Dean Carter v. Kevin Chappell ( 2019 )


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  •                FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    DEAN PHILLIP CARTER,                  No. 13-99003
    Petitioner-Appellant,
    D.C. No.
    v.                  2:06-cv-04532-RGK
    RON DAVIS, Warden, San
    Quentin State Prison,
    Respondent-Appellee.
    Appeal from the United States District Court
    for the Central District of California
    R. Gary Klausner, District Judge, Presiding
    DEAN PHILLIP CARTER,                  No. 13-99007
    Petitioner-Appellant,
    D.C. No.
    v.                  3:06-cv-01343-BEN-
    KSC
    RON DAVIS, Warden, San
    Quentin State Prison,
    Respondent-Appellee.          OPINION
    Appeal from the United States District Court
    for the Southern District of California
    Roger T. Benitez, District Judge, Presiding
    2                         CARTER V. DAVIS
    Argued and Submitted March 28, 2019
    San Francisco, California
    Filed December 26, 2019
    Before: Johnnie B. Rawlinson, Richard R. Clifton,
    and Jay S. Bybee, Circuit Judges.
    Per Curiam Opinion
    SUMMARY*
    Habeas Corpus / Death Penalty
    In appeals arising from Dean Phillip Carter’s habeas
    corpus petitions challenging his convictions and death
    sentences in separate cases in Los Angeles and San Diego
    Counties, the panel (1) affirmed district court judgments in
    the Central and Southern Districts of California denying his
    petitions; (2) granted, as to one claim in the Central District,
    Carter’s supplemental motion to expand the certificate of
    appealability; and (3) otherwise denied the supplemental
    motion to expand the certificate of appealability.
    The Central District certified two claims for review:
    (1) that an irreconcilable conflict between Carter and trial
    counsel resulted in a denial of his Sixth Amendment rights,
    and (2) that trial counsel rendered ineffective assistance
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    CARTER V. DAVIS                          3
    because they refused to allow Carter to testify in his own
    defense.
    •   The panel held that even if Carter were able to
    demonstrate a complete breakdown in communication or
    prove that an irreconcilable conflict with trial counsel
    existed under this circuit’s precedent, his irreconcilable-
    conflict claim would fail because the U.S. Supreme Court
    has never held that an irreconcilable conflict with one’s
    attorney constitutes a per se denial of the right to effective
    counsel. The panel explained that this proves fatal to
    Carter’s claim because AEDPA conditions habeas relief
    on a determination that the state-court decision
    unreasonably applied “clearly established Federal law” as
    pronounced by the U.S. Supreme Court.
    •   The panel held that the California Supreme Court
    reasonably determined that counsel did not perform
    deficiently by refusing to let Carter testify, and that even
    if counsel performed deficiently by refusing to do so, the
    California Supreme Court’s determination that Carter
    cannot show prejudice was not an unreasonable
    application of law.
    The Southern District certified two claims for review:
    (1) that Carter’s trial counsel rendered ineffective assistance
    at the penalty phase, and (2) that Carter was deprived of his
    right to the competent assistance of a psychiatric expert.
    •   The panel held that Carter failed to establish that the
    California Supreme Court was unreasonable in denying
    relief on his contentions that counsel performed
    deficiently (a) by focusing on the positive aspects of
    Carter’s career and family life as a result, rather than
    4                     CARTER V. DAVIS
    giving greater emphasis to his traumatic childhood; and
    (b) by failing to conduct an adequate investigation into
    Carter’s mental health, including the possibility that he
    suffered from fetal alcohol syndrome.
    •   The panel held that Carter failed to establish that Ake v.
    Oklahoma, 
    470 U.S. 68
    (1985), or any other U.S.
    Supreme Court decision would cause jurists of reason to
    disagree with the reasonable arguments in support of the
    California Supreme Court’s denial of his claim that he
    was deprived of the right to competent assistance of a
    psychiatric expert at trial. The panel wrote that, as Carter
    conceded, the U.S. Supreme Court has never interpreted
    Ake to guarantee a due process right to effective expert
    assistance at trial.
    The panel issued a certificate of appealability on one
    claim, not certified by the Central District, alleging
    ineffective assistance of counsel at the penalty phase. The
    panel affirmed the denial of relief on that claim because the
    California Supreme Court’s determination that counsel
    satisfied the deferential standard set forth in Strickland v.
    Washington, 
    466 U.S. 668
    (1984), is not contrary to or an
    unreasonable application of federal law. The panel wrote that
    the California Supreme Court may reasonably have
    concluded that the investigation supporting counsel’s decision
    not to introduce more mitigating evidence was reasonable,
    and that even if Carter’s defense team performed deficiently,
    the California Supreme Court could reasonably have
    concluded that Carter was not prejudiced by their
    performance.
    CARTER V. DAVIS                        5
    The panel denied a certificate of appealability as to the
    rest of the claims not certified by the Southern and Central
    District Courts.
    COUNSEL
    Michael D. Weinstein (argued) and Mark Yim, Deputy
    Federal Public Defenders; Hilary Potashner, Federal Public
    Defender; Office of the Federal Public Defender, Los
    Angeles, California; for Petitioner-Appellant.
    Annie Featherman Fraser (argued), Deputy Attorney General;
    Holly D. Wilkens, Supervising Deputy Attorney General;
    Julie L. Garland, Senior Assistant Attorney General; Gerald
    A. Engler, Chief Assistant Attorney General; Xavier Becerra,
    Attorney General; Office of the Attorney General, San Diego,
    California; for Respondent-Appellee.
    OPINION
    PER CURIAM:
    In separate proceedings in Los Angeles and San Diego,
    Dean Phillip Carter (Carter) was convicted of murder, rape,
    robbery, and burglary and sentenced to death. Carter filed
    petitions for writs of habeas corpus in the United States
    District Courts for the Central District of California and for
    the Southern District of California. The district courts denied
    Carter’s petitions.
    6                          CARTER V. DAVIS
    In appeal No. 13-99003, we affirm the judgment of the
    Central District and deny Carter’s motion to expand the
    certificate of appealability (COA) as to all claims except
    claim 6, regarding ineffective assistance of counsel at the
    penalty phase.
    In appeal No. 13-99007, we affirm the judgment of the
    Southern District and deny Carter’s motion to expand the
    COA.
    I. BACKGROUND
    Carter stood trial in Los Angeles County and San Diego
    County for charges stemming from a crime spree throughout
    California in Spring 1984. In the Los Angeles proceedings,
    Carter was accused of the rape and murder of Bonnie Guthrie
    and the burglary of her residence; and of the murder of Susan
    Knoll, rape and murder of Jillette Mills, and the burglary of
    their shared residence. In San Diego County, Carter was
    accused of the murder and robbery of Janette Cullins and the
    burglary of her residence; and of the rape, forcible oral
    copulation, and robbery of B.S.1 and the burglary of her
    residence. In both the Los Angeles and San Diego
    proceedings, prosecutors also introduced evidence of Carter’s
    prior convictions for rape, robbery, and assault of J.S. in
    Ventura County, and of his connection to the murder of Tok
    Kim in Alameda County. The crimes occurred over four
    1
    We identify living victims of sex crimes only by their initials in this
    opinion.
    CARTER V. DAVIS                                7
    California counties over a period of about three weeks. We
    describe them briefly and chronologically.2
    A. The Crimes
    On March 25, 1984, Carter broke into the San Diego
    home of B.S. wielding a knife and demanded money. After
    taking B.S.’s cash, he raped her, hog-tied her, and stole her
    car.
    On March 27, Carter raped J.S. at knifepoint in her
    Ventura County apartment, cut her face, strangled her twice
    to the point at which she lost consciousness, and stole cash
    from her.3
    On April 1, Carter met Tok Kim at a bar in Lafayette,
    California, and offered to help her with car trouble. Over the
    next two days, a service station manager named David Hogan
    observed Carter and Kim at his station together. Hogan
    observed that Carter was wearing sunglasses and a black
    “Members Only” style jacket. On the night of April 10,
    Kim’s neighbor heard Kim arguing in her Oakland apartment
    with an unidentified man who was not her boyfriend. Kim’s
    co-workers notified her apartment manager after Kim did not
    appear for work on two consecutive days. On April 13, the
    2
    The facts set forth in this opinion are taken directly from the most
    recent reasoned state-court decisions issued in the challenged proceedings:
    People v. Carter, 
    117 P.3d 476
    (Cal. 2005) (Los Angeles) and People v.
    Carter, 
    117 P.3d 544
    (Cal. 2005) (San Diego).
    3
    A Ventura County jury convicted Carter of the rape, robbery, and
    assault of J.S. He does not seek relief from these convictions here.
    However, prosecutors introduced evidence of these convictions in both of
    Carter’s death penalty trials.
    8                        CARTER V. DAVIS
    apartment manager found Kim’s body on her bedroom floor.
    The pathologist who performed the autopsy could not
    determine the cause of death because of the body’s advanced
    stage of decomposition but testified that a curtain tie found
    beneath her neck could have been used to strangle her. 4
    On April 11, Culver City, California resident Susan Knoll
    went absent from her job at a bank. Knoll’s co-worker took
    a call from an unidentified man who informed her that Knoll
    had been in a traffic accident and was being treated for minor
    injuries at a hospital. The same day, after Knoll’s roommate
    Jillette Mills failed to respond to her brother’s attempts to
    contact her, the brother and a friend searched for Mills at her
    apartment, place of employment, and college but were unable
    to find Mills or her car. The two men then climbed a fence to
    enter Mills’s and Knoll’s unlocked apartment and found the
    bodies of both women stacked in the closet.
    Investigators discovered Kim’s vehicle outside of Mills’s
    and Knoll’s apartment. Inside the vehicle was a pair of
    sunglasses, which Hogan identified as matching a pair he
    observed Carter wearing at his station while with Kim.
    Mills’s white Datsun was missing. Inside the apartment,
    investigators retrieved a palm print matching Carter’s from
    the bathroom sink. An autopsy determined that Knoll died of
    manual strangulation and Mills died of ligature strangulation.
    Both women also suffered injuries consistent with having
    struggled against an assailant and had seminal fluid on their
    genital areas. Mills additionally suffered injuries to her
    genital area consistent with traumatic sexual assault.
    4
    Carter has never faced charges relating to Kim’s death. Prosecutors
    introduced evidence of the circumstances surrounding her death, however,
    in both of Carter’s death penalty trials.
    CARTER V. DAVIS                         9
    Also on April 11, the manager of Bonnie Guthrie’s
    apartment building in Los Angeles entered Guthrie’s
    apartment with a repairman. Guthrie was Knoll’s best friend.
    The manager observed Guthrie lying on her bedroom floor
    and remarked to the repairman that she was sleeping. The
    next day, the manager noticed Guthrie’s vehicle in the garage
    and wondered why she had not gone to work. He entered the
    apartment, observed Guthrie lying in the same position, and
    notified police. An autopsy determined that Guthrie died of
    ligature strangulation and that she had suffered injuries to her
    genital area consistent with traumatic sexual assault. Two
    days after the discovery of Guthrie’s body, a witness found
    Guthrie’s wallet in a San Diego shipyard, approximately fifty
    feet from a white Datsun matching the description of Mills’s
    missing vehicle.
    On April 12, Carter visited the San Diego apartment of
    Janette Cullins and her roommate Cheri Phinney. Carter and
    Cullins knew one another socially, and had met for drinks and
    dinner with other friends on two occasions in February and
    March 1984. On March 24, Carter had attempted to contact
    Cullins through her friend Cathleen Tiner. When Tiner told
    Cullins that Carter had called for her, Cullins became upset.
    Cullins had also told her former roommate, Nancy
    McEachern, that if Carter called for her she did not want to
    speak with him. When Carter visited Cullins on April 12,
    Cullins asked Phinney to come through the living room so
    that Carter would be aware that someone else was in the
    apartment. Carter left the apartment after an hour.
    That evening, Cullins and Tiner attended the symphony
    together. Cullins informed Tiner that Carter was back in
    town. At 11:00 p.m., Cullins left Tiner’s apartment and was
    never seen alive again. Between 11:15 and 11:30 p.m.,
    10                    CARTER V. DAVIS
    Cullins’s neighbor observed a white Datsun matching the
    description of Mills’s missing vehicle outside of Cullins’s
    apartment. The neighbor observed the vehicle drive away at
    11:30, nearly hitting another vehicle while making a U-turn
    and running through a stop sign.
    On April 13, Phinney and McEachern each attempted to
    contact Cullins without success. At midday, McEachern
    drove to Cullins’s apartment and encountered Carter, who
    was driving a white Datsun. Carter asked McEachern if
    Cullins was home. That evening, Carter unexpectedly visited
    Tiner at her home and commented that Cullins had “stood
    [him] up” that day. Tiner then unsuccessfully attempted to
    contact Cullins.
    The following day, Phinney and McEachern searched
    Cullins’s apartment and found her partially clothed body in
    her bedroom closet. A police investigation found damage to
    the front door consistent with a forced entry. An autopsy
    determined that Cullins died of ligature strangulation and that
    she had sustained a wound consistent with the use of a sharp
    knife either while she was dying or after she had died.
    On the same day Cullins’s body was discovered, a
    pedestrian found a wallet containing Cullins’s driver’s license
    and credit cards in bushes next to a sidewalk on North Harbor
    Drive in San Diego. The pedestrian testified that he had seen
    a white Datsun matching the description of Mills’s missing
    vehicle parked within one block of where he had found the
    wallet during the same week. Later that day, police recovered
    Guthrie’s purse from the same area of North Harbor Drive.
    On April 17, an Arizona Highway Patrol officer observed
    Mills’s white Datsun driving erratically on Interstate 40 in
    CARTER V. DAVIS                       11
    Yavapai County, Arizona. The officer initiated a traffic stop
    and discovered Carter alone in the vehicle with what
    appeared to be a burnt marijuana cigarette and placed Carter
    under arrest on suspicion of driving under the influence.
    While searching the vehicle for marijuana, the officer
    discovered Cullins’s bank identification card between the
    driver’s seat and center console.
    A full search of the vehicle recovered the following items:
    a suitcase, Korean-made wood-handled knife, yellow rubber
    gloves, and a gold chain, all belonging to Kim; a supermarket
    card belonging to Knoll; towels, athletic wear, and
    photographic equipment, all belonging to Mills; three hand-
    woven sweaters belonging to Guthrie; a key ring belonging to
    Cullins; a piece of paper with Cullins’s bank password
    written on it; and a black “Members Only” jacket matching
    the description of the jacket Hogan had seen Carter wearing
    while with Kim. The jacket contained a butcher knife, a
    knee-high nylon sock, and a business card from Hogan’s
    service station.
    Bank records revealed that all but $4.06 of Cullins’s bank
    account balance had been withdrawn from an ATM on April
    13, the day after she was last seen alive. A video of the
    transaction showed a man wearing one of Guthrie’s sweaters
    and a black jacket withdrawing the funds. A handwriting
    expert testified that there were “very strong indications” that
    Cullins had written the password on the slip of paper
    recovered from the Datsun but also could neither eliminate
    nor identify Carter as the writer.
    12                    CARTER V. DAVIS
    B. Criminal Proceedings
    1. Los Angeles County
    The Los Angeles trial regarding the crimes against Knoll,
    Mills, and Guthrie was bifurcated into guilt and penalty
    proceedings. At the guilt phase, Carter’s counsel rested
    without calling any witnesses or putting on a defense. Carter
    was convicted on all counts. At the penalty phase, Carter’s
    counsel presented an extensive mitigation case detailed
    below. Carter was sentenced to death.
    2. San Diego County
    The San Diego trial, which followed his conviction in Los
    Angeles County, was also bifurcated into guilt and penalty
    proceedings regarding the murder of Cullins and the rape of
    B.S. Carter stipulated before trial that he had been convicted
    of the murders of Knoll, Mills, and Guthrie.
    At the guilt phase, counsel put on a defense by calling
    several witnesses. But the jury found Carter guilty of the
    murder of Cullins, and found true the special circumstances
    that the murder was committed while lying in wait, during the
    commission of both a robbery and a burglary, and that Carter
    had previously been convicted of the murders of Knoll, Mills,
    and Guthrie. It further found Carter guilty of the robbery of
    Cullins and the burglary of her residence and found that he
    had inflicted great bodily injury during the course of these
    crimes. The jury also found Carter guilty of the forcible rape,
    forcible oral copulation, and robbery of B.S. and the burglary
    of her residence, and determined that Carter had used a
    deadly weapon (a knife) in the commission of each of his
    crimes against B.S.
    CARTER V. DAVIS                       13
    At the penalty phase, counsel presented a mitigation case
    similar to that presented in the Los Angeles trial. The jury
    returned a recommendation of the death penalty. The court
    imposed a death sentence.
    C. California Supreme Court Proceedings
    Carter’s convictions and sentences were appealed to the
    California Supreme Court. While those appeals were
    pending, Carter filed his first round of state habeas petitions
    in that court. In 2005, the California Supreme Court affirmed
    the convictions and death sentences in two separate, reasoned
    opinions. People v. Carter, 
    117 P.3d 476
    (Cal. 2005) (Los
    Angeles); People v. Carter, 
    117 P.3d 544
    (Cal. 2005) (San
    Diego). The court affirmed both judgments in their entirety
    with the exception of the San Diego court’s finding of the
    special circumstance of lying in wait on the Cullins murder
    charge, which it set aside. Carter sought review of these
    decisions in the Supreme Court of the United States, which
    denied his petitions for writ of certiorari in 2006. Carter v.
    California, 
    547 U.S. 1099
    (2006) (mem.) (Los Angeles);
    Carter v. California, 
    547 U.S. 1043
    (2006) (mem.) (San
    Diego).
    In 2006, the California Supreme Court summarily denied
    Carter’s habeas petitions on the merits. Carter filed two
    subsequent rounds of state habeas petitions in 2007 and 2010.
    The California Supreme Court summarily denied each of
    those petitions on the merits in 2010.
    D. Federal Habeas Proceedings
    Carter initiated the instant proceedings in 2007. In a
    petition for writ of habeas corpus filed in the United States
    14                    CARTER V. DAVIS
    District Court for the Southern District of California, he
    asserted seventeen claims for relief related to his San Diego
    County trial. Two days later, he filed a petition for writ of
    habeas corpus in the United States District Court for the
    Central District of California, asserting seventeen additional
    claims for relief related to his Los Angeles County trial.
    Carter filed amended petitions in both federal district courts
    in 2010, reducing the number of claims in his Southern
    District petition to sixteen.
    In 2013, the Central District of California published a
    146-page order dismissing two of Carter’s claims without
    prejudice and denying the rest of his claims on the merits.
    The district court granted a COA on two of Carter’s claims:
    that an irreconcilable conflict between Carter and trial
    counsel resulted in a denial of his Sixth Amendment rights
    (Certified Claim 1, and Claim 1 of the First Amended
    Petition); and that trial counsel rendered ineffective assistance
    because they refused to allow Carter to testify in his own
    defense (Certified Claim 2, and Claim 5(D) of the First
    Amended Petition). It denied a COA on the remaining
    claims.
    Later in 2013, the Southern District of California
    published a 318-page order denying all claims on the merits.
    The district court granted a COA on two claims: that trial
    counsel had rendered ineffective assistance during the penalty
    phase (Certified Claim 1, and Claim 3 of the Second
    Amended Petition); and that Carter was deprived of his right
    to the competent assistance of a psychiatric expert (Certified
    Claim 2, and Claim 4 of the Second Amended Petition). It
    denied a COA on the remaining claims. Carter filed a motion
    under Federal Rule of Civil Procedure 59(e) or 60(b) to
    vacate the order denying his petition and allow him to return
    CARTER V. DAVIS                         15
    to state court to further develop the evidentiary record. The
    Southern District denied this motion in a reasoned decision.
    Carter timely appealed both district court orders.
    II. STANDARD OF REVIEW
    “We review the district court[s’] denial of a habeas
    petition de novo.” Jones v. Harrington, 
    829 F.3d 1128
    , 1135
    (9th Cir. 2016). Carter’s habeas petitions are subject to the
    Antiterrorism and Effective Death Penalty Act of 1996
    (AEDPA), which forecloses federal habeas relief for “any
    claim that was adjudicated on the merits in State court”
    unless the state court’s decision was (1) “contrary to, or
    involved an unreasonable application of, clearly established
    Federal law, as determined by the Supreme Court of the
    United States”; or (2) “based on an unreasonable
    determination of the facts in light of the evidence presented
    in the State court proceeding.” 28 U.S.C. § 2254(d).
    These standards are “intentionally ‘difficult to meet.’”
    Woods v. Donald, 
    135 S. Ct. 1372
    , 1376 (2015) (per curiam)
    (quoting White v. Woodall, 
    572 U.S. 415
    , 419 (2014)).
    “‘[C]learly established Federal law’ for purposes of
    § 2254(d)(1) includes only ‘the holdings’” of Supreme Court
    decisions; it does not include Supreme Court dicta or circuit
    precedent. 
    Woodall, 572 U.S. at 419
    –20 & n.2; see Parker v.
    Matthews, 
    567 U.S. 37
    , 48–49 (2012) (per curiam). A state-
    court decision is “contrary to” clearly established Supreme
    Court precedent “if it ‘applies a rule that contradicts the
    governing law set forth in [the Supreme Court’s] cases’ or if
    it ‘confronts a set of facts that are materially indistinguishable
    from a decision of [the Supreme] Court and nevertheless
    arrives at a [different] result.’” Price v. Vincent, 
    538 U.S. 16
                        CARTER V. DAVIS
    634, 640 (2003) (quoting Williams v. Taylor, 
    529 U.S. 362
    ,
    405–06 (2000)). A state-court decision “involve[s] an
    unreasonable application” of clearly established Supreme
    Court precedent if “it correctly identifies the governing legal
    rule” but then applies that rule to the facts of a particular case
    in an “objectively unreasonable” way, such that the state
    court’s ruling rested on “an error well understood and
    comprehended in existing law beyond any possibility for
    fairminded disagreement.” 
    Woodall, 572 U.S. at 421
    , 426–27
    (citations omitted). Finally, a state-court decision is “based
    on an unreasonable determination of the facts” if “we are
    convinced that an appellate panel, applying the normal
    standards of appellate review, could not reasonably conclude
    that the finding is supported by the record.” Murray v.
    Schriro, 
    745 F.3d 984
    , 999 (9th Cir. 2014) (citation and
    internal alteration omitted).
    These deferential standards apply to each claim
    adjudicated on the merits in state court, regardless of whether
    the state court disposed of the claim in a reasoned opinion or
    a summary ruling. Harrington v. Richter, 
    562 U.S. 86
    , 99
    (2011). We generally “look to the last reasoned state court
    decision to address the claim” on the merits. White v. Ryan,
    
    895 F.3d 641
    , 665 (9th Cir. 2018) (citing Wilson v. Sellers,
    
    138 S. Ct. 1188
    , 1192 (2018)). If there is no reasoned state-
    court decision, we must “determine what arguments or
    theories . . . could have supported[] the state court’s
    decision.” 
    Richter, 562 U.S. at 102
    .
    Finally, even if a habeas petitioner satisfies one of the
    § 2254(d) prongs for relief, he must show that the claimed
    trial error “resulted in ‘actual prejudice.’” Davis v. Ayala,
    
    135 S. Ct. 2187
    , 2197 (2015) (quoting Brecht v. Abrahamson,
    
    507 U.S. 619
    , 637 (1993)). “Under this test, relief is proper
    CARTER V. DAVIS                       17
    only if the federal court has grave doubt about whether a trial
    error of federal law had substantial and injurious effect or
    influence in determining the jury’s verdict.” 
    Id. at 2197–98
    (internal quotation marks omitted).
    III. CERTIFIED CLAIMS
    We begin with the claims certified by the district courts.
    For three of the four claims, the “clearly established Federal
    law,” 28 U.S.C. § 2254(d)(1), is the Supreme Court’s
    decision in Strickland v. Washington, 
    466 U.S. 668
    (1984),
    which held that the Sixth Amendment guarantees a criminal
    defendant the “right to the effective assistance of counsel” at
    both the guilt and penalty phases of a capital trial. 
    Id. at 685–87.
    Under Strickland, a defendant claiming denial of
    effective assistance of counsel “bears the burden to meet two
    standards.” Weaver v. Massachusetts, 
    137 S. Ct. 1899
    , 1910
    (2017).
    First, the defendant “must show deficient
    performance—that the attorney’s error was ‘so serious that
    counsel was not functioning as the “counsel” guaranteed the
    defendant by the Sixth Amendment.’”             
    Id. (quoting Strickland,
    466 U.S. at 687). Under Strickland, our inquiry
    is highly deferential, and we “must apply a ‘strong
    presumption’ that counsel’s representation was within the
    ‘wide range’ of reasonable professional assistance.” 
    Richter, 562 U.S. at 104
    (quoting 
    Strickland, 466 U.S. at 689
    ). “To
    overcome that presumption, a defendant must show that
    counsel failed to act ‘reasonably considering all the
    circumstances.’” Cullen v. Pinholster, 
    563 U.S. 170
    , 189
    (2011) (alteration omitted) (quoting 
    Strickland, 466 U.S. at 688
    ). The relevant inquiry is “whether an attorney’s
    representation amounted to incompetence under ‘prevailing
    18                   CARTER V. DAVIS
    professional norms,’ not whether it deviated from best
    practices or most common custom.” 
    Richter, 562 U.S. at 105
    (quoting 
    Strickland, 466 U.S. at 690
    ). And given the
    “temp[tation] for a defendant to second-guess counsel’s
    assistance after conviction or adverse sentence,” the Supreme
    Court has strongly cautioned us against drawing the
    conclusion “that a particular act or omission of counsel was
    unreasonable” just because it “proved unsuccessful.”
    
    Strickland, 466 U.S. at 689
    .
    Second, the defendant must “demonstrate prejudice—‘a
    reasonable probability that, but for counsel’s unprofessional
    errors, the result of the proceeding would have been
    different.’” Buck v. Davis, 
    137 S. Ct. 759
    , 776 (2017)
    (quoting 
    Strickland, 466 U.S. at 694
    ). In the context of a
    death sentence, “[t]he question is whether there is a
    reasonable probability that, absent the errors, the sentencer
    would have concluded that the balance of aggravating and
    mitigating circumstances did not warrant death.” 
    Pinholster, 563 U.S. at 198
    (alteration omitted) (quoting 
    Strickland, 466 U.S. at 695
    ).
    “Surmounting Strickland’s high bar is never an easy
    task,” and “[e]stablishing that a state court’s application of
    Strickland was unreasonable under § 2254(d) is all the more
    difficult.” 
    Richter, 562 U.S. at 105
    (citations omitted). Our
    review under AEDPA is “doubly deferential,” as we must
    “afford ‘both the state court and the defense attorney the
    benefit of the doubt.’” 
    Donald, 135 S. Ct. at 1376
    (quoting
    Burt v. Titlow, 
    571 U.S. 12
    , 15 (2013)).
    CARTER V. DAVIS                        19
    A. Claims Certified by the Central District: Claims 1 and
    5(D)(1), Carter’s Conflict with Counsel
    The Central District issued a COA for two largely
    overlapping claims, which it addressed together. The
    certified claims effectively present two questions on appeal:
    whether the California Supreme Court’s decisions that
    (1) Carter was not denied his Sixth Amendment right to
    counsel because of an “irreconcilable conflict” with his trial
    counsel and (2) counsel’s performance in refusing to let
    Carter testify was not deficient, and even if it was, Carter was
    not prejudiced, were contrary to or an unreasonable
    application of clearly established federal law. For the reasons
    stated below, we hold that the California Supreme Court did
    not violate clearly established federal law in denying Carter
    relief.
    1. Carter’s Attorneys and the Marsden Hearings
    Ezekiel Perlo was initially appointed lead counsel and
    represented Carter, along with Marcia Morrisey, for over two
    years during 1986–1988. About a year prior to trial, in March
    1988, the court appointed Rowan Klein to assist Carter in his
    motion to substitute counsel, which under California law is
    referred to as a Marsden motion. See People v. Marsden,
    
    465 P.2d 44
    (Cal. 1970). The trial court held a Marsden
    hearing in which Klein notified the court that conflicts
    between Perlo and Carter had “led to a total breakdown of the
    attorney-client relationship” and that Carter wanted a new
    attorney to be appointed in place of Perlo. The trial court was
    troubled by this “easily made,” “blanket statement” that
    would further delay a trial already “long overdue.” It
    nevertheless agreed that the conflict between Perlo and Carter
    did not give it “much choice” but to grant the motion. The
    20                    CARTER V. DAVIS
    court appointed Howard Gillingham lead counsel a week
    later, and he and Morrissey represented Carter throughout the
    duration of the trial.
    a. July 5 (First Marsden Hearing)
    On July 5, 1989, just after the prosecution rested during
    the guilt phase, Gillingham requested an ex parte hearing to
    apprise the trial court of a disagreement between him and
    Carter. Gillingham invoked Marsden in requesting the
    hearing but did not say anything that would suggest Carter
    had requested new counsel. Gillingham stated he wanted to
    “spread something on the record regarding the defense
    strategy and position.” He informed the court that it was his
    and Morrissey’s “firm belief that [they] should rest” and not
    put on a defense at the guilt stage. He noted that there were
    a number of potential witnesses he could call but that they
    made the “tactical decision not to call those witnesses.” He
    did not mention Carter as one of those witnesses. Gillingham
    acknowledged Carter emphatically disagreed with the
    decision not to call any witnesses and that Carter wanted the
    disagreement preserved in the record. Gillingham argued that
    this was a situation where the appointed lawyers “should call
    the shots.” The trial court agreed, noting “the record is clear”
    and that “in these matters the decisions should be with the
    counsel.” Carter did not speak during the hearing and
    Gillingham subsequently testified that, based on his belief
    that the “lawyer ought to do the talking,” he had instructed
    Carter not to speak unless the court directly addressed him.
    b. July 10 (Second Marsden Hearing)
    Carter later testified that after the first Marsden hearing,
    he complained to Gillingham for leaving out “a couple of
    CARTER V. DAVIS                         21
    things,” including telling the court about his desire to testify,
    and for not “ma[king] it as clear as [Carter] would have
    liked.” Thus, on July 10, after both parties had rested but
    prior to closing arguments, Gillingham requested another
    hearing, which he noted “probably should be done in a sealed
    basis again under People versus Marsden.” The hearing was
    brief and Gillingham stated:
    Your honor, one further thing, in all modesty,
    I think I neglected to do it the other day, and,
    that is, in addition, by not putting on the
    witnesses, it also precluded the potential of
    Mr. Carter testifying based on . . . what those
    witnesses would have testified to and the
    effect of their testimony.
    The court responded: “You just wanted to add that?”
    Gillingham said he had nothing further and the court ordered
    the exchange sealed.
    That same day, after closing arguments, the court held
    another ex parte hearing, which did not appear to invoke
    Marsden. It was also very brief and Gillingham added:
    Your Honor, Mr. Carter asked me to spread
    upon the record that he does not agree with
    the closing argument that counsel made, that
    he had asked me what it was, and that he was
    not informed of the type of argument. And he
    certainly does not feel that it was adequate,
    and this just compounds the problem of the
    lack of defense by the argument that counsel
    made.
    22                   CARTER V. DAVIS
    The court responded by noting the “record is clear” and again
    sealed the record. Carter did not speak during either of these
    exchanges.
    c. July 17 (Third Marsden Hearing)
    On July 17, while the jury was deliberating, Gillingham
    again requested a hearing “under the ambit of Marsden.”
    Gillingham informed the court:
    Mr. Carter continues to express
    disappointment . . . [with] the manner in
    which to this point the case has been handled
    by counsel. He specifically would ask me to,
    as I understand it, ask you to appoint Mr.
    Rowen Klein . . . [to] prepare and file a new
    trial motion or some motion pre-penalty
    phase. This is part of the reason for the
    Marsden.
    I will say that counsel opposes that
    motion. . . . We have discussed Mr. Carter’s
    now constitutional rights under the ultimately
    famous case of Feretta. . . . He is not making
    that request today.
    The court denied the request as untimely and noted that while
    Klein may ultimately be able to help Carter file a motion for
    new trial, it was not the appropriate time to consider such a
    motion.
    CARTER V. DAVIS                      23
    d. September 5 (Fourth Marsden Hearing)
    On September 5, after the jury returned a death verdict
    but prior to sentencing, Gillingham once again requested an
    ex parte hearing under Marsden. The following colloquy
    took place:
    Gillingham: Your Honor, as you know,
    throughout the case there have been various
    instances where Mr. Carter’s feelings,
    opinions, et cetera, as to how the case was
    being run surfaced. That has happened again,
    and my own personal opinion, for what it’s
    worth, is, it’s probably well taken. We asked
    to be here under People versus Marsden, and
    it’s my impression and belief that Mr. Carter
    does not have confidence in the ability of
    Miss Morrissey to proceed with his defense.
    This is not a knee jerk reaction. We’ve
    discussed it.
    Court: So without your opinion on the merits
    of his displeasure, you feel there are righteous
    differences of opinion here?
    Gillingham: Yes, I do, your honor.
    Court: And possibly is. You would be unable
    ethically or intellectually to pursue the types
    of claims that Mr. Carter would be making on
    a motion for new trial and other issues?
    Gillingham: Absolutely, and I do feel
    strongly about it, that assuming new counsel
    24                    CARTER V. DAVIS
    were available, the most expeditious judicial
    and most fair way to proceed, Miss Morrissey
    and I should be relieved. That is Mr. Carter’s
    request, which I understand it is.
    ...
    Court: And Mr. Carter, is that your desire to
    have Mr. Klein appointed to represent you in
    this proceedings from now on?
    Carter: Yes, it is.
    Court:    And do you agree with Mr.
    Gillingham’s statement that there is a
    difference–
    Carter: Definitely.
    Court: I don’t really see I have much choice
    in this matter. At this point I don’t want to
    pry, and I certainly respect the tremendous
    amount, not only Mr. Gillingham and Miss
    Morrissey’s legal abilities, but their ethical
    standards as well, a[nd] if they feel that this is
    the correct thing to do, I certainly would
    agree.
    The trial court then appointed Klein to represent Carter on his
    motion for a new trial.
    CARTER V. DAVIS                        25
    e. Hearing on Motion for a New Trial
    Klein moved for a new trial based, in part, on the conflict
    between Gillingham and Carter. The court held a hearing on
    the motion and Gillingham was called to testify about his
    representation. Gillingham testified that he and Morrissey
    recognized it was a “potential death case” and that they had
    made the “tentative decision” to try it as a penalty case. He
    admitted that the cases pending in Oakland and San Diego
    “had to be some factor” in that decision. As an example of
    how this decision affected the trial strategy, Gillingham noted
    that “the voir dire of the jurors was almost entirely death
    focused.” Gillingham testified that Carter “wanted to put on
    at all times a full-blown defense” and “contest [] guilt” which
    included the “possibility” of Carter testifying. Gillingham
    observed that Carter’s comments were at times “framed in the
    negative,” such as: “Aren’t you going to do something?”;
    “Where are the witnesses?”; and “What are you going to do?”
    Gillingham further testified that in each of the hearings
    discussed above he had always intended to accurately convey
    Carter’s desires but that he likely did not do so very well.
    Carter also testified during the hearing on the motion for
    new trial. Carter said he told his attorneys he “wanted to
    present a defense” and that he “was more concerned about the
    guilt phase and that [he] felt it was necessary for [him] to
    testify.” They did not settle on a defense strategy before trial
    because Gillingham told him they could not fully plan their
    strategy until they saw the prosecution’s case. He said the
    first serious discussion with his counsel about the defense
    case, including him testifying, was the day before the
    prosecution rested. At that time, Gillingham told him that he
    was not planning on putting on a defense, and if they were
    not going to put on a defense, Carter would not testify. Carter
    26                    CARTER V. DAVIS
    was “upset,” and told Gillingham that he “wanted to call
    witnesses, put on a defense and testify.” Carter noted he had
    discussed trial strategy with Gillingham “around” ten times
    prior to trial.
    One time after voicing his disagreement to Gillingham,
    Carter stated that Gillingham responded by telling him, “[a]s
    hard as it is sometimes a lawyer has to play god.” Carter
    testified he was particularly upset that he would not be able
    to testify as a result of Gillingham’s decision not to call
    witnesses and that he had requested the Marsden hearings to
    “indicate to the court that I was not happy with what
    [Gillingham] was doing and I wanted to make sure it was
    clear that it was over my objection that he was doing it.” On
    cross-examination, Carter conceded that he had not thought
    about how his decision to testify could affect the other
    pending cases. And when asked whether Gillingham stated
    Carter’s view “completely and accurately,” Carter responded,
    “As far as I recall.”
    Klein argued that as soon as the court learned Carter
    wanted to testify, it was constitutionally obligated to seek a
    waiver of Carter’s right to testify. The court orally denied the
    motion for a new trial without expressing its reasoning.
    f. California Supreme Court Proceedings
    On direct appeal to the California Supreme Court, Carter
    argued the trial court erred by failing to adequately inquire
    into the conflict with his counsel and by failing to appoint
    new counsel once the conflict was disclosed. 
    Carter, 117 P.3d at 530
    . The California Supreme Court denied this
    claim on its merits. 
    Id. at 530–34.
    It rejected Carter’s claim
    CARTER V. DAVIS                       27
    that his conflict with Gillingham denied Carter his right to
    conflict-free, effective representation and held:
    Here, the record supports the People’s
    position that defendant, a person with a
    sophisticated view of the criminal justice
    system from the inside, complained
    sufficiently during proceedings conducted in
    the trial court so as to create a colorable
    appellate issue, but not sufficiently to obligate
    the trial court to relieve his counsel.
    
    Id. at 532–33
    (internal quotation marks omitted). The court
    agreed with the prosecutor who argued the motion for a new
    trial that “Mr. Carter was a defendant who wanted things his
    way. . . . Mr. Gillingham did not do them his way for valid
    legally sufficient reasons, and Mr. Gillingham indicated this
    . . . displeasure of Mr. Carter, but in the end, Mr. Carter
    acceded to Mr. Gillingham’s trial strategy.” 
    Id. at 533
    n.40
    (second alteration in original).
    The court also denied Carter’s claim that the trial court
    failed to sufficiently inquire into the conflict, concluding:
    [W]e are satisfied from the record before us
    that in the course of conducting three
    Marsden hearings, the trial court adequately
    inquired as to the issues raised by the defense,
    and that counsel fairly characterized the
    nature of the conflict for the trial court. . . .
    [D]efendant fails to persuade us that his
    conflict with defense counsel over trial tactics
    and strategy (including the decision whether
    28                     CARTER V. DAVIS
    defendant should testify), the trial court’s
    inquiries into that conflict, or the court’s
    refusal to appoint new counsel prior to the
    conclusion of the penalty phase, either
    singularly or in the aggregate, deprived
    defendant of his state or federal constitutional
    rights.
    
    Id. at 534.
    2. Irreconcilable Conflict
    In his federal habeas petition, Carter argued he was
    denied his constitutional right to “conflict-free, effective
    counsel” because of “an irreconcilable conflict with his court-
    appointed attorneys” and that the California Supreme Court’s
    opinion to the contrary was an “unreasonable application” of
    clearly established federal law and “based on an unreasonable
    determination of the facts.”
    The Sixth Amendment guarantees criminal defendants the
    right to effective assistance of counsel at all critical stages of
    the proceeding. Coleman v. Alabama, 
    399 U.S. 1
    , 7 (1970).
    It ensures defendants “an effective advocate,” but does not
    guarantee the defendant “will inexorably be represented by
    the lawyer whom he prefers.” Wheat v. United States,
    
    486 U.S. 153
    , 159 (1988).
    We have stated that “to compel one charged with [a]
    grievous crime to undergo a trial with the assistance of an
    attorney with whom he has become embroiled in
    irreconcilable conflict is to deprive him of the effective
    assistance of any counsel whatsoever.” Brown v. Craven,
    
    424 F.2d 1166
    , 1170 (9th Cir. 1970); see Stenson v. Lambert,
    CARTER V. DAVIS                              29
    
    504 F.3d 873
    , 886 (9th Cir. 2007). Concluding that such
    conflicts are tantamount to a denial of counsel altogether, we
    have held a defendant “need not show prejudice” as would
    ordinarily be required under a claim of ineffective assistance
    of counsel. United States v. Moore, 
    159 F.3d 1154
    , 1158 (9th
    Cir. 1998); see also 
    id. (“[I]f the
    relationship between lawyer
    and client completely collapses, the refusal to substitute new
    counsel violates [defendant’s] Sixth Amendment right to
    effective assistance of counsel.”). Carter argues that if he can
    establish an “irreconcilable conflict” existed between him and
    Gillingham under the three-step inquiry we set forth in
    Moore, he need not demonstrate the conflict prejudiced his
    defense. 
    See 159 F.3d at 1158
    –59.5
    Even under our circuit’s precedent, the conclusion that an
    irreconcilable conflict did not exist based on the disagreement
    between Carter and Gillingham was reasonable. 
    Carter, 117 P.3d at 533
    . “[O]nly where there is a complete
    breakdown in communication,” have we recognized an
    irreconcilable conflict claim. 
    Stenson, 504 F.3d at 886
    . At
    the hearing on the motion for a new trial, both Carter and
    Gillingham testified that they spoke many times before and
    throughout the trial about tactical decisions. The evidence
    simply does not demonstrate “a total lack of communication”
    between Carter and Gillingam. Schell v. Witek, 
    218 F.3d 1017
    , 1026 (9th Cir. 2000). Moreover, “[d]isagreements over
    strategical or tactical decision do not rise to level [sic] of a
    5
    We fashioned a three-part test in Moore to determine whether a
    conflict rises to the level of “irreconcilable.” See 
    Moore, 159 F.3d at 1158
    –59. Specifically, we consider “(1) the extent of the conflict; (2) the
    adequacy of the inquiry [by the trial court]; and (3) the timeliness of the
    motion [for substitution of counsel].” 
    Id. 30 CARTER
    V. DAVIS
    complete breakdown in communication.” 
    Stenson, 504 F.3d at 886
    (citing 
    Schell, 218 F.3d at 1026
    ).
    Even if Carter were successfully able to demonstrate a
    complete breakdown in communication or prove that an
    irreconcilable conflict existed under the Moore factors,
    Carter’s irreconcilable-conflict claim would still fail. This is
    because the Supreme Court has never endorsed this line of
    precedent from our court. It has never held that an
    irreconcilable conflict with one’s attorney constitutes a per se
    denial of the right to effective counsel. This proves fatal to
    Carter’s claim because AEDPA conditions habeas relief on a
    determination that the state-court decision unreasonably
    applied “clearly established Federal law” as pronounced by
    the U.S. Supreme Court. 28 U.S.C. § 2254(d)(1); 
    Williams, 529 U.S. at 365
    . Although we may look to our circuit’s
    precedent to see if we have already held a rule is clearly
    established, our decisions may not “be used to refine or
    sharpen a general principle of Supreme Court jurisprudence
    into a specific legal rule that [the] Court has not announced.”
    Marshall v. Rodgers, 
    569 U.S. 58
    , 64 (2013) (per curiam);
    see 
    Parker, 567 U.S. at 49
    (holding the Sixth Circuit erred in
    applying its circuit’s “multistep test” that bore scant
    resemblance to the general rules announced by the Supreme
    Court). Carter does not cite to any Supreme Court case
    holding that an irreconcilable conflict between a lawyer and
    his client constitutes a constructive denial of his right to
    counsel, with no showing of prejudice required. Nor has he
    pointed to Supreme Court precedent that resembles our test
    in Moore.
    CARTER V. DAVIS                        31
    The Supreme Court cases Carter cites are inapposite, as
    they all deal with conflicts of interest between other clients
    the counsel represented. See 
    Wheat, 486 U.S. at 163
    –64
    (holding in multiple-representation cases, a district court must
    help protect criminal defendants against counsel’s conflict of
    interest); Wood v. Georgia, 
    450 U.S. 261
    , 271–72 (1981)
    (discussing potential conflicts arising from counsel hired by
    defendants’ employer); Holloway v. Arkansas, 
    435 U.S. 475
    ,
    482 (1978) (holding joint representation of codefendants is
    not per se unconstitutional). The type of conflict Carter has
    alleged, however, is one over defense strategy. The term
    “conflict” can refer to different forms of conflict, and care
    must be taken not to mix them up. We have expressly
    declined to extend the conflict-of-interest analysis in Wheat,
    Wood, and Holloway to the type of conflict Carter alleges.
    We rejected arguments similar to Carter’s in another capital
    habeas case:
    [Petitioner’s] disagreement with [his counsel]
    is better characterized as one over trial
    strategy . . . . We can find no clearly
    established Supreme Court precedent holding
    that this kind of disagreement amounts to an
    actual conflict of interest. The Washington
    Supreme Court correctly determined that no
    clearly established federal law supports
    [Petitioner’s] construction of “conflict of
    interest” as describing a disagreement
    between attorney and client over trial strategy.
    32                       CARTER V. DAVIS
    
    Stenson, 504 F.3d at 886
    .6 We are “not aware” of any
    Supreme Court case suggesting the Sixth Amendment is
    violated because the defendant “dislike[s] or distrust[s]” his
    counsel. Plumlee v. Masto, 
    512 F.3d 1204
    , 1211 (9th Cir.
    2008); see also Larson v. Palmateer, 
    515 F.3d 1057
    , 1067
    (9th Cir. 2008).
    Carter similarly fails to cite to any Supreme Court
    precedent establishing that a trial court’s failure to inquire
    into the nature of the attorney-client relationship is a per se
    violation of a defendant’s Sixth Amendment rights. Carter
    admits that the Supreme Court cases he relies on “do not
    explicitly hold that a trial court must ask the defense attorney
    and defendant about a conflict” but contends that the
    “requirement is implicit in the holdings.” AEDPA requires
    more than pointing to implicit holdings or dicta; it requires
    that the law be clearly established. 
    Williams, 529 U.S. at 412
    .
    In arguing the California Supreme Court’s opinion
    contains an unreasonable determination of the facts, Carter
    mischaracterizes the opinion as holding there was no conflict
    between Carter and Gillingham. The court, however,
    recognized the conflict and accurately described it as
    6
    Admittedly, we relied on our own precedent in Stenson, as Carter
    urges this panel to do, but that decision was rendered before the Supreme
    Court’s more recent admonitions against relying on circuit precedent.
    That opinion involved a habeas petition in a capital case where the court
    held that an “irreconcilable conflict” with counsel was a constructive
    denial of the Sixth Amendment right to effective counsel. Significantly,
    our opinion in that case did not hold that the right to “conflict-free”
    counsel, as Carter uses that term, was clearly established by any Supreme
    Court case law. Rather, it simply analyzed the claim under the Moore test
    without citing any similar Supreme Court case. See 
    Stenson, 504 F.3d at 886
    –88.
    CARTER V. DAVIS                        33
    “dissatisfaction with counsel’s trial strategy and tactics.”
    
    Carter, 117 P.3d at 534
    .
    In sum, Carter’s attempt to avoid the Supreme Court’s
    established framework for ineffective-assistance-of-counsel
    claims by looking to this circuit’s articulation of the right to
    effective counsel is unavailing and we review Carter’s claim
    under Strickland, which is the clearly established federal law
    for claims alleging ineffective assistance of counsel, as
    determined by the Supreme Court. See Ayala v. Chappell,
    
    829 F.3d 1081
    , 1096 (9th Cir. 2016).
    3. Ineffective Assistance of Counsel by Refusing to Let
    Carter Testify
    a. Prior Rulings
    As described above, during the first Marsden hearing,
    Gillingham told the court he and Morrissey “firm[ly]
    belie[ved] that [they] should rest” and not put on a defense at
    the guilt stage. He explained they made the “tactical decision
    not to call [potential] witnesses,” despite Carter’s
    disagreement. The trial court agreed with Gillingham that “in
    these matters the decisions should be with the counsel.”
    During the second Marsden hearing, Gillingham clarified that
    “by not putting on the witnesses, it also precluded the
    potential of Mr. Carter testifying.”
    The California Supreme Court determined that Carter
    “had ample opportunity during the course of [these] Marsden
    hearings to inform the court that he wished to testify, against
    the advice and over the objection of defense counsel, even if
    defense counsel were permitted to decline to present any
    other defense witnesses who would support defendant’s own
    34                   CARTER V. DAVIS
    testimony,” but he did not. 
    Carter, 117 P.3d at 533
    (emphasis
    in original). The court reasoned that since Gillingham
    repeatedly informed the court of conflicts that arose with
    Carter, it could assume that if Carter “told his counsel that
    [he] insisted upon testifying despite the absence of any other
    defense witnesses, his counsel would have conveyed that
    demand to the trial court.” 
    Id. Since there
    was no such
    evidence, the court concluded that “on this record we may not
    assume that defendant in fact had insisted upon testifying
    even where no other defense witnesses would be presented to
    support his testimony.” 
    Id. at 533
    –34. “[I]n the end,” the
    court found, “Mr. Carter acceded to Mr. Gillingham’s trial
    strategy.” 
    Id. at 533
    n.40.
    The district court agreed that Carter never insisted on
    testifying even if no other defense witnesses would be
    presented. It found that: the California Supreme Court’s
    determination that Carter “acceded through his conduct to
    Gillingham’s trial strategy, as a factual matter, was not
    unreasonable” in light of the facts that “[a] defendant is
    ‘presumed to assent to his attorney’s tactical decision not to
    have him testify,’” United States v. Pino-Noriega, 
    189 F.3d 1089
    , 1094 (9th Cir. 1999) (quoting United States v. Joelson,
    
    7 F.3d 174
    , 177 (9th Cir. 1993)); Carter’s and Gillingham’s
    testimony that Carter wanted to put on a full-blown defense
    and testify after the presentation of defense witnesses was
    consistent; and Carter failed to move for new counsel when
    Gillingham intended to rest.
    b. Performance
    Carter argues that it was deficient performance not to
    allow him to testify because (1) doing so against Carter’s
    wishes conflicted with an objective standard of
    CARTER V. DAVIS                        35
    reasonableness under prevailing professional norms, and
    (2) Gillingham did not have an informed basis for making the
    decision, as he did not go over “in detail” what Carter’s
    testimony might be. We conclude the California Supreme
    Court reasonably determined that counsel did not perform
    deficiently. See 
    Carter, 117 P.3d at 526
    .
    As to professional norms, Carter argues that at the time of
    trial, the Supreme Court had established that a criminal
    defendant has a fundamental constitutional right to testify in
    his own defense, citing Rock v. Arkansas, 
    483 U.S. 44
    , 49, 51,
    53 (1987). But the California Supreme Court did not
    conclude that Carter lacked a right to testify in his own
    defense if he had asserted that right. Indeed, it expressly
    acknowledged that “[a]lthough tactical decisions at trial are
    generally counsel’s responsibility, the decision whether to
    testify, a question of fundamental importance, is made by the
    defendant after consultation with counsel.” 
    Carter, 117 P.3d at 533
    . Rather, the court concluded that although Carter
    repeatedly told counsel that he preferred to call witnesses
    (including himself) and present a defense case, he never
    insisted that he wanted to testify even if counsel made the
    tactical choice not to call witnesses—“in the end, Mr. Carter
    acceded to Mr. Gillingham’s trial strategy.” 
    Id. at 533
    &
    n.40. This was not an unreasonable determination of fact.
    Carter argues that it was, in part, because he was unable
    to speak during the Marsden hearings because Gillingham
    told him not to. He also complains that the court did not ask
    him about whether he wanted his attorneys to present a
    defense or to testify. However, the transcripts reveal that
    Carter at least felt comfortable talking to Gillingham during
    these hearings to urge him to add things to his presentations
    at these hearings. When the court asked Gillingham at the
    36                    CARTER V. DAVIS
    first Marsden hearing whether there was anything further,
    Gillingham initially replied there was not, but then said
    “[w]hoops, just a moment” while Carter told him about other
    possible witnesses, which Gillingham immediately relayed to
    the court.
    Moreover, Carter’s own descriptions of what he told
    Gillingham included both his desire to present a defense by
    calling other witnesses and his desire to testify himself: he
    “wanted to call witnesses, put on a defense and testify;” he
    “wanted them to subpoena the witnesses [he] wanted to call,
    and . . . to put on a defense; and [he] wanted to testify,” he
    was “unhappy” because he “wanted to present a defense and
    [he] wanted to testify.” Similarly, Carter stated he was
    dissatisfied with Gillingham’s presentation to the court in the
    first Marsden hearing because he thought Gillingham “left
    out a couple of things” by not “mention[ing] all the witnesses
    that [Carter] wanted to call, and he also didn’t tell the court
    that [Carter] wanted to testify on [his] own behalf.”
    Additionally, Carter conceded that as far as he could recall,
    Gillingham accurately conveyed his objections. This lends
    further support to the California Supreme Court’s finding that
    “Mr. Carter acceded to Mr. Gillingham’s trial strategy.” 
    Id. at 533
    n.40. And Carter points to no Supreme Court case
    establishing that a client has a right to testify under these
    circumstances.
    Carter’s argument that counsel did not have an informed
    basis for making the decision not to present a defense because
    he did not go over “in detail” what Carter’s testimony might
    be also fails. The California Supreme Court could reasonably
    have determined that counsel’s decision to focus on the
    penalty phase in the hope that the jury would spare Carter’s
    life was a reasonable tactical decision, made after discussions
    CARTER V. DAVIS                       37
    with Carter about what he would say if he testified. Such a
    decision is not altogether uncommon in capital trials,
    especially where the attorney believes the defendant’s guilt is
    clear, the evidence overwhelming, and the crime heinous.
    Florida v. Nixon, 
    543 U.S. 175
    , 190–91 (2004). Counsel
    explained to Carter that their decision not to present a
    defense, including to not have Carter testify, was this sort of
    “tactical decision.”
    c. Prejudice
    Even if counsel performed deficiently by refusing to let
    Carter testify, the California Supreme Court’s determination
    that Carter cannot show prejudice was not an unreasonable
    application of law. See 
    Carter, 117 P.3d at 526
    . Carter
    argues that there is a reasonable probability the result would
    have been different if he had testified because (1) he would
    have explained the strongest evidence against him, and (2) he
    would have created a reasonable doubt that he had the
    required level of intent for first-degree murder. We disagree.
    Carter never describes what explanation he would have
    given for driving a car belonging to one of the victims at the
    time he was arrested or for having the belongings of several
    of the victims in the car. Carter admits that his possession of
    those belongings was “[p]erhaps the strongest evidence
    against” him, without indicating how he might have
    explained that away. Nor does he explain how he would have
    undercut the physical evidence connecting Carter to the crime
    scenes—the palm print and semen. We cannot conceive of an
    explanation which would have created a reasonable
    probability that he would not have been found guilty.
    
    Strickland, 466 U.S. at 694
    .
    38                    CARTER V. DAVIS
    Carter also contends he would have testified that he
    “effectively ‘blacked out’ during each of the crimes,” and
    thus “been able to successfully assert a ‘diminished actuality’
    defense.” But such testimony would necessarily have
    admitted guilt and thus undercut any innocent explanation for
    having the victims’ belongings in his car.
    Moreover, even if Carter testified, there is no reasonable
    probability—one sufficient to undermine confidence in the
    outcome, 
    Strickland, 466 U.S. at 694
    —that the jury would
    have found him not guilty. To begin, the jury heard this type
    of evidence and still convicted him. For example, the jury
    heard that Carter told a store employee while he was with
    Tok Kim, “I don’t even know what I’m doing here, I don’t
    even know her.” 
    Carter, 117 P.3d at 486
    .
    Similarly, there was so much evidence that Carter
    possessed sufficient mental capacity and intent to commit the
    crimes that it was highly unlikely that the jury would have
    been persuaded otherwise by his testimony. For example,
    Carter asked Cullins and Tiner if they lived alone or with a
    roommate. Carter told Tiner he instructed Cullins not to tell
    Tiner that he was in town. He arrived at Tiner’s house
    despite Tiner’s testimony that she had never given him her
    address. Carter withdrew $60 from Cullins’ bank account,
    leaving a nearly $0 balance. Carter’s numerous crimes were
    performed throughout northern, central, and southern
    California over twenty-three days, and he made it to Arizona
    before he was arrested. The California Supreme Court could
    reasonably have concluded that even if Carter had testified he
    blacked out during each crime, there is no reasonable
    probability the jury would have acquitted him.
    CARTER V. DAVIS                         39
    Carter concedes “the prosecution’s case was strong” on
    this point. To show the result may have been different, he
    points to a juror declaration that the jury vote was mixed for
    guilty and not guilty when deliberations started. He also
    highlights how the jury took nearly five days to reach a guilty
    verdict.
    Although the length of deliberation can be an objective
    sign that the jury struggled with the verdict, all of the cases
    Carter cites to this effect are distinguishable. They all
    involve cases where the length of deliberation was
    disproportionate to the length of the trial, or cases where there
    was only one charge for the jury to deliberate. See Thomas v.
    Chappell, 
    678 F.3d 1086
    , 1103 (9th Cir. 2012) (“The jury
    deliberated for almost five full days, even though it heard
    argument and evidence for only about six days.”); Daniels v.
    Woodford, 
    428 F.3d 1181
    , 1193 (9th Cir. 2005) (“After two
    days of deliberations, the jury returned a verdict imposing
    death [based on one murder].”); Dyas v. Poole, 
    317 F.3d 934
    ,
    936 (9th Cir. 2003) (per curiam) (“[T]he jury took 3-1/2 days
    to deliberate following Dyas’s 5-day trial [on only one
    murder and robbery].”). Here, on the other hand, the trial
    lasted multiple weeks but the jury deliberated only between
    3 1/2 and 4 days, and had over a dozen issues to decide,
    including three murders, two rapes, two residential burglaries,
    and concurrent findings (including whether the murders were
    in the course of rape and burglary). The length of
    deliberation here is not so persuasive a sign that the jury
    struggled with the verdict, and the California Supreme Court
    could reasonably have concluded that it did not create a
    reasonable probability that the result would have been
    different had Carter testified.
    40                    CARTER V. DAVIS
    B. Claims Certified by the Southern District
    The Southern District issued a COA for two separate
    claims. We discuss each in turn and conclude that Carter was
    not deprived of constitutionally adequate representation.
    1. Certified Claim 1 (Claim 3 of Second Amended
    Petition): Ineffective Assistance of Counsel at
    Penalty Phase
    In the first claim certified for our review, Carter alleged
    that his trial counsel “failed to provide reasonably competent
    assistance at the penalty phase of his trial,” and if not for
    counsel’s “unprofessional actions and omissions,” the
    sentence imposed would have been different. Carter raised
    five specific arguments about his counsel’s performance:
    (1) they “failed to adequately investigate mitigating and
    aggravating evidence”; (2) they employed the same penalty
    phase strategy that had been used in the Los Angeles trial, a
    strategy that had resulted in a death verdict; (3) they were
    “ineffective in developing and presenting Carter’s
    background to the jury”; (4) they failed to develop evidence
    of Carter’s mental impairments; and (5) they were “deficient
    in penalty phase closing arguments.” The district court
    rejected each of these arguments.
    On appeal, Carter asks us to find constitutional deficiency
    in the San Diego counsel’s strategy of focusing on the
    positive aspects of his career and family life as an adult,
    rather than giving greater emphasis to his traumatic childhood
    and mental illness. He attributes counsel’s decision to pursue
    this strategy—despite having seen it fail during his Los
    Angeles trial—to their failure to conduct a satisfactory
    investigation of his childhood in Nome. Had counsel’s
    CARTER V. DAVIS                       41
    investigation been sufficient, he alleges, they would have
    instead called additional witnesses who knew of his
    childhood in Nome, and would have elicited more testimony
    from the twenty-one witnesses whom they did call about
    particular forms of abuse Carter had suffered, including that
    his parents chained him up at home and locked him in a
    makeshift jail cell. Additionally, Carter charges that counsel
    did not fully investigate the extent of his mother’s alcohol
    consumption during his gestation and alleges that a sufficient
    investigation would have compelled counsel to present
    evidence that Carter suffered from fetal alcohol syndrome
    (FAS).
    a. Prior Rulings
    Carter did not allege ineffective assistance of counsel
    during the penalty phase of trial on direct appeal to the
    California Supreme Court. He raised this claim for the first
    time in his state habeas petitions, which the California
    Supreme Court summarily denied. The state does not argue
    that this claim was procedurally defaulted, and we treat the
    state court’s decision as a denial of relief on the merits.
    
    Richter, 562 U.S. at 99
    . Because there was no reasoned
    explanation accompanying this decision, Carter must show
    there was “no reasonable basis for the state court to deny
    relief.” 
    Id. at 98.
    Our task is to determine what arguments or
    theories could have supported the California Supreme Court’s
    decision, and whether it is possible that fairminded jurists
    could disagree that those arguments or theories are
    inconsistent with a prior holding of the U.S. Supreme Court.
    
    Id. at 102.
    We conclude that Carter has failed to demonstrate
    that the California Supreme Court lacked a reasonable basis
    for denying relief.
    42                    CARTER V. DAVIS
    b. Performance in Investigating Carter’s Background
    Carter’s first argument is that counsel performed
    deficiently in their investigation of his background in Nome.
    Under Strickland, “counsel has a duty to make reasonable
    investigations or to make a reasonable decision that makes
    particular investigations unnecessary” during the penalty
    phase of a trial. 
    Strickland, 466 U.S. at 691
    (emphasis
    added); see Wiggins v. Smith, 
    539 U.S. 510
    , 526–28 (2003).
    “In any ineffectiveness case, a particular decision not to
    investigate must be directly assessed for reasonableness in all
    the circumstances, applying a heavy measure of deference to
    counsel’s judgments.” 
    Strickland, 466 U.S. at 691
    .
    Five years before trial, the state appointed Charles Ted
    Bumer to serve as Carter’s lead trial counsel and Josephine
    Dedina to serve as co-counsel. Bumer and Dedina were
    assisted by paralegal Kathleen Gilberd and private
    investigators Marion Pasas and Chuck Hile. The trial team
    traveled to Alaska to gather evidence, and Pasas visited
    Carter’s hometown of Nome to interview residents who had
    known the Carter family during his childhood.
    Based on Pasas’s investigation, during the penalty phase
    the defense team called six witnesses, out of a total of twenty-
    one, who knew Carter as a child in Nome. Each of the six
    witnesses testified about the relationship between Carter and
    his parents, and several also gave general testimony about the
    conditions Native Alaskans in Nome faced.
    Carter’s brother Jerry Carter (Jerry) testified that their
    mother Esther and stepfather Jim drank heavily, argued, and
    were often physically violent with one another. He also
    testified that Esther corporally punished the children with
    CARTER V. DAVIS                        43
    branches, a belt, and a razor strap, and that Carter ran away,
    often for several days at a time. Jerry further testified to two
    instances of abuse from Carter’s childhood: an incident
    where a five- or six-year-old Carter was dragged by the
    bumper of Esther’s car while attempting to prevent her from
    going to a bar, and an incident where Jim and Esther chained
    Carter to his bed for a day or two to prevent him from
    running away. Jerry stated that sometime after these
    incidents, Jim and Esther sent Carter away to a home for
    unwanted children.
    Carter’s sister Polly Reaser (Polly) testified that Jim and
    Esther often drank in bars until 4:00 in the morning and were
    violent with one another, and that Carter would have
    witnessed these incidents of drunken violence.
    Local elder Bertha Adsuna had lived in Nome for over
    fifty years at the time of trial. She testified that alcohol was
    a societal problem in the town, that Esther frequented the
    bars, that Carter spent much of his childhood alone, and that
    Esther dressed and treated Carter worse than she did Jerry.
    After Esther married Jim, Adsuna observed that the couple
    often went to bars together.
    Harriet Brown served from 1947 to 1967 as a missionary
    pastor at a Nome church attended mostly by Alaska Natives
    and was Carter’s childhood Sunday-school teacher for two to
    three years. She testified that the largest problem among the
    Native population was alcoholism. She also frequently saw
    child neglect in the community. Brown further testified that
    Jerry and Polly were always dressed well as children, but that
    Carter was not, and that Esther did not treat him nicely.
    44                   CARTER V. DAVIS
    Beth Farley was a childhood classmate of Carter’s. She
    testified that he was often alone, ignored by his family, and
    spent more time with the Farley family than his own. She
    also testified that she left Nome because of pervasive alcohol
    abuse, stating that even the children drank and many died of
    either exposure or suicide. Farley testified that her son was
    part Alaska Native and that she had witnessed and
    experienced prejudice against people of mixed race in Nome.
    Ruth Butts was also a childhood classmate of Carter’s.
    She testified that an incident had led many people to search
    for Carter as a child and that it was common knowledge that
    Jim was not the biological father of either of his stepsons,
    which led children to tease Carter and Jerry. She also
    testified to seeing Jim drunk in bars after church on Sundays.
    Carter argues that this testimony was insufficiently
    compelling to the jury because his counsel had failed to
    further investigate his abusive childhood. A more complete
    investigation, he alleges, would have prompted counsel to call
    additional witnesses to the stand who could have testified to
    more specific instances of abuse.
    Carter first points to counsel’s failure to secure the
    testimony of his mother Esther. Pasas interviewed Esther in
    Nome, but Esther cut the interview short after Pasas asked a
    question about her alcohol consumption. After this aborted
    interview, Esther refused to provide any further assistance to
    her son’s trial defense. However, in support of Carter’s
    habeas petition, Esther submitted a sworn declaration stating
    that had she been “approached differently,” she would have
    “talked to [counsel] and answered all of their questions” and
    “probably would have testified.” Esther declared that her
    testimony would have included recollection of Jim using a
    CARTER V. DAVIS                         45
    belt to discipline Carter, Jim chaining Carter to his bed, and
    she and Jim drinking heavily.
    Carter also submitted several other declarations from
    Nome residents who were not called as defense witnesses
    during the penalty phase and who largely allege that they
    were not contacted or interviewed at the time of trial. As the
    district court noted, these declarations “largely outline, in
    greater detail than presented at trial, the mistreatment [Carter]
    suffered . . . at the hands of his mother and step-father and the
    alcoholism of his parents.”
    Most notably, Carter submitted a declaration from Arthur
    (“Guy”) Martin, a colleague of Jim’s on the Nome police
    force. Martin declared that when responding to a call from
    one of the Carter family’s neighbors reporting child abuse, he
    had observed both Carter and Jerry chained to the floor of the
    family home. He suspected that Jim and Esther frequently
    chained the boys so that they could go out drinking. Martin
    declared that he had confronted Jim about the incident but
    that he had never reported it. Defense counsel had contacted
    and attempted to interview Martin prior to trial, but Martin
    had refused. Martin declared that he had declined to
    participate in the defense only because Esther had asked him
    not to speak to investigators or tell anyone about the abuse.
    Additionally, Vaughn Johnson, a neighbor of the Carters,
    declared that he once saw Carter handcuffed and chained to
    the outside of his house, and that Carter had told Johnson that
    Jim had chained him. Cheryl Stavish, a childhood friend of
    Polly, declared that she recalled the same chaining incident,
    and had also observed a hidden room in the Carter home that
    resembled a jail cell, in which she “had a feeling” Carter was
    held.
    46                    CARTER V. DAVIS
    Carter attributes Esther’s refusal to testify to counsel’s
    inadequate preparation of Pasas, and argues that a competent
    penalty defense would have featured his mother as the central
    witness. And had counsel not alienated Esther, Carter argues,
    Martin would have been willing to testify about the chaining
    incident he observed. He further argues that counsel was
    constitutionally deficient in failing to call both Johnson and
    Stavish, who would have corroborated each other’s separate
    accounts of an incident of Carter being chained. Together, he
    argues, these witnesses could have established that Jim and
    Esther treated Carter more like a dog than a child.
    The state argues that the testimony of Martin, Johnson,
    and Stavish would have been cumulative to that of Jerry, who
    testified that Carter had been chained to his bed for a day or
    two to prevent him from running away. We agree that much
    of their testimony would have been cumulative. But we
    disagree that their testimony would have been so entirely
    cumulative that it would certainly have been excluded as
    irrelevant. These three uncalled witnesses may reasonably
    have provided credible firsthand accounts of two additional
    instances in which Carter’s parents chained him, supporting
    the inference that this was less an aberration than a routine
    practice. Had counsel’s strategy been to present the young
    Carter as a metaphorical feral dog kenneled by his alcoholic
    parents, the eyewitness testimony of Martin, Johnson, and
    Stavish would have been relevant.
    But that was never counsel’s strategy. Rather than
    portray him as a feral child—a strategy which may have
    backfired by leading the jury to infer that the adult Carter was
    beyond rehabilitation—counsel’s choice of witnesses during
    the penalty phase suggests that their intended narrative was
    one of Carter overcoming an abusive childhood home to find
    CARTER V. DAVIS                       47
    personal and professional success before a divorce sent him
    spiraling into a life of violence. Indeed, the majority of
    witnesses counsel called gave testimony recounting how
    Carter had successfully rehabilitated himself as a young adult,
    allowing counsel to argue to the jury that Carter could again
    be capable of growth and redemption. The fifteen penalty-
    phase witnesses who came to know Carter after he left Nome
    included the house parent at the home for unwanted children
    Carter’s parents sent him to, a youth counselor, a probation
    officer, a prison educator, and eleven professionals from the
    media industry who worked with Carter during his career as
    a television cameraman.
    We cannot pass judgment on counsel’s wisdom in
    choosing this narrative strategy over the one Carter argues
    they should have pursued. Rather, our duty is to determine
    what arguments or theories could have supported the state
    court’s decision to deny Carter’s claim that this strategic
    decision amounted to constitutionally deficient assistance,
    and whether fairminded jurists would disagree that those
    arguments or theories are inconsistent with a prior holding of
    the Supreme Court. 
    Richter, 562 U.S. at 102
    .
    The state court could have relied on Strickland’s “highly
    deferential” standard. 
    Id. at 105.
    We “must indulge a strong
    presumption that counsel’s conduct [fell] within the wide
    range of reasonable professional assistance” and presume that
    “under the circumstances, the challenged action ‘might be
    considered sound trial strategy.’” 
    Strickland, 466 U.S. at 689
    (citation omitted). “Strickland does not guarantee perfect
    representation, only a ‘reasonably competent attorney.’”
    
    Richter, 562 U.S. at 110
    (citation omitted). “There is a
    ‘strong presumption’ that counsel’s attention to certain issues
    to the exclusion of others reflects trial tactics rather than
    48                    CARTER V. DAVIS
    ‘sheer neglect.’” 
    Id. at 109
    (quoting Yarborough v. Gentry,
    
    540 U.S. 1
    , 8 (2003) (per curiam)). Here, the state court may
    have reasonably determined that Carter’s trial counsel made
    a legitimate tactical decision to present Carter’s childhood
    trauma as they did rather than pursuing the child abuse angle
    more aggressively. It would have been able to support this
    determination with facts in the record: specifically, that
    counsel hired a professional investigator five years before
    trial began, that the investigator traveled to Carter’s
    hometown and interviewed many people who knew him and
    his parents, and that counsel procured the testimony of
    twenty-one witnesses whose testimony formed a cohesive
    narrative of abuse, perseverance, success, and unraveling.
    Carter argues that this theory conflicts with the holdings
    of two Supreme Court decisions, Williams and Wiggins, in
    which the Court granted habeas relief upon finding that
    counsel had been constitutionally deficient in its investigation
    of the petitioner’s background. However, we are not
    persuaded that fairminded jurists would find that the holding
    of either case is in conflict with the Strickland analysis that
    could support the state court’s denial of habeas relief.
    In Williams, the Court granted relief where counsel failed
    to conduct an investigation into the defendant’s “nightmarish
    childhood” because they incorrectly interpreted Virginia law
    to deny them access to records that were legally available to
    
    them. 529 U.S. at 395
    . Had Williams’s counsel accessed all
    available records,
    the jury would have learned that Williams’
    parents had been imprisoned for the criminal
    neglect of Williams and his siblings, that
    Williams had been severely and repeatedly
    CARTER V. DAVIS                       49
    beaten by his father, that he had been
    committed to the custody of the social
    services bureau for two years during his
    parents’ incarceration (including one stint in
    an abusive foster home), and then, after his
    parents were released from prison, had been
    returned to his parents’ custody.
    
    Id. (footnote omitted).
    Carter argues that the facts of his
    childhood compare strongly to those of Williams.
    We disagree. The holding of Williams is that counsel
    renders constitutionally ineffective assistance if it fails to
    investigate and pursue a reasonable defense because it
    incompetently interpreted the law. 
    Id. Here, Carter
    makes no
    argument that his counsel misinterpreted Alaska law in a way
    that caused them to bypass an investigation of available
    records. More importantly, nothing in Williams tells us that
    counsel is incompetent unless it pursues a defense based
    entirely on the defendant’s neglect as a child. After an
    extensive investigation of Carter’s background, counsel
    implemented a sound defense strategy: to show that Carter
    had suffered under abusive, negligent parents but had risen
    above this poor upbringing. This contrasts with Williams,
    where the “weight of defense counsel’s closing . . . was
    devoted to explaining that it was difficult to find a reason
    why the jury should spare Williams’ life.” 
    Id. at 369.
    Thus,
    Williams does not provide any relevant point of “clearly
    established Federal law,” 28 U.S.C. § 2254(d), on which a
    fairminded jurist could find disagreement with the theories
    supporting the California Supreme Court’s decision. 
    Richter, 562 U.S. at 102
    .
    50                   CARTER V. DAVIS
    In Wiggins, trial counsel conducted no investigation into
    the defendant’s background beyond reviewing a Presentence
    Investigation Report and social services 
    records. 539 U.S. at 523
    . Counsel did not take advantage of public defense funds
    for commissioning a forensic social worker, which the record
    indicated was standard practice in the Maryland legal
    community at the time of the trial. 
    Id. at 524.
    Further,
    counsel did not follow up on any of the red flags apparent in
    Wiggins’s social services records, including his mother’s
    history of alcoholism and child neglect. 
    Id. at 525.
    Again,
    Carter analogizes his case to the underlying facts of Wiggins.
    However, the Sixth Amendment violations that the Court
    clearly identified in Wiggins were counsel’s failure to take
    advantage of funds to commission a social worker and their
    failure to take any action upon discovering red flags
    indicating that Wiggins may have experienced child abuse.
    Carter does not plausibly allege that counsel failed to follow
    up on reports that Carter was abused as a child. In fact,
    counsel traveled to Alaska, hired a professional investigator
    to interview his relatives and neighbors, and put six of them
    on the witness stand to testify about his abusive childhood,
    his parents’ alcoholism, and the conditions of discrimination
    he faced as an Alaska Native. Carter’s counsel, unlike
    Wiggins’s counsel, thus competently followed up on their
    investigation into Carter’s social history. Wiggins, like
    Williams, provides no support for Carter’s habeas claim.
    Likewise, Carter cites no relevant support for his
    argument that counsel performed deficiently by failing to
    procure the testimony of Esther or Martin. We are aware of
    no Supreme Court case requiring counsel to secure the
    cooperation of reluctant witnesses. And for good reason. A
    witness asked to testify in support of a friend or family
    member convicted of capital murder faces an intensely
    CARTER V. DAVIS                       51
    difficult, personal decision that belongs to the witness alone,
    and counsel’s duty cannot reasonably be extended to compel
    a witness to participate in the defense. Carter’s counsel had
    a duty to “make reasonable investigations,” 
    Strickland, 466 U.S. at 691
    , which the state court could have found that
    counsel satisfied by interviewing Esther and attempting to
    interview Martin.
    Carter also argues that counsel’s choice of strategy was
    constitutionally deficient because his Los Angeles County
    trial counsel had employed a similar narrative, without
    success, during the penalty phase of those proceedings. That
    begs the questions of whether there was another approach that
    was clearly more likely to have produced a better outcome.
    Counsel in this case was dealt a difficult hand. We have not
    been persuaded that there was an alterative argument so
    attractive that the failure of counsel to take that other path
    amounted to ineffective assistance.
    Moreover, the state court’s rejection of this argument
    could reasonably be supported by Strickland. There, the
    Court held that courts should not conclude that a “particular
    act or omission of counsel was unreasonable” merely because
    it “proved unsuccessful.” 
    Id. at 689.
    Rather, it must presume
    that counsel’s decision fell “within the wide range of
    reasonable professional assistance.” 
    Id. In this
    light, because
    we presume both the Los Angeles and San Diego attorneys
    were professionally competent, the fact that both teams
    decided to pursue the same strategy after considering all the
    evidence they had available to them only supports the state
    court’s position that neither defense team was unreasonable
    in its choice. Because Carter cites no Supreme Court holding
    that fairminded jurists could disagree was consistent with this
    plausible theory, this argument also fails.
    52                    CARTER V. DAVIS
    c. Performance in Investigating Carter’s Mental
    Health
    Carter argues that counsel failed to conduct an adequate
    investigation into his mental health, including the possibility
    that he suffered from FAS. But as we have explained,
    “counsel’s decision not to pursue a mental health defense is
    a reasonable strategic decision under Strickland ” when
    “adopting a mental health defense would open the door to
    [unfavorable] rebuttal testimony.” Atwood v. Ryan, 
    870 F.3d 1033
    , 1063 (9th Cir. 2017).
    Here, the record indicates that, at counsel’s request, a
    Dr. Lottenberg performed a PET scan of Carter’s brain
    approximately one week before the penalty phase of trial
    began. Counsel consulted with several experts, who
    recommended that the results be sent to Dr. Monte
    Buchsbaum for analysis. The court held an in-chambers
    teleconference with counsel and Dr. Buchsbaum, during
    which Dr. Buchsbaum identified an unusually high number of
    abnormalities in Carter’s brain. He then stated that he would
    need additional information to render a more detailed and
    substantive opinion about Carter. After this hearing, Carter’s
    counsel spoke to Dr. Buchsbaum alone and off the record.
    Counsel then informed the court that it had made a “tactical
    decision” not to introduce evidence of Carter’s mental health
    during the penalty phase. Judge Lasater noted on the record
    her agreement with counsel’s decision because
    Dr. Buchsbaum’s testimony would have opened the door to
    rebuttal evidence of Carter’s mental health from the state.
    The trial record contains several mental health reports
    unfavorable to Carter that the state could have introduced
    during the penalty phase if the door had been opened. A
    CARTER V. DAVIS                         53
    1973 psychological evaluation found Carter to be a “fairly
    classical sociopathic personality.” A probation report from
    the same year noted that Carter’s personality gave him “little
    chance at ever making acceptable social adjustment.” A 1975
    psychiatrist’s evaluation found that, by Carter’s own
    admission, “his irritability and destructively aggressive
    conduct that emanates from it are willful, the result of
    personal choice, and represent matters over which he could
    exercise control if he chose to do so.” A 1977 psychological
    evaluation found that Carter “tended to see things in a
    concrete way with little insight.” A 1977 Alaska pre-sentence
    report described Carter’s behavior as “best explained [by]
    focusing on his immaturity and lack of consideration of
    consequences.” And a 1978 evaluation found that Carter had
    some indicia of psychiatric problems but did not need mental
    health assistance at the time, and described his behavior as
    “self-punitive in that he feels guilt for his misbehavior, but is
    not deterred by the guilt.”
    We agree with both the trial judge’s observation and the
    district court’s conclusion that Carter’s counsel would have
    opened the door to introduction of this potentially damaging
    evidence by putting forth a mental health defense at trial.
    Notably, the district court was careful to emphasize that “this
    is not a case in which counsel failed to conduct any mental
    health investigation.” Carter’s counsel ordered a PET scan of
    Carter’s brain, conferred with an appropriate expert
    recommended by multiple other experts in the field, and made
    a tactical decision not to present mental health evidence at
    trial. Strickland directs us to presume that the challenged
    actions of counsel were “sound trial 
    strategy,” 466 U.S. at 689
    , a presumption that is here supported by the
    aggravating mental health evidence that would have been
    made relevant for rebuttal purposes by Dr. Buchsbaum’s
    54                        CARTER V. DAVIS
    testimony.7 Thus, we may conclude that the state court
    properly denied relief under Strickland’s deferential standard.
    Carter also argues that counsel was deficient in failing to
    investigate and present evidence that he suffered from FAS,
    averring that competent attorneys would have pursued this
    avenue after learning that Esther consumed alcohol while
    pregnant. However, there is no evidence in the trial record
    that would have put Carter’s counsel on notice that Esther
    drank while pregnant. Carter cites counsel’s interviews with
    Jerry and Adsuna, but these interviews only reference
    Esther’s drinking in her later years, after she gave birth to her
    children. Further, this argument fails for the tactical reasons
    described above, as any argument by counsel that Carter’s
    actions could be attributable to FAS would have opened the
    door to the potentially damaging rebuttal evidence contained
    in the record.
    In sum, Carter has succeeded only in establishing that
    counsel may have chosen to pursue other strategies during the
    penalty phase of his trial. He has failed to establish that
    counsel’s investigation was deficient. Rather, our review of
    the state trial record shows that counsel acted with diligence
    beginning five years before trial to investigate events that
    took place thirty years prior in a remote town thousands of
    7
    Indeed, we granted habeas relief on an ineffective assistance
    claim—albeit in a pre-AEDPA case—where trial defense counsel
    presented an expert mental health witness whose testimony suggested that
    the defendant “may be a sociopath.” Daniels v. Woodford, 
    428 F.3d 1181
    ,
    1210 (9th Cir. 2005). Here, even if Dr. Buchsbaum’s testimony had been
    sympathetic to Carter, it may have directly led to the introduction of the
    1973 psychological evaluation finding Carter to be a “fairly classic
    sociopathic personality.” We have no basis for second-guessing counsel’s
    tactical decision not to pursue this line of defense.
    CARTER V. DAVIS                       55
    miles away, and counsel succeeded in contacting a significant
    number of Carter’s relatives, friends, neighbors, co-workers,
    and correctional counselors. Counsel elicited trial testimony
    from twenty-one of these individuals which tended to show
    that Carter had been severely abused as a child but had, as an
    adult, shown the capacity to be rehabilitated and function as
    a productive member of society. Counsel also conducted a
    PET scan of Carter’s brain, but after conferring with a
    recognized expert, decided that the sum of the mental health
    evidence would be more aggravating than mitigating. On this
    record, Carter has failed to establish that the California
    Supreme Court was unreasonable in denying his ineffective
    assistance of counsel claim.
    2. Certified Claim 2 (Claim 4 of Second Amended
    Petition): Denial of Psychiatric Expert Assistance at
    Trial
    In the second claim certified by the Southern District for
    our review, Carter alleged that “he was deprived of the right
    to competent assistance of a psychiatric expert,” that “counsel
    had an obligation to properly prepare the experts” who
    evaluated him, and that their failure to do so constituted
    ineffective assistance. Carter raised this claim in his first
    state habeas petition, which the California Supreme Court
    summarily denied. We treat that decision as a denial on the
    merits. 
    Richter, 562 U.S. at 99
    . Because the decision was
    not accompanied by a reasoned explanation, Carter has the
    burden to show that “there was no reasonable basis for the
    state court to deny relief.” 
    Id. at 98.
    Again, our task is to
    determine what arguments or theories could have supported
    the California Supreme Court’s decision, and “whether it is
    possible fairminded jurists could disagree that those
    arguments or theories are inconsistent” with a prior holding
    56                    CARTER V. DAVIS
    of the U.S. Supreme Court. 
    Id. at 102.
    We conclude that no
    such inconsistency exists here.
    Carter bifurcated this claim into a charge that his
    attorneys failed to render effective assistance in preparing
    expert psychiatric witnesses, and a charge that his experts
    themselves rendered ineffective assistance. The district court
    construed the portion of the claim charging counsel as
    ineffective as a mere repetition of the prior certified claim
    regarding a FAS defense. We agree, and hold that Carter is
    not entitled to relief for the reasons stated immediately above.
    Carter argues that the state court’s denial of relief on his
    claim that his expert witnesses were ineffective is in tension
    with the Supreme Court’s holding in Ake v. Oklahoma,
    
    470 U.S. 68
    (1985). There, a state-supplied psychiatrist
    repeatedly evaluated a mentally ill murder defendant before
    trial, first deeming him not competent to stand trial but later
    deeming him competent. 
    Id. at 70–72.
    During trial, defense
    counsel requested that the indigent defendant be provided
    with a psychiatrist to examine him “with respect to his mental
    condition at the time of the offense.” 
    Id. at 72.
    The state trial
    judge denied the request. 
    Id. The Supreme
    Court granted
    certiorari on direct appeal and held that “the participation of
    a psychiatrist is important enough to preparation of a
    defense” that the Due Process Clause of the Fourteenth
    Amendment may require a state to provide an indigent
    defendant with psychiatric assistance under certain
    circumstances. 
    Id. at 77.
    At no point did the Court in Ake place any obligation on
    defense counsel to present psychiatric evidence at trial.
    Rather, that case’s holding is limited to imposing an
    obligation on states to make a psychiatrist available to a
    CARTER V. DAVIS                        57
    murder defendant upon the satisfaction of the balancing test.
    An Ake claim is not a Sixth Amendment ineffective
    assistance of counsel claim, but rather a Fourteenth
    Amendment due process claim against the state. 
    Id. at 76
    (“This Court has long recognized that when a State brings its
    judicial power to bear on an indigent defendant in a criminal
    proceeding, it must take steps to assure that the defendant has
    a fair opportunity to present his defense. This elementary
    principle [is] grounded in significant part on the Fourteenth
    Amendment’s due process guarantee of fundamental fairness
    . . . .”).
    We conclude that Carter has failed to establish that Ake or
    any other Supreme Court decision would cause jurists of
    reason to disagree with the reasonable arguments in support
    of the state court’s decision. Carter conceded in his brief that
    the Supreme Court has never interpreted Ake to guarantee a
    due process right to effective expert assistance at trial.
    Rather, the Court has never extended the state’s obligation
    beyond providing a psychiatric expert to an indigent
    defendant, and Carter does not dispute that he had access to
    such an expert. Because we may rely only on the holdings of
    the Supreme Court in evaluating whether the state court’s
    decision was reasonable, 
    Williams, 529 U.S. at 412
    , our
    analysis ends here. We do not address Carter’s arguments
    that rely on “circuit precedent,” which “cannot form the basis
    for habeas relief under AEDPA.” 
    Parker, 567 U.S. at 48
    –49.
    IV. UNCERTIFIED CLAIMS
    Carter also raised several arguments relating to claims
    that the district courts did not certify in a COA. As a state
    prisoner seeking relief under § 2254, Carter has “no
    automatic right to appeal” the denial or dismissal of his
    58                    CARTER V. DAVIS
    petition. Miller-El v. Cockrell, 
    537 U.S. 322
    , 327 (2003).
    We lack jurisdiction to review a district court’s denial of a
    habeas claim “aris[ing] out of process issued by a State court”
    until and unless a federal court has issued a COA. 28 U.S.C.
    § 2253(c)(1)(A); 
    Miller-El, 537 U.S. at 336
    . We accordingly
    construe Carter’s arguments on these uncertified claims as a
    motion to expand the COA. See 9th Cir. R. 22-1(e).
    “A certificate of appealability may issue [in federal
    habeas review of state proceedings] only if the applicant has
    made a substantial showing of the denial of a constitutional
    right.” 28 U.S.C. § 2253(c)(2) (emphasis added); see Wilson
    v. Belleque, 
    554 F.3d 816
    , 825–26 (9th Cir. 2009). This
    statutory requirement “serves a gatekeeping function.”
    Payton v. Davis, 
    906 F.3d 812
    , 818 (9th Cir. 2018). In
    enacting § 2253, “Congress confirmed the necessity and the
    requirement of differential treatment for those appeals
    deserving of attention from those that plainly do not.” Miller-
    
    El, 537 U.S. at 337
    . “It follows that issuance of a COA must
    not be pro forma or a matter of course.” 
    Id. Nevertheless, the
    “standard for obtaining a COA is not a
    particularly exacting one.” 
    Wilson, 554 F.3d at 826
    . “[A]
    court of appeals should not decline the application for a COA
    merely because it believes the applicant will not demonstrate
    an entitlement to relief.” Miller-
    El, 537 U.S. at 337
    . Rather,
    “[a]t the COA stage, the only question is whether the
    applicant has shown that ‘jurists of reason could disagree
    with the district court’s resolution of his constitutional claims
    or that jurists could conclude the issues presented are
    adequate to deserve encouragement to proceed further.’”
    Buck v. Davis, 
    137 S. Ct. 759
    , 773 (2017) (quoting 
    Miller-El, 537 U.S. at 327
    ). But when a district court “denies a habeas
    petition on procedural grounds without reaching the
    CARTER V. DAVIS                        59
    prisoner’s underlying constitutional claim,” a COA can issue
    only if the prisoner shows that (1) “jurists of reason would
    find it debatable whether the district court was correct in its
    procedural ruling,” and (2) “jurists of reason would find it
    debatable whether the petition states a valid claim of the
    denial of a constitutional right.” Slack v. McDaniel, 
    529 U.S. 473
    , 484 (2000).
    We ordered supplemental briefing on several of the
    uncertified claims. Given the low bar for issuing a COA, see
    
    Miller-El, 537 U.S. at 338
    , for the reasons discussed below,
    we issue a COA on one claim not certified by the Central
    District that alleged ineffective assistance of counsel at the
    penalty phase. Although we issue a COA, we affirm the
    denial of habeas relief on this claim because the California
    Supreme Court’s determination that counsel satisfied
    Strickland’s deferential standard is not contrary to or an
    unreasonable application of federal law. 
    Richter, 562 U.S. at 105
    .
    A. Claim 6 of the Central District Habeas Petition:
    Ineffective Assistance of Counsel at the Penalty Phase
    Similar to the claim certified by the Southern District that
    Carter’s counsel was ineffective during the penalty phase,
    claim six in Carter’s Central District habeas petition argued
    that if his attorneys had conducted more than an “initial
    attempt” at an investigation, they would have uncovered more
    evidence of child abuse and brain damage. Presentation of
    this additional evidence, he contends, would have changed
    the result at the penalty phase. We, however, can find no
    grounds for believing that the California Supreme Court
    unreasonably denied relief given the record of counsels’
    collective efforts.
    60                     CARTER V. DAVIS
    1. Mitigation Evidence Presented at Penalty Phase
    Counsel called twenty-one witnesses to present mitigating
    evidence. Carter’s siblings, Jerry and Polly, testified that
    their parents were alcoholics who often came home late after
    drinking with “extreme arguing” that included hitting,
    throwing furniture, and throwing each other. Their mother
    also sometimes “g[o]t carried away” administering discipline
    with the children. Although Jerry denied that Carter was
    treated “that much worse” than Jerry, other Nome residents
    testified that Jerry was treated better than Carter. One
    neighbor even testified that Carter was “more like an orphan”
    when the boys were young.
    Set against this background, the jury heard about dramatic
    instances of abuse and Carter’s unusual family life. They
    heard about a time when Carter was seven or eight that their
    mother came home around 2:00 a.m. but started to leave
    again to pick up their father, and Carter tried to get her to stay
    home by “t[aking] off running after the car,” “holler[ing] at
    [her] to stop,” and “h[anging] on to the bumper and tried to
    stop the car for quite a ways,” being dragged over a gravel
    road. They heard that Carter’s father chained him to a bed at
    least once when he was only eight or nine years old.
    The jury heard that in the midst of all this misery, Carter
    often ran away for several days at a time, including once to
    Anchorage by plane. Around age eight or nine, Carter’s
    parents sent him to the Jessie Lee Home, far from Nome,
    which Carter’s sister Polly described as “a jail or something
    for children.” Even when the family traveled near the Home,
    they did not stop to visit him, which “shocked” Polly.
    CARTER V. DAVIS                       61
    On appeal, post-conviction counsel submitted declarations
    tending to show that Carter being held in chains was not a
    one-time event. Childhood friends, classmates, and adults
    wrote in post-conviction declarations that they saw Carter
    handcuffed and chained to Carter’s cabin, or held in a
    makeshift jail cell. One police officer who investigated
    allegations of abuse at the Carter house said he saw Carter,
    and possibly Jerry, chained to the floor with a bowl of water
    next to them. Counsel also asserted that Carter suffered from
    organic brain damage and Fetal Alcohol Syndrome at the
    time of the crimes, and that evidence to that effect should
    have been presented.
    2. Ineffective Assistance of Counsel
    Carter argues that trial counsel were ineffective because
    they failed to investigate and present more mitigating
    evidence regarding child abuse and possible brain damage.
    Since there is no state-court reasoned decision on this issue,
    Carter must show that “there was no reasonable basis for the
    state court to deny relief.” 
    Richter, 562 U.S. at 98
    . He
    cannot.
    a. Performance
    First, the California Supreme Court could reasonably have
    concluded that counsel did not perform deficiently because
    their presentation was based on strategic choices after a
    reasonable investigation. A defense attorney has a duty to
    make reasonable investigations that enable informed
    decisions about how best to represent the client. 
    Strickland, 466 U.S. at 691
    ; Sanders v. Ratelle, 
    21 F.3d 1446
    , 1457 (9th
    Cir. 1994). But “[j]udicial scrutiny of counsel’s performance
    must be highly deferential,” 
    Strickland, 466 U.S. at 62
                       CARTER V. DAVIS
    689—“doubly so” when § 2254(d) is also involved, 
    Richter, 562 U.S. at 105
    . Carter has the burden to “identify the acts or
    omissions of counsel that are alleged not to have been the
    result of reasonable professional judgment.” 
    Strickland, 466 U.S. at 690
    .
    Gillingham testified in a post-conviction declaration that
    his performance at sentencing could have been better in
    various ways:
    •   He was “unable to build rapport or develop
    [Carter’s] confidence,” which “contributed to
    [his] inability [to] present a compelling case in
    mitigation;”
    •   He was unable to secure Carter’s mother’s
    cooperation, as “she was not willing to discuss her
    life, petitioner’s birth father, circumstances
    surrounding his birth, his childhood, or any other
    subject related to her family;”
    •   He “failed and omitted to prepare a social
    historian or cultural anthropologist” or “a
    psychiatrist, psychologist or other mental health
    professional,” even though he believed Carter’s
    “childhood and adolescence were neglectful and
    alienating, and [was] aware of his long-term drug
    and alcohol abuse;”
    •   Although he “suspected the possibility of organic
    brain damage,” and a mental health professional
    he consulted suggested an MRI, he did not request
    an MRI or PET scan; and
    CARTER V. DAVIS                        63
    •   He generally “was unable to formulate any
    coherent strategy or plan to defend petitioner in
    guilt or penalty phases of trial.”
    As the district court explained, however, Gillingham
    falling on his sword “in retrospect” is “not dispositive.”
    Rather, to fairly assess attorney performance, a court “must
    judge the reasonableness of counsel’s challenged conduct on
    the facts of the particular case, viewed as of the time of
    counsel’s conduct.” 
    Strickland, 466 U.S. at 690
    . Viewed in
    that light, and especially given that “counsel is strongly
    presumed to have rendered adequate assistance and made all
    significant decisions in the exercise of reasonable
    professional judgment,” the California Supreme Court could
    reasonably have concluded that Gillingham’s team did not
    perform deficiently. See 
    id. Carter’s attorneys
    went to great lengths to investigate
    Carter’s troubled childhood. Both Gillingham and Morrissey
    traveled to Nome to interview family members and other
    residents, and their investigator Casey Cohen made four
    separate trips to Alaska and spoke with about forty different
    people. Cohen tried very hard to speak with Carter’s mother
    because he considered her “a very important” “primary
    witness to his early childhood.” Although he spoke to her “at
    least three times” in person, and “probably several times by
    phone,” Carter’s mother refused to cooperate, including by
    telling others not to communicate with Cohen.
    While acknowledging the “resistance” his defense team
    faced from “unhelpful” Nome residents, Carter claims that if
    his counsel had done more than “an initial attempt” at an
    investigation, they would have gotten more people to testify
    and presented a fuller picture of the extent of the abuse Carter
    64                    CARTER V. DAVIS
    suffered as a child. But the problem is not that Carter’s
    counsel made only an “initial attempt” at an investigation, but
    rather that they diligently followed leads and were met with
    dead ends. Cf. 
    Wiggins, 539 U.S. at 523
    –25 (finding counsel
    unreasonably abandoned their investigation even though
    records in their possession put them on notice of possible
    child abuse). For example, although Cohen “pressed her hard
    to be honest with” investigators, Edna Buffas, whose father
    worked with Jim Carter and had “always” known the Carters,
    repeatedly called Dean “happy-go-lucky” and said “she
    couldn’t think of anything that might have improved the
    Carter family.”
    Any “failure to investigate thoroughly” here resulted not
    “from inattention,” but from thwarted attempts. See 
    Wiggins, 539 U.S. at 526
    . Attorneys are expected to formulate
    reasonable strategies that “balance limited resources in accord
    with effective trial tactics and strategies.” 
    Richter, 562 U.S. at 107
    . Thus when they hit dead ends like this, they may
    abandon those inquiries, especially if they determine they are
    “distractive from more important duties.” 
    Id. (quoting Bobby
    v. Van Hook, 
    558 U.S. 4
    , 11 (2009) (per curiam)).
    Moreover, Carter’s arguments downplay his own role in
    what he claims to be a stunted investigation. See 
    Strickland, 466 U.S. at 691
    (“The reasonableness of counsel’s actions
    may be determined or substantially influenced by the
    defendant’s own statements or actions.”). Indeed, there was
    evidence that Carter himself told Polly and Jerry not to talk
    to defense investigators. As another example, Carter argued
    that “if Gillingham and Carter did not have a conflict, then
    Carter could have encouraged his mother and siblings to
    cooperate with trial counsel, which then would have led to a
    more fruitful mitigation investigation.” But if this alleged
    CARTER V. DAVIS                       65
    conflict prevented his mother and siblings from cooperating
    in a way that Carter should benefit from, he has not explained
    how. Moreover, Carter himself could have given the defense
    team the details he claims people could have provided. See
    
    id. (“[W]hen the
    facts that support a certain potential line of
    defense are generally known to counsel because of what the
    defendant has said, the need for further investigation may be
    considerably diminished or eliminated altogether.”). The
    California Supreme Court could reasonably have determined
    that the investigation was not inadequate.
    Carter also argues that it was “unreasonable” for trial
    counsel to decide “to focus their investigative efforts on
    developing evidence about Carter’s moderately successful life
    as an adult.” But Carter has not “overcome the presumption
    that, under the circumstances,” counsel’s investigation and
    presentation “might be considered sound trial strategy”
    developed after a thorough investigation.                 
    Id. at 689–91(citation
    omitted). Indeed, there is evidence that
    this is so. In a memo written after interviewing Jerry Carter,
    Cohen wrote, “As the interview progressed we felt that there
    was no history of child abuse so significant that it would tie
    in with a general theory as-to why Dean ends up murdering
    anyone.” He expanded,
    [A] penalty phase defense would be focused
    as follows: To use Jerry only to tell the good
    about Dean and to plead with the jury to spare
    his life. To not try and construct a theory
    around any kind of child abuse. To lay out
    Dean’s life as it occurred. To recount how he
    perceived some problem deeply enough to try
    and run away from home from age 7 onward.
    To tell how he got into trouble, went to
    66                   CARTER V. DAVIS
    institutions, and eventually grew up. Then, as
    an adult he rehabilitates himself, gets a good
    job, marries, and settles down. But problems
    in the marriage develop.
    “[S]trategic choices made after thorough investigation of law
    and facts relevant to plausible options are virtually
    unchallengeable.” 
    Id. at 690.
    “There are countless ways to
    provide effective assistance in any given case. Even the best
    criminal defense attorneys would not defend a particular
    client in the same way.” 
    Id. at 689.
    Carter again relies heavily on Wiggins, 
    539 U.S. 510
    . But
    in Wiggins, defense counsel failed to present any evidence of
    the defendant’s life history, justifying this as “a tactical
    judgment not to present mitigating evidence at sentencing”
    and instead dispute Wiggins’ direct responsibility for the
    
    murder. 539 U.S. at 521
    . Here, the jury heard much about
    the abuse, including how Carter was treated worse than Jerry,
    chained at least once, and ran away multiple times because of
    the misery. As the district court reasoned, the California
    Supreme Court may reasonably have concluded that trial
    counsel decided not to present this evidence because (a) the
    jury would not have responded well to the insinuation that a
    child abused this badly would inevitably go on to rape, kill,
    and burglarize multiple women; (b) that the evidence of Fetal
    Alcohol Syndrome or brain damage would not have been well
    received because of the evidence that Carter acted so
    rationally over such a long period of time; and (c) that the
    evidence largely duplicated what they already presented.
    For example, declarations from Vaughn Johnson, Chuck
    Reader, and Cheryl Stavish that Carter was chained—which
    may or may not have been describing the same incident—are
    CARTER V. DAVIS                       67
    compelling, but the jury knew that Carter was chained as a
    child. Moreover, some of the evidence Carter faults his
    counsel for not presenting contradicted other evidence
    presented. For example, Jerry testified he himself was never
    chained, so the Officer’s possible testimony saying that Jerry
    might have been chained would have been less helpful. Jerry
    also denied that Carter was treated “that much worse” than he
    was, so the value of additional evidence regarding the
    disparity between the two was minimal.
    Additionally, as the government points out, many of the
    declarations Carter now submits rest on hearsay. For
    example, Cheryl Stavish testified that Polly told her that she
    used to hear Carter’s father beating or whipping him; Officer
    Martin stated that Sophie Swanson told him the boys were
    chained every time the Carter parents went out to drink,
    which was frequently; and Chuck Reader declared that Ivan
    Johnson told him Carter was chained and locked up “almost
    all of the time.” Moreover, some witnesses are less than
    confident in their claims. For example, Michael Ashmasuk
    testified that he and his friends “assumed Jim Carter had
    locked [Carter] in the closet,” (emphasis added); Officer
    Martin stated that he “found Dean and Jerry Carter chained to
    the floor,” but clarified that he “could see the chain on Dean,
    but [did not] remember seeing the chain on Jerry.” The state
    court could reasonably have concluded that the investigation
    was sufficient.
    The question here is not whether Carter’s attorneys should
    have introduced more mitigating evidence, but rather whether
    the investigation supporting counsel’s decision not to
    introduce more mitigating evidence was reasonable. See 
    id. at 523.
    The California Supreme Court may reasonably have
    68                    CARTER V. DAVIS
    concluded that the answer to that question was yes, that
    counsel’s decision was reasonable.
    b. Prejudice
    Even if Carter’s defense team performed deficiently, the
    California Supreme Court could reasonably have concluded
    that Carter was not prejudiced by their performance. To
    show prejudice, Carter must show that “there is a reasonable
    probability that, absent the errors, the sentencer . . . would
    have concluded that the balance of aggravating and mitigating
    circumstances did not warrant death.” 
    Strickland, 466 U.S. at 695
    . But here, there was no reasonable probability that the
    outcome would have been different if a jury had heard more
    evidence about the extent of the abuse Carter suffered,
    especially given the hearsay, contradictory, and weak nature
    of the additional evidence. 
    Id. at 694.
    A death verdict with overwhelming record support is less
    likely to have been affected by errors than one only weakly
    supported by the record. 
    Id. at 696.
    As the California
    Supreme Court noted and Carter concedes, there was “strong
    evidence directly linking defendant to the charged murders.”
    
    Carter, 117 P.3d at 527
    .
    B. Remaining Uncertified Claims
    We conclude that no jurist of reason would find it
    debatable that any of Carter’s remaining uncertified claims
    states the denial of a constitutional right. See 
    Wilson, 554 F.3d at 826
    . We therefore deny a COA as to the rest of
    the claims not certified by the Southern and Central District
    Courts.
    CARTER V. DAVIS                      69
    V. CONCLUSION
    For the foregoing reasons, in Case No. 13-99003, the
    judgment of the United States District Court for the Central
    District of California is AFFIRMED.
    For the foregoing reasons, in Case No. 13-99007, the
    judgment of the United States District Court for the Southern
    District of California is AFFIRMED.
    Carter’s supplemental motion to expand the certificate of
    appealability, filed October 6, 2015, is GRANTED as to
    Claim 6 in Case No. 13-99003, and otherwise DENIED.