Robert Poyson v. Charles Ryan ( 2013 )


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  •                   FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    ROBERT ALLEN POYSON,                  No. 10-99005
    Petitioner-Appellant,
    D.C. No.
    v.                   2:04-cv-00534-NVW
    CHARLES L. RYAN,                   ORDER AND
    Respondent-Appellee.      AMENDED OPINION
    Appeal from the United States District Court
    for the District of Arizona
    Neil V. Wake, District Judge, Presiding
    Argued and Submitted
    February 15, 2012—San Francisco, California
    Filed March 22, 2013
    Amended November 7, 2013
    Before: Sidney R. Thomas, Raymond C. Fisher,
    and Sandra S. Ikuta, Circuit Judges.
    Order;
    Dissent to Order by Chief Judge Kozinski;
    Opinion by Judge Fisher;
    Partial Concurrence and Partial Dissent by Judge Thomas
    2                        POYSON V. RYAN
    SUMMARY*
    Habeas Corpus/Death Penalty
    The panel issued an order denying a petition for panel
    rehearing and rehearing en banc, filed an amended opinion,
    and ordered that no further petitions will be entertained.
    In the amended opinion, the panel affirmed the district
    court’s denial of a 
    28 U.S.C. § 2254
     habeas corpus petition by
    an Arizona state prisoner challenging a conviction and capital
    sentence for murder.
    The panel first held that the Arizona Supreme Court did
    not deny petitioner his right to individualized sentencing by
    applying an unconstitutional causal nexus test to potentially
    mitigating evidence, because the panel could not presume a
    constitutional violation from an ambiguous record that did
    not contain a “clear indication” that the court applied such a
    test as an unconstitutional screening mechanism, as opposed
    to a permissible means of determining the weight or
    significance of mitigating evidence.
    The panel next denied relief on petitioner’s claim that the
    Arizona courts failed to consider his history of substance
    abuse as a nonstatutory mitigating factor. The panel
    explained that the state courts considered the evidence and
    found it wanting as a matter of fact because it failed to prove
    a history of substance abuse, and that the state supreme court
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    POYSON V. RYAN                          3
    did not misconstrue the state trial court’s findings so as to
    deny petitioner of meaningful appellate review.
    Finally, the panel agreed with the district court that
    petitioner’s ineffective assistance of counsel claim is
    procedurally defaulted because it is fundamentally different
    from the claim presented in state court such that the state
    courts had no meaningful opportunity to consider it.
    Concurring in part and dissenting in part, Judge Thomas
    would hold that the state court unconstitutionally excluded
    mitigating evidence from consideration because it was not
    causally related to the crimes.
    Chief Judge Kozinski dissented from the denial of
    rehearing en banc, joined by Judges Pregerson, Reinhardt,
    Thomas, McKeown, Wardlaw, W. Fletcher, Paez, Berzon,
    Murguia, Christen and Watford. Chief Judge Kozinski
    adopted the explanation in Judge Thomas’ amended dissent
    that the majority’s decision, to declare the record too
    ambiguous to interpret, contravenes Supreme Court authority
    and undermines Circuit law. Chief Judge Kozinski pointed
    out that the court must “suture [a] fissure in our circuit law,”
    regarding the standard of review of a state court’s application
    of the causal nexus test.
    4                     POYSON V. RYAN
    COUNSEL
    Jon M. Sands, Federal Public Defender, Michael L. Burke
    (argued), Assistant Federal Public Defender, Ngozi V.
    Ndulue, Assistant Federal Public Defender, Phoenix, Arizona,
    for Petitioner-Appellant.
    Thomas C. Horne, Attorney General, Kent Cattani, Division
    Chief, Criminal Appeals/Capital Litigation Division, Jon G.
    Anderson (argued), Assistant Attorney General, Capital
    Litigation Section, Phoenix, Arizona, for Respondent-
    Appellee.
    ORDER
    Judge Thomas has voted to grant the petition for panel
    hearing and petition for rehearing en banc. Judges Fisher and
    Ikuta have voted to deny the petition for panel rehearing.
    Judge Ikuta has voted to deny the petition for rehearing en
    banc and Judge Fisher has so recommended.
    The full court was advised of the petition for rehearing en
    banc. A judge requested a vote on whether to rehear the
    matter en banc. The matter failed to receive a majority of the
    votes of the nonrecused active judges in favor of en banc
    consideration. Fed. R. App. P. 35(f).
    Appellant’s petition for panel rehearing and rehearing en
    banc, filed April 12, 2013, is denied. Chief Judge Kozinski’s
    dissent from denial of en banc rehearing is filed concurrently
    with this Order.
    POYSON V. RYAN                        5
    *****
    This opinion filed at 
    711 F.3d 1087
     (9th Cir. 2013) is
    amended, and an Amended Opinion is filed concurrently with
    this Order.
    No further petitions will be entertained.
    Chief Judge KOZINSKI, with whom Judges PREGERSON,
    REINHARDT, THOMAS, MCKEOWN, WARDLAW,
    W. FLETCHER, PAEZ, BERZON, MURGUIA, CHRISTEN
    and WATFORD join, dissenting from the order denying the
    petition for rehearing en banc:
    Just how obvious does a state court’s constitutional error
    have to be when a man’s life is on the line? According to the
    panel majority, indisputably obvious, which is “beyond a
    reasonable doubt” stood on its head. Judge Thomas’s
    powerful dissent explains how the majority’s decision to
    “throw up [its] hands and declare the record too ambiguous
    to definitively interpret one way or the other,” Amended
    Dissent at 49 n.3, contravenes Supreme Court authority and
    undermines our circuit law. See Tennard v. Dretke, 
    542 U.S. 274
     (2004); Eddings v. Oklahoma, 
    455 U.S. 104
     (1982);
    Lopez v. Ryan, 
    630 F.3d 1198
     (9th Cir. 2011). No need to
    repeat his arguments; we adopt them, chapter and verse.
    The issue will not go away. There are many more cases
    in the pipeline where state courts in our circuit applied a
    causal nexus test before affirming a sentence of death. We
    can’t long continue down the path forged by the majority,
    which forces panels to choose between two materially
    6                      POYSON V. RYAN
    different standards of review in causal nexus cases: the newly
    minted “clear indication” standard and our traditional
    approach of scrutinizing the record and asking whether it
    “appears” that a constitutional violation occurred. Styers v.
    Schriro, 
    547 F.3d 1026
    , 1035 (9th Cir. 2008).
    We must suture this fissure in our circuit law, and soon.
    Tragically for Robert Poyson, when we do so, it will come
    too late to save him. But come it will.
    OPINION
    FISHER, Circuit Judge:
    Robert Allen Poyson was convicted of murder and
    sentenced to death in 1998. After pursuing direct review and
    seeking postconviction relief in state court, he filed a habeas
    petition in federal district court. The district court denied the
    petition, and Poyson appeals.
    Poyson raises three claims on appeal, each of which has
    been certified by the district court pursuant to Fed. R. App. P.
    22(b) and 
    28 U.S.C. § 2253
    (c): (1) the Arizona courts applied
    an unconstitutional causal nexus test to mitigating evidence;
    (2) the Arizona courts failed to consider mitigating evidence
    of his history of substance abuse; and (3) his trial counsel
    provided ineffective assistance of counsel during the penalty
    phase of his trial by failing to investigate the possibility that
    he suffered from fetal alcohol spectrum disorder. We
    conclude the first two claims are without merit and the third
    is procedurally defaulted. Accordingly, we affirm.
    POYSON V. RYAN                         7
    The Arizona Supreme Court did not deny Poyson his right
    to individualized sentencing by applying an unconstitutional
    causal nexus screening test to potentially mitigating evidence.
    Under our case law, we cannot hold that a state court
    employed an unconstitutional nexus test “[a]bsent a clear
    indication in the record that the state court applied the wrong
    standard.” Schad v. Ryan, 
    671 F.3d 708
    , 724 (9th Cir. 2011)
    (per curiam). The record here shows that the Arizona
    Supreme Court considered the absence of a causal connection
    to the murders in evaluating Poyson’s mitigating evidence,
    but it does not reveal whether the court applied a nexus test
    as an unconstitutional screening mechanism or as a
    permissible means of determining the weight or significance
    of mitigating evidence. See Lopez v. Ryan, 
    630 F.3d 1198
    ,
    1203–04 (9th Cir. 2011). We therefore must hold that the
    Arizona Supreme Court’s decision was not “contrary to”
    Supreme Court precedent under 
    28 U.S.C. § 2254
    (d)(1). See
    Schad, 
    671 F.3d at
    723–24.
    We also deny habeas relief on Poyson’s claim that the
    Arizona courts failed to consider his history of substance
    abuse as a nonstatutory mitigating factor. Poyson argues that
    the state courts unconstitutionally refused to consider
    mitigating evidence, a claim arising under Lockett v. Ohio,
    
    438 U.S. 586
     (1978), and Eddings v. Oklahoma, 
    455 U.S. 104
    (1982). The state courts, however, did consider the evidence.
    They simply found it wanting as a matter of fact, finding that
    the evidence failed to prove a history of substance abuse.
    There was therefore no constitutional violation under Lockett
    and Eddings. Nor was there a constitutional violation under
    Parker v. Dugger, 
    498 U.S. 308
    , 321 (1991). The state
    supreme court did not misconstrue the state trial court’s
    findings, so it did not deprive Poyson of meaningful appellate
    review of his death sentence.
    8                     POYSON V. RYAN
    Finally, we agree with the district court that Poyson’s
    ineffective assistance of counsel claim is procedurally
    defaulted because it is fundamentally different from the claim
    presented in state court. Although it is true that “new factual
    allegations do not ordinarily render a claim unexhausted, a
    petitioner may not ‘fundamentally alter the legal claim
    already considered by the state courts.’” Beaty v. Stewart,
    
    303 F.3d 975
    , 989–90 (9th Cir. 2002) (quoting Vasquez v.
    Hillery, 
    474 U.S. 254
    , 260 (1986)). Poyson’s federal petition
    raises a theory of deficient performance – failure to
    investigate and present mitigating evidence of fetal alcohol
    spectrum disorder – that the state courts had no “meaningful
    opportunity to consider.” Vasquez, 
    474 U.S. at 257
    . The
    claim is therefore procedurally defaulted.
    I. BACKGROUND
    A. The Crimes
    Poyson was born in August 1976. The facts of his crimes,
    committed in 1996, were summarized as follows by the
    Arizona Supreme Court in State v. Poyson, 
    7 P.3d 79
    , 83
    (Ariz. 2000).
    Poyson met Leta Kagen, her 15 year-old son, Robert
    Delahunt, and Roland Wear in April 1996. Poyson was then
    19 years old and homeless. Kagen allowed him to stay with
    her and the others at their trailer in Golden Valley, near
    Kingman, Arizona. In August of the same year, Kagen was
    introduced to 48 year-old Frank Anderson and his 14 year-old
    girlfriend, Kimberly Lane. They, too, needed a place to live,
    and Kagen invited them to stay at the trailer.
    POYSON V. RYAN                          9
    Anderson informed Poyson that he was eager to travel to
    Chicago, where he claimed to have organized crime
    connections. Because none of them had a way of getting to
    Chicago, Anderson, Poyson and Lane formulated a plan to
    kill Kagen, Delahunt and Wear in order to steal the latter’s
    truck.
    On the evening of August 13, 1996, Lane lured Delahunt
    into a small travel trailer on the property, ostensibly for sex.
    There, Anderson commenced an attack on the boy by slitting
    his throat with a bread knife. Poyson heard Delahunt’s
    screams and ran to the travel trailer. While Anderson held
    Delahunt down, Poyson bashed his head against the floor.
    Poyson also beat Delahunt’s head with his fists, and pounded
    it with a rock. This, however, did not kill Delahunt, so
    Poyson took the bread knife and drove it through his ear.
    Although the blade penetrated Delahunt’s skull and exited
    through his nose, the wound was not fatal. Poyson thereafter
    continued to slam Delahunt’s head against the floor until
    Delahunt lost consciousness. According to the medical
    examiner, Delahunt died of massive blunt force head trauma.
    In all, the attack lasted about 45 minutes.
    After cleaning themselves up, Poyson and Anderson
    prepared to kill Kagen and Wear. They first located Wear’s
    .22 caliber rifle. Unable to find ammunition, Poyson
    borrowed two rounds from a young girl who lived next door,
    telling her that Delahunt was in the desert surrounded by
    snakes and the bullets were needed to rescue him. Poyson
    loaded the rifle and tested it for about five minutes to make
    sure it would function properly. He then stashed it near a
    shed. Later that evening, he cut the telephone line to the
    trailer so that neither of the remaining victims could call for
    help.
    10                     POYSON V. RYAN
    After Kagen and Wear were asleep, Poyson and Anderson
    went into their bedroom. Poyson first shot Kagen in the head,
    killing her instantly. After quickly reloading the rifle, he shot
    Wear in the mouth, shattering Wear’s upper right teeth. A
    struggle ensued, during which Poyson repeatedly clubbed
    Wear in the head with the rifle. The fracas eventually moved
    outside. At some point, Anderson threw a cinder block at
    Wear, hitting him in the back and knocking him to the
    ground. While the victim was lying there, Poyson twice
    kicked him in the head. He then picked up the cinder block
    and threw it several times at Wear’s head. After Wear
    stopped moving, Poyson took his wallet and the keys to
    Wear’s truck. To conceal the body, Poyson covered it with
    debris from the yard. Poyson, Anderson and Lane then took
    the truck and traveled to Illinois, where they were
    apprehended several days later.
    B. Trial and Conviction
    A grand jury indicted Poyson on three counts of first
    degree murder, one count of conspiracy to commit murder
    and one count of armed robbery. The jury convicted on all
    counts in March 1998, following a six-day trial.
    C. Sentencing
    1. Mitigation Investigation
    Following the guilty verdicts, the state trial court
    approved funds to hire a mitigation specialist to assist in
    preparing for Poyson’s sentencing. Counsel retained
    investigator Blair Abbott.
    POYSON V. RYAN                       11
    In a June 1998 memorandum, Abbott informed counsel
    that Poyson’s mother, Ruth Garcia (Garcia), used drugs
    during the first trimester of her pregnancy and recommended
    that counsel investigate the possibility that Poyson suffered
    brain damage as a result. The memorandum advised counsel
    that “one of the significant issues should be the hard core
    drug abuse of both [of Poyson’s] parents, preconception and
    in the first trimester of Ruth’s pregnancy.” Abbott wrote that
    “Ruth Garcia’s heavy drug abuse in the pre pregnancy and
    early on in the pregnancy undoubtedly caused severe damage
    to her unborn child.”
    In September 1998, Abbott mailed trial counsel “Library
    & Internet research regarding drug & alcohol fetal cell
    damage; reflecting how these chemicals when taken in the
    first trimester [a]ffect subsequent intelligence, conduct,
    emotions, urges etc [sic] as the child grows into adulthood.”
    2. Presentence Investigation Report
    The probation office prepared a presentence investigation
    report in July 1998. Poyson told the probation officer that he
    had a bad childhood because he was abused by a series of
    stepfathers, who subjected him to physical, mental and
    emotional abuse. Poyson also said he suffered from
    impulsive conduct disorder, which was diagnosed when he
    was 13. Poyson would not answer any questions on his
    substance abuse history or juvenile record.
    3. Presentencing Hearing
    In October 1998, the trial court held a one-day
    presentencing hearing. Poyson’s trial counsel called three
    witnesses to present mitigating evidence: his aunt, Laura
    12                        POYSON V. RYAN
    Salas, his mother, Ruth Garcia, and the mitigation
    investigator, Blair Abbott. Counsel also introduced 56
    exhibits. Poyson did not testify. The witnesses testified
    about Poyson’s drug and alcohol abuse and the mental and
    physical abuse inflicted on Poyson by his stepfather,
    Guillermo Aguilar, and maternal grandmother, Mary Milner.
    They also testified that Poyson’s stepfather, Sabas Garcia
    (Sabas), committed suicide in 1988, and that Sabas’ death had
    a devastating effect on Poyson. They further testified that
    Garcia used drugs and alcohol during the first three months
    of her pregnancy with Poyson.
    4. Poyson’s Sentencing Memorandum
    In early November 1998, Poyson filed a sentencing
    memorandum urging the court to find three statutory and 25
    nonstatutory mitigating circumstances.1 As relevant here,
    Poyson argued that his history of drug and alcohol abuse,
    troubled childhood and personality disorders constituted both
    statutory and nonstatutory mitigating circumstances.
    1
    At the time of Poyson’s sentencing, Arizona law required the
    sentencing judge to impose a sentence of death if the court found one or
    more aggravating circumstances and “no mitigating circumstances
    sufficiently substantial to call for leniency.” 
    Ariz. Rev. Stat. Ann. § 13
    -
    703(E) (1998). The law enumerated 10 aggravating circumstances, see 
    id.
    § 13-703(F), and five statutory mitigating circumstances – including
    diminished capacity, duress, minor participation and the defendant’s age,
    see id. § 13-703(G). The sentencing court also was required to consider
    any nonstatutory mitigating circumstances offered by the defendant – i.e.,
    “any factors proffered by the defendant or the state which are relevant in
    determining whether to impose a sentence less than death, including any
    aspect of the defendant’s character, propensities or record and any of the
    circumstances of the offense.” Id.
    POYSON V. RYAN                        13
    Substance Abuse: Poyson argued that his substance abuse
    was a statutory mitigating circumstance because it impaired
    his capacity to appreciate the wrongfulness of his conduct or
    conform his conduct to the requirements of law at the time of
    the murders. See 
    Ariz. Rev. Stat. Ann. § 13-703
    (G)(1)
    (1998). In the alternative, he argued that, even if his
    substance abuse was not causally related to the murders, it
    constituted a nonstatutory mitigating circumstance. In
    support of these arguments, Poyson emphasized his biological
    parents’ use of drugs and alcohol at the time of his
    conception, his mother’s use of drugs and alcohol during
    pregnancy, an incident in which Poyson was involuntarily
    intoxicated at the age of three or four, Poyson’s abuse of
    alcohol beginning at age 13 and Poyson’s five-month
    placement at WestCare, a residential treatment facility, for
    substance abuse treatment in 1992, when he was 15. Poyson
    also pointed to evidence that he used PCP two days before the
    murders, used alcohol the night before the murders, used
    marijuana the day of the murders and had suffered a PCP
    flashback during Delahunt’s murder.
    Troubled Childhood: Poyson argued that his troubled
    childhood was a statutory mitigating circumstance because it
    affected his behavior at the time of the murders. In the
    alternative, he argued that his troubled childhood constituted
    a nonstatutory mitigating circumstance. Poyson emphasized
    his mother’s use of drugs and alcohol during the first
    trimester of pregnancy. He argued that alcohol and drug use
    during pregnancy can cause brain damage and birth defects
    and lead a child to engage in delinquent and criminal
    behavior. He also attached to the sentencing memorandum
    several scientific articles on fetal alcohol syndrome. The
    memorandum pointed out that Poyson never knew his
    biological father, lacked a stable home life, was physically
    14                     POYSON V. RYAN
    and mentally abused by several adults (including Aguilar and
    Milner), was devastated by Sabas’ suicide and was sexually
    abused and sodomized at a young age.2 Poyson emphasized
    that his delinquent behavior and substance abuse began
    shortly after the death of Sabas and the sexual assault.
    Mental Health Issues: The sentencing memorandum
    argued that Poyson suffered from several personality
    disorders, constituting a nonstatutory mitigating
    circumstance. The memorandum pointed to a 1990
    psychiatric evaluation by Dr. Bruce Guernsey. According to
    the sentencing memorandum, Guernsey diagnosed Poyson
    with severe “conduct disorder,” reported that Poyson
    exhibited symptoms of antisocial behavior, “manic
    depression” or “impulsive conduct disorder” and
    recommended that Poyson be prescribed medication to
    control his behavior. Poyson also pointed to a 1990 Juvenile
    Predisposition Investigation by Nolan Barnum. Barnum too
    recommended that Poyson be prescribed medication to
    control his behavior. A 1993 psychological evaluation
    performed by Jack Cordon and Ronald Jacques from the State
    Youth Services Center in St. Anthony, Idaho, diagnosed
    Poyson with “mild mood disturbance.” Dr. Celia A. Drake,
    who Poyson’s counsel retained to perform a forensic
    evaluation of Poyson, diagnosed “Adjustment Disorder with
    depressive mood, mild intensity,” and “Anti-social
    Personality Disorder.” Dr. Drake found Poyson’s overall
    intellectual functioning to be “in the low average range.”
    2
    Poyson presented evidence that he was sexually assaulted by a
    neighbor on one occasion shortly after Sabas’ death.
    POYSON V. RYAN                              15
    5. Sentencing Hearing and Imposition of Sentence
    The trial court held a sentencing hearing and imposed
    sentence in late November 1998.
    The court found that the state had proved, beyond a
    reasonable doubt, three aggravating circumstances for the
    murders of Delahunt and Wear: the murders were committed
    in expectation of pecuniary gain, the murders were especially
    cruel and multiple homicides committed during the same
    offense. See 
    Ariz. Rev. Stat. Ann. § 13-703
    (F)(5), (6), (8)
    (1998). The court found two aggravating circumstances
    applicable to Kagen’s murder: pecuniary gain and multiple
    homicides. See 
    id.
     § 13-703(F)(5), (8).
    The court found that Poyson failed to prove any statutory
    mitigating factors. Poyson’s difficult childhood and mental
    health issues were not statutory mitigating factors under § 13-
    703(G)(1) because they did not significantly impair Poyson’s
    capacity to appreciate the wrongfulness of his conduct or to
    conform his conduct to the requirements of law.3 The court
    explained:
    There has certainly been evidence that the
    defendant had gone through a turbulent life,
    perhaps had mental-health issues that would
    distinguish him from the typical person on the
    street.
    3
    See 
    Ariz. Rev. Stat. Ann. § 13-703
    (G)(1) (1998) (“Mitigating
    circumstances [include] [t]he defendant’s capacity to appreciate the
    wrongfulness of his conduct or to conform his conduct to the requirements
    of law was significantly impaired, but not so impaired as to constitute a
    defense to prosecution.”).
    16                     POYSON V. RYAN
    Listening to his description of how these
    murders were committed, based upon a
    description of somewhat a methodical
    carrying out of a plan, the Court sees
    absolutely nothing on the record, in this case,
    to suggest the applicability of this mitigating
    circumstance.
    Turning to nonstatutory mitigating factors, the court first
    explained the three-step analysis it used to evaluate each
    nonstatutory mitigating circumstance proffered by Poyson:
    “[1] to analyze whether the defense has shown this fact by a
    preponderance of evidence, and then if they have, [2] to
    determine whether I would assign that any weight as a
    mitigating factor, and of course, for any that . . . pass both of
    those two tests, [3] I have to weigh them all along with the
    other factors in the final [sentencing] determination in this
    case.”
    Mental Health Issues: The court rejected Poyson’s
    mental health issues as a nonstatutory mitigating factor at the
    second step in the analysis. The court found that Poyson had
    proven that he suffered from personality disorders, but gave
    them no weight because they were not causally related to the
    murders:
    [T]he defendant had some mental health and
    psychological issues. I think . . . the defense
    has established that there were certain . . .
    personality disorders that the defendant, in
    fact, may have been suffering from.
    The Court, however, does not find that
    they rise to the level of being a mitigating
    POYSON V. RYAN                               17
    factor because I am unable to draw any
    connection whatsoever with such personality
    disorders and the commission of these
    offenses.4
    Troubled Childhood: The court similarly rejected
    Poyson’s difficult childhood as a nonstatutory mitigating
    factor. At step one, the court found that the “defense has
    shown that defendant suffered a dysfunctional childhood, that
    he was subjected to physical and sexual abuse, and that he
    was subjected to certain levels of mental abuse.” At step two,
    however, the court gave these circumstances no mitigating
    weight because they were not causally connected to the
    murders: “The Court finds absolutely nothing in this case to
    suggest that his latter conduct was a result of his childhood.”5
    4
    The court rejected evidence of Poyson’s low IQ for similar reasons.
    At the first step in the analysis, the court found that “there is certain
    evidence in this case that would support the proposition that the
    defendant’s mental capacity may be diminished, at least compared to the
    norm in the population, and that his I.Q. may be low, at least compared to
    the norm in the population.” The court, however, gave this circumstance
    no mitigating weight in light of planning and sophistication that went into
    the crimes – “certain prep[ar]atory steps that were taken – admittedly, not
    overly-sophisticated, but attempts were made to do certain things, to
    disable warning systems to enable these murders to be committed and to
    get away with the loot that was the purpose of the murders; specifically,
    the vehicle.”
    5
    The court also found that “the defense has established, by a
    preponderance of the evidence, that the defendant lost a parent figure and
    was subjected to sexual abuse at a relatively young age.” The court
    rejected this factor at step two, however, because it was “not convinced
    that there is any connection between that abuse, that loss, and his
    subsequent criminal behavior.”
    18                   POYSON V. RYAN
    Substance Abuse: Finally, the court rejected Poyson’s
    history of substance abuse at both steps one and two in the
    analysis: Poyson failed to establish a significant history of
    drug or alcohol abuse and, even if he could do so, the court
    would have given the evidence no weight because he failed
    to establish a causal connection between the substance abuse
    and the crimes. The court said:
    The argument is made that the defendant was
    subjected to alcohol abuse and drug abuse.
    Other than very vague allegations that he has
    used alcohol in the past or has used drugs in
    the past, other than a fairly vague assertion
    that he was subject to some sort of effect of
    drugs and/or alcohol at the time, that these
    offenses were committed, I really find very
    little to support the allegation that the
    defendant has a significant alcohol and/or
    drug abuse, and again, going back to the
    methodical steps that were taken to murder
    three people to get a vehicle to get out of
    Golden Valley, it’s very difficult for me to
    conclude that the defendant’s ability to engage
    in goal-oriented behavior was, in any way,
    impaired at the time of the commission of
    these offenses.
    The court found only one nonstatutory mitigation factor
    – Poyson’s cooperation with law enforcement. The court
    concluded that this one mitigating factor was insufficiently
    substantial to call for leniency and imposed a sentence of
    death.
    POYSON V. RYAN                         19
    6. Arizona Supreme Court Decision
    The Arizona Supreme Court affirmed Poyson’s
    conviction and sentence on direct appeal. See State v.
    Poyson, 
    7 P.3d 79
     (Ariz. 2000). As required by Arizona law,
    the court “independently review[ed] the trial court’s findings
    of aggravation and mitigation and the propriety of the death
    sentence.” 
    Ariz. Rev. Stat. Ann. § 13-703.01
    (A) (2000).
    The court agreed with the trial court that Poyson’s drug
    use was not a statutory mitigating circumstance under § 13-
    703(G)(1). See Poyson, 
    7 P.3d at
    88–89. In the court’s view,
    there was “scant evidence that he was actually intoxicated on
    the day of the murders.” 
    Id. at 88
    . “Although Poyson
    purportedly used both marijuana and PCP ‘on an as available
    basis’ in days preceding these crimes, the only substance he
    apparently used on the date in question was marijuana,” and
    Poyson “reported smoking the marijuana at least six hours
    before killing Delahunt and eleven hours before the murders
    of Kagen and Wear.” 
    Id.
     The evidence that Poyson
    experienced a PCP flashback during the murder of Delahunt
    was not credible, and even if the flashback occurred, it lasted
    only a “few moments.” 
    Id.
     at 88–89. Poyson was “not under
    the influence of PCP at any other time.” 
    Id. at 89
    . Poyson’s
    claims of substantial impairment were also belied by his
    deliberate actions, including concocting a ruse to obtain
    bullets from a neighbor, testing the rifle to make sure it would
    work properly when needed, cutting the telephone line and
    concealing the crimes. See 
    id.
    Substance Abuse: The court also agreed with the trial
    court that Poyson’s substance abuse, mental health and
    abusive childhood were not nonstatutory mitigating
    circumstances. As to substance abuse, the court agreed with
    20                    POYSON V. RYAN
    the trial court that Poyson had failed at step one because the
    evidence did not show a history of drug or alcohol abuse:
    The trial judge refused to accord any weight
    to the defendant’s substance abuse as a
    nonstatutory mitigating circumstance. It
    characterized the defendant’s claims that he
    had used drugs or alcohol in the past or was
    under the influence of drugs on the day of the
    murders as little more than “vague
    allegations.” As discussed above, we agree.
    
    Id. at 90
    .
    Mental Health Issues: With respect to mental health
    issues, the court agreed with the trial court that Poyson’s
    personality disorders, although proven at step one, were
    entitled to no weight at step two because they were not
    causally connected to the murders:
    The trial court found that Poyson suffers from
    “certain personality disorders” but did not
    assign any weight to this factor. Dr. Celia
    Drake diagnosed the defendant with antisocial
    personality disorder, which she attributed to
    the “chaotic environment in which he was
    raised.” She found that there was, among
    other things, no “appropriate model for moral
    reasoning within the family setting” to which
    the defendant could look for guidance.
    However, we find no indication in the record
    that “the disorder controlled [his] conduct or
    impaired his mental capacity to such a degree
    that leniency is required.” State v. Brewer,
    POYSON V. RYAN                      21
    
    170 Ariz. 486
    , 505, 
    826 P.2d 783
    , 802 (1992);
    see also [State v. Medina, 
    193 Ariz. 504
    , 517,
    
    975 P.2d 94
    , 107 (1999)] (holding that the
    defendant’s personality disorder “ha[d] little
    or no mitigating value” where the defendant’s
    desire to emulate his friends, not his mental
    disorder, was the cause of his criminal
    behavior). We therefore accord this factor no
    mitigating weight.
    
    Id.
     at 90–91.
    Troubled Childhood: The court also agreed with the trial
    court’s assessment of Poyson’s troubled childhood. The
    court found that Poyson established an abusive childhood at
    step one, but gave this consideration no weight at step two
    because of the absence of a causal nexus:
    Defendant presented some evidence that as a
    youngster he was physically and mentally
    abused by several stepfathers and his maternal
    grandmother. He also self-reported one
    instance of sexual assault by a neighbor.
    Again, however, defendant did not show that
    his traumatic childhood somehow rendered
    him unable to control his conduct. Thus, the
    evidence is without mitigating value.
    Id. at 91.
    The court found three aggravating factors (pecuniary gain,
    murder committed in an especially cruel manner and multiple
    homicides), one statutory mitigating factor (Poyson’s age)
    and three nonstatutory mitigating factors (cooperation with
    22                        POYSON V. RYAN
    law enforcement, potential for rehabilitation and family
    support). See id. at 90–91.6 The court concluded that the
    mitigating evidence was not sufficiently substantial to call for
    leniency and affirmed the sentence of death. See id. at 91–92;
    
    Ariz. Rev. Stat. Ann. § 13-703.1
    (B) (2000).
    D. State Postconviction Review
    The Arizona Superior Court denied Poyson’s petition for
    postconviction relief in 2003. The court provided a reasoned
    decision on Poyson’s claim of penalty phase ineffective
    assistance of counsel (his third claim in this appeal) but not
    on Poyson’s claims that the Arizona courts failed to consider
    relevant mitigating evidence (his first and second claims on
    appeal). In 2004, the Arizona Supreme Court summarily
    denied Poyson’s petition for review.
    E. Federal District Court Proceedings
    Poyson filed a federal habeas petition in 2004. In 2010,
    the district court denied the petition. The court rejected on
    the merits Poyson’s claims that the Arizona courts failed to
    consider mitigating evidence. The court concluded that
    Poyson’s penalty phase ineffective assistance of counsel
    claim was procedurally defaulted because it was
    “fundamentally different than [the claim] presented in state
    court.” Poyson timely appealed.
    6
    The Arizona Supreme Court thus found three more mitigating factors
    than the trial court found. The appellate court nonetheless agreed with the
    trial court that a death sentence was warranted.
    POYSON V. RYAN                         23
    II. JURISDICTION AND STANDARD OF REVIEW
    We have jurisdiction under 
    28 U.S.C. §§ 1291
     and
    2253(a). We review de novo the district court’s denial of
    Poyson’s petition for habeas corpus, and we review the
    district court’s findings of fact for clear error. See Brown v.
    Ornoski, 
    503 F.3d 1006
    , 1010 (9th Cir. 2007). Dismissals
    based on procedural default are reviewed de novo. See
    Robinson v. Schriro, 
    595 F.3d 1086
    , 1099 (9th Cir. 2010).
    We address Poyson’s three claims in turn.
    III. DISCUSSION
    A. Causal Nexus Test
    Poyson argues that the Arizona courts applied an
    unconstitutional causal nexus test to mitigating evidence of
    his mental health issues, traumatic childhood and substance
    abuse history, in violation of his Eighth and Fourteenth
    Amendment rights to an individualized sentencing. He
    contends that the state courts improperly refused to consider
    this evidence in mitigation because he failed to establish a
    causal connection between the evidence and the murders. He
    argues that the state courts’ actions violate his constitutional
    rights as recognized in Tennard v. Dretke, 
    542 U.S. 274
    ,
    283–87 (2004), Smith v. Texas, 
    543 U.S. 37
    , 45 (2004) (per
    curiam), and several earlier decisions. These decisions hold
    that requiring a defendant to prove a nexus between
    mitigating evidence and the crime is “a test we never
    countenanced and now have unequivocally rejected.” Smith,
    
    543 U.S. at 45
    .
    Because Poyson filed his federal habeas petition after
    April 24, 1996, he must not only prove a violation of these
    24                    POYSON V. RYAN
    rights but also satisfy the Antiterrorism and Effective Death
    Penalty Act of 1996 (AEDPA). See Fenenbock v. Dir. of
    Corr. for Cal., 
    681 F.3d 968
    , 973 (9th Cir. 2012).
    Under AEDPA, we may not grant habeas relief with
    respect to any claim adjudicated on the merits in state court
    unless the state court’s decision was “contrary to, or involved
    an unreasonable application of, clearly established Federal
    law, as determined by the Supreme Court of the United
    States,” or “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). We review the last
    reasoned state court decision addressing the claim, which for
    Poyson’s causal nexus claim is the Arizona Supreme Court’s
    decision affirming Poyson’s death sentence on direct appeal.
    See Crittenden v. Ayers, 
    624 F.3d 943
    , 950 (9th Cir. 2010).
    Poyson relies on AEDPA’s “contrary to” prong, arguing that
    the Arizona Supreme Court’s decision in State v. Poyson,
    
    7 P.3d 79
     (Ariz. 2000), was contrary to Lockett v. Ohio,
    
    438 U.S. 586
     (1978), Eddings v. Oklahoma, 
    455 U.S. 104
    (1982), and Penry v. Lynaugh, 
    492 U.S. 302
     (1989),
    abrogated on other grounds by Atkins v. Virginia, 
    536 U.S. 304
     (2002).
    1. Exhaustion
    As a threshold matter, we agree with Poyson that he has
    fully exhausted this claim. The state argues that in state court
    Poyson raised a causal nexus claim with respect to only
    mental health issues and his troubled childhood, not his
    history of substance abuse. We disagree. Having reviewed
    the record, we conclude that Poyson exhausted the claim with
    respect to all three categories of mitigating evidence. See
    Powell v. Lambert, 
    357 F.3d 871
    , 874 (9th Cir. 2004) (“A
    POYSON V. RYAN                        25
    petitioner has exhausted his federal claims when he has fully
    and fairly presented them to the state courts.”).
    2. Whether the Arizona Supreme Court’s Decision Was
    Contrary to Clearly Established Federal Law
    Lockett, Eddings and Penry held that “a State could not,
    consistent with the Eighth and Fourteenth Amendments,
    prevent the sentencer from considering and giving effect to
    evidence relevant to the defendant’s background or character
    or to the circumstances of the offense that mitigate against
    imposing the death penalty.” Penry, 
    492 U.S. at 318
    . “[I]t is
    not enough simply to allow the defendant to present
    mitigating evidence to the sentencer.” 
    Id. at 319
    . “The
    sentencer must also be able to consider and give effect to that
    evidence in imposing sentence.” 
    Id.
     “[T]he sentence imposed
    at the penalty stage should reflect a reasoned moral response
    to the defendant’s background, character, and crime.” 
    Id.
    (quoting California v. Brown, 
    479 U.S. 538
    , 545 (1987)
    (O’Connor, J., concurring)) (internal quotation marks
    omitted).
    Under these decisions, a state court may not treat
    mitigating evidence of a defendant’s background or character
    as “irrelevant or nonmitigating as a matter of law” merely
    because it lacks a causal connection to the crime. Towery v.
    Ryan, 
    673 F.3d 933
    , 946 (9th Cir. 2012) (per curiam). The
    sentencer may, however, consider “causal nexus . . . as a
    factor in determining the weight or significance of mitigating
    evidence.” Lopez v. Ryan, 
    630 F.3d 1198
    , 1204 (9th Cir.
    2011). “The . . . use of the nexus test in this manner is not
    unconstitutional because state courts are free to assess the
    weight to be given to particular mitigating evidence.” Schad
    26                    POYSON V. RYAN
    v. Ryan, 
    671 F.3d 708
    , 723 (9th Cir. 2011) (per curiam). As
    the Court explained in Eddings:
    Just as the State may not by statute preclude
    the sentencer from considering any mitigating
    factor, neither may the sentencer refuse to
    consider, as a matter of law, any relevant
    mitigating evidence. . . . The sentencer, and
    the Court of Criminal Appeals on review, may
    determine the weight to be given relevant
    mitigating evidence. But they may not give it
    no weight by excluding such evidence from
    their consideration.
    Eddings, 
    455 U.S. at
    113–15.
    Consistent with these principles, we have granted habeas
    relief when state courts have applied a causal nexus test as a
    screening mechanism to deem evidence irrelevant or
    nonmitigating as a matter of law. In Styers v. Schriro,
    
    547 F.3d 1026
     (9th Cir. 2008) (per curiam), we granted relief
    where the state court held that a defendant’s post-traumatic
    stress disorder could not constitute mitigation unless the
    defendant could connect the condition to the crime. See 
    id. at 1035
    . In Williams v. Ryan, 
    623 F.3d 1258
     (9th Cir. 2010),
    we granted relief where the state court held that, “[w]ithout
    a showing of some impairment at the time of the offense,
    drug use cannot be a mitigating circumstance of any kind.”
    
    Id.
     at 1270–71 (alteration in original) (quoting State v.
    Williams, 
    904 P.2d 437
    , 453 (Ariz. 1995)) (internal quotation
    marks omitted).
    In contrast, we have refused to find a constitutional
    violation when the state court employed a causal nexus test as
    POYSON V. RYAN                         27
    a permissible weighing mechanism. See Towery, 673 F.3d at
    945–46. We have also denied relief when the record contains
    no indication that the state court employed a causal nexus test
    at all. See Schad, 
    671 F.3d at 724
     (denying relief where
    “there is no indication that the state courts applied a nexus
    test, either as a method of assessing the weight of the
    mitigating evidence, or as an unconstitutional screening
    mechanism to prevent consideration of any evidence”);
    Lopez, 
    630 F.3d at
    1203–04 (denying relief where the state
    courts made no mention of a causal nexus test, because “there
    is no reason to infer unconstitutional reasoning from judicial
    silence”).
    Here, the record shows that the Arizona Supreme Court
    applied a causal nexus test to Poyson’s evidence of mental
    health issues and a difficult childhood, see Poyson, 
    7 P.3d at
    90–91, but does not reveal whether the court considered the
    absence of a causal nexus as a permissible weighing
    mechanism, as in Towery, or as an unconstitutional screening
    mechanism, as in Styers and Williams. This ambiguity
    precludes us from granting habeas relief. We held in Schad
    that, “[a]bsent a clear indication in the record that the state
    court applied the wrong standard, we cannot assume the
    courts violated Eddings’s constitutional mandates.” 
    671 F.3d at 724
    . That principle governs here: we cannot assume the
    state court applied the wrong standard. The Arizona Supreme
    Court’s decision therefore was not contrary to clearly
    established federal law under § 2254(d)(1).
    We reach the same conclusion with respect to the Arizona
    Supreme Court’s evaluation of Poyson’s evidence of a history
    of substance abuse. The state court rejected this evidence at
    step one in its analysis, finding as a matter of fact that Poyson
    had failed to establish a significant history of substance abuse
    28                    POYSON V. RYAN
    by a preponderance of the evidence. The record does not
    indicate that the court considered this evidence at step two, or
    that, if it did so, it employed an impermissible causal nexus
    test in doing so. See Poyson, 
    7 P.3d at 90
    . The court’s
    treatment of Poyson’s substance abuse evidence thus was
    likewise not contrary to Lockett, Eddings and Penry.
    We recognize the possibility that the Arizona Supreme
    Court applied an unconstitutional causal nexus test. The
    record, however, contains no clear indication that the court
    did so. We may not presume a constitutional violation from
    an ambiguous record. We therefore hold that the district
    court properly denied habeas relief on Poyson’s causal nexus
    claim. See Schad, 
    671 F.3d at 724
    .
    The dissent contends that Schad’s presumption that state
    courts follow constitutional requirements should not apply
    here for six reasons. First, the dissent argues that we should
    find error in Poyson’s case based on the Arizona Supreme
    Court’s use of an unconstitutional causal nexus test in other
    cases at the time of Poyson’s sentencing. Dissent 43. This
    argument might be persuasive if the Arizona courts
    consistently applied an unconstitutional causal nexus test
    during the relevant period. That is not the case, however. As
    we recognized in Lopez,
    Our review of the case law confirms
    Arizona’s unsettled past with respect to this
    issue. Some cases decided prior to Tennard
    applied a causal nexus requirement in an
    impermissible manner. Other cases, however,
    properly looked to causal nexus only as a
    factor in determining the weight or
    significance of mitigating evidence.
    POYSON V. RYAN                              29
    
    630 F.3d at
    1203–04 (footnote omitted); see also Towery,
    673 F.3d at 946 (also recognizing that the Arizona Supreme
    Court’s decisions have been inconsistent on this question).
    Under these circumstances, the most we can say is that
    Arizona’s troublesome history weakens the presumption that
    the Arizona Supreme Court followed the law in Poyson’s
    case; it does not flip the presumption altogether.7
    Second, the dissent argues that the presumption that state
    courts follow constitutional mandates applies only to a silent
    record and not to the interpretation of a state court’s
    language. Dissent 47. This argument overlooks the Supreme
    Court’s decision in Woodford v. Visciotti, 
    537 U.S. 19
     (2002).
    There, the state court applied an arguably erroneous test for
    determining prejudice under Strickland v. Washington,
    
    466 U.S. 468
     (1984). Some language in the state court’s
    decision cited the test correctly, whereas other language
    misstated the test. See Visciotti, 
    537 U.S. at
    22–24. We held
    that the state court had applied an erroneous test, but the
    Supreme Court reversed, holding that our “readiness to
    attribute error is inconsistent with the presumption that state
    courts know and follow the law.” 
    Id. at 24
    . After Visciotti,
    therefore, we must consider the presumption that state courts
    follow the law not only when we draw inferences from the
    court’s silence but also when, as here, we construe a state
    court’s ambiguous language.
    7
    Under circuit precedent, moreover, our focus must be on the record in
    this case. See Lopez, 
    630 F.3d at 1204
     (“In light of this backdrop, which
    highlights a range of treatment of the nexus issue, there is no reason to
    infer unconstitutional reasoning from judicial silence. Rather, we must
    look to what the record actually says.”); Towery, 673 F.3d at 946. We
    reject the suggestion that because other Arizona cases may have involved
    causal nexus error we should presume that this case did as well.
    30                    POYSON V. RYAN
    Third, quoting Justice O’Connor’s concurrence in
    Eddings, the dissent argues that “the qualitatively different
    nature of a death sentence requires reviewing courts ‘to
    remove any legitimate basis for finding ambiguity concerning
    the factors actually considered by the trial court.’” Dissent 47
    (quoting Eddings, 
    455 U.S. at 119
     (O’Connor, J.,
    concurring)). A majority of the Court, however, has never
    adopted Justice O’Connor’s suggestion that ambiguity alone
    requires habeas relief. Unlike Eddings, moreover, this case
    is governed by AEDPA, and AEDPA does not allow us to
    presume from an ambiguous record that the state court
    applied an unconstitutional standard. To the contrary, such
    a “readiness to attribute error” would be flatly “incompatible
    with § 2254(d)’s highly deferential standard for evaluating
    state-court rulings, which demands that state-court decisions
    be given the benefit of the doubt.” Visciotti, 
    537 U.S. at 24
    (citation and internal quotation marks omitted); cf. Lopez v.
    Schriro, 
    491 F.3d 1029
    , 1037 (9th Cir. 2007) (holding that
    alleged ambiguity in the state court’s language was
    insufficient “to overcome the presumption that the state court
    knew and followed the law”).
    Fourth, according to the dissent, our holding imposes a
    heightened standard of proof on the petitioner and means that
    “a habeas petitioner can secure relief only by conclusively
    establishing the absence of any ambiguity in the state court
    record.” Dissent 49. Not so. The problem in this case is not
    the existence of some ambiguity in the record; it is that the
    record is insolubly ambiguous, cf. Doyle v. Ohio, 
    426 U.S. 610
    , 617 (1976), meaning that the record is inconclusive as to
    whether the Arizona Supreme Court applied a nexus test as a
    permissible weighing mechanism or as an impermissible
    screening mechanism. As we have noted elsewhere, a party
    who bears the burden of proving a fact by a preponderance of
    POYSON V. RYAN                         31
    the evidence cannot carry that burden by relying on an
    inconclusive record. See Young v. Holder, 
    697 F.3d 976
    , 989
    (9th Cir. 2012) (en banc) (explaining that “the burden of
    persuasion . . . determines ‘which party loses if the evidence
    is closely balanced’” (quoting Schaffer ex rel. Schaffer v.
    Weast, 
    546 U.S. 49
    , 56 (2005))). Our opinion merely adheres
    to that principle. Because Poyson bears the burden of proof,
    by a preponderance of the evidence, he cannot prevail on the
    record before us. See Schad, 
    671 F.3d at 724
     (“Absent a clear
    indication in the record that the state court applied the wrong
    standard, we . . . must hold there was no constitutional error
    in the [state] courts’ consideration of the mitigating
    evidence.”). We have not imposed a heightened burden of
    proof.
    Fifth, the dissent argues that this case is “substantially
    indistinguishable” from Styers, where we granted habeas
    relief. Dissent 50. In Styers, the Arizona Supreme Court
    rejected evidence that the defendant suffered from post-
    traumatic stress disorder as a result of combat service in
    Vietnam, stating: “This could also, in an appropriate case,
    constitute mitigation. . . . However, two doctors who
    examined defendant could not connect defendant’s condition
    to his behavior at the time of the conspiracy and the murder.”
    Styers, 
    547 F.3d at 1035
     (quoting State v. Styers, 
    865 P.2d 765
    , 777 (Ariz. 1993)). The state court’s language in Styers
    plainly implied that the evidence could be mitigating only if
    it was causally connected to the crime – i.e., that the evidence
    could not be mitigating absent a causal connection to the
    crime. The record in Styers, therefore, contained a clear
    indication that the state court applied an unconstitutional
    causal nexus test – it was not insolubly ambiguous. See
    Eddings, 
    455 U.S. at 114
     (holding that “the sentencer [may
    not] refuse to consider, as a matter of law, any relevant
    32                     POYSON V. RYAN
    mitigating evidence”); Towery, 673 F.3d at 946 (explaining
    that the Eighth Amendment prohibits “treating the evidence
    as irrelevant or nonmitigating as a matter of law”). The
    record here contains no comparable indication. The court did
    not say that Poyson’s evidence could not be mitigating; it said
    only that the evidence was not mitigating, a conclusion that
    could as easily reflect permissible weighing as impermissible
    screening.
    Finally, the dissent argues that the state court violated the
    Eighth Amendment by discarding Poyson’s evidence “before
    the critical stage of its analysis – the final balancing of
    mitigating and aggravating circumstances that determined his
    sentence.” Dissent 54. The state court, however, had
    discretion to accord Poyson’s evidence no weight. See
    Eddings, 
    455 U.S. at
    114–15; Schad, 
    671 F.3d at 723
    .
    Assuming the state court permissibly accorded the evidence
    no weight, we do not see how the court could have committed
    constitutional error by excluding the evidence from the
    ultimate sentencing determination. Had the state court
    afforded the evidence some weight, but declined to consider
    it in the final sentencing analysis, this would be a different
    case.
    At bottom, the ambiguous record in this case is no
    different from those in Schad and Lopez, two cases in which
    we declined to grant habeas relief. In both of those cases, we
    denied relief notwithstanding Arizona’s troublesome history
    of applying an unconstitutional causal nexus test – and
    notwithstanding the existence of an ambiguous record. Here
    too, in the absence of a clear indication in the record that the
    state court applied an unconstitutional standard, we see no
    alternative but to affirm.
    POYSON V. RYAN                           33
    B. Failure to Consider Substance Abuse
    At sentencing, Poyson presented evidence of a history of
    drug and alcohol abuse, but the state trial court and the state
    supreme court declined to treat the evidence as a nonstatutory
    mitigating factor. The trial court found that Poyson had
    presented only “very vague allegations that he has used
    alcohol . . . or . . . drugs in the past,” and found “very little to
    support the allegation that the defendant has a significant
    alcohol and/or drug abuse” history. The supreme court
    agreed that Poyson’s claims to have “used drugs or alcohol in
    the past” were “little more than ‘vague allegations.’” Poyson,
    
    7 P.3d at 90
    .
    Poyson contends the state courts’ conclusions that he
    provided only “vague allegations” of substance abuse were
    unreasonable determinations of the facts under 
    28 U.S.C. § 2254
    (d)(2) and violated his constitutional rights under
    Lockett, 
    438 U.S. at 605
    , Eddings, 
    455 U.S. at 112
    , and
    Parker v. Dugger, 
    498 U.S. 308
    , 321 (1991). We disagree.
    Poyson’s claim – that “[b]ecause his death sentence is
    based upon [an] unreasonable determination of facts, [he] is
    entitled to habeas relief” – misunderstands the law. Even
    assuming that the state courts’ determination that Poyson
    provided only “vague allegations” of substance abuse was an
    unreasonable determination of the facts under § 2254(d)(2),
    an issue we need not reach, Poyson’s claim fails because he
    cannot demonstrate that his constitutional rights were
    violated. See Wilson v. Corcoran, 
    131 S. Ct. 13
    , 17 (2010)
    (per curiam) (holding that while § 2254(d)(2) relieves a
    federal court of AEDPA deference when the state court
    makes an unreasonable determination of facts, it “does not
    repeal the command of § 2254(a) that habeas relief may be
    34                    POYSON V. RYAN
    afforded to a state prisoner ‘only on the ground’ that his
    custody violates federal law”); see also Frantz v. Hazey,
    
    533 F.3d 724
    , 737 (9th Cir. 2008) (en banc) (holding that
    AEDPA does not “require any particular methodology for
    ordering the § 2254(d) and § 2254(a) determination[s]”). An
    unreasonable determination of the facts would not, standing
    alone, amount to a constitutional violation under Lockett,
    Eddings or Parker.
    Lockett invalidated an Ohio death penalty statute that
    precluded the sentencer from considering aspects of the
    defendant’s character or record as a mitigating factor. See
    
    438 U.S. at 604
    . Eddings held that a sentencer may not
    refuse to consider, as a matter of law, any relevant mitigating
    evidence. See 
    455 U.S. at
    113–15. Here, the state courts
    considered Poyson’s evidence of substance abuse, but found
    it wanting as a matter of fact and that Poyson failed to prove
    a history of substance abuse. Thus, there was no
    constitutional violation under Lockett and Eddings.
    Nor has Poyson shown a constitutional violation under
    Parker.      There, the state supreme court reweighed
    aggravating and mitigating circumstances before affirming a
    death sentence. See Parker, 
    498 U.S. at
    321–22. The court’s
    reweighing, however, was premised on its erroneous
    assumption that the state trial court had found that there were
    no mitigating circumstances. See 
    id.
     The Supreme Court
    held that the state supreme court’s action deprived the
    defendant of “meaningful appellate review,” and thus that the
    sentencing violated the defendant’s right against “the
    arbitrary or irrational imposition of the death penalty.” 
    Id. at 321
    . In Poyson’s view, Parker stands for the broad
    proposition that, “[w]hen a state court’s imposition of the
    death penalty is based not on the characteristics of the
    POYSON V. RYAN                         35
    accused and the offense but instead on a misperception of the
    record, the defendant is not being afforded the consideration
    that the Constitution requires.” In Parker, however, the state
    supreme court had misconstrued the state trial court’s
    findings, something that did not occur here. Parker does not
    hold that a state court’s erroneous factual finding in assessing
    mitigation evidence necessarily amounts to a constitutional
    violation. Rather, it suggests the opposite:
    This is not simply an error in assessing the
    mitigating evidence.       Had the Florida
    Supreme Court conducted its own
    examination of the trial and sentencing
    hearing records and concluded that there were
    no mitigating circumstances, a different
    question would be presented. Similarly, if the
    trial judge had found no mitigating
    circumstances and the Florida Supreme Court
    had relied on that finding, our review would
    be very different.
    
    Id. at 322
    .
    In sum, we hold that Poyson is not entitled to habeas
    relief because he has not shown a constitutional violation
    under Lockett, Eddings or Parker. Because Poyson has raised
    arguments under only Lockett, Eddings and Parker, we need
    not decide whether, or under what circumstances, a state
    court’s erroneous factfinding in assessing mitigating evidence
    can itself rise to the level of a constitutional violation.
    36                     POYSON V. RYAN
    C. Penalty Phase Ineffective Assistance of Counsel
    In his federal habeas petition, Poyson argued that he
    received ineffective assistance of counsel during the penalty
    phase of his trial because his trial counsel failed to investigate
    the possibility that he suffered from fetal alcohol spectrum
    disorder (FASD). The district court ruled that Poyson failed
    to present this claim to the state courts, and hence that the
    claim was procedurally defaulted. Poyson challenges that
    ruling on appeal. We review de novo. See Robinson,
    
    595 F.3d at 1099
    .
    A state prisoner must normally exhaust available state
    judicial remedies before a federal court will entertain his
    petition for habeas corpus. See Picard v. Connor, 
    404 U.S. 270
    , 275 (1971); Weaver v. Thompson, 
    197 F.3d 359
    , 363–64
    (9th Cir. 1999); 
    28 U.S.C. § 2254
    (b)(1)(A). This rule
    “reflects a policy of federal-state comity, an accommodation
    of our federal system designed to give the State an initial
    opportunity to pass upon and correct alleged violations of its
    prisoners’ federal rights.” Picard, 
    404 U.S. at 275
     (citations
    and internal quotation marks omitted). “A petitioner can
    satisfy the exhaustion requirement by providing the highest
    state court with a fair opportunity to consider each issue
    before presenting it to the federal court.” Weaver, 
    197 F.3d at 364
    .
    “[A] petitioner may provide further facts to support a
    claim in federal district court, so long as those facts do not
    ‘fundamentally alter the legal claim already considered by the
    state courts.’” Lopez v. Schriro, 
    491 F.3d 1029
    , 1040 (9th
    Cir. 2007) (quoting Vasquez v. Hillery, 
    474 U.S. 254
    , 260
    POYSON V. RYAN                              37
    (1986)).8 “[T]his rule allows a petitioner who presented a
    particular [ineffective assistance of counsel] claim, for
    example that counsel was ineffective in presenting
    humanizing testimony at sentencing, to develop additional
    facts supporting that particular claim.” Moormann v. Schriro,
    
    426 F.3d 1044
    , 1056 (9th Cir. 2005) (citing Weaver, 
    197 F.3d at 364
    ). “This does not mean, however, that a petitioner who
    presented any ineffective assistance of counsel claim below
    can later add unrelated alleged instances of counsel’s
    ineffectiveness to his claim.” 
    Id.
     (citing Carriger v. Lewis,
    
    971 F.2d 329
    , 333 (9th Cir. 1992) (en banc)).
    1. State Proceedings
    In his state habeas petition, Poyson raised two ineffective
    assistance of counsel claims relevant here. In the first claim,
    Poyson alleged that trial counsel “was ineffective because he
    failed to request the appointment of experts in the field of
    mental health early in the case.” He alleged that the
    investigation for both phases of the trial should have begun
    “immediately” upon counsel’s appointment, including “the
    immediate appointment of experts for both parts of the trial.”
    Counsel’s failure “to immediately secure the appointment of
    mental health experts . . . prejudiced” him in two ways. First,
    it precluded him from presenting a defense of “diminished
    capacity” with respect to the Delahunt murder during the guilt
    phase of the trial. Second, “the failure of counsel to
    immediately pursue mitigation caused the loss of mitigating
    information” that could have been presented at sentencing.
    8
    As the Supreme Court has recently clarified, these factual allegations
    must be based on the “record that was before the state court that
    adjudicated the claim on the merits.” Cullen v. Pinholster, 
    131 S. Ct. 1388
    , 1398 (2011).
    38                    POYSON V. RYAN
    Poyson presented a report by a neuropsychologist retained
    during the state habeas proceedings, Robert Briggs, Ph.D.
    According to Poyson, Briggs’ report showed that Poyson
    “was brain-damaged” at the time of the murders, but had
    since “recovered, due to his long stay first in jail, then on
    condemned row, without chemical or physical insult to his
    brain.” In Poyson’s view, “the report leaves no doubt that
    neurophyschological testing shows that he was impaired at
    the time of the crime.” This mitigating evidence had been
    “lost forever.”
    In the state petition’s second claim, Poyson alleged that
    trial counsel failed to properly present mitigation and
    psychological evidence because counsel “did nothing to show
    the trial court how [his] abusive childhood caused, or directly
    related to, [his] conduct during the murders.” He alleged that
    trial counsel were deficient because they were “required to
    make some attempt to correlate Mr. Poyson’s physically and
    psychologically abusive background with his behavior,”
    because “a connection between the two would be much more
    powerful in mitigation than the abuse standing alone.”
    2. Federal Petition
    Poyson’s federal petition presented a substantially
    different claim – counsel’s failure to investigate Poyson’s
    possible fetal alcohol spectrum disorder. Poyson alleged that
    trial counsel were ineffective because they “failed to make
    any effort to investigate and develop” evidence that Poyson
    suffered from FASD. He alleged that defense counsel “failed
    to investigate the obvious possibility that [he] suffered from
    FASD,” made “no effort” to “pursue this fertile area of
    mitigation” and “ignored obvious evidence that [he] was
    exposed to drugs and alcohol in utero.” Poyson further
    POYSON V. RYAN                       39
    alleged that he was prejudiced by counsel’s deficient
    performance:
    Their failure to adequately investigate and
    substantiate [evidence that Petitioner was
    exposed to drugs and alcohol in utero]
    profoundly prejudiced Petitioner. Adequate
    explanation during the pre-sentence hearing of
    the effect of FASD on Petitioner’s brain
    would likely have convinced the trial court
    that Petitioner had a lesser degree of
    culpability.
    3. Analysis
    The district court concluded that the claim raised in the
    federal petition had not been fairly presented to the Arizona
    courts:
    This Court concludes that the claim asserted
    in the instant amended petition is
    fundamentally different than that presented in
    state court. Petitioner’s argument in support
    of [this claim] is based entirely on trial
    counsel’s alleged failure to investigate and
    develop mitigation evidence based on
    Petitioner’s in utero exposure to drugs and
    alcohol.     This version of Petitioner’s
    sentencing [ineffective assistance of counsel]
    claim has never been presented to the Arizona
    courts. While it is true that new factual
    allegations do not ordinarily render a claim
    unexhausted, a petitioner may not
    “fundamentally alter the legal claim already
    40                   POYSON V. RYAN
    considered by the state courts.” Beaty v.
    Stewart, 
    303 F.3d 975
    , 989–90 ([9th Cir.]
    2002) (citing Vasquez, 
    474 U.S. at 260
    ). To
    do so deprives the state court of “a meaningful
    opportunity to consider allegations of legal
    error without interference from the federal
    judiciary.” Vasquez, 
    474 U.S. at 257
    . Here,
    Petitioner is not simply proffering additional
    evidentiary support for a factual theory
    presented to the state court. Rather, he is
    alleging an entirely new theory of counsel
    ineffectiveness; one that has not previously
    been presented in state court.
    We agree. Poyson presented not only new facts in
    support of a claim presented to the state court, but also a
    fundamentally new theory of counsel’s ineffectiveness – one
    that the Arizona courts lacked “a meaningful opportunity to
    consider.” Vasquez, 
    474 U.S. at 257
    . The district court
    therefore properly dismissed Poyson’s penalty phase
    ineffective assistance of counsel claim as procedurally
    defaulted.
    AFFIRMED.
    POYSON V. RYAN                        41
    THOMAS, Circuit Judge, concurring in part and dissenting
    in part:
    The Arizona Supreme Court unconstitutionally excluded
    mitigating evidence from its consideration because the
    evidence was not causally related to the crimes. As a result,
    Poyson was deprived of his right to an individualized capital
    sentencing determination under the Eighth and Fourteenth
    Amendments. Penry v. Lynaugh (Penry I), 
    492 U.S. 302
    , 317
    (1989), abrogated on other grounds by Atkins v. Virginia,
    
    536 U.S. 304
     (2002); Eddings v. Oklahoma, 
    455 U.S. 104
    ,
    110–12 (1982); Lockett v. Ohio, 
    438 U.S. 586
    , 604–05
    (1978). Because the majority’s contrary conclusion cannot be
    reconciled with controlling Supreme Court precedent, I
    respectfully dissent.
    I
    “[I]n capital cases the fundamental respect for humanity
    underlying the Eighth Amendment . . . requires consideration
    of the character and record of the individual offender and the
    circumstances of the particular offense as a constitutionally
    indispensable part of the process of inflicting the penalty of
    death.” Lockett, 
    438 U.S. at 604
     (alteration in original)
    (quoting Woodson v. North Carolina, 
    428 U.S. 280
    , 304
    (1976)). Accordingly, the Supreme Court has held since
    1978 that a defendant facing a capital sentence must have the
    opportunity to present all relevant evidence in mitigation.
    See 
    id.
     at 604–05. Merely admitting the evidence at the
    penalty phase does not satisfy the constitutional mandate.
    Rather, to ensure that a sentence of death reflects “a reasoned
    moral response to a defendant’s background, character, and
    crime,” Penry I, 
    492 U.S. at 328
     (emphasis in original)
    (quoting Franklin v. Lynaugh, 
    487 U.S. 164
    , 184 (1988)
    42                    POYSON V. RYAN
    (O’Connor, J., concurring in the judgment)), the procedure
    for evaluating mitigating evidence must ensure that the
    sentencer is “able to consider and give effect to that evidence
    in imposing sentence,” id. at 319 (emphasis added) (citing
    Hitchcock v. Dugger, 
    481 U.S. 393
     (1987)); see also Eddings,
    
    455 U.S. at
    113–14. A sentencer “give[s] effect to”
    mitigating evidence by weighing all such admissible evidence
    against any aggravating circumstances proven by the state.
    See, e.g., Eddings, 
    455 U.S. at
    114–15; Towery v. Ryan,
    
    673 F.3d 933
    , 944–45 (9th Cir. 2012). Only by viewing all
    sentencing evidence in context can a court render the
    individualized determination of moral culpability that the
    Constitution requires. See Lambright v. Schriro, 
    490 F.3d 1103
    , 1115 (9th Cir. 2007) (per curiam).
    A court violates the constitutional command by
    categorically screening out certain mitigating evidence as a
    matter of law, before it may be weighed in combination with
    all other relevant sentencing evidence. Tennard v. Dretke,
    
    542 U.S. 274
    , 284–86 (2004); Eddings, 
    455 U.S. at
    113–14
    (holding that the sentencer may not “refuse to consider, as a
    matter of law, any relevant mitigating evidence”) (emphasis
    in original). Relevance is the only prerequisite to full
    consideration of mitigating evidence. See Tennard, 
    542 U.S. at
    284–85. While the state court may assign a relative weight
    to each item of admissible mitigating evidence, Towery,
    673 F.3d at 944, it cannot impose any additional criteria, such
    as a causal nexus requirement, to screen such evidence from
    the sentencer’s ultimate view of the defendant. A sentencing
    procedure that automatically assigns a “weight” of zero to
    any mitigating evidence lacking a causal nexus to the crime
    is indistinguishable from an analytical “screen” that excludes
    such evidence from consideration as a matter of law. Thus,
    regardless of what label it bears, such a “weighing” procedure
    POYSON V. RYAN                        43
    plainly violates Eddings. Simply altering the label attached
    to an unconstitutional process does not magically render it
    constitutional.
    At the time it decided this case, the Arizona Supreme
    Court applied a causal nexus test similar to the one the U.S.
    Supreme Court held unconstitutional in Tennard. See, e.g.,
    State v. Sansing, 
    77 P.3d 30
    , 37 (Ariz. 2003) (“Mere evidence
    of drug ingestion or intoxication, however, is insufficient to
    establish statutory mitigation. The defendant must also prove
    a causal nexus between his drug use and the offense.”)
    (footnote omitted); State v. Cañez, 
    42 P.3d 564
    , 594 (Ariz.
    2002) (en banc) (citation omitted) (“[A] causal nexus between
    the intoxication and the offense is required to establish
    non-statutory impairment mitigation”); State v. Kayer,
    
    984 P.2d 31
    , 45 (Ariz. 1999) (en banc) (“A defendant must
    show a causal link between the alcohol abuse, substance
    abuse, or mental illness and the crime itself” for such
    evidence to be considered a mitigating factor); State v.
    Clabourne, 
    983 P.2d 748
    , 756 (Ariz. 1999) (en banc)
    (defendant’s difficult childhood not a mitigating factor
    because “he has failed to link his family background to his
    murderous conduct or to otherwise show how it affected his
    behavior”); State v. Djerf, 
    959 P.2d 1274
    , 1289 (Ariz. 1998)
    (en banc) (defendant’s experience of childhood abuse cannot
    be considered as a mitigating factor unless there is a causal
    connection between the abuse and the crime); State v. Jones,
    
    937 P.2d 310
    , 322 (Ariz. 1997) (defendant did not establish
    impaired capacity as either a statutory or non-statutory
    mitigating factor because “no testimony establishes, either
    because of his use of drugs or because he was coming down
    off of the drugs, that defendant could not appreciate the
    wrongfulness of his conduct or conform his conduct to the
    law”); State v. Wallace, 
    773 P.2d 983
    , 986 (Ariz. 1989) (en
    44                    POYSON V. RYAN
    banc) (“A difficult family background, in and of itself, is not
    a mitigating circumstance.”).
    Arizona’s causal nexus test not only violated Eddings, but
    a long line of Supreme Court cases holding that all relevant
    mitigating evidence must be considered in capital sentencing.
    These cases establish that evidence of a defendant’s
    background and character, including childhood trauma or
    mental health problems, is relevant in mitigation even if it
    does nothing to explain why the defendant committed the
    crime of conviction. See Penry I, 
    492 U.S. at
    322–23;
    Lockett, 
    438 U.S. at 604
    . See also Lambright, 
    490 F.3d at 1115
    .     Such evidence may reasonably diminish the
    defendant’s moral culpability, see Penry I, 
    492 U.S. at
    322–23, and “might cause a sentencer to determine that a life
    sentence, rather than death at the hands of the state, is the
    appropriate punishment for the particular defendant,”
    Lambright, 
    490 F.3d at 1115
    . Placing such evidence beyond
    the sentencer’s effective reach is “simply unacceptable in any
    capital proceeding,” 
    id.
     (citing Lockett, 
    438 U.S. at 605
    ),
    because it deprives the sentencer of the complete,
    multifaceted rendering of the defendant that must be the basis
    for capital sentencing.
    Arizona’s unconstitutional causal nexus test remained in
    force until Tennard, and it was in use when the Arizona
    Supreme Court considered Poyson’s appeal.
    II
    In reviewing pre-Tennard Arizona capital cases, we do
    not presume that the Arizona Supreme Court
    unconstitutionally refused to consider relevant mitigating
    evidence in its re-weighing of aggravating and mitigating
    POYSON V. RYAN                               45
    factors.1 Rather, we examine the record to determine whether
    the Arizona Supreme Court applied an unconstitutional causal
    nexus test to screen mitigating evidence from consideration
    in a particular case. In Schad v. Ryan, we affirmed the denial
    of habeas relief when the record contained “no indication that
    the state courts applied a nexus test, either as a method of
    assessing the weight of the mitigating evidence, or as an
    unconstitutional screening mechanism . . . .” 
    671 F.3d 708
    ,
    724 (9th Cir. 2009) (per curiam). In doing so, Schad was
    consistent with the Supreme Court’s instruction that
    “[f]ederal courts are not free to presume that a state court did
    not comply with constitutional dictates on the basis of
    nothing more than a lack of citation.” Bell v. Cone, 
    543 U.S. 447
    , 455 (2005) (per curiam) (citations omitted).
    Similarly, in Towery, we rejected the defendant’s claim
    that the Arizona Supreme Court unconstitutionally screened
    mitigating evidence that lacked a causal nexus to the crime.
    673 F.3d at 944. We stressed that the state supreme court had
    articulated the proper standard for considering mitigating
    evidence. See id. In independently reviewing Towery’s
    mitigating evidence, the state court recognized that, “[h]aving
    considered family background during the penalty phase, the
    sentencer must give the evidence such weight that the
    sentence reflects a ‘reasoned moral response’ to the
    1
    Contrary to the majority’s suggestion, Poyson does not ask us to
    presume that, because the Arizona courts frequently applied an
    unconstitutional causal nexus test at the time of his sentencing, the state
    court did so in his case. Rather, the Arizona courts’ routine—if not
    perfectly consistent—practice of unconstitutional capital sentencing before
    Tennard provides probative evidence that the state court in Poyson’s case
    committed the same error. To consider that evidence, which is plainly
    material to Poyson’s claim, is not to apply an impermissible presumption
    that the state court erred here.
    46                    POYSON V. RYAN
    evidence.” Id. (alteration in original) (quoting State v.
    Towery (Towery I), 
    920 P.2d 290
    , 311 (Ariz. 1996)). In light
    of the whole record, this statement demonstrated the Arizona
    Supreme Court’s awareness that it must weigh all relevant
    mitigating evidence against the aggravating circumstances,
    even if it ultimately assigned relatively little weight to that
    mitigating evidence which lacked a strong causal link to the
    crime. See 
    id.
     at 944–45.
    In contrast, in Styers v. Schriro, 
    547 F.3d 1026
     (9th Cir.
    2008), we looked beyond the Arizona Supreme Court’s
    characterization of its own reasoning where the form of its
    analysis evidenced unconstitutional screening. See 
    id. at 1035
     (“In conducting its independent review of the propriety
    of Styers’ death sentence, the Arizona Supreme Court stated
    that it had ‘considered all of the proffered mitigation’. . .
    However, its analysis prior to this statement indicates
    otherwise.”) (internal citation omitted). Though the state
    court claimed that it “considered” all mitigating evidence, its
    analysis showed that it impermissibly screened Styers’
    mitigating mental health evidence solely because it lacked a
    causal nexus to the crime. Declining to elevate form over
    substance, we granted the writ upon concluding that “the
    Arizona Supreme court appears to have imposed a test
    directly contrary to the constitutional requirement that all
    relevant mitigating evidence be considered by the sentencing
    body.” 
    Id.
     (emphasis added) (citing Smith v. Texas, 
    543 U.S. 37
    , 45 (2004)).
    Recently, in Lopez v. Ryan, 
    630 F.3d 1198
     (9th Cir.
    2011), we declined to presume from Arizona case law alone
    that “a tacit causation rule underpinned the state court’s
    decision” in the case at hand. 
    Id. at 1203
    . Rather than
    “infer[ring] unconstitutional reasoning from judicial silence,”
    POYSON V. RYAN                        47
    Lopez instructs that we should “look to what the record
    actually says.” 
    Id.
     at 1204 (citing Schad, 606 F.3d at
    1046–47).
    The import of all these cases is that we should not
    presume any constitutional error from a silent record, nor
    should we accept without further examination a state court’s
    characterizations of its own reasoning. Rather, we should
    look to the substance of the record itself to determine whether
    the state court unconstitutionally excluded relevant mitigating
    evidence from consideration at sentencing.
    Though it insists otherwise, the majority treats the
    statement in Schad that relief should be denied “[a]bsent a
    clear indication in the record that the state court applied the
    wrong standard” to create a new, more stringent test for
    determining whether a state court applied an unconstitutional
    causal nexus analysis. 
    671 F.3d at 724
    . The majority then
    applies this “test” to resolve purported ambiguities in the
    record in the state’s favor.
    However, in stating that we should identify “a clear
    indication in the record” that the state court violated Tennard
    before granting habeas relief, the Schad panel was merely
    explaining Bell’s rule against presuming error from a silent
    record. No Supreme Court case imposes a “clear indication”
    test, nor does any case impose a rule that we must resolve
    ambiguities against the petitioner. To the contrary, as Justice
    O’Connor wrote in her Eddings concurrence, the qualitatively
    different nature of a death sentence requires reviewing courts
    “to remove any legitimate basis for finding ambiguity
    concerning the factors actually considered by the trial court.”
    
    455 U.S. at 119
     (O’Connor, J., concurring). In short, if there
    is any legitimate reason to believe that a court has excluded
    48                         POYSON V. RYAN
    mitigating evidence from consideration, we should grant
    habeas relief so that a proper weighing of aggravating and
    mitigating factors can occur. The appropriate approach, taken
    in our more recent cases, is simply to evaluate “what the
    record actually says.” Lopez, 
    630 F.3d at
    1204 (citing Schad,
    606 F.3d at 1046–47).2
    Moreover, because the Schad panel found “no indication
    that the state courts applied a nexus test, either as a method of
    assessing the weight of the mitigating evidence, or as an
    unconstitutional screening mechanism . . . ,” 
    671 F.3d at 724
    (emphasis added), the case simply does not address what a
    “clear indication” of unconstitutional causal nexus screening
    looks like, nor the relationship between the purported “clear
    indication” requirement and the statutory standards governing
    habeas review. Thus, even assuming that a “clear indication”
    of unconstitutional causal nexus screening is in fact an
    2
    Woodford v. Visciotti, 
    537 U.S. 19
     (2002) (per curiam), is not to the
    contrary. There, the Supreme Court simply rejected our reading of the
    state court’s opinion; it did not instruct us to deny habeas relief whenever
    the state court fails to provide a “clear indication” of constitutional error.
    See 
    id. at 24
    . While acknowledging that certain language in the state
    court’s opinion could be read as misstating the Strickland standard, the
    Woodford Court faulted us for rejecting other, stronger evidence in the
    opinion indicating that the state court applied the correct standard. See 
    id.
    If anything, Woodford supports a close reading of state court decisions on
    habeas review to determine whether they contravene or unreasonably
    apply federal law. See 
    id.
     at 23–24. As Woodford itself demonstrates, this
    approach does not offend “the presumption that state courts know and
    follow the law.” 
    Id. at 24
     (citations omitted). Moreover, to the extent the
    majority finds the Arizona Supreme Court’s opinion in this case
    ambiguous on the causal nexus issue, Woodford is of little help, as it
    simply does not address the analysis of an ambiguous state court decision
    on habeas review. See 
    id. at 23
     (asserting that the state court opinion at
    issue “painstakingly describes the [correct] Strickland standard”).
    POYSON V. RYAN                                49
    independent prerequisite to granting habeas relief, Schad
    entirely fails to support the majority’s proposition that a
    “clear indication” can exist only in the absence of any
    ambiguity in the state court’s analysis. The notion that a
    habeas petitioner can secure relief only by conclusively
    establishing the absence of any ambiguity in the state court
    record is patently inconsistent with the preponderance
    standard that defines the petitioner’s burden.3 Assuming that
    we and the district court faithfully apply the statutory
    standard for granting a certificate of appealability, we should
    3
    The majority insists that, under its reasoning, Poyson need not prove
    the absence of any meaningful ambiguity in the state court record to
    secure relief. Rather, the majority asserts that Poyson’s claim must fail
    because the record in this case “is insolubly ambiguous.” Maj. Op. 30.
    Thus, we now have new categories of ambiguity: ambiguous,
    meaningfully ambiguous, and insoluably ambiguous. Not only are these
    labels distinctions without difference, these new tests are not to be found
    in any Supreme Court jurisprudence, which governs our considerations of
    AEDPA cases, nor our own. The majority does not cite a single case in
    which we have rejected a prisoner’s habeas claim because we simply
    could not figure out what the state court had said. Instead, it relies on
    decisions denying relief because the record—ambiguous as it might have
    been—ultimately showed that the state court employed a causal nexus test
    as a permissible weighing mechanism or did not rely on causal nexus
    analysis at all. Maj. Op. 26–27 (citing Towery, 673 F.3d at 945; Schad,
    
    671 F.3d at 724
    ; Lopez, 
    630 F.3d at
    1203–04). To the extent the majority
    suggests that the state court decision at issue in this case is unprecedented
    in the extent of its ambiguity, that proposition is belied by the state court
    decision in Styers, which, as explained below, employed strikingly similar
    language yet was sufficiently comprehensible to support habeas relief. Of
    course, Poyson bears the burden of proof, but there is no authority for the
    proposition that we may throw up our hands and declare the record too
    ambiguous to definitively interpret one way or the other. The majority
    fails to recognize that the preponderance standard, by definition, permits
    the party bearing the burden to proof to prevail without establishing his
    position beyond reasonable doubt. The effect of the majority rule is to
    alter the burden of proof, and it flatly contracts our analysis in Styers.
    50                          POYSON V. RYAN
    only have the opportunity to review claims as to which the
    record is somewhat ambiguous. See Shackleford v. Hubbard,
    
    234 F.3d 1072
    , 1081 (9th Cir. 2000) (quoting Slack v.
    McDaniel, 
    529 U.S. 473
    , 484 (2000)) (to obtain a certificate
    of appealability, a habeas petitioner must demonstrate “‘that
    reasonable jurists could debate whether . . . the petition
    should have been resolved in a different manner . . . .’”). To
    secure relief, the petitioner need not show that there is no
    conceivable ambiguity in the record that could support the
    state’s position; rather, he must persuade us that his evidence
    that the state court’s decision was contrary to clearly
    established federal law is stronger than the state’s.
    III
    I disagree with the majority’s conclusion that the state
    court’s decision is simply too ambiguous to permit
    meaningful habeas review. Rather, when we examine “what
    the record actually says,” Lopez, 
    630 F.3d at 1204
     (citation
    omitted), the Arizona Supreme Court’s use of an
    unconstitutional causal nexus test to screen Poyson’s
    mitigating evidence of mental health problems and childhood
    abuse is readily apparent.4
    The Arizona Supreme Court’s analysis in this case is
    substantially indistinguishable from its decision in Styers, in
    which we found sufficient evidence of a constitutional
    violation to grant habeas relief. In Styers, the Arizona
    Supreme Court listed each item of proffered mitigation
    4
    I agree with the majority that the Arizona Supreme Court did not
    violate Eddings in rejecting Poyson’s evidence of substance abuse as a
    mitigating factor, as it found that he failed to establish a significant history
    of substance abuse as a matter of fact.
    POYSON V. RYAN                          51
    evidence: First, it noted that “Defendant had no prior
    convictions for either misdemeanors or felony offense[s]” and
    stated that “[t]his is relevant mitigating evidence.” State v.
    Styers, 
    865 P.2d at 777
     (citation omitted). Next, it stated that
    “Defendant’s service in Vietnam and honorable discharge are
    also relevant mitigating circumstances.” 
    Id.
     (citation
    omitted). Then, the court noted that “Defendant also suffered
    from post-traumatic stress disorder prior to and around the
    time of the murder as a result of his combat service in
    Vietnam.” 
    Id.
     The court said that “[t]his could also, in an
    appropriate circumstance, constitute mitigation. However,
    two doctors who examined defendant could not connect
    defendant’s condition to his behavior at the time of the
    conspiracy and murder.” 
    Id.
     (internal citation omitted). The
    state court did not recite a comprehensive list of the
    mitigating factors it considered in its independent review of
    Styers’ death sentence; thus, it did not clarify whether Styers’
    post-traumatic stress disorder would in fact “constitute
    mitigation.” Instead, the court asserted that “[w]e have
    considered all of the proffered mitigation and, like the trial
    court, find it is not sufficiently substantial to warrant
    leniency.” 
    Id. at 777
    .
    On habeas review, we relied on this analysis to find that
    the state court violated Styers’ right to an individualized
    capital sentencing under Eddings and Smith, notwithstanding
    its claim to have considered all of Styers’ proffered
    mitigating evidence. Styers, 
    547 F.3d at 1035
    . Though the
    state court acknowledged that evidence of post-traumatic
    stress disorder is, as a general matter, relevant in mitigation,
    we found that its “use of the conjunctive adverb ‘however,’
    following its acknowledgment that such evidence ‘could’ in
    certain cases constitute mitigation, indicates that this was not
    such a case.” 
    Id.
     In the context of its entire analysis, this turn
    52                       POYSON V. RYAN
    of phrase revealed that the state court had applied a causal
    nexus test “directly contrary to the constitutional requirement
    that all relevant mitigating evidence be considered by the
    sentencing body.” 
    Id.
     We reaffirmed this interpretation in
    Schad, describing Styers as a case in which the state court
    “expressly disregarded” mitigating psychiatric evidence due
    to the defendant’s “failure to demonstrate a causal connection
    between the disorder and the crime.” Schad, 
    671 F.3d 708
    ,
    724 (9th Cir. 2009) (emphasis added).
    Upon close examination, the state court’s analysis in
    Poyson’s case is strikingly similar to that in Styers. With
    respect to Poyson’s mental health evidence, the Arizona
    Supreme Court acknowledged that Poyson “suffers from
    ‘certain personality disorders’” and did not question that
    evidence of such disorders is relevant in mitigation. State v.
    Poyson, 
    7 P.3d at 90
    . It then stated, echoing its reasoning in
    Styers: “[h]owever, we find no indication in the record that
    ‘the disorder controlled [his] conduct or impaired his mental
    capacity to such a degree that leniency is required.’” 
    Id.
     at
    90–91 (quoting State v. Brewer, 
    826 P.2d 783
    , 802 (Ariz.
    1992)). It therefore accorded Poyson’s evidence of mental
    health problems “no mitigating weight.” Id. at 91. Similarly,
    the state court acknowledged that Poyson was physically,
    mentally, and sexually abused as a child. Id. It then stated:
    “however, defendant did not show that his traumatic
    childhood somehow rendered him unable to control his
    conduct. Thus, the evidence is without mitigating value.”
    Id.5
    5
    Though we review the Arizona Supreme Court’s opinion in this case,
    the sentencing court’s analysis is relevant to the extent that the state
    supreme court generally adopted its reasoning. Without a doubt, the
    sentencing court’s discussion of Poyson’s proffered mitigating evidence
    POYSON V. RYAN                               53
    If anything, the state court provided more evidence of
    unconstitutional causal nexus screening in Poyson’s case than
    it did in Styers’. For at the end of its opinion, the state court
    listed all of the mitigating circumstances it considered in its
    independent review of Poyson’s death sentence. Id. It
    omitted from this critical tally both Poyson’s personality
    disorders and his abusive childhood. See id. (listing only
    “cooperation with law enforcement, age, potential for
    rehabilitation, and family support” as mitigating evidence in
    the case); see also Maj. Op. 21–22 (acknowledging that the
    state court found—and weighed—only one statutory
    mitigating factor (age) and three nonstatutory mitigating
    factors (cooperation with law enforcement, potential for
    rehabilitation, and family support)).
    Bell forbids our presuming constitutional error based on
    a silent record. However, like the panel that granted the writ
    in Styers, we are not bound to accept a state court’s
    characterization of its own analysis when its reasoning
    reveals a deprivation of constitutional rights in violation of
    clearly established law. This is particularly true when the
    lends greater force to his Penry claim. For example, the sentencing court
    accepted that Poyson suffers from personality disorders, yet the sentencing
    judge concluded that this evidence did not “rise to the level of being a
    mitigating factor because I am unable to draw any connection whatsoever
    with such personality disorders and the commission of these offenses.”
    (emphasis added). To the extent that the court excluded the evidence on
    the ground that Poyson’s mental health problems were not sufficiently
    severe, it erred. Evidence of mental health problems is relevant in
    mitigation, and a defendant need not show that such problems rise to a
    specified level of severity to establish their relevance. See Tennard,
    
    542 U.S. at
    284–85. The sentencing court improperly rejected Poyson’s
    personality disorders as mitigating evidence because of the lack of causal
    connection between those disorders and the murders at issue.
    54                      POYSON V. RYAN
    result of the state court’s error is to deprive a human being of
    his life.
    The Eighth and Fourteenth Amendments prohibit state
    courts from screening mitigating evidence from full
    consideration based on a lack of causal nexus to the crime of
    conviction. In reviewing Poyson’s sentence, however, the
    Arizona Supreme Court applied a formula that automatically
    assigned a “weight” or “value” of zero to all mitigating
    evidence that lacked a causal nexus to the crime. Most
    significantly, this total devaluation of Poyson’s mitigating
    evidence occurred logically prior to the state court’s
    balancing of aggravating and mitigating circumstances. See
    State v. Poyson, 
    7 P.3d at
    90–91. As such, the Arizona
    Supreme Court failed to “consider all relevant mitigating
    evidence and weigh it against the evidence of the aggravating
    circumstances,” Eddings, 
    455 U.S. at 117
     (emphasis added),
    which prevented Poyson from presenting the totality of his
    individualized circumstances to the court exercising authority
    to condemn him to death. The “consideration” of Poyson’s
    mitigating evidence was without meaning where the court
    discarded that evidence before the critical stage of its
    analysis—the final balancing of mitigating and aggravating
    circumstances that determined his sentence. To label the
    process “weighing” does not make it so; screening by any
    other name is still screening.
    The Arizona Supreme Court did not consider mitigating
    evidence offered by Poyson because it lacked a causal nexus
    to the crime. In doing so, it committed Eddings error.
    Remand is required.
    I respectfully dissent, in part.