Eric Mann v. Charles Ryan , 828 F.3d 1143 ( 2016 )


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  •                 FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    ERIC OWEN MANN,                           No. 09-99017
    Petitioner-Appellant,
    D.C. No.
    v.                    4:03-CV-00213-CKJ
    CHARLES L. RYAN,
    Respondent-Appellee.              OPINION
    Appeal from the United States District Court
    for the District of Arizona
    Cindy K. Jorgenson, District Judge, Presiding
    Argued and Submitted En Banc January 11, 2016
    Pasadena, California
    Filed July 15, 2016
    Before: Sidney R. Thomas, Chief Judge, and Susan P.
    Graber, M. Margaret McKeown, Kim McLane Wardlaw,
    Marsha S. Berzon, Richard R. Clifton, Consuelo M.
    Callahan, N. Randy Smith, Morgan Christen, Paul J.
    Watford, and John B. Owens, Circuit Judges.
    Opinion by Judge Clifton;
    Partial Concurrence and Partial Dissent by Chief Judge
    Thomas;
    Partial Concurrence and Partial Dissent by Judge Christen
    2                         MANN V. RYAN
    SUMMARY*
    Habeas Corpus / Death Penalty
    The en banc court affirmed the district court’s judgment
    denying Arizona state prisoner Eric Owen Mann’s 
    28 U.S.C. § 2254
     habeas corpus petition challenging his conviction and
    capital sentence for two counts of first-degree murder.
    The en banc court held that Mann is not entitled to relief
    on his claims of guilt-phase ineffective assistance of counsel.
    Regarding his claim of ineffective assistance of counsel
    at sentencing, Mann argued that the state post-conviction
    court applied an improper “more-likely-than-not” prejudice
    standard. The en banc court concluded that the state post-
    conviction court’s invocation of the Strickland prejudice
    standard might have been ambiguous but was not clearly
    incorrect. As a result, Mann’s petition presented this court
    with the question: When, in the absence of clarity, can this
    court conclude that a state court has applied the wrong
    standard to review a Strickland claim raised in a petition for
    post-conviction relief? The en banc court held that it must
    approach this question with the deference AEDPA requires
    and grant habeas relief only if no fairminded jurist could
    conclude that the adjudication was consistent with clearly
    established Supreme Court precedent. The en banc court held
    that fairminded jurists could conclude that the state court’s
    review of Mann’s claim of ineffective assistance of counsel
    comported with Strickland.
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    MANN V. RYAN                          3
    Regarding Mann’s argument, in reliance on Eddings v.
    Oklahama, that the state court improperly excluded
    mitigating evidence presented during post-conviction
    proceedings on the ground that Mann had not demonstrated
    a causal link between the evidence and the crime, the en banc
    court explained that Eddings cannot provide a back door to de
    novo review where there is no indication that the state post-
    conviction court excluded evidence that would have led to a
    reasonable probability of a different sentence in violation of
    clearly established federal law.
    The en banc court held that it was not contrary to, and did
    not involve an unreasonable application of, federal law for the
    state court to conclude that Mann failed to show that the
    mitigating circumstances he presented before the sentencing
    and post-conviction courts outweighed the aggravating
    circumstances of his crimes.
    Applying AEDPA deference to the state court’s
    conclusion that Mann was not prejudiced by his counsel’s
    alleged failure to present certain mitigation evidence at
    sentencing, the en banc court could not conclude that it was
    unreasonable for the state post-conviction court to find that
    the new evidence as to Mann’s capacity for remorse and the
    effect of a 1985 car accident on Mann’s behavior did not
    undermine confidence in the outcome of sentencing.
    Concurring in part and dissenting in part, Chief Judge
    Thomas agreed with the majority that Mann is not entitled to
    relief on his guilt-phase claims of ineffective assistance of
    counsel, and disagreed that he is not entitled to relief on his
    claim of ineffective assistance of counsel at sentencing.
    4                     MANN V. RYAN
    Concurring in part and dissenting in part, Judge Christen,
    joined by Judge Berzon, agreed with the majority and the
    Chief Judge that petitioner did not meet his burden of
    establishing a meritorious guilt-phase claim, joined the Chief
    Judge’s analysis and conclusion that Mann is entitled to de
    novo review on his sentencing-phase ineffective assistance of
    counsel claim, joined the Chief Judge’s discussion of
    Strickland’s deficient performance prong, but concluded that
    Mann is not entitled to relief because she was not persuaded
    that he met his burden of establishing prejudice.
    COUNSEL
    Cary S. Sandman (argued), Federal Public Defender’s Office,
    Tucson, Arizona; Amy Krauss, Law Office of Amy B.
    Krauss, Tucson, Arizona; for Petitioner-Appellant.
    John Pressley Todd (argued), Assistant Attorney General;
    Kent Cattani, Chief Counsel; Mark Brnovich, Attorney
    General of Arizona; Capital Litigation Section, Office of the
    Attorney General, Phoenix, Arizona; for Respondent-
    Appellee.
    MANN V. RYAN                          5
    OPINION
    CLIFTON, Circuit Judge:
    Petitioner Eric Owen Mann lured Richard Alberts and
    Ramon Bazurto to his house in 1989 with a promise to sell
    them cocaine for about $20,000. Instead, he took the money
    and shot both men to death. Mann was eventually arrested
    and tried in Arizona state court in 1994. A jury found him
    guilty on two counts of first-degree murder, and the trial
    judge sentenced him to death, noting his long criminal history
    and his apparent lack of remorse for the killings. Following
    the affirmance of his convictions and sentence by the Arizona
    Supreme Court, Mann filed a petition for post-conviction
    relief in state court in 2000 asserting, among other claims,
    that he had received ineffective assistance of counsel at trial
    and sentencing. That petition was assigned to the same judge
    who had presided over Mann’s trial and imposed the capital
    sentence upon him a few years before. The judge denied in
    full Mann’s petition for post-conviction relief, and the
    Arizona Supreme Court thereafter denied Mann’s petition for
    review. Mann then filed a petition for habeas corpus under
    
    28 U.S.C. § 2254
     in federal district court. That petition was
    denied, and Mann appeals.
    Of primary importance here is Mann’s argument that the
    state post-conviction court applied the wrong standard to his
    claim of ineffective assistance of counsel at sentencing, in
    violation of Supreme Court precedent in Strickland v.
    Washington, 
    466 U.S. 668
     (1984). Because of this error,
    Mann argues, our review of that claim should not be
    constrained by the Antiterrorism and Effective Death Penalty
    Act of 1996 (AEDPA), which requires federal courts to defer
    to state court decisions on the merits of habeas corpus claims
    6                      MANN V. RYAN
    unless they are contrary to clearly established federal law. 
    28 U.S.C. § 2254
    (d). After careful review of the underlying
    state court decision, we conclude that its invocation of the
    Strickland prejudice standard might have been ambiguous but
    was not clearly incorrect. As a result, Mann’s petition
    presents us with the question: When, in the absence of clarity,
    can we conclude that a state court has applied the wrong
    standard to review a Strickland claim raised in a petition for
    post-conviction relief? The answer is that we must approach
    this question with the deference AEDPA requires and grant
    habeas relief only if no fairminded jurist could conclude that
    the adjudication was consistent with clearly established
    Supreme Court precedent. See Harrington v. Richter, 
    562 U.S. 86
    , 101 (2011).
    Here, fairminded jurists could conclude that the state
    court’s review of Mann’s claim of ineffective assistance of
    counsel comported with Strickland. Applying AEDPA
    deference to Mann’s claims, we conclude that the state post-
    conviction court’s denial of post-conviction relief was not
    contrary to, or an unreasonable application of, federal law.
    We therefore affirm the district court and deny Mann’s
    petition for habeas relief.
    I. Background
    A. The murders
    In the fall of 1989, a few weeks before Thanksgiving,
    Mann arranged to sell Richard Alberts a kilogram of cocaine
    in exchange for about $20,000. Mann never intended to
    provide Alberts with the drugs. Instead, he planned to hand
    Alberts a shoebox full of newspaper and take his money in
    MANN V. RYAN                          7
    exchange. He knew he would have to kill Alberts after this
    transaction took place.
    On the evening of Thanksgiving Day, Alberts arrived at
    Mann’s house to complete the sale, accompanied by another
    man, Ramon Bazurto. Mann’s girlfriend, Karen Miller, was
    also at the house to provide Mann with backup. Miller
    testified that when Mann saw Alberts had brought along
    someone else, he became upset, but after a brief hesitation
    decided he would nevertheless go through with his plan to rip
    Alberts off. The three men and Miller went to Mann’s
    bedroom, where Alberts handed Mann the money and Mann
    gave Alberts the newspaper-filled shoebox. When Alberts
    lifted the top of the box, Mann shot him and then Bazurto.
    Alberts died almost instantly from a shot through the
    heart. Bazurto took longer to die. He fell onto his back and
    lay on the ground, attempting to move his hand towards the
    pistol he was carrying in his waistband. According to
    Miller’s testimony, Mann stood over Bazurto’s prone body
    and described what was happening as Bazurto lost motor
    control and died. Miller testified that Bazurto continued to
    move for three to five minutes after being shot.
    Mann then called a friend, Carlos Alejandro, to help him
    dispose of the two bodies. They dumped the bodies on the
    side of a gravel road. The next day, Mann and Miller cleaned
    the apartment and patched the walls where the bullets that had
    killed Alberts and Bazurto had entered. Mann gave Alberts’s
    car to a friend and disposed of his guns and the recovered
    bullets. When police later questioned Mann as to the
    whereabouts of Alberts and Bazurto, Mann responded that the
    two men had come to his house on the evening of the murders
    8                      MANN V. RYAN
    to conduct a drug deal, but had left after Mann and Alberts
    failed to agree on a price for the drugs.
    The case remained unsolved for four years. Then, in late
    1993, Miller ended her relationship with Mann because of
    increasing domestic violence. She told the police about the
    murders in January of 1994. Mann was arrested after the
    police corroborated Miller’s story with Alejandro and the
    man to whom Mann had sold Alberts’s car.
    B. Trial
    Mann’s jury trial took place over five days in the Superior
    Court of Pima County, Arizona. Judge John F. Kelly
    presided. David Sherman, a criminal defense attorney in
    private practice, was appointed as Mann’s counsel. Sherman
    pursued the theory that Mann had acted in self-defense.
    The day before trial commenced, Sherman told the judge
    that he would not be calling any witnesses “except for Mr.
    Mann.” Sherman successfully persuaded the trial court that,
    should Mann testify, his previous conviction for burglary
    would be excluded from evidence and any mention of his
    previous conviction for felony possession of a firearm would
    be limited to the fact that he had been convicted of a felony.
    At trial, the state presented testimony from six witnesses,
    including Miller and Alejandro, both of whom had been
    granted immunity from prosecution for their roles in the
    crime. Miller and Alejandro testified that the murders had
    been premeditated. Mann ultimately did not testify, and
    Sherman did not call any witnesses of his own, instead
    attempting to discredit the state’s witnesses through cross-
    MANN V. RYAN                         9
    examination. The jury found Mann guilty of two counts of
    first-degree murder on November 1, 1994.
    Two weeks later, the court granted Sherman’s request that
    Mann undergo psychological evaluation prior to sentencing.
    Sherman recommended that the court appoint Dr. Todd
    Flynn, a psychologist with the court psychological clinic.
    With the consent of the attorney for the state, the judge
    agreed to appoint Dr. Flynn to perform an evaluation.
    Dr. Flynn diagnosed Mann with alcohol abuse or
    dependence, polysubstance abuse or dependence, and
    antisocial personality disorder. He also noted that Mann had
    scored highly for “acting out” on the Minnesota Multiphasic
    Personality Inventory-2 scale, and made the following
    observation:
    As a group, people with acting out as a
    primary psychological defense tend to be
    emotionally shallow, deficient in their
    capacity for empathy, poor at frustration
    tolerance, unwilling or unable to delay
    gratification, and poor at anticipating the
    consequences of future actions.         When
    combined with a history of victimization of
    others, this group becomes the worst of
    offenders because there is little sense of
    conscience or inhibition to stop the criminal
    lifestyle. Those who act out intensively and
    in a criminal manner may also qualify for the
    designation of Psychopath . . . .
    The report concluded, “It is more probable than not that Mr.
    Mann fits this designation.”
    10                      MANN V. RYAN
    The state’s presentence report concluded that three
    aggravating factors were present in the crime: it was
    committed for pecuniary gain, there were two victims, and
    Bazurto’s murder was committed “in an especially heinous,
    cruel or depraved manner.” Sherman argued for ten
    mitigating factors: Mann’s positive relationship with his
    daughters, his positive influence on his mother, his unstable
    and abusive family background, his poor educational
    experience, his history of substance abuse, his remorse, his
    cooperation with authorities, his non-violent history, his good
    behavior while incarcerated, and the disparity between his
    sentence and Miller and Alejandro’s sentences.
    At the sentencing hearing, which took place on January
    31, 1995, four witnesses testified in support of Mann: a
    former boss, a former co-worker, his older daughter, and his
    mother. Mann also submitted a handwritten autobiography.
    Judge Kelly found that the state had demonstrated all
    three of the aggravating circumstances they had identified:
    (1) the crime was committed for pecuniary gain, (2) there
    were two victims, and (3) Bazurto’s murder was committed
    “in an especially heinous, cruel or depraved manner.”
    As for mitigating factors, he found that Mann had a
    positive relationship with his daughters and his mother, an
    abusive and unstable family background, a poor educational
    experience, a history of substance abuse, good conduct while
    incarcerated, and recent stable employment. The judge
    declined to find that Mann had cooperated with the
    authorities, that he had a non-violent history, or that a capital
    sentence would be disproportionate to sentences imposed on
    Miller and Alejandro.
    MANN V. RYAN                                 11
    The judge concluded that Mann, “by his actions for a
    period of four years . . . showed no indication of any remorse,
    particularly his actions as introduced at trial after the
    murders.” The court noted that in his autobiography Mann
    described getting into a car accident in which two people
    died, but observed that “he indicates no remorse in that
    situation.” Ultimately, the judge concluded: “[T]he defendant
    is not capable of remorse. The psychological evaluation is
    that he has an anti-social personality disorder and that he is a
    psychopath. Basically, that he has no conscience. The Court
    believes that his expression[s] of remorse are not genuine.”
    The judge sentenced Mann to death on both counts of
    murder.1
    Mann appealed to the Arizona Supreme Court, which
    affirmed. State v. Mann, 
    934 P.2d 784
     (Ariz. 1997) (en
    banc). The United States Supreme Court denied Mann’s
    petition for a writ of certiorari. Mann v. Arizona, 
    522 U.S. 895
     (1997) (mem.).
    C. Post-conviction relief proceedings
    Mann filed for post-conviction relief under Rule 32 of the
    Arizona Code of Criminal Procedure. He alleged, among
    other claims, that he had been denied effective representation
    of counsel at trial and sentencing and that newly discovered
    1
    Until 2002, Arizona’s sentencing scheme in capital prosecutions
    allowed the trial judge to determine “the presence or absence of the
    aggravating factors required by Arizona law for imposition of the death
    penalty.” Ring v. Arizona, 
    536 U.S. 584
    , 588 (2002). In that year, the
    Supreme Court held that this system violated the Sixth Amendment right
    to a jury trial. 
    Id. at 609
    . Two years later, in Schriro v. Summerlin, 
    542 U.S. 348
    , 358 (2004), the Court clarified that the new rule set forth in Ring
    did not apply retroactively to cases already final on direct review.
    12                    MANN V. RYAN
    evidence probably would have changed the verdict at the trial
    or sentencing. Among the arguments in his post-conviction
    brief, Mann claimed that Sherman “did little mitigation
    investigation or preparation for the mitigation hearing.” The
    brief described Mann’s 1985 automobile accident in great
    detail, including his remorse at the deaths of his two
    passengers, the injuries to his leg and head, and the changes
    in his personality and circumstances that resulted.
    Mann also filed two additional expert reports: one from
    Dr. Richard Hinton, a clinical psychologist, and one from Dr.
    James Comer, a clinical neuropsychologist. Dr. Hinton’s
    report concluded:
    Despite Mr. Mann’s extremely difficult
    childhood and his relatively long pedigree as
    a violator of the law, it does appear that his
    functioning changed dramatically following
    the automobile accident. At that time he
    experienced a severe injury to his leg which
    caused him to be unable to work and which
    resulted in mounting debt. It also appears
    likely that he was tormented by a sense of
    guilt that he was somewhat responsible for the
    death of the two passengers in his car. From
    that time forward he began to behave much
    more aggressively and to use cocaine much
    more regularly.
    Dr. Comer’s report concluded that “Mann appears to have
    experienced a T[ramuatic ]B[rain ]I[njury] leading to subtle
    though lasting cognitive deficits and other symptoms of post-
    concussional syndrome.”
    MANN V. RYAN                              13
    The post-conviction proceedings were assigned to Judge
    Kelly, the same judge who had presided over Mann’s trial
    and sentencing. Judge Kelly held several evidentiary
    hearings, in which he heard testimony from Miller,2 Mann,
    Sherman, and Dr. Comer. The bulk of the post-conviction
    factfinding concerned the 1985 car crash. Miller testified that
    “[t]hings took a drastic turn” after the accident, that the
    doctors who examined Mann after the accident were “very
    concerned that he had had some head injuries,” and that he
    became “very depressed.” In particular, she said, the
    information that Mann’s 14-year-old passenger had been
    decapitated in the accident “really tore him up” and “many
    times he said he wished he had died in the accident too.”
    Mann testified that he had “suffered some type of
    concussion” as a result of the accident and that the accident
    “was a huge burden emotionally, physically, the way it
    affected friends, family.” Sherman testified that he had not
    learned of the severity of the accident until after Mann’s
    conviction and that he was “not focused on mitigation”
    during his representation.
    Dr. Comer testified that some of Mann’s test results
    suggested “that he may have experienced a head injury, from
    which he recovered rather well in most respects, but which
    had left [him] with some residual, subtle cognitive deficits.”
    Dr. Comer noted that it was the “typical course of events” for
    the effects of a brain injury to be more severe closer in time
    to the accident, and that behavioral changes stemming from
    a brain injury generally “take the form of increased
    2
    By the time of the post-conviction proceedings, Karen Miller had
    married and changed her name. For purposes of clarity and consistency,
    this opinion will continue to refer to her by her name at the time of
    Mann’s trial.
    14                     MANN V. RYAN
    aggression, sexual indiscretions, poor ability to monitor one’s
    behavior, difficulty in appreciating the effect of one’s
    behavior on other individuals, increased irritability, agitation
    at times, [and increased] egocentricity.” He also noted that
    the records that he reviewed “certainly indicated that there
    was a significant behavioral and emotional change, perhaps
    some change in personality as well” that occurred after the
    1985 accident. He clarified that any one of the test results
    “could easily have been produced by other factors as well,”
    but that the significant majority of the test results “fell into
    that cluster of tests that are known to be sensitive to subtle,
    longlasting effects” from brain damage.
    Judge Kelly responded to Dr. Comer’s testimony by
    commenting that it was “not clear how such a brain injury
    could have a role” in Mann’s crimes, as they had been
    planned out in advance without “any indication . . . that the
    murders were committed out of anger or irritability.” Dr.
    Comer replied that he was not stating a finding that Mann’s
    head injury caused him to commit the crimes but rather that
    “some of the behavior we see postconcussion could produce
    the disinhibitory aggression” that followed Mann’s accident.
    Judge Kelly denied Mann’s Rule 32 petition in full in an
    order that will be discussed in more detail below.
    Subsequently, the Arizona Supreme Court summarily denied
    Mann’s petition for review on all issues except for the jury
    determination of aggravating factors, which is not at issue in
    this appeal. Mann then filed a federal habeas petition in the
    District of Arizona. The district court denied the petition but
    issued a Certificate of Appealability for three claims: that the
    Arizona Supreme Court violated Mann’s Eighth Amendment
    rights in reviewing his death sentence, that he received
    ineffective assistance of counsel at trial, and that he received
    MANN V. RYAN                          15
    ineffective assistance of counsel at sentencing. Mann has
    limited his appeal to the two claims of ineffective assistance
    of counsel.
    A three-judge panel of this court unanimously affirmed
    the denial of habeas relief for ineffective assistance of
    counsel at trial, but, over a dissent, reversed the denial of
    habeas relief for ineffective assistance of counsel at
    sentencing. Mann v. Ryan, 
    774 F.3d 1203
     (9th Cir. 2014). A
    majority of the nonrecused active judges on our court
    subsequently voted to rehear the case en banc. Mann v. Ryan,
    
    797 F.3d 654
     (9th Cir. 2015) (mem.). We affirm the district
    court’s denial of habeas relief on the ineffective assistance of
    counsel claims at both trial and sentencing.
    II. Legal Standards
    A. Antiterrorism and Effective Death Penalty Act
    Because Mann filed this petition for habeas corpus after
    April 24, 1996, AEDPA applies to his claims. See Lindh v.
    Murphy, 
    521 U.S. 320
    , 326 (1997). Under that statute we
    may not grant an application for habeas corpus for any claim
    adjudicated on the merits in state court unless the state court
    adjudication:
    (1) resulted in a decision that was contrary to,
    or involved an unreasonable application of,
    clearly established Federal law, as determined
    by the Supreme Court of the United States; or
    (2) resulted in a decision that was based on an
    unreasonable determination of the facts in
    16                     MANN V. RYAN
    light of the evidence presented in the State
    court proceeding.
    
    28 U.S.C. § 2254
    (d). We review the last reasoned state court
    decision according to this deferential standard. Towery v.
    Ryan, 
    673 F.3d 933
    , 944 (9th Cir. 2012) (per curiam). The
    district court’s application of AEDPA to the last reasoned
    state court decision is a mixed question of law and fact which
    we review de novo. Lambert v. Blodgett, 
    393 F.3d 943
    , 965
    (9th Cir. 2004).
    An adjudication is “contrary to” clearly established
    Supreme Court precedent “if the state court arrives at a
    conclusion opposite to that reached by [the Supreme] Court
    on a question of law or if the state court decides a case
    differently than [the Supreme] Court has on a set of
    materially indistinguishable facts.” Williams v. Taylor, 
    529 U.S. 362
    , 412–13 (2000). It is an “unreasonable application”
    of clearly established Supreme Court precedent “if the state
    court identifies the correct governing legal principle from [the
    Supreme] Court’s decisions but unreasonably applies that
    principle to the facts of the prisoner’s case.” 
    Id. at 413
    .
    “[A]n unreasonable application of federal law is different
    from an incorrect application of federal law.” 
    Id. at 410
    . The
    federal habeas court “may not issue the writ simply because
    that court concludes in its independent judgment that the
    relevant state-court decision applied clearly established
    federal law erroneously or incorrectly.” 
    Id. at 411
    .
    A state court’s adjudication is unreasonable only if the
    federal habeas court concludes that no fairminded jurist could
    conclude that the adjudication was consistent with established
    Supreme Court precedent. See Richter, 
    562 U.S. at 102
    . In
    that event, AEDPA does not require deference to the state
    MANN V. RYAN                         17
    court’s decision, and the petitioner’s claims are reviewed de
    novo. See Williams, 
    529 U.S. at 406
    .
    B. Ineffective assistance of counsel
    Mann’s claims are based on the alleged violation of his
    Sixth and Fourteenth Amendment rights to effective
    assistance of counsel during both the trial and penalty phases
    of his state court proceedings. Ineffective assistance of
    counsel claims are evaluated according to the familiar
    standard set forth in Strickland. To receive relief under this
    standard, “[f]irst, the defendant must show that counsel’s
    performance was deficient.” 
    466 U.S. at 687
    . “Second, the
    defendant must show that the deficient performance
    prejudiced the defense.” 
    Id.
     “Unless a defendant makes both
    showings, it cannot be said that the conviction or death
    sentence resulted from a breakdown in the adversary process
    that renders the result unreliable.” 
    Id.
    The proper standard for attorney performance under the
    first prong of the Strickland test is “that of reasonably
    effective assistance.” 
    Id.
     “When a convicted defendant
    complains of the ineffectiveness of counsel’s assistance, the
    defendant must show that counsel’s representation fell below
    an objective standard of reasonableness.” 
    Id.
     at 687–88.
    “Judicial scrutiny of counsel’s performance must be highly
    deferential,” and “a court must indulge a strong presumption
    that counsel’s conduct falls within the wide range of
    reasonable professional assistance.” 
    Id. at 689
    .
    The second prong of the Strickland test requires that the
    defendant show “that there is a reasonable probability that,
    but for counsel’s unprofessional errors, the result of the
    proceeding would have been different.” 
    Id. at 694
    . “A
    18                      MANN V. RYAN
    reasonable probability is a probability sufficient to undermine
    confidence in the outcome.” 
    Id.
     “It is not enough for the
    defendant to show that the errors had some conceivable effect
    on the outcome of the proceeding.” 
    Id. at 693
    .
    III.      Ineffective Assistance of Counsel at Trial
    Mann first argues that he received ineffective assistance
    of counsel during the trial phase of his proceedings. This
    argument is based on the alleged negligence of Mann’s
    counsel, Sherman, in (1) failing to recommend that Mann
    testify at trial, and (2) breaking an “implicit” promise to the
    jury that Mann would testify in his own defense. Because the
    Arizona Supreme Court summarily denied the petition for
    review of this claim, we look through that decision to the
    decision of the state post-conviction court. See Towery, 673
    F.3d at 944.
    A. Sherman’s recommendation that Mann not testify at
    trial
    Mann and Sherman presented conflicting accounts of
    their relationship to the state post-conviction court. Sherman
    testified that Mann told him “early on in th[e] case” that the
    murders had been premeditated. Despite this knowledge,
    Sherman advised Mann that a self-defense theory “would be
    the best way to go.” Sherman said he gave Mann the option
    to testify at trial that he had acted in self-defense, but told
    Mann he “would have to withdraw as his attorney” if Mann
    did so because Sherman knew this testimony would be false.
    In a letter to Mann approximately one month before trial,
    Sherman laid out conflicting considerations for Mann to
    weigh. On the one hand, Mann was the only witness who
    would be able to testify to his story, which was that Bazurto
    MANN V. RYAN                         19
    had reached for his gun and Mann reacted without thinking.
    On the other hand, Mann could be cross-examined about his
    previous criminal activity, as well as allegations of abuse
    from his former girlfriends. The letter concluded: “I’d hate
    to have you on death row in Florence having a big regret
    because you did not testify. When the stakes are this high, I
    have to leave the final decision up to you.”
    Mann, in contrast, testified that he told Sherman from the
    beginning that he had killed Alberts and Bazurto in self-
    defense. Mann said that he and Sherman “briefly” discussed
    the possibility that Mann would testify at trial, but that
    Sherman told Mann that “it would be bad” for him to testify
    because it would open the door to questions about his prior
    conviction for felony possession of a weapon. Mann said that
    he took his attorney’s advice and did not testify.
    The state post-conviction court concluded that Sherman
    was more credible than Mann and accepted Sherman’s
    version of the facts as the truth.
    Our review of the state habeas court’s credibility
    determinations is highly deferential. Marshall v. Lonberger,
    
    459 U.S. 422
    , 434 (1983) (“
    28 U.S.C. § 2254
    (d) gives federal
    habeas courts no license to redetermine credibility of
    witnesses whose demeanor has been observed by the state
    trial court. . . .”).
    Mann points to some possible inconsistencies in
    Sherman’s story: Sherman did not mention in his letter that
    he would withdraw from representation if Mann testified, and
    he continued to prepare for the possibility that Mann might
    testify up until the day before trial. Sherman had plausible
    explanations, however. Sherman said he never told Mann he
    20                      MANN V. RYAN
    couldn’t testify, but rather that “if he cho[s]e to do it against
    my recommendation, I would have to withdraw as his
    attorney and he could get another attorney to do that, but I
    wasn’t going to put him on the stand.” As for the letter,
    Sherman testified that he was “finessing the situation” and
    did not want to put the potential perjury in writing. Given
    these considerations, and Mann’s obvious motivation to lie,
    it is impossible to conclude that the state court’s findings as
    to Mann and Sherman’s relative credibility “lacked even
    ‘fair[ ] support’ in the record.” 
    Id. at 432
    .
    Once the state court had found that Sherman was a more
    credible witness than Mann, it was effectively bound by
    Supreme Court precedent to conclude that Sherman’s
    decision to discourage Mann from testifying did not
    constitute ineffective assistance of counsel. Counsel’s duty
    to advocate for his client is “[p]lainly . . . limited to
    legitimate, lawful conduct compatible with the very nature of
    a trial as a search for truth.” Nix v. Whiteside, 
    475 U.S. 157
    ,
    166 (1986). “Although counsel must take all reasonable
    lawful means to attain the objectives of the client, counsel is
    precluded from taking steps or in any way assisting the client
    in presenting false evidence or otherwise violating the law.”
    
    Id.
     Sherman would have been suborning perjury if, knowing
    that the murders had been premeditated, he had allowed
    Mann to testify in support of the theory of self-defense.
    Under such circumstances, there can be “no failure to adhere
    to reasonable professional standards that would in any sense
    make out a deprivation of the Sixth Amendment right to
    counsel.” 
    Id. at 171
    .
    MANN V. RYAN                          21
    B. Testimony promised in opening statement
    Mann’s claim that Sherman broke an implicit promise to
    the jury that Mann would testify in his own defense is
    similarly unavailing. Had Sherman made such a promise, and
    then broken it, Mann’s claim might have merit. Several
    circuits have held that it may violate Strickland for counsel to
    promise evidence in an opening statement and then fail to
    present that evidence at trial. See, e.g., United States ex rel.
    Hampton v. Leibach, 
    347 F.3d 219
    , 258 (7th Cir. 2003)
    (finding that it was “objectively unreasonable” for counsel to
    promise the defendant’s testimony and then break that
    promise); Ouber v. Guarino, 
    293 F.3d 19
    , 27 (1st Cir. 2002)
    (describing counsel’s decision to discourage the defendant
    from taking the stand as “indefensible” when he had already
    represented to the jury that the defendant’s testimony would
    be the centerpiece of her defense); McAleese v. Mazurkiewicz,
    
    1 F.3d 159
    , 166 (3d Cir. 1993) (noting generally that an
    attorney’s failure to produce evidence promised during an
    opening statement is “sufficient of itself to support a claim of
    ineffectiveness of counsel”).
    But Sherman did not promise the jury that Mann would
    testify. His opening statement detailed the alternative version
    of events that formed the basis for his defense strategy: he
    told the jury that Mann had cocaine he intended to sell to
    Alberts, and that as Mann was handing over the drugs to
    Alberts, Bazurto “did something that made [Mann] think he
    was about to be the victim of a drug rip-off.” In reaction,
    Mann “fired at both people and killed them both because he
    felt like he was forced to do so.” Sherman then said, “Now,
    look at what the facts are. After that we’ll see [Mann] didn’t
    plan this.” He told the jury to anticipate the testimony of
    Miller and Alejandro, which he described as “the only
    22                     MANN V. RYAN
    evidence that the[ state will] have of premeditation,” and
    argued that “[w]hen you compare that to the whole story, it
    doesn’t make any sense that if it was planned it would be
    done this way.”
    At trial, Sherman successfully elicited testimony from
    Miller and Alejandro that was inconsistent with the
    prosecution’s theory that the murders were premeditated. For
    instance, he noted that Miller had testified to standing directly
    behind Bazurto when he was killed, which she admitted was
    “awfully close to what the line of fire was going to be” for
    someone who allegedly knew Bazurto was about to be shot.
    Miller also testified that there had been no plan to dispose of
    the bodies. Alejandro testified that the first time he heard
    anything about Mann’s plan was when Mann showed up at
    his house the night of the crime asking for help. He described
    Mann as having been “[i]n desperate need,” and said that the
    first thing Mann said to him that night was, “I did it. I had no
    choice. I had to do it.” In other words, Sherman’s opening
    argument “merely summarized evidence that was later
    produced from which a jury could be left with a reasonable
    doubt” about whether the crimes were premeditated.
    McAleese, 
    1 F.3d at 167
    . This may not have been a
    successful trial strategy, but it was not improper.
    IV.     Ineffective Assistance of Counsel at Sentencing
    Mann also argues that the state court erred in declining to
    grant habeas relief based on his claim that he had received
    ineffective assistance of counsel at the sentencing stage of his
    proceedings. His argument before the state post-conviction
    court focused on two alleged failings: (1) failure to present
    reasonably available mitigation evidence at sentencing, and
    (2) failure to seek adequate assistance in evaluating Mann’s
    MANN V. RYAN                         23
    mental health. The last reasoned state court decision on this
    issue came from the post-conviction court, so that is the
    decision we review. See Towery, 673 F.3d at 944.
    Under Strickland, Mann is eligible for post-conviction
    relief if he can show both (1) deficient performance, and (2)
    prejudice stemming from the deficient performance. 
    466 U.S. at 687
    . When addressing Sherman’s alleged failure to
    present reasonably available mitigation evidence at
    sentencing, the post-conviction court did not consider
    whether Sherman’s performance was deficient. Rather, it
    elected to move directly to the second prong, as it was
    entitled to do, and found only that there had been no
    prejudice. Because the prejudice issue has been “adjudicated
    on the merits,” AEDPA requires us to allow the state court’s
    determination to stand unless it is contrary to or an
    unreasonable application of federal law or is based on an
    unreasonable determination of the facts. Richter, 
    562 U.S. at 98
    .
    On appeal, Mann argues that the state post-conviction
    court’s analysis of prejudice was contrary to clearly
    established federal law. He also argues that, on the merits,
    Sherman’s performance caused Mann prejudice. We address
    these arguments in order because our evaluation of the first
    determines the standard of review to be applied to the second.
    First, we assess whether the state court’s decision was
    contrary to clearly established federal law as determined by
    the Supreme Court. Second, we assess whether Sherman’s
    performance caused Mann prejudice. If we conclude at the
    first step that the state court misapplied clearly established
    federal law, then our review at the second step is de novo.
    See Williams, 
    529 U.S. at 406
    . If, however, the court’s
    interpretation of the law was permissible, then AEDPA
    24                     MANN V. RYAN
    governs our review at the second step as well, and we are
    required to defer to the state court’s conclusion that Mann
    suffered no prejudice from his counsel’s alleged failings
    unless that finding was unreasonable.
    A. Applicability of AEDPA
    Mann argues that we should review his Strickland claim
    de novo because the state post-conviction court made three
    different legal decisions that were contrary to or an
    unreasonable application of clearly established federal law.
    One, he argues that the state post-conviction court applied the
    wrong standard in assessing prejudice under Strickland. Two,
    he argues that the state court improperly excluded the
    mitigating evidence presented during post-conviction
    proceedings because Mann had not demonstrated a causal
    link between the evidence and the crime. Three, he argues
    that the court failed to re-weigh the evidence in aggravation
    against the totality of the mitigation evidence, including
    evidence introduced during the sentencing and during post-
    conviction proceedings. None of these three allegations gives
    us a basis to conclude that AEDPA does not apply to Mann’s
    claims.
    i. Strickland’s prejudice standard
    The common standard for a motion for a new trial based
    on newly discovered evidence requires a defendant to “show
    that counsel’s deficient conduct more likely than not altered
    the outcome in the case.” Strickland, 
    466 U.S. at
    693–94.
    The Supreme Court considered adopting this standard for the
    Strickland prejudice inquiry but determined that it was “not
    quite appropriate.” 
    Id. at 694
    . Instead, the Court held that a
    defendant alleging ineffective assistance of counsel “must
    MANN V. RYAN                                25
    show that there is a reasonable probability that, but for
    counsel’s unprofessional errors, the result of the proceeding
    would have been different.” 
    Id.
     This sets the bar a bit lower
    but not a lot lower. “[T]he difference between Strickland’s
    prejudice standard and a more-probable-than-not standard is
    slight and matters ‘only in the rarest case.’” Richter, 
    562 U.S. at 112
     (quoting Strickland, 
    466 U.S. at 697
    ).
    The claims presented by Mann in the state post-conviction
    proceedings at issue here included an argument that new
    mitigation evidence related to the 1985 accident merited a
    new sentencing. Those claims were identified as “Issues
    Three and Four.”3 Mann’s claim that Sherman’s failure to
    raise the evidence at the original sentencing constituted
    ineffective assistance of counsel was described as “Issue
    Seven.” Judge Kelly denied relief on both claims.
    As to Issues Three and Four, he found:
    The record shows that Defendant provided
    this Court with evidence of the accident and
    its effects in the form of an autobiography he
    presented to show mitigation. Nonetheless,
    additional evidence, particularly that set forth
    in psychological reports, was submitted as
    part of this Petition. The Court finds,
    however, that nothing presented would have
    changed the verdict or the sentence imposed.
    The Court finds that Defendant has not proven
    3
    Mann did not receive a Certificate of Appealability as to these claims
    and does not raise them on appeal. We discuss them here only because
    they are relevant to determining the standard that the state post-conviction
    relief court applied to the ineffective assistance of counsel claim.
    26                     MANN V. RYAN
    the existence of a causal connection between
    the accident and its effects and the murders.
    The record shows, for example, that
    Defendant dealt drugs and used guns against
    others before and after the accident; that he
    did not misperceive a threat and overreact,
    but, rather, carefully planned to kill Alberts,
    then “made a choice, after a period of thought
    and said, ‘Well, I’ve got to do it,’ apparently
    meaning that to go through with the plan he
    would also have to murder Bazurto.”
    Defendant committed these murders for
    pecuniary gain, not for reasons traceable to his
    1985 accident. Accordingly, the claims are
    denied.
    (emphasis added) (citation omitted).
    Meanwhile, as to Issue Seven, Judge Kelly found:
    To succeed on this claim and on the others
    that follow below, Defendant must show that:
    (1) counsel’s performance was deficient, as
    defined by prevailing professional norms; and
    (2) the deficient performance resulted in
    prejudice to the defense. State v. Nash, 
    143 Ariz. 392
    , 
    694 P.2d 222
     (1985). Here,
    Defendant has failed to show prejudice. Some
    of the evidence he accuses Sherman of not
    presenting, e.g., testimony from family
    members, was in fact presented to this Court
    at sentencing. Additional evidence that
    pertains to the 1985 accident and its effects is
    discussed under “Issues Three and Four”
    MANN V. RYAN                         27
    above, where this Court found that it would
    not have changed the sentence imposed. For
    that reason, Defendant was not prejudiced by
    counsel’s performance and the claim is
    denied.
    Mann argues that the state post-conviction court’s
    conclusion that the new evidence “would not have changed
    the sentence imposed,” combined with the court’s reference
    to the analysis for “Issues Three and Four,” suggests that it
    applied the wrong standard in analyzing Mann’s ineffective
    assistance of counsel claim. Rather than finding that there
    was no reasonable probability that the new evidence would
    have changed the sentence imposed, Mann argues, the post-
    conviction court imported the standard from its analysis of
    the motion for a new trial into its analysis of the ineffective
    assistance of counsel claim and concluded only that the new
    evidence more likely than not would not have changed the
    sentence imposed.
    Had the state post-conviction court applied the more-
    likely-than-not standard to analyze Mann’s ineffective
    assistance of counsel claims, its opinion would have been
    contrary to clearly established federal law under AEDPA.
    The Supreme Court considered and explicitly rejected the
    more-likely-than-not standard in Strickland. 
    466 U.S. at
    693–94. But the standard the court applied is not clear on the
    surface of its decision. Judge Kelly simply said that the
    additional information about Mann’s accident “would not
    have changed the sentence imposed.” This leaves us to draw
    inferences as to the precise standard the court used in
    reaching the decision to deny each of Mann’s claims.
    28                     MANN V. RYAN
    Reading the opinion as a whole, the more logical
    inference here is that the standard used by the state post-
    conviction court was the correct reasonable probability
    standard. While the court did not clearly state the standard it
    applied, either for the newly discovered evidence claim or for
    the ineffective assistance of counsel claim, it indicated that
    the ineffective assistance of counsel claim was controlled by
    State v. Nash, 
    694 P.2d 222
     (Ariz. 1985), in which the
    Arizona Supreme Court adopted the reasonable probability
    standard.
    Judge Kelly also made various factual findings that
    suggested he was deeply skeptical that evidence about the
    accident had any significant impact on Mann’s mitigation
    profile. Most importantly, he noted that Mann dealt drugs
    and used guns prior to the accident, premeditated both
    murders, and committed them for pecuniary gain. Taken in
    context, the judge’s discussion of Issues Three, Four, and
    Seven suggests that he knew the proper standard for both the
    new evidence claim and the ineffective assistance of counsel
    claim, but concluded that the new evidence made at most a
    minimal difference, such that the standard applied would
    have no effect on the outcome of either claim. This inference
    is particularly strong because Judge Kelly was the same judge
    who had handed down Mann’s initial sentence, giving him
    particular insight into how the additional evidence would, or
    would not, have changed Mann’s mitigation profile. See
    Schriro v. Landrigan, 
    550 U.S. 465
    , 476 (2007) (noting that
    the judge presiding over the post-conviction review was
    “ideally situated” to interpret an interaction that had taken
    place in the trial court because she had also presided over the
    trial). Because of that fact, it is not surprising that Judge
    Kelly would have spoken in direct terms—“nothing presented
    would have changed the verdict or the sentence imposed”—
    MANN V. RYAN                         29
    rather than in words designed to express degrees of
    probability.
    At worst, the state court opinion is ambiguous. But, as we
    have noted in the past, “[u]nder AEDPA, we must do more
    than find the statement ambiguous.” Lopez v. Schriro, 
    491 F.3d 1029
    , 1037–38 (9th Cir. 2007). Our analysis starts with
    a “presumption that state courts know and follow the law.”
    Woodford v. Visciotti, 
    537 U.S. 19
    , 24 (2002). Next, we
    “determine what arguments or theories supported or . . . could
    have supported[] the state court’s decision.” Richter, 
    562 U.S. at 102
    . Finally, we ask “whether it is possible
    fairminded jurists could disagree that those arguments or
    theories are inconsistent with the holding in a prior decision
    of th[e Supreme] Court.” 
    Id.
     Here, it is possible to read the
    state court’s decision in a way that comports with clearly
    established federal law. The judge, who had imposed the
    sentence originally and who was already familiar with
    Mann’s mitigation profile, concluded that the additional
    information provided at the post-conviction hearing would
    have made little difference. Accordingly, he denied Mann’s
    petition for post-conviction relief. Under AEDPA, because
    we can read the decision to comport with clearly established
    federal law, we must do so. We cannot conclude that the
    state post-conviction court’s application of Strickland
    misunderstood or misapplied clearly established federal law.
    ii. Causal nexus
    Mann also argues that the state post-conviction court
    violated clearly established federal law when it improperly
    refused to consider evidence about Mann’s car accident
    because he had “not proven the existence of a causal
    connection between the [1985 car] accident and its effects
    30                    MANN V. RYAN
    and the murders.” This argument relies on Eddings v.
    Oklahoma, in which the Supreme Court held that the “Eighth
    and Fourteenth Amendments require that the sentencer . . .
    not be precluded from considering, as a mitigating factor, any
    aspect of a defendant’s character or record and any of the
    circumstances of the offense that the defendant proffers as a
    basis for a sentence less than death.” 
    455 U.S. 104
    , 110
    (1982) (quoting Lockett v. Ohio, 
    438 U.S. 586
    , 604 (1978)).
    “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.” 
    Id.
     at 114–15.
    Our court has concluded that the law in Arizona at the
    time of Mann’s post-conviction proceedings, in spite of this
    clear command, required that defendants demonstrate “actual
    causation” linking their alleged mitigating circumstances with
    the crime for which they were being sentenced. McKinney v.
    Ryan, 
    813 F.3d 798
    , 815 (9th Cir. 2015) (en banc). The
    causal nexus test provided that, “[i]f the defendant fails to
    prove causation, the circumstance will not be considered
    mitigating. However, if the defendant proves the causal link,
    the court then will determine what, if any, weight to accord
    the circumstance in mitigation.” State v. Hoskins, 
    14 P.3d 997
    , 1022 (Ariz. 2000) (en banc). In Tennard v. Dretke, the
    Supreme Court held that a comparable causal nexus test
    violated defendants’ Eighth Amendment right requiring the
    finder of fact to “‘be able to consider and give effect to’ a
    capital defendant’s mitigating evidence.” 
    542 U.S. 274
    , 285
    (2004) (quoting Boyde v. California, 
    494 U.S. 370
    , 377–78
    (1990)).
    Mann does not and cannot argue here that the state post-
    conviction court violated clearly established federal law by
    MANN V. RYAN                         31
    applying Arizona’s unconstitutional causal nexus test. Mann
    did not present a post-conviction Eddings claim before the
    Arizona Supreme Court, so we have no jurisdiction to grant
    relief on that issue. See Rose v. Lundy, 
    455 U.S. 509
    , 515
    (1982). Mann contends that what effectively amounts to an
    Eddings claim nevertheless comes in on the back of his
    Strickland claim, since Judge Kelly applied the causal nexus
    test to bar evidence about the effects of the accident and
    therefore did not properly consider whether Sherman’s failure
    to present that evidence at sentencing led to a “reasonable
    probability that, but for counsel’s unprofessional errors, the
    result of the proceeding would have been different.”
    Strickland, 
    466 U.S. at 694
    .
    This argument fails to acknowledge that Judge Kelly’s
    comment about the lack of a causal connection between the
    accident and the murders was directly responsive to the
    evidence Mann presented before the state post-conviction
    court. Dr. Hinton’s neuropsychological report concluded that
    “it does appear that [Mann’s] functioning changed
    dramatically following the automobile accident,” noting that
    “[f]rom that time forward he began to behave much more
    aggressively and to use cocaine much more regularly.” Dr.
    Comer’s evaluation concluded that “Mann’s functioning had
    changed dramatically after the [accident], as exemplified by
    increased aggression.” Meanwhile, Miller testified that, after
    the accident, Mann “began to intimidate people,” “liked to
    use power to scare people,” and “was ‘pointing guns to
    people’s heads and telling them . . . don’t fuck with me [or]
    I’ll blow your head off.” Miller stated that she believed that
    “the change in [Mann] was a result of the accident, the
    trauma, and the cocaine use.” In his petition for post-
    conviction relief, Mann argued:
    32                     MANN V. RYAN
    There is no question that this evidence, if
    presented to the Court in mitigation, could
    have resulted in a sentence other than death.
    As described by Karen Miller, the killing of
    Bazurto and Alberts was of a piece with the
    change that occurred in Petitioner as a result
    of the accident. It was a crime of power and
    money, and the clear result of the fundamental
    personality and character changes that
    occurred in Eric Mann as a result of the
    accident.
    The dissent notes, at 44, that Mann argued at the post-
    conviction hearing that the new evidence as to the effects of
    the accident would have suggested a mitigating reason for
    some of his behavior and “would have provided some free-
    standing mitigation of itself.” As we have noted in the past,
    however, courts generally find explanatory mitigation
    evidence more convincing than humanizing mitigation
    evidence. See Allen v. Woodford, 
    395 F.3d 979
    , 1006 (9th
    Cir. 2005). Perhaps recognizing this, Mann focused his
    attention on arguing that the circumstances and the
    neuropsychological effects of the accident explained his
    decision to commit murder. Thus, while the dissent may be
    correct that the post-conviction court did not discuss how
    Mann’s brain damage could have reduced his moral
    culpability or altered his sentencing profile apart from having
    contributed to the crime, that was not the core of the
    argument to which the post-conviction court responded.
    Mann’s substantive arguments at the post-conviction hearing
    were focused on the link between the accident and the
    murders. He argued that after the accident, “the nature of his
    problems and degree of his problems and degree of his
    behavior changed radically,” that Dr. Comer “concluded
    MANN V. RYAN                         33
    either because of the accident or the aftermath of the accident
    or his heavy drug use, it’s not unreasonable to conclude that
    Mr. Mann might have perceived a threat and that he
    overreacted,” and that Dr. Comer had “ma[d]e a connection”
    between the murders and “what people with the kind of injury
    . . . Mann was determined to have . . . ordinarily do.” The
    court could not have properly addressed these arguments
    without considering the causal relationship between the new
    evidence and the crimes.
    In addition, it is clear elsewhere in the record that Judge
    Kelly did not exclude evidence from his mitigation
    assessment based solely on the lack of a causal nexus with the
    crime when that evidence was not presented as causal. For
    instance, he found during sentencing that Mann had
    demonstrated several mitigating factors unrelated to the
    murders, including that Mann had an “unstable and abusive
    family background,” a poor educational background, and a
    history of substance abuse.
    As Eddings itself makes clear, it is well within the
    sentencer’s power to “determine the weight to be given
    relevant mitigating evidence.” 455 U.S. at 114–15. Here,
    Judge Kelly considered Mann’s argument that the accident
    led to a fundamental change in his personality that set him on
    a path towards murder and found it unconvincing. This
    conclusion was entirely within the court’s power. As such,
    there is no indication that Judge Kelly excluded evidence that
    would have led to a reasonable probability of a different
    sentence in violation of clearly established federal law, and
    Eddings cannot provide a back door to de novo review.
    34                      MANN V. RYAN
    iii. Re-weighing old and new evidence
    Finally, Mann argues that the state court erred in failing
    to reweigh the old and new mitigation evidence against the
    existing aggravation evidence during post-conviction
    proceedings. Courts considering additional evidence in post-
    conviction proceedings must “evaluate the totality of the
    available mitigation evidence—both that adduced at trial, and
    the evidence adduced in the habeas proceeding in reweighing
    it against the evidence in aggravation.” Williams, 
    529 U.S. at
    397–98.
    There is no indication that the state court did not fulfill
    this duty here. The court did not explicitly state that it had
    reweighed the evidence, but that is not the standard. Instead,
    “[i]t is sufficient that a sentencing court state that it found no
    mitigating circumstances that outweigh the aggravating
    circumstances.” Ortiz v. Stewart, 
    149 F.3d 923
    , 943 (9th Cir.
    1998) (quoting Poland v. Stewart, 
    117 F.3d 1094
    , 1101 (9th
    Cir. 1997)). In this case, it was enough that the court found
    that the additional mitigation evidence Mann provided at the
    post-conviction proceedings was cumulative, not credible, or
    would otherwise have had no effect on the sentencing
    decision.
    The dissent’s attempt to fold Mann’s claim of Eddings
    error into his claim that the state post-conviction court failed
    to properly re-weigh the evidence does not change this
    conclusion. As discussed above, the state court reasonably
    concluded that the additional evidence about Mann’s 1985 car
    accident did not cause a fundamental change in his
    personality or set him on the path that led to Alberts’ and
    Bazurto’s murders, and therefore gave the new evidence little
    to no weight in mitigation. Therefore, it was not contrary to,
    MANN V. RYAN                           35
    and did not involve an unreasonable application of, federal
    law for the court to conclude that Mann had failed to show
    that the mitigating circumstances he had presented before the
    sentencing and post-conviction courts outweighed the
    aggravating circumstances of his crimes.
    B. Reasonableness of state court’s prejudice finding
    Even though Mann has not demonstrated that the state
    post-conviction court’s opinion should be subject to de novo
    review, he could still secure habeas relief under AEDPA if he
    could demonstrate that it was “unreasonable” for the state
    court to conclude that Mann was not prejudiced by his
    counsel’s alleged failings. See Richter, 
    562 U.S. at 101
    . A
    court ruling is unreasonable if it is “so lacking in justification
    that there was an error well understood and comprehended in
    existing law beyond any possibility for fairminded
    disagreement.” 
    Id. at 103
    .
    Under Strickland’s prejudice prong, the petitioner seeking
    habeas relief must show that there is a “reasonable probability
    that, but for counsel’s unprofessional errors, the result of the
    proceeding would have been different.” 
    466 U.S. at 694
    . “A
    reasonable probability is a probability sufficient to undermine
    confidence in the outcome.” 
    Id.
     It is conceivable that the
    evidence that emerged in the state post-conviction
    proceedings might have changed Mann’s profile somewhat
    had Mann’s attorney presented it at sentencing. For example,
    Mann notes that while the state sentencing court concluded
    that he was “incapable of remorse,” evidence was presented
    to the state post-conviction court that supported the
    contention that he had in fact been deeply affected by the
    1985 car accident in which two people died. Mann also notes
    that Dr. Flynn’s damning suggestion that he might be a
    36                     MANN V. RYAN
    psychopath failed to account for the possibility of a traumatic
    brain injury, and that further testing would have revealed that
    the injury significantly changed his personality, effectively
    turning a significant aggravating factor into a significant
    mitigating factor.
    But, as noted above, even if the accident had an effect on
    Mann’s personality, it hardly changed an altar boy into a
    callous criminal. The presentence report submitted by the
    probation department attached a long criminal history record
    that included 14 offenses predating Mann’s 1985 car
    accident. While Mann’s earliest crimes were minor, they
    escalated over time. In 1980, Mann was sentenced to
    probation for third-degree burglary. In 1982, he was arrested
    after pointing a gun at the victim of an attempted car theft, at
    which point his probation for the burglary offense was
    revoked and he was sentenced to two years in prison. The
    presentence report also noted that Mann stole to support his
    family starting around age 15. Mann himself acknowledges
    that his pre-accident record was “troubling” and that the
    sentencing court had already been presented with “credible
    and potent mitigation” that it found outweighed by the
    heinous nature of Mann’s crime.
    Given this history, it was not unreasonable for the state
    post-conviction court to conclude that the accident had no
    significant effect on Mann’s behavior. He had set on a path
    of violent crime long before the accident occurred. Nor was
    it unreasonable for the court to conclude that additional
    evidence of Mann’s good character was not enough to
    outweigh the various aggravating factors that the sentencing
    court had found: (1) the crime was committed for pecuniary
    gain, (2) there were two victims, and (3) Bazurto’s murder
    was committed “in an especially heinous, cruel or depraved
    MANN V. RYAN                               37
    manner.”     Indeed, the aggravating factors remained
    unaffected by the new mitigating evidence.4 And, while the
    new evidence did suggest that Mann had been remorseful
    about the car accident, it did not undermine the sentencing
    court’s conclusion that Mann had shown no remorse for the
    cold-blooded murders of which he had been convicted. We
    cannot conclude that it was unreasonable for the state post-
    conviction court to find that the new evidence as to Mann’s
    capacity for remorse and the 1985 car accident did not
    “undermine confidence in the outcome” of the sentencing.
    See Strickland, 
    466 U.S. at 694
    .
    V. Conclusion
    The judgment of the district court denying habeas relief
    as to both Mann’s convictions and his sentence is affirmed.
    AFFIRMED.
    4
    Mann argues that Miller “admitted during the PCR proceedings[] that
    neither victim suffered and that they died or became unconscious almost
    simultaneous with the shootings.” Had she said this, it could have
    undermined the sentencing court’s conclusion that Bazurto’s murder was
    especially cruel, heinous, or depraved. However, Miller actually said at
    the post-conviction hearing that she didn’t know whether Bazurto’s
    movements after he was shot were voluntary or involuntary, that it was
    “possible” that Mann had not accurately described the last moments of
    Bazurto’s life to her, and that it was “possible” that he had been
    unconscious even though she believed him to have been awake and
    struggling. To the extent that her testimony before the post-conviction
    court was different from her testimony at trial, the post-conviction court
    “discount[ed] it and continue[d] to believe the evidence she provided at
    trial.” As noted above, we defer to the reasonable credibility
    determinations made by the state post-conviction court. Lonberger, 
    459 U.S. at 434
    .
    38                      MANN V. RYAN
    THOMAS, Chief Judge, concurring in part and dissenting in
    part:
    I agree with the majority that Mann is not entitled to relief
    on his claims of guilt-phase ineffective assistance of counsel.
    I respectfully disagree that he is not entitled to relief on his
    claim of ineffective assistance of counsel at sentencing.
    Therefore, I concur in part and dissent in part.
    I
    Before venturing into the dense thicket of AEDPA
    nuances, we must recognize at the onset that, although the
    law may not provide a remedy, Mann was sentenced to death
    under an unconstitutional sentencing scheme.
    First, his death sentence was imposed by a judge, not a
    jury, under a system that the Supreme Court later declared
    unconstitutional as a violation of the Sixth Amendment right
    to trial by jury. Ring v. Arizona, 
    536 U.S. 584
    , 609 (2002).
    Mann, of course, has no remedy for that constitutional
    infirmity because Ring does not apply retroactively. Schriro
    v. Summerlin, 
    542 U.S. 348
    , 358 (2004).
    Second, he was sentenced during a period in which
    Arizona unconstitutionally precluded the consideration of
    mitigating evidence that lacked a “causal nexus” to the
    crime, in irreconcilable conflict with controlling Supreme
    Court Eighth Amendment jurisprudence as decided in
    Eddings v. Oklahoma, 
    455 U.S. 104
     (1982). McKinney v.
    Ryan, 
    813 F.3d 798
    , 802 (9th Cir. 2015) (en banc). However,
    because neither Mann’s trial nor Mann’s post-conviction
    counsel raised this Eighth Amendment claim before the state
    MANN V. RYAN                               39
    court, we are precluded from granting Mann direct relief on
    a meritorious constitutional claim.
    Yet one more constitutional error infected Mann’s
    sentencing: ineffective assistance of counsel. Mann’s
    attorney did not investigate or present available and
    significant mitigating evidence to the sentencing judge. The
    majority does not seriously contest this constitutional error,
    but concludes that AEDPA deference prevents us from
    reaching the merits of that claim ourselves. I respectfully
    disagree that AEDPA precludes meaningful habeas review.
    I would reach the merits and grant relief.
    II
    The state post-conviction court was required to assess
    Mann’s ineffective assistance of counsel claim under
    Strickland v. Washington, which held that a criminal
    defendant’s Sixth Amendment right to counsel is violated if
    the defendant’s trial attorney performs deficiently and thereby
    prejudices the defendant. 
    466 U.S. 668
    , 687 (1984).
    However, the post-conviction court committed constitutional
    error in its consideration of the ineffective assistance of
    counsel claim in two respects: (1) it unconstitutionally
    applied a “causal nexus” test for consideration of mitigating
    evidence in violation of Eddings, and (2) it applied a “more
    likely than not” standard rather than the constitutionally
    required “reasonable probability” test in its assessment of
    prejudice in violation of Strickland.1 The post-conviction
    1
    Mann exhausted his Strickland claim by presenting it to the state post-
    conviction court and Arizona Supreme Court. The Arizona Supreme
    Court effectively adopted the post-conviction court’s flawed Strickland
    analysis by summarily denying Mann’s petition for review. Ylst v.
    40                         MANN V. RYAN
    court’s analysis of the Strickland claim in its decision was
    thus contrary to clearly established federal law as determined
    by the Supreme Court. Therefore, its decision is not entitled
    to AEDPA deference, and we should analyze the ineffective
    assistance claim de novo on the merits.
    A
    Strickland requires a state post-conviction court to
    “evaluate the totality of the available mitigation
    evidence—both that adduced at trial, and the evidence
    adduced in the habeas proceeding”—and reweigh it against
    the aggravating evidence to determine whether counsel’s
    deficiency prejudiced the defendant. Williams v. Taylor, 
    529 U.S. 362
    , 397–99 (2000) (emphasis added).
    Sentencers and reviewing courts may determine what
    weight to accord mitigating evidence, but “may not give
    [mitigating evidence] no weight by excluding such evidence
    Nunnemaker, 
    501 U.S. 797
    , 803 (1991) (“Where there has been one
    reasoned state judgment rejecting a federal claim, later unexplained orders
    upholding that judgment or rejecting the same claim rest upon the same
    ground.”). Mann was not required to exhaust his arguments regarding the
    standard of review this Court should apply to that Strickland claim.
    Indeed, Mann lacked “the right under the law of [Arizona] to raise” the
    question of the appropriate federal standard of review under AEDPA, as
    such an inquiry is only relevant in a federal habeas proceeding. See 
    28 U.S.C. § 2254
    (c) (requiring exhaustion of claims that can be adjudicated
    in the state court). Thus, because Mann properly exhausted his Strickland
    claim, we must assess whether the state court’s Strickland analysis was
    contrary to federal law and thereby determine whether to apply AEDPA
    deference to our review of Mann’s Strickland claim. See Williams v.
    Taylor, 
    529 U.S. 362
    , 397 (2000) (concluding that state court analysis was
    “unreasonable application of” Strickland based on embedded legal error
    that was neither raised nor briefed in the state court).
    MANN V. RYAN                         41
    from their consideration.” Eddings, 
    455 U.S. at
    114–15.
    Rather, it is “[h]ighly relevant—if not essential—[to the]
    selection of an appropriate sentence” that the sentencer
    consider “the fullest information possible concerning the
    defendant’s life and characteristics.” Lockett v. Ohio, 
    438 U.S. 586
    , 602–03 (1978) (alterations in original) (quoting
    Williams v. New York, 
    337 U.S. 241
    , 247 (1949)).
    Accordingly, courts cannot require a capital defendant to
    “establish a nexus between [mitigating evidence] and [the]
    crime.” Tennard v. Dretke, 
    542 U.S. 274
    , 287 (2004).
    Yet, we know that throughout Mann’s trial, sentencing,
    direct appeal, and post-conviction proceeding, Arizona courts
    “articulated and applied a ‘causal nexus’ test,” contrary to
    Eddings, “that forbade as a matter of law giving weight to
    mitigating evidence, such as . . . mental condition, unless the
    . . . mental condition was causally connected to the crime.”
    McKinney, 813 F.3d at 802–03 (concluding that Arizona
    courts applied a “causal nexus” test contrary to clearly
    established federal law from 1989 until approximately 2005).
    It was not until the Supreme Court held in Tennard that a
    similar Fifth Circuit test had “no basis in [Supreme Court]
    precedents and . . . [was] inconsistent with the standard [the
    Court] adopted for relevance in the capital sentencing
    context” that Arizona’s practice changed. 542 U.S. at 287.
    Shortly after Tennard, the Arizona Supreme Court
    recognized and applied a new rule eliminating the causal
    nexus requirement in State v. Anderson, 
    111 P.3d 369
    , 391
    (Ariz. 2005). But during the period relevant to this case,
    Arizona post-conviction courts were applying the
    unconstitutional causal nexus test, and were thus unable to
    properly “reweigh” the totality of available mitigating and
    aggravating evidence as required by Strickland.
    42                     MANN V. RYAN
    In this case, the post-conviction court applied a causal
    nexus test in violation of Eddings. First, we know that the
    post-conviction court was required to do so by state law, as
    the Arizona Supreme Court consistently articulated and
    applied a causal nexus test both before and after Mann’s post-
    conviction proceeding. McKinney, 813 F.3d at 803. Just as
    federal courts must presume that state courts “know and
    follow” federal law, Woodford v. Visciotti, 
    537 U.S. 19
    , 24
    (2002) (per curiam), perhaps even more so, federal courts
    cannot “presume . . . lightly that a state court failed to apply
    its own law,” here, an unconstitutional causal nexus test, Bell
    v. Cone, 
    543 U.S. 447
    , 455 (2005) (per curiam) (emphasis
    added). I cannot presume, nor do I believe, that the post-
    conviction judge would act contrary to controlling Arizona
    precedent.
    Second, the record shows that the post-conviction court
    actually applied the causal nexus test to Mann’s mitigating
    evidence. Indeed, the Court said so, stating “[t]he Court finds
    that Defendant has not proven the existence of a causal
    connection between the accident and its effects and the
    murders.” Moreover, the post-conviction court and the State
    emphasized the causal nexus test throughout Mann’s post-
    conviction proceeding. When clinical neuropsychologist Dr.
    James F. Comer testified about the results of Mann’s
    neuropsychological evaluation, the judge asked Dr. Comer to
    clarify whether Mann’s head injury could have affected the
    crime. Dr. Comer responded by stating that he was “making
    no direct, causal connection” between Mann’s organic brain
    damage and the murders because that was “something . . . the
    court need[ed] to determine”—a response that suggests he
    understood the court’s question to be legal, not factual. The
    State emphasized that colloquy in its oral argument at the
    close of evidence, noting that the “court specifically asked
    MANN V. RYAN                         43
    Dr. Comer the critical legal issue, whether there’s any nexus
    between any possible injury to the brain from that accident
    and to the crime.” Indeed, when discussing Dr. Comer’s
    findings, the State’s post-conviction hearing memo cited
    State v. Hoskins, 
    14 P.3d 997
     (Ariz. 2000), a case—as
    recognized by the majority—in which the Arizona Supreme
    Court “articulated and insisted on its unconstitutional causal
    nexus test.” McKinney, 813 F.3d at 814–15.
    The post-conviction court’s written decision then directly
    responded to its own questioning of Dr. Comer and the
    State’s invocation of the causal nexus test. The decision first
    addressed Mann’s state law claim for resentencing, which
    could only be granted if “[n]ewly discovered material facts
    . . . probably would have changed the verdict or sentence.”
    Ariz. R. Crim. Pro. 32.1(e). Then, as previously noted, the
    post-conviction court concluded that Mann had “not proven
    the existence of a causal connection between the accident and
    its effects and the murders.” Rather, Mann had “committed
    the[] murders for pecuniary gain, not for reasons traceable to
    his 1985 accident.” The post-conviction court thus concluded
    that Mann could not establish that any new evidence probably
    would have changed his sentence, as required for relief
    pursuant to Arizona Rule of Criminal Procedure 32.1(e). The
    post-conviction court’s cursory ineffective assistance of
    counsel analysis then imported the reasoning from that state
    law resentencing analysis. The court concluded that Mann
    was not prejudiced by his counsel’s failure to introduce
    evidence of the accident and Mann’s attendant organic brain
    damage because “[a]dditional evidence that pertain[ed] to the
    1985 accident and its effects [was] discussed . . . above,
    where th[e] Court found that it would not have changed the
    sentence imposed.” That “discuss[ion] . . . above” turned
    44                          MANN V. RYAN
    almost exclusively on the lack of “a causal connection
    between the accident and its effects and the murders.”
    The post-conviction court did not use the phrase “causal
    connection” to respond to “the core” of Mann’s claims, as the
    majority suggests. Mann did not argue that evidence relating
    to the 1985 accident was relevant solely as a potential
    contributing factor to the crime. Rather, Mann explicitly
    argued at the post-conviction hearing that such evidence
    “would have provided some free-standing mitigation of
    itself.” Once the post-conviction court concluded that there
    was no causal connection, however, it did not consider and
    respond to this additional mitigation argument. The court
    failed to address how Mann’s organic brain damage and
    attendant personality change—apart from a causal nexus to
    the crime—could have otherwise reduced his moral
    culpability or altered his sentencing profile.
    Further, I cannot presume that the post-conviction court’s
    invocation of the phrase “causal connection” was divorced
    from the legal meaning given to that phrase by the Arizona
    Supreme Court.2 At the time of Mann’s post-conviction
    2
    The majority suggests that the post-conviction judge, who also
    presided over Mann’s trial, did not apply the causal nexus test during
    Mann’s trial and thus likely did not do so during Mann’s post-conviction
    proceeding. However, the appropriate standard of review under AEDPA
    turns on the legal analysis of the court that adjudicated the claim at issue,
    not analyses in prior and distinct proceedings. Moreover, during the
    sentencing phase of Mann’s trial, the prosecution repeatedly invoked the
    causal nexus test, arguing that unless a mitigating factor “ha[d] a direct
    causal tie” to the crime, the court did not “have to consider it.” Although
    brief, the trial court’s sentencing memorandum suggests that it agreed with
    the prosecution and, in accord with binding Arizona precedent, applied the
    causal nexus test to Mann’s non-statutory mitigating evidence. Thus,
    consideration of the trial court record suggests that the post-conviction
    MANN V. RYAN                               45
    proceeding, the term “causal connection” was a legal term of
    art, inextricably intertwined with the Arizona Supreme
    Court’s unconstitutional causal nexus test. See e.g., State v.
    Martinez, 
    999 P.2d 795
    , 808 (Ariz. 2000) (“[T]here was
    simply no causal connection between [the defendant’s]
    personality disorder and his actions on [the day of the
    murder].” (emphasis added)); State v. Sharp, 
    973 P.2d 1171
    ,
    1182 (Ariz. 1999) (“Appellant failed to show a causal
    connection between [the mitigating evidence] and his actions
    on the night of the murder. We have previously explained
    that we require a causal connection to justify considering
    evidence of a defendant’s background as a mitigating
    circumstance.” (emphasis added)); State v. Rienhardt, 
    951 P.2d 454
    , 467 (Ariz. 1997) (“Since [the defendant] declined
    to present any evidence of a causal connection at his
    aggravation-mitigation hearing, we reject this mitigating
    factor.” (emphasis added)). The post-conviction court
    referenced the lack of “causal connection” because it was
    required to do so by state law, not to respond to “the core” of
    Mann’s claim. To suggest otherwise is to say that the court
    did not mean what it said.
    In sum, the post-conviction court excluded from its
    prejudice analysis as a matter of law mitigating evidence that,
    irrespective of its relationship to the crime, could have shed
    light on Mann’s moral culpability, contrary to clearly
    established federal law. See Eddings, 
    455 U.S. at 113
    .
    Therefore, its decision is not entitled to deference under
    AEDPA.
    judge was aware of, and had previously applied in Mann’s case, Arizona’s
    unconstitutional causal nexus test.
    46                     MANN V. RYAN
    B
    The post-conviction court’s prejudice analysis was also
    “contrary to” clearly established federal law because it
    applied the “more-likely-than-not” standard that Strickland
    rejected. 
    466 U.S. at
    693–94. No one disagrees that it is
    constitutional error to apply a “more-likely-than-not”
    standard in analyzing prejudice because Strickland rejected
    that approach and instead established a “reasonable
    probability” standard. Specifically, Strickland held that to
    establish prejudice at the penalty phase of a capital
    proceeding, the petitioner must show that “there is a
    reasonable probability that, absent [counsel’s] errors, the
    sentencer . . . would have concluded that the balance of
    aggravating and mitigating circumstances did not warrant
    death.” 
    Id. at 695
    . The Court explicitly held that a
    “reasonable probability” is “a probability sufficient to
    undermine confidence in the outcome,” not a probability that
    it is “more likely than not” the result would be different. 
    Id.
    at 693–94.
    Here, the post-conviction court denied Mann’s ineffective
    assistance of counsel claim for the reasons “discussed” in its
    state law resentencing analysis, “where [the] [c]ourt found
    that [the new mitigating evidence] would not have changed
    the sentence imposed.” At the time of the post-conviction
    court’s decision, Arizona law limited resentencing to cases
    where “[n]ewly discovered material facts probably exist and
    such facts probably would have changed the verdict or
    sentence.” Ariz. R. Crim. P. 32.1(e) (2000). “Probably”
    effectively meant “more likely than not.” See State v.
    Orantez, 
    902 P.2d 824
    , 829 (Ariz. 1995) (concluding that new
    evidence “would have likely resulted in a different verdict”
    and thus “probably change[d] the verdict”). The post-
    MANN V. RYAN                          47
    conviction court’s ineffective assistance of counsel analysis
    did not invoke a different test for assessing prejudice. The
    most fair reading of the decision is therefore that the court
    denied constitutional relief for the same reason—and under
    the same procedural rules—that it denied state law relief: it
    probably would not “have changed the verdict or sentence
    imposed.” Although the majority may be correct that the
    difference between the “more-likely-than-not” and
    “reasonable probability” standards is outcome determinative
    “in the rarest case,” it is a difference that permits us to make
    that assessment de novo, rather than through AEDPA’s
    deferential lens.
    The fact that the post-conviction judge cited State v.
    Nash, 
    694 P.2d 222
     (Ariz. 1985), an Arizona case that
    adopted Strickland’s “reasonable probability” standard, does
    not alter this conclusion. The post-conviction court’s
    decision cites Nash only for the general idea that Strickland
    sets out the performance and prejudice test for Sixth
    Amendment claims, not to provide a specific prejudice
    standard distinct from the more-likely-than-not standard
    otherwise applicable under Arizona law and previously
    applied in the decision.
    And even if the citation to Nash meant that the post-
    conviction court implicitly adopted the correct prejudice
    standard, it is not enough to cite Strickland—a court’s
    analysis must reflect it too. The Supreme Court has held that
    even if a state court identifies the proper Strickland standard,
    by “failing to apply Strickland to assess the ineffective-
    assistance-of-counsel claim . . . raised, the state court’s
    adjudication [is] contrary to clearly established federal law.”
    Lafler v. Cooper, 
    132 S. Ct. 1376
    , 1390 (2012). Here, it is
    apparent that the post-conviction court did not actually “apply
    48                    MANN V. RYAN
    Strickland to assess” Mann’s claim and reweigh the
    aggravating and mitigating evidence.
    The only potential prejudice analysis is contained in the
    post-conviction court’s state law resentencing discussion,
    which primarily notes Mann’s pecuniary motive for the crime
    and the lack of a causal connection. However, both of those
    observations are irrelevant to a proper reweighing of
    aggravating and mitigating factors under Strickland—the
    post-conviction court merely restated an established
    aggravating factor and otherwise failed to respond to Mann’s
    contentions that the new evidence undermined the trial
    court’s rejection of the non-statutory mitigating factor of
    remorse. See 
    id.
     (concluding that Strickland analysis was
    “contrary to” clearly established law in part because the
    court’s analysis consisted of “irrelevant observation[s]”).
    The only potential prejudice analysis in the post-conviction
    court’s opinion therefore suggests that the court did not
    actually place the powerful new mitigating evidence in the
    context of evidence established at trial and reweigh the
    totality of available mitigating evidence against the evidence
    in aggravation. Williams, 
    529 U.S. at
    397–98.
    As a final note, the post-conviction court was not excused
    from its obligation to apply Strickland because the same
    judge presided over both Mann’s trial and post-conviction
    proceeding, and that judge concluded that the newly
    introduced evidence would not have changed his mind.
    Strickland’s prejudice analysis turns on a reasonable
    decisionmaker, not on the “idiosyncracies of [a] particular
    decisionmaker.” 
    466 U.S. at 695
    . Indeed, it would be odd to
    give weight to a single decisionmaker in this context, given
    that judge sentencing in capital cases is unconstitutional.
    Ring, 
    536 U.S. at 609
    .
    MANN V. RYAN                         49
    Additionally and significantly, in states like Arizona,
    where the state supreme court “conducts an independent
    review of the aggravating and mitigating factors, reweighing
    them afresh,” Correll v. Ryan, 
    539 F.3d 938
    , 951 (9th Cir.
    2008), the post-conviction court must assess whether there is
    a reasonable probability that “the sentencer—including an
    appellate court, to the extent it independently reweighs the
    evidence—would have concluded that the balance of
    aggravating and mitigating factors did not warrant death.”
    Strickland, 
    466 U.S. at 695
     (emphasis added). The fact that
    the post-conviction court spoke in terms of absolutes rather
    than degrees of probability thus provides additional evidence
    that the court failed to “apply Strickland to assess” prejudice
    by reweighing the evidence from the perspective of a neutral
    and reasonable sentencer.
    C
    In sum, the record demonstrates that the post-conviction
    court’s prejudice analysis was contrary to clearly established
    federal law in two respects. Because the state court’s
    decision is not entitled to AEDPA deference, I would review
    Mann’s Strickland claim de novo.
    III
    Reviewing the Strickland claim de novo, one can only
    conclude that Mann was denied his Sixth Amendment right
    to effective assistance of counsel and is entitled to habeas
    relief. As we know, to prevail on a claim for ineffective
    assistance of counsel, a defendant must first establish that
    “counsel’s performance was deficient” and, second, that the
    “deficient performance prejudiced the defense.” Strickland,
    
    466 U.S. at 687
    . Mann satisfies both of Strickland’s prongs.
    50                         MANN V. RYAN
    A
    Because the post-conviction court only reached
    Strickland’s prejudice prong, we must review Strickland’s
    deficiency prong de novo. Porter v. McCollum, 
    558 U.S. 30
    ,
    39 (2009) (per curiam).3 Reviewing that prong de novo, one
    can only conclude that counsel’s performance at sentencing
    was constitutionally deficient.
    Counsel’s performance is measured by “an objective
    standard of reasonableness,” as determined by “prevailing
    professional norms.” Strickland, 
    466 U.S. at
    687–88.
    Although there are no “specific guidelines” for measuring
    counsel’s performance, Cullen v. Pinholster, 
    563 U.S. 170
    ,
    195 (2011) (quoting Strickland, 
    466 U.S. at 688
    ), “general
    principles have emerged . . . that inform our view as to the
    ‘objective standard of reasonableness’ by which we assess
    attorney performance, particularly with respect to the duty to
    3
    The Supreme Court’s recent statement that “§ 2254(d) applies when a
    ‘claim,’ not a component of one, has been adjudicated” does not require
    a different analysis. Harrington v. Richter, 
    562 U.S. 86
    , 98 (2011). Here,
    unlike the summary denial in Richter, the court knows which component
    of Mann’s ineffective assistance of counsel claim—namely,
    prejudice—was addressed by the state court. This distinction between
    AEDPA review of summary denials and partial adjudications is apparent
    in post-Richter Supreme Court caselaw, which applies de novo review to
    unanalyzed portions of multi-prong tests. See, e.g., Brumfield v. Cain, 
    135 S. Ct. 2269
    , 2282–83 (2015) (applying de novo review to unanalyzed
    portion of Atkins claim). Indeed, in Brumfield, the Court analogized the
    partial adjudication at issue to Wiggins v. Smith, 
    539 U.S. 510
     (2003),
    where the state court’s reasoned decision was “premised solely” on one
    of Strickland’s prongs, and distinguished the case from Richter, where
    there was no “opinion explaining the reason relief [was] denied.” 
    135 S. Ct. at
    2282–83.
    MANN V. RYAN                         51
    investigate,” Summerlin v. Schriro, 
    427 F.3d 623
    , 629 (9th
    Cir. 2005) (en banc).
    Generally, for the penalty phase of capital proceedings,
    prevailing professional norms require counsel “to conduct a
    thorough investigation of the defendant’s background.”
    Williams, 
    529 U.S. at 396
    . As recognized in Strickland, the
    American Bar Association attorney standards serve as
    “guides” to determining what constitutes the requisite
    “thorough investigation.” 
    466 U.S. at
    688–90. At the time of
    Mann’s sentencing, those standards provided that counsel’s
    penalty phase investigation should “comprise efforts to
    discover all reasonably available mitigating evidence.” ABA
    Guidelines for the Appointment and Performance of Counsel
    in Death Penalty Cases 11.4.1(C) (1989).
    Specifically, because evidence of mental impairment may
    place a defendant’s character in context, thereby reducing a
    defendant’s moral culpability, capital defense attorneys have
    a “duty to investigate and present mitigating evidence of
    mental impairment.” Bean v. Calderon, 
    163 F.3d 1073
    , 1080
    (9th Cir. 1998). This standard practice was likewise reflected
    in the ABA guidelines at the time of Mann’s trial, which
    provided that capital defense attorneys should investigate the
    defendant’s “medical history.” ABA Guidelines for the
    Appointment and Performance of Counsel in Death Penalty
    Cases 11.4.1(D)(2)(C) (1989). Therefore, the “[f]ailure to
    investigate a defendant’s organic brain damage or other
    mental impairments may constitute ineffective assistance of
    counsel.” Caro v. Calderon (Caro I), 
    165 F.3d 1223
    , 1226
    (9th Cir. 1998).
    As measured against these prevailing professional norms,
    counsel’s penalty phase investigation fell below an objective
    52                    MANN V. RYAN
    standard of reasonableness. The majority does not suggest
    otherwise.
    Mann’s counsel never investigated the circumstances or
    consequences of the 1985 accident, and made no effort to
    investigate whether Mann sustained organic brain damage.
    The failure to do so is unsurprising given that Mann’s counsel
    admitted that he “was not focused on mitigation.” Indeed,
    counsel never even requested that a background investigation
    or any long term research be performed with regard to Mann.
    Counsel declined to pursue such avenues of mitigation relief
    despite the Capital Representation Project’s death penalty
    expert’s recommendation to investigate whether Mann had
    “organic brain damage” and had been “self-medicating with
    drugs.”
    Mann’s counsel also never attempted to obtain Mann’s
    medical records, whether relating to the 1985 accident or
    otherwise. Yet, obtaining “readily available documentary
    evidence such as . . . medical records” is “fundamental to
    preparing for virtually every capital sentencing proceeding.”
    Robinson v. Schriro, 
    595 F.3d 1086
    , 1108–09 (9th Cir. 2010).
    Mann’s counsel recognized as much, and requested a
    continuance to obtain “all the records” counsel could “from
    prior schooling, hospitalizations, [Mann’s] prior criminal
    record, and prior presentence reports.”
    Finally, Mann’s counsel did not to speak with Karen
    Miller, again, contrary to the recommendation of the Capital
    Representation Project. Counsel was aware, however, that
    Miller lived with Mann for ten years, including both before
    and after the 1985 accident; that she was someone who
    “care[d] about” Mann; and that she observed a change in
    Mann’s behavior during their relationship.          Counsel
    MANN V. RYAN                         53
    recognized the importance of their relationship and invoked
    it during his sentencing argument, noting that Mann “has tried
    to maintain some kind of a relationship with [Miller]” and
    that she “even went to the jail a couple times to visit” Mann.
    Counsel was thus aware that Miller “could have provided
    important background information” about Mann, “providing
    leads for further investigation,” likely regarding the 1985
    accident and its impact on Mann’s character. Robinson, 
    595 F.3d at 1110
    . Like other instances where counsel fails to
    “even take the first step of interviewing witnesses or
    requesting records,” counsel’s decision not to investigate the
    circumstances or consequences of the 1985 accident “did not
    reflect reasonable professional judgment” subject to this
    Court’s deference. Porter, 
    558 U.S. at
    39–40.
    If there could be any doubt that counsel’s actions fell
    below an objective standard of reasonableness, it is obviated
    by counsel’s concession at trial that such an investigation was
    the prevailing professional norm in the state of Arizona. See
    Wiggins v. Smith, 
    539 U.S. 510
    , 524 (2003) (concluding that
    counsel performed deficiently where counsel acknowledged
    the relevant professional norm); see also Pinholster, 
    563 U.S. at 196
     (distinguishing Wiggins as a case in which “the
    defendant’s trial counsel specifically acknowledged a
    standard practice for capital cases . . . that was inconsistent
    with what he had done”). When counsel requested a
    continuance, he told the court that a continuance was
    necessary so that counsel could fulfill his constitutional and
    state-law obligations to conduct a “comprehensive
    psychological profile and background investigation,” and
    obtain “all the records” available, including those from
    54                           MANN V. RYAN
    hospitalizations.4 Indeed, counsel conceded that the failure
    to conduct such an investigation would constitute “reversible
    error.” Yet, whether due to time constraints or “inattention,”
    counsel never conducted the very investigation he described
    to the court as required by law. See Wiggins, 
    539 U.S. at 526
    (concluding that counsel’s “failure to investigate thoroughly
    resulted from inattention, not reasoned strategic judgment”).
    In the post-conviction proceeding, counsel did not attempt
    to insulate his failure to investigate Mann’s medical history
    as a strategic decision. But, even if he had done so, cloaking
    a decision as “strategic” does eliminate counsel’s “duty to
    make reasonable investigations or to make a reasonable
    decision that makes particular investigations unnecessary.”
    Strickland, 
    466 U.S. at 691
    . It is often only after a
    preliminary investigation that “reasonably diligent counsel
    may draw a line [because] they have good reason to think
    further investigation would be a waste.” Rompilla v. Beard,
    
    545 U.S. 374
    , 382–83 (2005). After all, an “uninformed
    strategy is not a reasoned strategy. It is, in fact, no strategy
    at all.” Correll, 
    539 F.3d at 949
    .
    4
    Counsel requested a continuance because it was not until Mann was
    convicted that counsel “kind of realized . . . that it normally takes quite a
    few months to prepare a case for a sentencing.” This concession provides
    further evidence of counsel’s deficiency. “The failure to start the
    mitigation investigation until after the guilt phase flies directly in the face
    of the 1989 Guidelines, which directs an attorney to start preparing for
    sentencing as soon as he starts working on the case.” Jones v. Ryan, 
    583 F.3d 626
    , 644 (9th Cir. 2009), vacated for reconsideration in light of
    Pinholster, 
    563 U.S. 170
    , by 
    563 U.S. 932
     (2011); see ABA Guidelines
    for the Appointment and Performance of Counsel in Death Penalty Cases
    11.4.1(A) (1989) (stating that the penalty phase investigation should
    “begin immediately upon counsel’s entry into the case”).
    MANN V. RYAN                           55
    Here, counsel did conduct a narrow mitigation
    investigation. He spoke with members of Mann’s family to
    develop evidence of Mann’s “unstable and abusive family
    background” and “positive relationships with his daughters
    and mother.”        Counsel also requested a “neutral”
    psychological evaluation, provided by a person who was
    neither “defense [n]or State oriented.” However, “counsel’s
    duty to investigate all potentially mitigating evidence related
    to a defendant’s mental health [and] family background . . .
    is not discharged merely by conducting a limited
    investigation of [those] issues.” Lambright v. Shcriro, 
    490 F.3d 1103
    , 1120 (9th Cir. 2007) (en banc). Particularly
    where, like here, counsel “uncovered no evidence in [his]
    investigation to suggest that a mitigation case, in its own
    right, would have been counterproductive, or that further
    investigation would have been fruitless.” Wiggins, 
    539 U.S. at 525
    .
    Indeed, the failure to investigate Mann’s medical history
    could not be considered “strategic” in light of the mitigating
    evidence available to counsel. Mann’s biographical reference
    to the 1985 car accident and attendant concussion put counsel
    on notice of potential powerful mitigating evidence of organic
    brain damage, especially when coupled with the Capital
    Representation Project’s specific recommendation to
    investigate whether Mann suffered from brain damage. “In
    assessing the reasonableness of an attorney’s investigation . . .
    a court must consider not only the quantum of evidence
    already known to counsel, but also whether the known
    evidence would lead a reasonable attorney to investigate
    further.” 
    Id. at 527
    . Any reasonable attorney would further
    investigate whether a car accident that left two out of three
    passengers dead resulted in any permanent physical or
    psychological damage to Mann, the sole survivor.
    56                     MANN V. RYAN
    Counsel’s failure to investigate the 1985 accident and
    whether Mann suffered any organic brain damage was neither
    reasoned nor strategic; it was objectively unreasonable.
    Therefore, Mann’s counsel provided constitutionally deficient
    representation during the penalty phase of Mann’s trial.
    B
    Counsel’s failure to investigate and present mitigating
    evidence relating to the 1985 accident prejudiced Mann. If
    Mann’s counsel had conducted a reasonable investigation, the
    sentencing judge would have learned about Mann’s organic
    brain damage and ability to feel remorse, mitigators that
    could have affected the sentencer’s view of Mann’s moral
    culpability. Indeed, “[m]ore than any other singular factor,
    mental defects have been respected as a reason for leniency
    in our criminal justice system.” Caro v. Woodford (Caro II),
    
    280 F.3d 1247
    , 1258 (9th Cir. 2002) (citing 4 William
    Blackstone, Commentaries, *24–25). Given the impact that
    classic mitigating evidence would have had on Mann’s
    sentencing profile, the newly introduced evidence is more
    than “sufficient to undermine confidence” in Mann’s death
    sentence. Strickland, 
    466 U.S. at 694
    .
    To establish prejudice from counsel’s errors during the
    sentencing phase of a capital trial, the petitioner must show
    “a reasonable probability that, absent the errors, the sentencer
    . . . would have concluded that the balance of aggravating and
    mitigating circumstances did not warrant death.” 
    Id. at 695
    .
    This requires the court to “couple the omitted evidence with
    the mitigating evidence presented at trial,” and assess whether
    the omitted evidence might have influenced the sentencer’s
    assessment of the defendant’s moral culpability. Caro II, 
    280 F.3d at
    1256–57. Evidence of brain injury is a classic form
    MANN V. RYAN                         57
    of mitigating evidence and thus often alters the balance of
    aggravating and mitigating circumstances. Correll, 
    539 F.3d at 954
    .
    Here, there was substantial evidence of organic brain
    damage that was not presented to the sentencing judge.
    According to post-conviction testimony, Mann lost
    consciousness for a few hours after the accident. Once in the
    hospital, Mann’s doctors, which may have included up to five
    neurologists, expressed concern about Mann’s head injuries.
    After the accident, Mann experienced symptoms associated
    with organic brain damage, including astro-projection and
    severe lingering headaches.
    Mann’s post-conviction neurological expert, Dr. Comer,
    also concluded that Mann had “cognitive deficits consistent
    with head injury.” Dr. Comer effectively ruled out substance
    abuse as the cause of Mann’s cognitive deficits because the
    “cluster of weak test performances that [Mann] demonstrated
    tended to occur almost entirely on tests that had been well-
    documented to be sensitive to the subtle effects of head
    injury.” To further support that conclusion, both Mann and
    Miller presented evidence that it was only after the 1985
    accident that Mann began using and selling cocaine, a
    conclusion consistent with Mann’s presentence report. This
    compelling evidence suggests that Mann suffered organic
    brain damage in the accident, from which, according to Dr.
    Comer, he did not “successful[ly] recover[] emotionally and
    behaviorally.” The newly adduced mitigating evidence thus
    would have permitted the sentencer to more accurately assess
    Mann’s “character and record”—an “indispensable part of the
    process of inflicting the penalty of death.” Woodson v. North
    Carolina, 
    428 U.S. 280
    , 304 (1976) (plurality opinion).
    Indeed, it “is precisely the type [of mitigating evidence] most
    58                    MANN V. RYAN
    likely to affect a [sentencer’s] evaluation of the punishment”
    Mann should have received. Caro I, 165 F.3d at 1227.
    The mitigating evidence relating to the 1985 accident
    would have been of particular import in Mann’s case because
    Arizona courts “place significant weight on brain injuries as
    mitigating evidence.” Correll, 
    539 F.3d at
    950 n.3. Further,
    “a major personality change can amount to a mitigating factor
    in Arizona.” Smith v. Stewart, 
    140 F.3d 1263
    , 1271 (9th Cir.
    1998); see also State v. Rockwell, 
    775 P. 2d 1069
    , 1079 (Ariz.
    1989) (vacating death sentence in case where defendant’s
    “violent and unpredictable behavior began after [a] tragic
    [motorcycle] accident”). Thus, although counsel’s deficiency
    would be prejudicial in any case, it was particularly so here,
    where Mann’s capital sentence was automatically reviewed
    by the Arizona Supreme Court.
    Not only did evidence relating to the 1985 accident
    potentially reduce Mann’s moral culpability, but that
    evidence also undermined factual and legal findings made by
    the state trial court. The record developed in the post-
    conviction proceeding eradicated the two factual pillars upon
    which the sentencing court based its legal conclusion that
    Mann did not establish the non-statutory mitigating factor of
    remorse, thus per se altering the balance of aggravating and
    mitigating factors established at Mann’s trial.
    At sentencing, the trial court concluded that Mann failed
    to establish the non-statutory mitigating factor of remorse.
    The court specifically noted Mann’s description of the 1985
    accident contained in his biographical letter, and stated that
    in the letter Mann “indicate[d] no remorse” for the death of
    his two passengers. The court then concluded that Mann was
    MANN V. RYAN                         59
    “incapable of remorse.” That conclusion collapses in light of
    the post-conviction record.
    The post-conviction record demonstrates that Mann was
    capable of remorse and, indeed, expressed significant remorse
    following the 1985 accident. The medical records following
    the accident describe Mann as experiencing a “grief
    reaction.” Mann described himself as “devastated” by the
    death of his passengers, especially the younger girl, whom he
    considered “like a sister.” Miller said that Mann entered a
    depression after the accident, and that the death of his
    passengers “destroyed him.”          This evidence directly
    contradicts the sentencing court’s factual finding that Mann
    did not experience remorse for the death of his passengers
    following the 1985 accident.
    The court’s reliance on psychological testimony was
    similarly flawed because the psychologist was not provided
    evidence indicating that Mann may have received a head
    injury and therefore lacked “the information necessary to
    make an accurate evaluation” of Mann’s neuropsychological
    health. Caro I, 165 F.3d at 1226–27. The psychologist’s
    diagnosis of anti-social personality disorder required ruling
    out organic brain damage, which he was unable to do because
    he lacked the critical information. The psychologist’s
    opinion that Mann was an anti-social “psychopath” with “no
    conscience” was founded on a mistaken assumption of
    Mann’s neuropsychological health. Thus, the post-conviction
    record entirely undermines the basis of the sentencing court’s
    conclusion that Mann was “incapable of remorse,” and its
    rejection of remorse as a non-statutory mitigating factor.
    Therefore, there is no question that Mann was directly
    prejudiced by counsel’s failure to investigate and present
    60                     MANN V. RYAN
    evidence of organic brain injury and Mann’s actual remorse
    about the accident.
    In sum, the post-conviction evidence materially altered
    the sentencing profile that was presented to the sentencing
    judge and to the Arizona Supreme Court on direct review.
    The mitigating evidence introduced in the post-conviction
    proceeding was not “largely duplicat[ive]” of the mitigating
    evidence introduced at trial, or otherwise of “questionable
    mitigating value.” Pinholster, 
    563 U.S. at
    200–01. Rather,
    it was pure, undiluted mitigation, different in kind from the
    “lay background and character evidence” introduced at trial.
    Caro II, 
    280 F.3d at 1257
    . Thus, particularly in light of
    Arizona law at the time of Mann’s conviction, there is a
    reasonable probability that evidence relating to the 1985
    accident would have altered the balance of aggravating and
    mitigating factors and resulted in Mann receiving a sentence
    other than death. Counsel’s deficiency prejudiced Mann.
    IV
    For these reasons, I respectfully disagree that Mann is not
    entitled to relief on his claim of ineffective assistance of
    counsel at sentencing. Accordingly, I concur in part and
    dissent in part.
    MANN V. RYAN                         61
    CHRISTEN, Circuit Judge, joined by BERZON, Circuit
    Judge, concurring in part and dissenting in part:
    I agree with the majority and the dissent that petitioner
    did not meet his burden of establishing a meritorious guilt-
    phase claim. As for petitioner’s sentencing-phase claim, I
    fully join the dissent’s Part IIA analysis and conclude that
    Mann is entitled to de novo review on his claim of ineffective
    assistance of counsel. The dissent meticulously traces the
    post-conviction court’s treatment of Mann’s mitigating
    evidence and conclusively establishes that the court did
    indeed apply the rule from State v. Hoskins, 
    14 P.3d 997
    (Ariz. 2000) (en banc), a decision published by the Arizona
    Supreme Court less than a year before the court decided
    Mann’s post-conviction petition. Though this was exactly the
    course urged by the prosecution, it doomed the post-
    conviction court’s Strickland analysis because it
    unequivocally incorporated Eddings error. As the dissent
    makes plain, no speculation is required to conclude that the
    state court improperly weighed Mann’s mitigating evidence;
    the court said so. The dissent’s Part IIIA discussion of
    Strickland’s deficient performance prong is also compelling
    and I join it. But I ultimately conclude, as the majority does,
    that petitioner is not entitled to relief. In the end, I am not
    persuaded that petitioner met his burden of establishing that
    the errors he complains of prejudiced the outcome of his
    sentencing.
    

Document Info

Docket Number: 09-99017

Citation Numbers: 828 F.3d 1143

Filed Date: 7/15/2016

Precedential Status: Precedential

Modified Date: 1/12/2023

Authorities (47)

State v. Hoskins , 199 Ariz. 127 ( 2000 )

State v. Orantez , 183 Ariz. 218 ( 1995 )

State v. Nash , 143 Ariz. 392 ( 1985 )

State v. Rienhardt , 190 Ariz. 579 ( 1997 )

State v. Mann , 188 Ariz. 220 ( 1997 )

State v. Martinez , 196 Ariz. 451 ( 2000 )

Ouber v. Guarino , 293 F.3d 19 ( 2002 )

United States of America Ex Rel. Patrick Hampton v. Blair ... , 347 F.3d 219 ( 2003 )

98-cal-daily-op-serv-9096-98-daily-journal-dar-12770-anthony , 163 F.3d 1073 ( 1998 )

George Lopez v. Dora B. Schriro, Arizona Department of ... , 491 F.3d 1029 ( 2007 )

frank-g-mcaleese-at-no-92-1820-v-jf-mazurkiewicz-warden-attorney , 1 F.3d 159 ( 1993 )

State v. Sharp , 193 Ariz. 414 ( 1999 )

State v. Anderson , 210 Ariz. 327 ( 2005 )

State v. Rockwell , 161 Ariz. 5 ( 1989 )

Jones v. Ryan , 583 F.3d 626 ( 2009 )

Clarence Ray Allen v. Jeanne S. Woodford, Warden, of the ... , 395 F.3d 979 ( 2005 )

Fernando Eros Caro v. Jeanne Woodford, Warden , 280 F.3d 1247 ( 2002 )

Joe Leonard Lambright v. Dora B. Schriro, Director of ... , 490 F.3d 1103 ( 2007 )

Michael K. POLAND, Petitioner-Appellant, v. Terry STEWART, ... , 117 F.3d 1094 ( 1997 )

Donald Eugene Lambert v. James Blodgett, Donald Eugene ... , 393 F.3d 943 ( 2004 )

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