]otwithstanding the dearth of evidence,” it
    could not “constitutionally deny [the petitioner] the opportunity to present the issue of his
    possible mental retardation to the trial court” in an evidentiary hearing); Carr v. State, 
    873 So. 2d 991
    , 1007 (Miss. 2004) (granting a hearing “[n]otwithstanding the evidence,” which
    consisted of minimal testimony from a doctor at sentencing that the petitioner was mildly
    retarded and testimony from a school counselor that problems at school were likely from a lack
    of attendance, without any discussion of specific IQ test scores).
    14
    No. 09-70037
    Supreme Court nor this court has ever recognized the Flynn effect as
    scientifically valid. See In re Mathis, 
    483 F.3d 395
    , 398 n.1 (5th Cir. 2007);
    Salazar, 
    443 F.3d at
    433 n.1. The Mississippi Supreme Court made no mention
    of the Flynn effect, and we therefore need not address what, if any, impact it has
    in this case. Even without considering the Flynn effect, Wiley had two IQ scores
    that fell below the threshold established by the Mississippi Supreme Court to
    obtain an evidentiary hearing. We are not prepared to hold, as the State would
    have it, that one IQ score, by itself, conclusively precludes an evidentiary
    hearing when the Mississippi Supreme Court did not base its decision on that
    fact; there were other test scores below the mental retardation threshold; the
    state court has otherwise followed a fairly liberal policy in granting evidentiary
    hearings, even in the face of minimal evidence and multiple IQ scores; and at
    least one expert, Dr. Grant, provided a specific opinion in accord with Chase that
    Wiley is mentally retarded. The State’s contention that Wiley was not entitled
    to a hearing under Chase is therefore unavailing.
    This does not end the inquiry, however, as we must next consider whether
    the state court decision was nevertheless entitled to AEDPA deference despite
    Wiley’s satisfaction of the requirements for an evidentiary hearing. The state
    court in this case apparently decided that it should adjust the standards that it
    had established in Chase.      The court stated that “evolving standards” for
    determining who is mentally retarded required it “to expand on the procedure
    to be used in reaching a determination of mental retardation.” Wiley, 890 So. 2d
    at 897. The court held that it would therefore “consider the entire record before
    it in deciding whether to grant an Atkins hearing.” Id.
    We will ordinarily defer to a state court’s interpretation of its own law, see
    Woodfox v. Cain, 
    609 F.3d 774
    , 816 (5th Cir. 2010), and we find no fault in the
    state court’s use of evolving standards to make the determination whether to
    grant a hearing, or its consideration of the entire record. A state court’s
    15
    No. 09-70037
    precedent certainly is not set in stone, and the court must be able to change its
    rules if, in its judgment, it is advisable to do so. Indeed, state courts are granted
    much leeway in determining when a hearing is required, but in determining
    whether to give deference to the state court’s decision here, we must consider
    whether that court’s application of its own standards and precedent resulted in
    a denial of due process under the federal Constitution. See Panetti, 
    551 U.S. at
    950–51 (“If [the failure to provide a competency hearing] did, in fact, constitute
    a violation of the procedural framework Texas has mandated for the adjudication
    of incompetency claims, the violation undermines any reliance the State might
    now place on Justice Powell’s assertion that ‘the States should have substantial
    leeway to determine what process best balances the various interests at stake.’”)
    (quoting Ford, 
    477 U.S. at 427
    ). We conclude from our review of the relevant
    case law and the record before the state court that the state court’s departure
    from its own Chase standards in the face of Wiley’s evidence of retardation failed
    to provide Wiley with the minimum constitutional protections.
    It is evident from the Mississippi case law that up until the Mississippi
    Supreme Court decided Wiley’s case, the court remanded Atkins claims to the
    trial court for an evidentiary hearing on the retardation question when the
    Chase requirements (or what became the Chase requirements) were met. The
    court has continued to follow this procedure even after deciding Wiley’s case.
    But in the instant case, the court unexpectedly proceeded to a merits-based
    determination of factual questions and essentially required Wiley to prove his
    claim at the prima facie stage, pretermitting the opportunity for the hearing and
    the fuller development of the evidence that Chase contemplated.
    By adjudicating Wiley’s mental retardation claim without telling him that
    it would do so, the state court implicated the “core due process concepts” of notice
    and foreseeability. See Rogers v. Tennessee, 
    532 U.S. 451
    , 459 (2001). The state
    court applied an unexpectedly more stringent process to Wiley without notice,
    16
    No. 09-70037
    contrary to its announced procedure in numerous cases. Cf. Bouie v. City of
    Columbia, 
    378 U.S. 347
    , 354 (1964) (“When a state court overrules a consistent
    line of procedural decisions with the retroactive effect of denying a litigant a
    hearing in a pending case, it thereby deprives him of due process of law . . . .”);
    see also Janecka v. Cockrell, 
    301 F.3d 316
    , 324 n.11 (5th Cir. 2002) (noting that
    due process is implicated where retroactive judicial alterations of common law
    doctrines are “‘unexpected and indefensible by reference to the law which had
    been expressed prior to the conduct at issue’” (quoting Rogers, 
    532 U.S. at 462
    ));
    Talavera v. Wainwright, 
    468 F.2d 1013
    , 1015–16 (5th Cir. 1972) (holding that
    state supreme court’s retrospective application of a state severance statute
    rather than its less stringent interpretation of the prior rule in effect at time of
    trial was a violation of due process). Had the state court followed its established
    procedures and remanded Wiley’s case to the trial court for a hearing, or had it
    given notice to Wiley that his pleading was deficient and that it intended to
    adjudicate fully the Atkins claim, Wiley could have amended his state habeas
    application or supplemented his claim with additional evidence. See, e.g., Bishop
    v. State, 
    882 So. 2d 135
    , 151 (Miss. 2004) (holding on direct appeal that
    defendant who supported his Atkins claim only with school records and family
    members’ affidavits was not entitled to a hearing but that if he filed an affidavit
    that complied with Chase he could be entitled to a hearing). As it was, Wiley
    was left to believe that the state habeas application he filed before the Chase
    decision was sufficient because he had already filed an expert’s affidavit in
    accord with Chase only to find later that the state court reached a contrary
    conclusion by departing from its previously announced standards for
    determining who gets an Atkins hearing.9
    9
    Relying on its decision in Wiley’s case, the Mississippi Supreme Court said in a
    subsequent opinion that technical compliance with the Chase requirements is insufficient to
    warrant a hearing if the record evidence “overwhelmingly belies” the mental retardation claim.
    17
    No. 09-70037
    Moreover, a review of the state court’s reasons for rejecting Wiley’s claim
    of retardation and the specific evidence presented demonstrates the disputed
    nature of the facts and bears out the need for a hearing to test the arguments of
    both sides. Instead of granting a hearing, the state court decided the retardation
    question itself and held that Wiley was not retarded because, in its view, Wiley’s
    family affidavits “did not allege or establish that Wiley is mentally retarded.”
    Wiley, 890 So. 2d at 896–97. It found compelling the State’s argument based on
    the family affidavits that retarded people do not perform such functions as
    driving tractors, joining the Army, obtaining a driver’s license, and supporting
    their families.10 Id.
    Wiley’s motion for rehearing cast material doubt on such an argument,
    however.      In the supplemental affidavit in support of Wiley’s motion for
    rehearing, Dr. Grant opined that “mentally retarded persons do indeed ‘hold
    jobs,’ ‘drive cars,’ and ‘support families.’” According to Dr. Grant, there is a
    “widely-recognized view within the medical community that mentally retarded
    persons are often able to perform such tasks.”                   Dr. Grant supported his
    assertions with attached excerpts from psychiatric literature. See Bryan H.
    King, M.D., et al., Mental Retardation, in COMPREHENSIVE TEXTBOOK                             OF
    Hughes v. State, 
    892 So. 2d 203
    , 216 (Miss. 2004). In a subsequent federal habeas petition,
    the federal district court held that the state court’s failure to conduct a hearing in the face of
    a prima facie case of mental retardation denied Hughes due process. See Hughes v. Epps, 
    694 F. Supp. 2d 533
    , 543 (N.D. Miss. 2010). We note that the State did not appeal that holding.
    We also believe that the evidence in Wiley’s case did not “overwhelming belie” his claim.
    10
    In Chase, the State made a similar argument and offered evidence that the petitioner
    was never in special education classes, never failed a grade in school, played quarterback on
    the football team, completed a welding course and became a certified welder, performed yard
    work and washed cars, cooked for his mother, had a girlfriend, and had no deficits in social
    skills. Chase, 873 So. 2d at 1022. Despite the fact that this evidence “would certainly be
    persuasive and interesting to the trial judge at the hearing,” the Mississippi Supreme Court
    permitted a hearing because the petitioner had “arguably demonstrated that his IQ falls
    within the range of possible mental retardation, and because he has presented an affidavit
    which asserts that he suffers from ‘mild mental retardation.’” Id. at 1022, 1023.
    18
    No. 09-70037
    PSYCHIATRY VOL. II 2598 (Benjamin Sadock, M.D. & Virginia Sadock, M.D. eds.,
    7th ed. 2000) (“As adults, many [individuals with mild mental retardation] hold
    jobs, marry, and raise families . . . .”); AMERICAN PSYCHIATRIC ASSOCIATION,
    DIAGNOSTIC AND STATISTICAL MANUAL OF MENTAL DISORDERS 43 (4th ed. 2000)
    (DSM-IV-TR) (“By their late teens, [persons with Mild Mental Retardation] can
    acquire academic skills up to approximately the sixth-grade level. During their
    adult years, they usually achieve social and vocational skills adequate for
    minimum self-support . . . . With appropriate supports, individuals with Mild
    Mental Retardation can usually live successfully in the community, either
    independently or in supervised settings.”). In light of this evidence, Wiley’s
    ability to function vel non was the type of clearly disputed fact that could benefit
    from a hearing before the state court. See Thompson v. Bell, 
    580 F.3d 423
    , 436
    (6th Cir. 2009) (“Regardless of whether Thompson’s incompetency petition
    should be granted, his evidence has at least created a genuine issue about his
    competency, and therefore warrants an evidentiary hearing. . . . Because the
    Tennessee courts unreasonably applied federal law clearly established by Ford,
    this Court does not afford AEDPA deference to their dismissal of Thompson’s
    petition.”).
    This conclusion is also supported by Wiley’s school records, which show
    that Wiley attended school only from first to eighth grade, that his grades
    consisted of Ds and Fs in all subjects, with the exception of a few Cs and C
    minuses, and that he was twice socially promoted despite failing marks. Dr.
    Grant’s testing revealed that Wiley’s reading and writing ability are, at best, on
    a fourth grade level. This evidence created at least disputed questions of fact
    about Wiley’s abilities noted elsewhere in the record. See Wiley, 
    890 So. 2d 896
    –97 (noting that Wiley’s family affidavits suggested Wiley “did ‘pretty well
    in school’” and spent his prison time studying the Bible, reading, and writing to
    pen pals).
    19
    No. 09-70037
    Wiley presented a prima facie case of mental retardation in his state court
    habeas application under the Mississippi standards for an Atkins claim, see
    Chase, 873 So. 2d at 1029, and his evidence and affidavits raised “serious
    questions about [Wiley’s] possible retardation,” Rivera, 
    505 F.3d at 357
    ; cf. In
    re Henderson, 
    462 F.3d 413
    , 415 (5th Cir. 2006) (holding, albeit in another
    context, that a prima facie case of mental retardation “‘is simply a sufficient
    showing of possible merit to warrant a fuller [exploration] by the district court’”
    (citation omitted)). Therefore, faced with the threshold question of whether to
    allow Wiley’s claim to proceed to a hearing, it was an unreasonable application
    of clearly established federal law for the Mississippi Supreme Court to deny
    Wiley’s Atkins claim without a hearing, and the district court correctly concluded
    that it was not bound to afford the state court’s decision deference. See Rivera,
    
    505 F.3d at 357
    ; see also Panetti, 
    551 U.S. at 948
    .
    V. The merits of Wiley’s Atkins claim
    We must next consider whether the district court’s determination that
    Wiley is mentally retarded was erroneous. As noted above, a claim of mental
    retardation in Mississippi requires proof that the defendant has subaverage
    intellectual functioning, significant deficits in at least two areas of adaptive
    functioning, and manifestation prior to the age of eighteen. See Chase, 873 So.
    2d at 1027–29. A defendant must also prove through appropriate testing that
    he is not malingering. Id. at 1028–29.
    20
    No. 09-70037
    1. Subaverage intellectual functioning
    Whether a petitioner suffers from significantly subaverage intellectual
    functioning is a question of fact. Clark v. Quarterman, 
    457 F.3d 441
    , 444 (5th
    Cir. 2006). We will not disturb a district court’s factual findings unless they are
    implausible in light of the record considered as a whole. Rivera, 
    505 F.3d at 361
    ;
    see Anderson v. City of Bessemer City, N.C., 
    470 U.S. 564
    , 573–74 (1985) (“If the
    district court’s account of the evidence is plausible in light of the record viewed
    in its entirety, the court of appeals may not reverse it even though convinced
    that had it been sitting as the trier of fact, it would have weighed the evidence
    differently.”). “Where there are two permissible views of the evidence, the
    factfinder’s choice between them cannot be clearly erroneous.” Anderson, 
    470 U.S. at 574
     (citation omitted).
    The Atkins Court recognized that IQ scores ranging from 70 to 75 are
    generally considered to be the cutoff for the intellectual functioning prong of the
    test for mental retardation. Atkins, 
    536 U.S. at
    309 n.5. The Mississippi
    Supreme Court has adopted as its cutoff for Atkins protection an IQ score of 75.
    Chase, 873 So. 2d at 1029 n.20.
    Wiley was administered an IQ test five times between 1987 and 2009. The
    testing was done on two versions of the Wechsler test—the WAIS-R and the
    WAIS-III—and on the Stanford-Binet Intelligence Scales, Fifth Edition (the
    SB5). In addition to the testing by Dr. Fox and Dr. Grant discussed above, Wiley
    was tested by the court-appointed expert, Dr. O’Brien, and by the state’s expert,
    Dr. Macvaugh.11
    When the district court considered Wiley’s scores, it noted that the experts’
    testimony and reports indicated that they were subject to a confidence interval
    11
    Wiley’s own expert, Dr. Swanson, testified that she did not administer a standardized
    IQ test because Wiley had already been tested several times, and she believed the results of
    another test could be inflated by the so-called practice effect.
    21
    No. 09-70037
    (CI) of 95%, meaning that due to standard errors of measurement the experts
    would expect with 95% confidence that Wiley’s true IQ would fall within a
    certain range around the reported score. The district court also noted that the
    experts debated the application of the Flynn effect. As noted above, the Flynn
    effect provides a reduction in IQ scores to account for inflation in the score based
    on the number of years since the test was normalized. All three experts who
    testified at the evidentiary hearing stated that the Flynn effect is generally
    accepted in the scientific community, but they did not agree as to whether an
    individual IQ score must be adjusted to reflect the phenomenon. Drs. O’Brien
    and Swanson testified that an adjustment should be considered, but Dr.
    Macvaugh disagreed. The district court noted that Wiley’s full-scale IQ scores
    (FSIQ), the CI interval ranges, and the Flynn adjusted IQ scores were as follows:
    Date Examiner            Test         FSIQ         95% CI range        Flynn effect
    1987 Dr. Fox             WAIS-R         73           68–78                   70
    1994 Dr. Fox             WAIS-R         78           73–83                   73
    2003 Dr. Grant           WAIS-III       68           65–73                   65
    2007 Dr. O’Brien         WAIS-III       70           67–75                   66
    2009 Dr. Macvaugh        SB5            80           76–84                   77
    The State argues that the district court found Wiley mentally retarded
    because it erroneously applied the Flynn effect to Wiley’s scores. It contends
    that without such an adjustment only Dr. Grant’s score of 68 clearly falls within
    the range for mental retardation. The State urges that the Flynn effect should
    not be employed and that even if it is considered, Wiley’s adjusted score on the
    SB5 was 77.
    The State is incorrect that the district court found Wiley mentally retarded
    only because of the Flynn adjusted scores. The court explicitly stated that it was
    22
    No. 09-70037
    “not holding that the Flynn effect must be applied to properly assess an
    individual’s IQ, and it is not holding that failing to apply it is unreasonable.”
    Instead, the court indicated only that it should be considered as one factor when
    interpreting Wiley’s IQ scores in light of the unanimous opinion from the
    experts.12 We need not resolve the weight, if any, to be given to the Flynn effect,
    however, because the district court also found that even without it the evidence
    supported a finding that Wiley had significant subaverage intellectual
    functioning. On the record before us, that finding is not clearly erroneous.
    Dr. O’Brien’s report opined that Wiley’s full scale IQ without any
    adjustments for the Flynn effect was likely to be between 67 and 75. Dr. O’Brien
    testified that the score of 80 obtained by Dr. Macvaugh, as well as the score of
    78 obtained by Dr. Fox in 1994, were likely “outliers” insofar as they did not fit
    within the overall pattern of scores obtained across the range of testing. Dr.
    Swanson testified that Wiley’s scores from 1987 to 2007 were “fairly tight.”
    Although her report made adjustments for the Flynn effect, it also reported that
    the four Wechsler tests had overlapping ranges between 68 and 70, which in her
    opinion was Wiley’s true IQ score.
    The State argues that Dr. Macvaugh’s score of 80 precludes a finding that
    Wiley is mentally retarded. It contends that the fact that a score may be an
    outlier does not render it invalid. We reject the State’s position that an IQ score
    above the cutoff for mental retardation automatically resolves a defendant’s
    Atkins claim when the defendant has been tested as many times as Wiley has
    been tested and a majority of the scores fall within the mental retardation range.
    As discussed above, the State’s contention is not found in the Mississippi
    Supreme Court’s case law. Cf. Thomas v. Allen, 
    607 F.3d 749
    , 757 (11th Cir.
    2010) (rejecting argument that district court clearly erred in finding defendant
    12
    In its written decision the court referred to “test obsolescence,” which we interpret to
    be the same as the Flynn effect based on the experts’ testimony at the evidentiary hearing.
    23
    No. 09-70037
    mentally retarded where one of several IQ test scores was above the state’s
    threshold: “There is no Alabama case law stating that a single IQ raw score, or
    even multiple IQ raw scores, above 70 automatically defeats an Atkins claim
    when the totality of the evidence (scores) indicates that a capital offender suffers
    subaverage intellectual functioning.”).
    To be sure, the Mississippi Supreme Court has held that a person with an
    IQ above 76 does not have a valid Atkins claim. Chase, 
    873 So. 2d 1029
     n.20
    (“[D]efendants with an IQ of 76 or above do not qualify for Eighth Amendment
    Atkins protection.”). But we have found no state court authority indicating how
    to assess the defendant’s true IQ score in the face of multiple IQ examinations.
    The court has said simply that a defendant must present expert evidence that
    he is mentally retarded and that he is not malingering. Id. at 1029. After
    hearing evidence from both the State and the defendant, the trial court is then
    to determine whether the defendant is mentally retarded from a preponderance
    of the evidence. Id. The state court treats Atkins hearings the same as any other
    evidentiary consideration. See id. (stating that after the defendant and the State
    present evidence as allowed by the Mississippi Rules of Evidence “the matter
    should proceed as other evidentiary hearings on motions”). Therefore, the
    district court here was not bound by a single reported IQ score, but rather was
    free to consider all the reported scores and testimony as part of its analysis of
    the evidence.
    The hearing in this case was essentially a battle of the experts, who gave
    competing opinions as to Wiley’s IQ and intellectual functioning. The calculation
    of a person’s IQ score is imprecise at best and may come down to a matter of the
    examiner’s judgment. Cf. Clark, 457 F.3d at 444 (noting that the “confidence
    band is designed to account for the measurement error inherent in intelligence
    testing”). The State’s expert even testified that no test or examiner is perfect.
    Although Dr. Macvaugh disagreed with the opinions of Dr. Grant and Dr.
    24
    No. 09-70037
    O’Brien, he testified that his disagreement was based on “examiner judgment”
    in the scoring of the IQ tests and conceded that “these things could be argued
    either way.”
    As noted by the district court, the record contains three expert
    assessments that explicitly found Wiley’s IQ to be below 75, without any
    adjustments for the Flynn effect or practice effect. (Dr. Fox’s score of 73 in 1987;
    Dr. Grant’s score of 68 in 2003; and Dr. O’Brien’s score of 70 in 2007.) The
    record also contains opinions from three experts (Drs. Grant, O’Brien, and
    Swanson) that Wiley has subaverage general intellectual functioning, as
    required by Atkins. Given the nature of IQ scoring and the presence of several
    IQ tests in the record, we do not believe it was clearly erroneous for the district
    court to place weight on these experts’ opinions when determining Wiley’s
    intellectual functioning.
    The State’s argument would have us simply accept the opinion of Dr.
    Macvaugh over the opinions of Dr. O’Brien, Dr. Swanson, and Dr. Grant. We
    will not re-weigh the facts and evidence in order to reach a decision contrary to
    the district court’s conclusion. See Anderson, 
    470 U.S. at 574
    ; see also Rivera,
    
    505 F.3d at 363
     (the district court is in the best position to weigh the evidence).
    The record supports the district court’s assessment of Wiley’s intellectual
    functioning, and we conclude that the district court did not clearly err in its
    finding from a preponderance of the evidence that Wiley satisfies this prong of
    the test for mental retardation.
    2. Adaptive functioning deficits
    A diagnosis of mental retardation requires not only subaverage intellectual
    ability but also significant deficits in adaptive functioning. See Chase, 873 So. 2d
    at 1028 & n.18. “Adaptive functioning refers to how effectively individuals cope
    with common life demands and how well they meet the standards of personal
    independence expected of someone in their particular age group, sociocultural
    25
    No. 09-70037
    background, and community setting.” DSM-IV-TR at 42. To meet this prong of
    the test, clinical definitions of mental retardation found in both the DSM-IV-TR
    and the AAMR require proof of limitations in two or more adaptive skill areas,
    which include communication, self-care, home living, social skills, community
    use, self-direction, health, safety, functional academics, leisure, and work.13 See
    Atkins, 
    536 U.S. at
    309 n.3 (quoting AAMR 9th ed. at 5, and DSM-IV-TR at 41).
    Wiley’s adaptive functioning skills have been assessed four times: by Dr.
    Grant in 2003, by Dr. O’Brien in 2008, by Dr. Macvaugh in 2008–09, and by Dr.
    Swanson in 2009. Dr. Grant and Dr. Swanson used standardized measures of
    adaptive functioning to assist in their assessments of Wiley.                       Dr. Grant
    administered to Wiley the Independent Living Scale. Dr. Swanson used the
    Vineland-II Adaptive Behavior Scales (Vineland), as well as the Adaptive
    Behavior Assessment Scale (ABAS-II). Swanson used the standardized tests to
    gather information retrospectively by asking Wiley’s grandmother and his
    former wife to recall Wiley’s behavior at age fifteen and eighteen, respectively.
    Drs. Grant, O’Brien, and Swanson concluded that Wiley had sufficient adaptive
    functioning deficits to be considered mildly mentally retarded, while Dr.
    Macvaugh disagreed.
    After reviewing the experts’ reports and considering the testimony at the
    hearing, the district court held that Wiley met his burden of showing by a
    preponderance of the evidence that he suffers from significant deficits in the
    areas of functional academics, communication, and self-direction. Rather than
    13
    As noted above, the tenth edition of the AAMR revised the definition to require proof
    of limitations in adaptive behavior as expressed in “conceptual, social, and practical adaptive
    skills.” The AAMR indicates that its Terminology and Classification Committee made this
    change because of a lack of a single standardized measure of adaptive behavior that measures
    all of the original skills. AAMR 10th ed. at 81. Dr. O’Brien testified that the ninth and tenth
    editions of the AAMR look at the same types of adaptive behavior, but the tenth edition
    essentially groups into three categories the individual skill areas of the ninth edition. Both Dr.
    O’Brien and Dr. Swanson indicated that their diagnoses of Wiley were the same under both
    editions.
    26
    No. 09-70037
    challenge these findings, the State presents two arguments that concern the
    process by which the court and the experts reached their conclusions about
    Wiley’s adaptive behavior.
    The State first asserts that the Mississippi Supreme Court found from the
    affidavits of Wiley’s family and friends that Wiley did not have deficits in
    adaptive behavior, and that the state court’s decision was not unreasonable. The
    affidavits at issue showed that Wiley often provided money to help pay
    household bills, possessed skill repairing vehicles and frequently helped friends
    and neighbors with auto repairs, provided transportation for others, volunteered
    for military service, and was a reliable worker who quit school to go to work to
    provide for his family.
    Because we have determined that the district court did not err by declining
    to afford deference to the Mississippi Supreme Court’s decision, the district court
    was not limited to consideration of this evidence at the hearing. Moreover, Drs.
    Grant, O’Brien, and Swanson all opined that mentally retarded persons could
    perform the types of activities noted in the affidavits. See Thomas, 
    607 F.3d at 759
     (rejecting State’s argument that defendant was not retarded because he
    worked on a farm performing manual labor and driving a tractor and also held
    several other menial labor jobs where experts agreed these skills are consistent
    with mild mental retardation and State’s own expert testified that mentally
    retarded persons can drive cars and hold menial jobs).
    The State also contests the methodology used by Wiley’s examiners,
    primarily Dr. Swanson. It argues that Swanson’s retrospective use of the
    Vineland and the ABAS-II to ask about Wiley’s past behavior was erroneous and
    that Dr. Swanson also incorrectly scored individual questions on the tests. We
    are unpersuaded by the State’s rather cursory briefing of this issue.
    The assessment of adaptive functioning deficits is no easy task. Because
    its conceptualization “has proven elusive,” adaptive functioning “historically has
    27
    No. 09-70037
    been assessed on the inherently subjective bases of interviews, observations, and
    professional judgment.” Doss v. State, 
    19 So. 3d 690
    , 713 (Miss. 2009) (internal
    quotation marks and citation omitted). The Mississippi Supreme Court has
    recognized that “there is not one test to determine mental retardation, including
    the adaptive functioning component” and that there has been no agreement
    among professionals as to the proper test for assessing adaptive behavior. Id.
    at 712. The district court here also recognized that there is debate among
    clinicians as to whether retrospective assessments are valid for determining
    adaptive functioning in an Atkins-related context. Nevertheless, the district
    court found the testing by Dr. Swanson, which she corroborated with interviews
    of others and with direct probes of Wiley, to be sufficiently reliable for
    consideration. We see no clear error in the district court’s findings. See, e.g., id.
    at 714 (holding in the face of similar expert disagreement about standardized
    adaptive testing and the adaptive functioning of the defendant that neither
    side’s methodology was infallible and that the ultimate issue of whether the
    defendant is mentally retarded is up to the trial court after assessing the totality
    of the evidence and the credibility of the witnesses). The record and evidence
    before the district court in this case supported the court’s consideration of the
    information obtained by Dr. Swanson.
    Although Dr. Macvaugh disagreed with Dr. Swanson’s use of the ABAS-II
    and Vineland tests, even he agreed that some experts believe standardized
    instruments are necessary to assist in the assessment of adaptive behavior. The
    tenth edition of the AAMR specifically recommends the use of standardized
    measures and instruments, and it notes that the ABAS-II test “can be used to
    identify significant limitations in adaptive behavior.” See AAMR 10th ed. at 76,
    81, 83. Furthermore, the authors of the Vineland test expressly state that
    retrospective interviews to obtain information about a subject’s behavior at an
    earlier age is permissible in certain circumstances, including when the subject
    28
    No. 09-70037
    is in a restricted environment, such as prison, and there is a question about the
    subject’s adaptive functioning before coming to that environment. See SARA S.
    SPENCER, ET AL., VINELAND ADAPTIVE BEHAVIOR SCALES, SECOND ED., Expanded
    Interview Form Manual, 28 (emphasis added).
    The AAMR 10th edition recommends that because the adaptive
    functioning assessment typically takes the form of interviewing third-parties,
    the respondent should be someone who is well acquainted with the subject’s
    behavior over an extended period, such as a parent, teacher, or direct-service
    provider.   AAMR 10th ed. at 85. Here, Dr. Swanson spoke with Wiley’s
    grandmother and with his former wife. She also spoke with other persons
    familiar with Wiley, such as his former supervisor, to probe the information
    about him. The State offers no evidence or even a cogent argument that the
    answers given by Wiley’s grandmother and wife were incorrect or faulty. Dr.
    Macvaugh also admitted that speaking with Wiley’s family members, as Dr.
    Swanson did, was something he also should have pursued. See Doss, 19 So. 3d
    at 714 (“Interviews with family members, and others familiar with an
    individual’s typical behavior over an extended period of time in various settings,
    can supplement or aid in the interpretation of test results.”).
    At bottom, the State would have us accept the opinion of its own expert as
    a substitute for the opinions of Dr. Grant, Dr. O’Brien, and Dr. Swanson. But
    the district court, having presided over the evidentiary hearing, “is in a better
    position than this court to judge and weigh the credibility of the witnesses who
    testified on the extent, duration, and causes of [Wiley’s] adaptive functioning
    limitations.” Rivera, 
    505 F.3d at 363
    . On the record before us, we cannot say
    that the district court erred by considering the opinions of the experts who
    testified that Wiley has adaptive functioning deficits as part of the totality of the
    evidence. See Doss, 19 So. 3d at 712.
    29
    No. 09-70037
    As noted above, the State has failed to brief the district court’s factual
    findings on the specific areas of functional skills deficits or explain how those
    findings are clearly erroneous, and we may consider that issue waived. See, e.g.,
    Procter & Gamble Co. v. Amway Corp., 
    376 F.3d 496
    , 499 n.1 (5th Cir. 2004)
    (“Failure adequately to brief an issue on appeal constitutes waiver of that
    argument.”). For the sake of completeness, and to give the district court’s
    decision context, however, we briefly mention some of the deficits found by the
    district court.
    First, all of the experts agreed that Wiley possesses significant deficits in
    the area of functional academics and that his functional academic ability is
    between the third and sixth grade levels. Dr. Grant administered to Wiley the
    Wide Range Achievement Test-Revision III (WRAT-III) and the Nelson-Denny
    Reading Comprehension Test. He concluded that Wiley was functioning on a
    fourth grade level.14 Dr. O’Brien tested Wiley with the fourth edition of the
    WRAT (WRAT-4) and found results consistent with Dr. Grant’s earlier report.15
    Dr. Macvaugh also administered the WRAT-4 and reported similar results and
    conclusions.16 Dr. Swanson concluded from her own administration of the
    14
    Dr. Grant reported that Wiley scored a 68 (1st percentile) on the WRAT-III, which
    is a grade equivalent of 4.2. Wiley scored a 64 on the reading subtest for word recognition,
    which is a grade equivalent of 4.3, and a 70 on spelling, which is equivalent to grade 5.1. The
    Nelson-Denny Reading Comprehension Test yielded a grade equivalent of 4.1.
    15
    On the WRAT-4, as reported by Dr. Grant, Wiley achieved the following scores: Word
    Reading standard score of 77, fifth grade level; Sentence Comprehension standard score of 74,
    sixth grade level; Spelling standard score 74, fourth grade level; Arithmetic standard score 76,
    fourth grade level.
    16
    The scores obtained by Dr. Macvaugh for the WRAT-4 were as follows: Word Reading
    standard score of 77 (6th percentile; grade equivalent of 5.7); Sentence Comprehension
    standard score of 74 (4th percentile; grade equivalent of 6.5); Spelling standard score of 72 (3rd
    percentile; grade equivalent of 4.3); Math Computation standard score of 81 (10th percentile;
    grade equivalent of 5.4); and Reading Composite standard score of 73 (4th percentile).
    30
    No. 09-70037
    WRAT-4, as well as the Woodcock Johnson and Kaufman Tests of Educational
    Achievement, that Wiley was functioning on a third to fourth grade level.17
    Wiley’s military records also support a finding that Wiley possesses limited
    academic skills. Wiley’s Army record indicates that he was forced to abandon his
    training in radio operator school because of failing tests and “difficulty relating
    the information contained in technical manuals to the appropriate equipment.”
    The military instructors concluded that “this course of training is too difficult for
    him to complete in a reasonable length of time.”                Wiley’s “poor academic
    progress” resulted in a “resentful attitude.” Wiley was discharged from the
    Army when his commander determined that “[r]eassignment of this individual
    would not be in the best interest of the Army because of his extremely negative
    attitude towards the military and his physical and mental limitations”
    (emphasis added).
    The district court also concluded that Wiley had deficits in the adaptive
    functioning area of communication, as evidenced by Wiley’s oral comprehension
    scores on academic tests and language battery, Wiley’s school records, the
    experts’ interviews of Wiley, and reports of interviews with Wiley’s family and
    friends. The record and opinions of the experts supports the district court’s
    conclusion.
    Dr. Swanson testified that her testing showed that at the age of eighteen
    Wiley had the communication skills of someone six to nine years old. She
    concluded that Wiley could not be given verbal directions, but that he could learn
    17
    Dr. Swanson indicated in her report that Wiley’s various test results were
    corroborated by his school records, which showed that he passed the fourth grade with minimal
    grades but had been socially promoted or retained in subsequent years. She opined that such
    an “academic plateau” was common in persons with mild mental retardation, who often make
    slow progress early but plateau between fourth and sixth grade. Wiley’s school records show
    that he repeated both the fifth and sixth grades. Following his grandfather’s death, Wiley
    dropped out of school in the eighth grade to work on his grandparents’ farm. Some of the
    problems noted by Dr. Swanson involved Wiley’s memory, abstract reasoning, and reading and
    writing skills.
    31
    No. 09-70037
    tasks visually upon demonstration. Interviews with Wiley’s grandmother and
    former wife revealed that Wiley had been a shy child, was “late to talk,” could
    not remember oral instructions or give complex directions, and did not express
    his feelings well. Dr. Swanson concluded that Wiley had communication deficits
    in areas of receptive vocabulary, oral expression, listening comprehension or
    following directions, and written language. Dr. Grant also gave Wiley a series
    of tests to gauge his communication skills, including the Oral and Written
    Language Scale (OWLS) and the Expressive Vocabulary Test (EVT). Dr. Grant
    stated in his report that Wiley’s Oral Composite score of 71 (third percentile) and
    score of 52 (less than first percentile) on the EVT “indicated significant deficits
    in the area of communication skills.”        Dr. O’Brien also found deficits in
    communication skills, placing weight on Wiley’s school records.
    We note, as did the district court, that Dr. Macvaugh found no deficits in
    communication skills in part because affidavits in the record from Wiley’s family
    and friends indicated that he continued to correspond with them in written
    letters and by telephone after he was incarcerated. But Dr. Macvaugh qualified
    his opinion about the family affidavits by noting that because the affidavits had
    been prepared for the purpose of mitigation, “there is some concern with regard
    to their validity.” Dr. Swanson also indicated that Wiley’s ability to write was
    painfully slow, as shown by his taking two minutes to write six dictated words
    of a nine-word sentence.
    In the functional area of self direction, Dr. O’Brien testified that self-
    direction concerns whether a person can independently decide what to do and
    carry out certain activities without someone directing him. Self-direction skills
    are “related to making choices; learning and following a schedule; initiating
    activities appropriate to the setting, conditions, schedule, and personal interests;
    completing necessary or required tasks; seeking assistance when needed;
    resolving problems confronted in familiar and novel situations; and
    32
    No. 09-70037
    demonstrating appropriate assertiveness and self-advocacy skills.” AAMR 9th
    ed. at 40. The district court concluded that Wiley’s deficits in self-direction skills
    were supported by adaptive assessments by the experts, Wiley’s work history,
    his gambling and alcohol addictions, and reports from family and friends.
    The record shows that Wiley consistently relied on others for virtually all
    direction of his life and daily living, including finances, healthcare, and
    employment. Wiley relied on his grandmother and then his wife to handle his
    money. Although he was a hard worker, Wiley primarily worked manual labor
    jobs and relied on his in-laws to find him work. Wiley’s grandmother stated that
    when Wiley’s grandfather died, Wiley was unable to make basic decisions about
    the farm, and he instead sought advice from his grandfather’s friends. He later
    sought help from his in-laws even after he and his wife separated. As a child,
    Wiley was slow to master hygiene, dressing, and toileting skills, and his older
    sister had to help teach him how to dress and groom. Wiley’s grandmother
    bought his clothes and made selections for him when he was as old as fifteen,
    and then his wife took over that task when he moved in with her family.
    Although Wiley helped around the house with the trash and yard work, his
    grandmother and then his wife did all the cooking, cleaning, and laundering.
    Wiley indicated in probes with Dr. Swanson that his grandmother and his
    wife managed his money; after he separated from his wife he would cash his
    paychecks at the liquor store, pay his bills, and then drink or gamble his money
    away. When Wiley was in the Army, the military arranged all of his travel and
    someone always told him where to go. Dr. Swanson reported that in order to
    learn a new task Wiley required many repetitions, a lot of time, and continuous
    drill. She opined that military and court records and interviews with Wiley and
    his wife substantiate his poor self-direction as an adult. We conclude from the
    above evidence that the district court’s finding that Wiley had significant deficits
    in adaptive functioning skills was not clearly erroneous. See, e.g., Thomas, 607
    33
    No. 09-70037
    F.3d at 759 (finding of limitations in self-direction was not clearly erroneous
    where “record indicates Thomas was immature both socially and mentally, that
    he required lots of repetition to follow instructions, and that he could not live
    independently”).
    3. Onset before age eighteen
    In concluding that Wiley’s significant subaverage intellectual functioning
    and adaptive functioning deficits manifested prior to age eighteen, the district
    court relied on Wiley’s school records, reports of Wiley’s family members, and the
    adaptive assessments conducted by Dr. Swanson. The court also noted that
    Wiley’s military records, which documented Wiley’s service at age nineteen,
    provided a helpful snapshot of Wiley’s intellectual functioning and adaptive
    skills close in time to the age of eighteen.
    The State argues only that the Mississippi Supreme Court discounted
    Wiley’s school records because of Wiley’s poor attendance record at school, and
    that the state court’s decision was reasonable. However, we have already
    decided that the district court was not bound to defer to the state court decision.
    The State is correct that Wiley’s school records show numerous absences,
    and Dr. O’Brien agreed that missing school could result in poor grades. But he
    also testified that having difficulty in school could affect whether a person
    chooses to attend school regularly.      The district court noted that Wiley’s
    academic struggles commenced from the beginning of his formal education when
    he received all Ds, except for one C-, in the first grade. Wiley’s best year
    academically was in the sixth grade when he had the fewest absences, but that
    was also Wiley’s second attempt at sixth grade.
    We agree with the district court that evidence in addition to Wiley’s
    academic performance also supports the conclusion that Wiley’s deficits
    manifested before the age of eighteen. As noted by the district court, Wiley’s
    grandmother reported Wiley’s early childhood difficulties learning to speak,
    34
    No. 09-70037
    expressing his feelings, mastering hygiene and dressing skills, performing basic
    skills like making his bed and putting away his possessions, and requiring help
    with making purchases. Wiley’s wife later provided daily assistance, and the
    military records note physical and mental limitations just past Wiley’s
    eighteenth year. Based on the record, we do not find clear error in the district
    court’s determination.
    4. Malingering
    The final requirement for a finding of mental retardation is evidence
    through appropriate testing that Wiley is not malingering. The State does not
    address this requirement in its brief, but as noted by the district court, each of
    the experts who testified at the evidentiary hearing conducted testing to probe
    for malingering. Dr. O’Brien, Dr. Swanson, and Dr. Macvaugh each indicated
    that there was no evidence that Wiley was feigning or malingering intellectual
    or adaptive functioning deficits.18
    VI. Conclusion
    Based on the foregoing, we hold that the district court’s conclusion that
    Wiley is mentally retarded and therefore ineligible for a death sentence under
    Atkins was not clearly erroneous. The district court’s judgment is AFFIRMED.
    Judge Jolly concurs in the judgment only.
    18
    Dr. O’Brien tested Wiley with the 21 Word Test and found a “normal result” with “no
    indication of lack of motivation, dissimulation, or malingering.” Dr. Swanson administered the
    Rey’s 15-word List, which indicated “adequate effort and no signs of malingering were evident.”
    Dr. Macvaugh administered the Test of Memory Malingering (TOMM) to Wiley and concluded
    that “there was no indication that he attempted to feign cognitive deficits.”
    35