Mark Allen Jenkins v. Commissioner, Alabama Department of Corrections. ( 2020 )


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  •            Case: 17-12524   Date Filed: 06/29/2020   Page: 1 of 81
    [PUBLISH]
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE ELEVENTH CIRCUIT
    No. 17-12524
    D.C. Docket No. 4:08-cv-00869-VEH
    MARK ALLEN JENKINS,
    Petitioner - Appellant,
    versus
    COMMISSIONER, ALABAMA DEPARTMENT OF CORRECTIONS,
    Respondent - Appellee.
    Appeal from the United States District Court
    for the Northern District of Alabama
    (June 29, 2020)
    Before WILSON, BRANCH, and TJOFLAT, Circuit Judges.
    BRANCH, Circuit Judge:
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    We sua sponte vacate our previous opinion and substitute the following in
    lieu thereof. 1
    *      *     *
    Mark Allen Jenkins, an Alabama prisoner sentenced to death for the 1989
    murder of Tammy Ruth Hogeland, appeals the district court’s denial of his petition
    for a writ of habeas corpus, 28 U.S.C. § 2254. Before us are Jenkins’s arguments
    that he received ineffective assistance of counsel during the penalty phase of his
    trial and that he is intellectually disabled and therefore ineligible for the death
    penalty. After careful consideration, and with the benefit of oral argument, we
    affirm the denial of Jenkins’s habeas petition on both grounds.
    I.      BACKGROUND
    A.        The Crime and Arrest
    We summarize the following background narrative from opinions of the
    Alabama Court of Criminal Appeals and our own review of the record. See Jenkins
    v. State, 
    627 So. 2d 1034
    , 1037–40 (Ala. Ct. Crim. App. 1992); Jenkins v. State,
    
    972 So. 2d 111
    , 119–20 (Ala. Ct. Crim. App. 2004). The events leading up to the
    murder began the evening of April 17, 1989. Jenkins was at the home of his
    1
    We note that appellant has a pending petition for rehearing en banc along with a supporting
    amicus brief. We will still consider appellant’s petition in light of this substituted opinion, and
    therefore he need not refile. However, appellant may file a ten-page supplemental petition based
    on the new opinion if desired within the standard time frame for filing rehearing petitions.
    2
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    acquaintance Christine Nicholas. He had met her several months earlier at the
    Omelet Shoppe restaurant where she worked. Jenkins was very intoxicated and
    tried to seduce her. When she resisted, Jenkins got “real mad” and asked her
    several times what she would do if someone came up from behind her and grabbed
    her.
    At around 1 a.m., Jenkins and Nicholas drove to the Riverchase Omelet
    Shoppe. Jenkins went inside and talked with one of the waitresses, Frieda Vines.
    The manager, Douglas Thrash, recognized Jenkins as a regular customer who knew
    all of the waitresses. Thrash overheard part of Jenkins’s conversation with Vines
    and heard mention of the Omelet Shoppe location near the Birmingham Airport.
    Jenkins and Nicholas then returned to Nicholas’s home. Around 2 a.m., Nicholas’s
    mother asked Jenkins to leave. He did so, falling down some steps and ramming
    his car into another vehicle in the process.
    Meanwhile, 23-year-old Tammy Hogeland was making her way to work at
    the Omelet Shoppe. Her sister Wendy, along with Tammy’s young son, picked
    Tammy up from her college classes and drove her to the Riverchase Omelet
    Shoppe a little after 9:30 p.m. Sometime after 10:00, Tammy was sent to work at
    the airport Omelet Shoppe on Tenth Avenue, since that location was unexpectedly
    shorthanded. Tammy was wearing her watch, a necklace with the words “special
    sister,” her class ring, and her diamond engagement ring. Tammy was working as a
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    cook that night and was wearing a blue apron, black pants, a white shirt, and white
    shoes. She and Sarah Harris were the only employees working at the airport
    Omelet Shoppe that night.
    At about 2 a.m. on April 18, Harris saw Jenkins—whom she did not know—
    drive up in a red sports car. His arrival was memorable to Harris because the car
    nearly jumped the curb and crashed through the restaurant’s glass wall. Jenkins got
    out of the car and came into the restaurant, appearing to be intoxicated. He walked
    over to Hogeland and began talking to her. Harris later saw Jenkins and Hogeland
    drive away together in the red sports car. That was the last time anyone who knew
    Hogeland ever saw her. Hogeland left behind her cigarettes, lighter, purse, and
    paycheck. She left without telling anyone, which she had never done before.
    Although Harris saw them drive off, she could not later say whether Hogeland left
    with Jenkins willingly or was instead abducted.
    At around 5 a.m. that morning, Bobby and Geraldine Coe had stopped to
    buy gas at a Chevron station on I-59 northeast of Birmingham when they saw
    Jenkins drive up in the red sports car. The Coes noticed a female who appeared to
    be “passed out” in the front passenger seat, but they could not say whether she was
    alive or dead. While Bobby Coe was pumping gas, Jenkins asked him for some
    cigarettes and said, “Looks like it’s been a long night and it looks like it’s going to
    be a long day.” Jenkins then said “God bless you” before asking directions to I-
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    459. Coe gave him directions and got back in his car. As Coe pulled out onto the
    interstate, he saw Jenkins follow him in the red sports car. Coe then saw the car
    flash its lights, slow down, and pull to the side of the road between mile markers
    151 and 152.
    At 8 a.m., Wendy Hogeland learned that Tammy was not at the restaurant,
    and their mother called the police. Meanwhile, Jenkins went to the home of Steve
    Musser, who noticed that he was wearing the same clothes as the day before.
    Jenkins told Musser that his car had been stolen the night before and asked him if
    he would say that he had been with him all night. Musser refused. Christine
    Nicholas also saw Jenkins in a grocery store that morning. He was looking at a
    newspaper, making a phone call, and attempting to sell his Buick. Nicholas loaned
    him $4 for gas. At around 10 o’clock that morning, Jenkins sold his car to Michael
    Brooks, a mechanic at a local Chevron station. Jenkins had explained that he
    needed the money so he could visit his sick mother in California. Another
    mechanic at the service station drove Jenkins to the Greyhound bus station later
    that morning.
    Jenkins awoke the next day on the Greyhound bus in Houston and was
    ejected from the bus because his fare was used up. He then hitchhiked from
    Houston to Phoenix, then to San Diego and Los Angeles. Jenkins was first
    identified as a suspect in Hogeland’s disappearance by Officer Mike Weems of the
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    Hoover Police Department on April 19. Weems ate dinner at the Riverchase
    Omelet Shoppe just about every day and had talked with Hogeland just as often.
    He also knew Jenkins from the restaurant. Weems learned of Hogeland’s
    disappearance from the other waitresses. Remembering how Jenkins often talked to
    Hogeland and passed her notes, 2 he gave Jenkins’s name to the missing persons
    investigator. The investigator also learned that a red Mazda RX-7 sports car, which
    had been reported stolen from the service station where Jenkins worked, had been
    recovered on I-459.
    The afternoon of April 21, a truck driver who had happened to stop on I-59
    near mile marker 151 discovered Hogeland’s body off the side of the road. She was
    naked, wearing only a watch, and was so badly decomposed that the body had to
    be identified by dental records. From the fractured hyoid bone, it was determined
    that she was manually strangled to death. Also found at the scene were Hogeland’s
    apron, shoes, bra, panties, pants, and hair net, as well as some beer cans, a Mazda
    RX-7 owner’s manual, and other items later determined to have come from the red
    Mazda. Her necklace and rings were never found.
    Alabama authorities issued a warrant for Jenkins’s arrest and also obtained a
    federal fugitive warrant. An FBI agent arrested Jenkins on May 1 in front of his
    2
    The jury was not permitted to hear, and the record does not reveal, what exactly Jenkins had
    said to Hogeland that made Officer Weems suspect him in her disappearance.
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    uncle’s house in Wilmington, California. Jenkins’s uncle later gave the police three
    bags of Jenkins’s personal effects. Fibers recovered from Hogeland’s body and
    clothing matched those of the Mazda, and hairs matching Hogeland’s were found
    in the Mazda. Similarly, fibers from Jenkins’s clothing placed him in the Mazda,
    and fibers of his jeans were found on Hogeland’s apron. A bootprint near
    Hogeland’s body matched a combat boot from among the belongings Jenkins’s
    uncle gave to the police, and Jenkins’s roommate said the boots looked just like
    those that Jenkins wore.
    A business card like those that had been in the Mazda’s glove box,
    belonging to an owner of the Mazda, was recovered from Jenkins’s wallet after his
    arrest in California. Later, Jenkins’s cellmate in the Alabama jail reported that
    Jenkins told him “he had done the crime” and was worried that the couple from the
    gas station would identify him or that the police would find his fingerprint on a
    beer can at the scene. A St. Clair County grand jury indicted Jenkins for capital
    murder.
    B.   The Trial and Sentencing
    Jenkins was represented at trial in 1991 by attorneys Douglas Scofield and
    Stan Downey. Scofield, the lead attorney, had been practicing criminal defense in
    Birmingham since 1984 but had never before tried a capital murder case. Jenkins’s
    landlord and his grandmother had arranged the referral and representation before
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    the court appointed him. Scofield agreed to the appointment on the condition that a
    St. Clair County lawyer also be appointed. That lawyer was Downey, who had
    more experience than Scofield but whose capital experience was limited to one
    case that had not gone to trial. The two attorneys had agreed that Downey would
    be responsible for jury selection, but Scofield eventually took over during the voir
    dire. Per their agreement, Scofield was responsible for the guilt-phase trial,
    although Downey participated by interviewing Jenkins several times. Scofield also
    met with Jenkins around a dozen times. Jenkins had told him about his background
    and childhood, including the fact that he had had a difficult childhood and had
    lived on the streets since age 11.
    Throughout the weeklong trial, Scofield pursued an outright acquittal. In
    particular, he challenged Harris’s identification of Jenkins as the man who drove
    away with Hogeland, and he challenged the medical examiner’s opinions about the
    time and cause of Hogeland’s death. In his closing argument, Scofield took a wide-
    ranging approach to undermining the State’s wholly circumstantial case against
    Jenkins. He attacked the State’s timeline of the crime, questioning whether Jenkins
    in his intoxicated state would have had the time and the ability to leave Nicholas’s
    house, steal the Mazda, and abduct and kill Hogeland. He reminded the jury of the
    weakness of Harris’s identification of Jenkins and the Coes’ identification of the
    woman in the car. He pointed out that no physical evidence definitively linked
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    Jenkins to the Mazda, to Hogeland’s body, or to her jewelry, which was never
    recovered. And he argued that the evidence provided no plausible motive for
    Jenkins to have kidnapped, robbed, or killed Hogeland. In sum, he urged the jury
    to find reasonable doubt and acquit Jenkins. At the very least, he argued, they
    should find that the State failed to prove Jenkins’s intent to rob and kidnap
    Hogeland, which were necessary to convict Jenkins of capital murder. He further
    argued that, if the jury thought Jenkins killed Hogeland as a crime of passion, they
    could convict him only of manslaughter. The jury deliberated for three hours and
    fifteen minutes before convicting Jenkins of capital murder, Ala. Code § 13A-5-
    40(a)(1) & (2), i.e., murder committed in the course of kidnapping and robbery.
    The penalty phase took place that same afternoon. A week before trial,
    Scofield and Downey had discussed the penalty phase, and Scofield understood
    that Downey would be responsible for handling the penalty phase. Nonetheless, the
    witness who was present to testify on Jenkins’s behalf during the penalty phase
    was better acquainted with Scofield, so Downey suggested that afternoon that
    Scofield conduct the direct examination. Scofield urged Downey to interview the
    witness quickly and prepare to examine him, and Downey did so.
    Downey handled the penalty presentation to the jury. The State did not
    present any additional aggravation evidence, resting on the evidence presented
    during the guilt phase. One witness, Lonnie Seal, testified on Jenkins’s behalf in
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    order, in Downey’s words, to “reveal another side of Mark Jenkins to you that you
    don’t know anything about.” Seal had met Jenkins in Fontana, California, in 1988
    when they both worked at the same garage. Seal and his wife became friends with
    Jenkins, and he visited in their home. When the Seals decided to move to Alabama
    a few months later, Jenkins agreed to help with their move and to live with the
    Seals in Alabama for a time. It took Lonnie Seal several weeks to find a job, but
    Jenkins found a job in two days and contributed toward the family’s rent and
    groceries. Jenkins continued to visit the Seals after he moved into his own home,
    and he would always bring a small gift for and play with the Seals’ infant son.
    Downey’s closing argument to the jury requested a sentence of life without
    parole. Downey reminded the jurors that they had agreed during voir dire that
    death was not always the appropriate punishment for homicide. Quoting the Bible,3
    he reminded the jury that the Old Testament permitted capital punishment only
    when supported by the testimony of two or three eyewitnesses, whereas in this case
    there had been only circumstantial evidence. He asserted from Seal’s testimony
    that “Mark had a side of him that was generous, that was giving, and that was
    3
    “If anyone kills a person, the murderer shall be put to death on the evidence of witnesses. But
    no person shall be put to death on the testimony of one witness.” Numbers 35:30 (ESV). Downey
    also paraphrased Deuteronomy 17:6 as “On the evidence of two witnesses or three witnesses, he
    is [sic] shall be put to death. He shall not be put to death on the evidence of one witness.”
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    kind,” and argued that the deterrent and retributive purposes of capital punishment
    would not be served in this case.
    The jury deliberated for 50 minutes before returning its nonbinding
    recommendation of death by a vote of 10 to 2. See Ala. Code § 13A-5-46(e) (1981)
    (amended 2017 to make jury’s verdict binding). After a separate hearing, the court
    found the two statutory aggravating factors for which the State had argued: that the
    murder was committed during the commission of a robbery, and that it was
    committed during the commission of a kidnapping. See Ala. Code § 13A-5-49(4).
    The court also found two statutory mitigating factors: that Jenkins had no
    significant history of prior criminal activity, and his age at the time of the crime
    (21). See
    id. § 13A-5-51(1),
    (7). The court considered but rejected the statutory
    mitigation that, due to his consumption of alcohol, Jenkins’s capacity to appreciate
    the criminality of his conduct or to conform his conduct to the requirements of law
    was substantially impaired. See
    id. § 13A-5-51(6).
    The court found that the
    aggravating circumstances outweighed the mitigating circumstances and, in
    accordance with the jury’s recommendation, imposed a sentence of death.
    C.     The State and Federal Post-Conviction Proceedings
    On direct appeal, the Alabama Court of Criminal Appeals affirmed Jenkins’s
    conviction and death sentence. Jenkins v. State, 
    627 So. 2d 1034
    (Ala. Ct. Crim.
    App. 1992), aff’d, 
    627 So. 2d 1054
    (Ala. 1993), cert. denied, 
    511 U.S. 1012
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    (1994). In 1995, Jenkins filed his first petition for state postconviction relief, Ala.
    R. Crim. P. 32, 4 alleging, among many other things, that he received ineffective
    assistance of counsel during his penalty phase. The Rule 32 trial court conducted a
    three-day hearing at which evidence was presented about the performance of
    Jenkins’s attorneys.
    Scofield testified about the representation that he and Downey provided. In
    relevant part, Scofield asserted that he and Downey had “decided that [developing
    mitigation for the penalty phase] would be something that Stan [Downey] would
    handle.” Downey later told Scofield that he hadn’t done any such investigation, but
    Scofield admitted that, “[a]part from what he has told me, I don’t know what he
    has done.” Scofield testified that Downey “didn’t appear prepared” for the penalty
    phase, based on Downey’s last-minute suggestion that Scofield examine Seal since
    he had talked with him before.
    In preparation for the penalty phase, Scofield himself did not interview any
    member of Jenkins’s family, but he did not know whether Downey interviewed
    any family members. Scofield did interview Jenkins’s landlord and some other
    acquaintances but did not do so specifically for the purpose of developing
    4
    “Subject to the limitations of Rule 32.2, any defendant who has been convicted of a criminal
    offense may institute a proceeding in the court of original conviction to secure appropriate relief
    on the ground that . . . [t]he constitution of the United States or of the State of Alabama requires
    a new trial, a new sentence proceeding, or other relief. . . .” Ala. R. Crim. P. 32.1.
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    mitigation. He had met with Jenkins around a dozen times, and Jenkins had told
    him his life story including his experience of abuse as a child. In hindsight,
    Scofield said he had a “lack of appreciation of mitigating circumstances.” He
    repeatedly denied in his Rule 32 testimony that his omissions during the penalty
    phase were strategic: “I didn’t understand what I was doing. . . . I just didn’t
    understand what I needed to do.”
    For reasons that remain unclear, Downey—who is since deceased—did not
    testify or submit an affidavit in the Rule 32 proceeding. Scofield answered,
    “Obviously not,” when asked whether he had personal knowledge of everything
    Downey may or may not have done to prepare for the penalty phase. The record of
    the extent of Downey’s pretrial preparation is thus limited to Downey’s detailed
    fee declaration, which he submitted to the State of Alabama in documentation of
    the compensation due him as appointed counsel. See Ala. Code § 15-12-21. In it,
    Downey reported that he spent 71 hours 5 on out-of-court preparation for trial. The
    report details 35 hours of interviews with Jenkins in 18 separate visits to the jail
    over the course of 17 months, as well as one substantive conversation with
    Jenkins’s grandmother. 6
    5
    In Jenkins’s state postconviction appeal, the Alabama Court of Criminal Appeals erroneously
    stated that Downey’s fee declaration reports 171 hours of pretrial preparation. See 
    Jenkins, 972 So. 2d at 137
    . We discuss the effect of this discrepancy infra note 7.
    6
    The state appellate court also noted that Downey had moved for a continuance in October 1989
    so that he could conduct “[f]urther discovery and investigation (including a possible trip to
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    The Rule 32 trial court also heard testimony from four family members and
    one friend of Jenkins’s. The family members presented for the first time a stark
    depiction of Jenkins as an unloved and abused child in California. Jenkins’s older
    brother Michael Jenkins testified that all of his siblings have different fathers and
    that his parents often used drugs and fought. Michael testified that Jenkins was
    beaten frequently as a child by his stepfather, if not every day then every other day
    or every three days. Jenkins was beaten all over his body with a variety of
    implements. Michael was beaten too. Jenkins’s stepfather would lock Jenkins in
    his bedroom for a couple of hours at a time, sometimes without dinner. Some of
    the beatings were prompted by Jenkins’s bedwetting or soiling. Michael testified
    that Jenkins’s stepfather sometimes made Jenkins wear his soiled underwear on his
    head and even forced him to eat his own feces a few times. Michael testified that
    Jenkins’s bladder and bowel control problems began after a camping trip he took
    with his stepfather and stepgrandfather.
    Michael testified that, as children, he and Jenkins were made to work on car
    engines late into the night and to shovel horse manure daily. The family moved
    frequently and the children attended many different schools as a result. Michael
    testified that he was Jenkins’s only friend as a child and that Jenkins did poorly in
    California).”
    Id. We note
    that Scofield had orally suggested to the trial court in September 1989
    that more time might be needed with respect to “evidence about the defendant” and witnesses in
    California, as well as possible psychological evaluation.
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    school. Jenkins began running away from home as a young teenager and lived with
    various other family members or on the streets. Michael said that Jenkins was a
    good brother to him and had asked him to testify at his trial, but he never heard
    from his attorneys or found out when the trial was. Michael admitted to having
    cognitive and memory problems due to a head injury years earlier.
    Jenkins’s cousin Tammy Pitts testified that, as an infant, Jenkins’s mother
    beat and neglected him, leaving him dirty and in soiled diapers. His stepfather also
    beat Jenkins daily until he left home at age 13, sometimes bruising him so badly
    that he was laid up in bed for days or weeks. Jenkins had problems with
    bedwetting and soiling, and his stepfather made him wear soiled clothes to school.
    Jenkins would be locked in his filthy bedroom around the clock except to attend
    school and do chores. He was usually not allowed to eat dinner with the rest of the
    family and subsisted on scraps and dog food. The entire family belittled Jenkins
    because his biological father was Hispanic and his complexion was therefore
    darker. Jenkins’s parents drank a lot and used drugs every day. Pitts knew these
    things because she had daily contact with the family and lived with them off and
    on, and Jenkins lived with her for a time after he ran away from home. No one had
    contacted her about testifying at Jenkins’s trial.
    Jenkins’s second cousin Betty DeLavega testified that her relationship with
    Jenkins was like that of an aunt. She lived with the Jenkins family for five months
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    when Jenkins was 10 or 11. She saw Jenkins’s stepfather slap Jenkins “[q]uite a
    few times,” and once, he made Jenkins eat his own feces. DeLavega testified that
    Jenkins’s parents used drugs nearly every day and withheld affection from Jenkins
    and Michael. No one contacted her about Jenkins’s trial; Jenkins’s grandmother
    had asked her to testify in the Rule 32 hearing about any abuse she had witnessed.
    Jenkins’s grandmother Doris Wagoner testified that while Jenkins’s mother
    was pregnant with him, her husband was in prison and she drank and took drugs.
    When Jenkins was born, his mother initially put him up for adoption, then changed
    her mind weeks later. Jenkins was a lethargic infant and his mother cared more
    about partying than about her children. Wagoner testified that she heard of
    Jenkins’s mistreatment as a child but didn’t see it. She could tell from the way that
    Jenkins feared his stepfather that he was being abused, and she knew he slept in a
    filthy bed. After Jenkins was arrested for murder, Wagoner spoke with Scofield,
    who asked for money relating to his representation of Jenkins. She did not
    remember whether she talked with Scofield about Jenkins’s background. She could
    not remember why she didn’t testify at the trial; she might have been ill, but she
    was probably busy.
    Sherry Seal, the wife of Lonnie Seal, who had testified in the penalty phase
    of the trial, testified that Jenkins was respectful and generous and that she trusted
    him with her children. She related how he supported her family after moving to
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    Alabama, giving them “pretty much” his entire paycheck. She said she would still
    feel safe around Jenkins. Two jailers also testified that Jenkins was a respectful,
    courteous, model inmate who never complained or caused any problems.
    Jenkins also introduced medical, school, and juvenile court records from his
    childhood. The medical records document his premature birth and his mother’s
    intention to give him up for adoption. The school records reflect a struggling
    student who was repeatedly promoted to the next grade because of his age, despite
    serious academic difficulties, chronic truancy, and frequent school changes. The
    juvenile court records document Jenkins’s placement in juvenile hall starting at age
    14, following repeated acts of grand theft auto and running away.
    The Rule 32 hearing concluded with the testimony of two psychologists
    about Jenkins’s history of psychological trauma stemming from his childhood
    abuse. The defense expert, Dr. David Lisak, had met with Jenkins three times and
    interviewed a dozen of his family members, family friends, and associates. Dr.
    Lisak testified that the pervasive abuse and neglect in Jenkins’s childhood impaired
    his ability to cope with trauma as an adult. He opined that Jenkins’s childhood
    abuse adversely affected his cognitive and emotional development and other
    abilities. He described how Jenkins had been neglected as an infant and sexually
    abused by his grandfather at age four, which led to a lifetime of bladder and bowel
    dysfunction. He also discussed the hypothesis that children who are abused are at
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    greater risk for perpetrating violence later in life, but he acknowledged there would
    have been other causative factors in Jenkins’s case. Dr. Lisak described Jenkins’s
    intellectual capacity as “somewhat borderline,” though he did not perform any
    testing of his own.
    The State’s expert, Dr. Karl Kirkland, had met with Jenkins for several hours
    and administered several tests. On the Wechsler Adult Intelligence Scale, Jenkins
    “scored in the range of borderline intellectual functioning which is between mild
    mental retardation and low average intellectual functioning” with an overall IQ of
    76. Dr. Kirkland agreed that Jenkins had been “reared in a chaotic dysfunctional
    family” and generally agreed with Dr. Lisak’s assessment of the negative effects of
    childhood trauma.
    The court considered all of this evidence before denying Rule 32 relief in
    full. As relevant here, it found that some of the evidence about the severity of
    abuse that Jenkins suffered as a child was not credible. It further found that Jenkins
    suffered no prejudice from any deficient performance by his penalty-phase counsel
    because the aggravating circumstances outweighed any additional mitigating
    evidence Downey might have adduced.
    The Alabama Court of Criminal Appeals affirmed the denial of Rule 32
    relief. Jenkins v. State, 
    972 So. 2d 111
    (Ala. Ct. Crim. App. 2004). In relevant part,
    the appeals court rejected Jenkins’s ineffective assistance claim, finding that
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    counsel reasonably chose to pursue a penalty-phase strategy of residual doubt and
    good character.
    Id.
    at 147.
    It explained that the new evidence was self-
    contradictory in that it asserted that childhood abuse would have made Jenkins a
    violent adult yet also asserted that Jenkins was meek and mild.
    Id. The appeals
    court also agreed with the lower court’s conclusion that Jenkins suffered no
    prejudice from any error by his counsel because the aggravating circumstances still
    outweighed any new mitigating ones.
    Id. at 148.
    The court also noted that evidence
    about Jenkins’s good behavior in jail awaiting trial was “minimally mitigating” and
    would not have affected the sentence.
    Id. at 149.
    Because the Supreme Court’s decision in Atkins v. Virginia7 had issued
    during the pendency of the Rule 32 appeal, the Alabama appeals court ordered
    supplemental briefing on the possible impact of Atkins upon Jenkins’s sentence.
    Jenkins asked the court to stay the proceedings and conduct an evidentiary hearing
    after the Alabama legislature enacted a statute about executing the mentally
    retarded or, in the alternative, to vacate his sentence and remand after the Alabama
    legislature acted. He later asserted that he is mentally retarded and therefore
    ineligible for the death penalty. The appeals court proceeded to reject Jenkins’s
    Atkins claim on the merits because the record established that his IQ was 76 and
    7
    
    536 U.S. 304
    , 321 (2002) (holding that the execution of mentally retarded offenders violates the
    Eighth Amendment). The rule announced in Atkins is retroactive to cases on collateral review. In
    re Holladay, 
    331 F.3d 1169
    , 1172–73 (11th Cir. 2003).
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    that he maintained relationships and employment.
    Id. at 155.
    The Alabama
    Supreme Court summarily affirmed, in relevant part. Ex parte Jenkins, 
    972 So. 2d 159
    , 165 (Ala. 2005), remanded to 
    972 So. 2d 165
    (Ala. Ct. Crim. App. 2005)
    (juror misconduct claim), cert. denied, 
    552 U.S. 1167
    (2008).
    In 2008, Jenkins filed his first petition for a writ of habeas corpus in federal
    court pursuant to 28 U.S.C. § 2254. The federal proceedings were stayed for
    several years while Jenkins pursued additional, unrelated Rule 32 relief in the state
    courts, ultimately unsuccessfully. In the district court, Jenkins moved for an
    evidentiary hearing on his Atkins claim. After reviewing the state court record,
    with a focus on the Rule 32 testimony of Drs. Lisak and Kirkland, the district court
    denied the motion in 2015. Noting that our Circuit has accepted the State of
    Alabama’s definition of mental retardation following Atkins, the court found that
    Jenkins is not intellectually disabled under that standard. In a 347-page order, the
    district court also denied relief on all of Jenkins’s claims including ineffective
    assistance of counsel during the penalty phase and affirmed as reasonable the state
    court’s conclusion that Jenkins failed to establish prejudice from any error by his
    counsel. The district court later denied reconsideration and a certificate of
    appealability.
    Jenkins now appeals. Our Court granted Jenkins a certificate of
    appealability, 28 U.S.C. § 2253(c), on two issues:
    20
    Case: 17-12524     Date Filed: 06/29/2020    Page: 21 of 81
    1)     Whether the district court erred in denying Appellant’s claim
    that his trial counsel rendered ineffective assistance of counsel in the
    investigation and presentation of mitigating evidence during the
    penalty phase of Appellant’s 1991 trial; and
    2)     Whether the district court erred in denying Appellant’s claim
    that he is intellectually disabled and ineligible for the death penalty
    under Atkins v. Virginia, 
    536 U.S. 304
    (2002).
    II.    STANDARDS OF REVIEW
    We review the denial of a § 2254 petition for a writ of habeas corpus de
    novo. Morrow v. Warden, Ga. Diagnostic Prison, 
    886 F.3d 1138
    , 1146 (11th Cir.
    2018). Yet, the Antiterrorism and Effective Death Penalty Act of 1996 (AEDPA)
    also governs this appeal, which establishes a “highly deferential standard for
    evaluating state-court rulings, [and] demands that state-court decisions be given the
    benefit of the doubt.” Cullen v. Pinholster, 
    563 U.S. 170
    , 181 (2011) (quoting
    Woodford v. Visciotti, 
    537 U.S. 19
    , 24 (2002) (per curiam)). Thus, under AEDPA,
    our review of a final state habeas decision is greatly circumscribed, and we cannot
    grant a state petitioner habeas relief on any claim that was adjudicated on the
    merits in state court unless the state court’s adjudication of the claim:
    (1) resulted in a decision that was contrary to, or involved an
    unreasonable application of, clearly established Federal law, as
    determined by the Supreme Court of the United States; or
    (2) resulted in a decision that was based on an unreasonable
    determination of the facts in light of the evidence presented in the
    State court proceeding.
    28 U.S.C. § 2254(d)(1)–(2).
    21
    Case: 17-12524     Date Filed: 06/29/2020    Page: 22 of 81
    “[C]learly established Federal law” means “the holdings, as opposed to the
    dicta, of [the Supreme] Court’s decisions as of the time of the relevant state-court
    decision.” Williams v. Taylor, 
    529 U.S. 362
    , 412 (2000). “[W]hen the last state
    court to decide a prisoner’s federal claim explains its decision on the merits in a
    reasoned opinion . . . a federal habeas court simply reviews the specific reasons
    given by the state court and defers to those reasons if they are reasonable.” Wilson
    v. Sellers, 
    138 S. Ct. 1188
    , 1192 (2018). For a state-court decision to be “contrary
    to” clearly established federal law, the state court must have “applie[d] a rule
    different from the governing law set forth in [Supreme Court] cases, or if it decides
    a case differently than [the Supreme Court] ha[s] done on a set of materially
    indistinguishable facts.” Bell v. Cone, 
    535 U.S. 685
    , 694 (2002). An “unreasonable
    application” of federal law occurs “if the state court correctly identifies the
    governing legal principle from [the Supreme Court’s] decisions but unreasonably
    applies it to the facts of the particular case.”
    Id. To be
    clear, “an unreasonable
    application of federal law is different from an incorrect application of federal law.”
    
    Williams, 529 U.S. at 410
    . “Indeed, ‘a federal habeas court may not issue the writ
    simply because that court concludes in its independent judgment that the relevant
    state-court decision applied clearly established federal law erroneously or
    incorrectly.’” Renico v. Lett, 
    559 U.S. 766
    , 773 (2010) (quoting 
    Williams, 529 U.S. at 411
    ). Rather, the state court’s application of federal law “must be ‘objectively
    22
    Case: 17-12524     Date Filed: 06/29/2020    Page: 23 of 81
    unreasonable.’ This distinction creates ‘a substantially higher threshold’ for
    obtaining relief than de novo review.”
    Id. (quotations omitted);
    White v. Woodall,
    
    572 U.S. 415
    , 419 (2014) (explaining that, for purposes of § 2254(d)(1), the State’s
    court’s application of clearly established federal law must be “‘objectively
    unreasonable,’ not merely wrong; even ‘clear error’ will not suffice” (quoting
    Lockyer v. Andrade, 
    538 U.S. 63
    , 75 (2003))).
    A state court’s decision is reasonable “so long as ‘fairminded jurists could
    disagree’ on the correctness of the state court’s decision.” Harrington v. Richter,
    
    562 U.S. 86
    , 101 (2011) (quoting Yarborough v. Alvarado, 
    541 U.S. 652
    , 664
    (2004)). “[E]ven a strong case for relief does not mean the state court’s contrary
    conclusion was unreasonable.”
    Id. at 102.
    Rather, a prisoner must show that the
    state court’s ruling “was so lacking in justification that there was an error well
    understood and comprehended in existing law beyond any possibility for
    fairminded disagreement.”
    Id. at 103.
    In addition, “a determination of a factual issue made by a State court shall be
    presumed to be correct,” and the prisoner bears “the burden of rebutting the
    presumption of correctness by clear and convincing evidence.” 28 U.S.C.
    § 2254(e)(1). “This deference requires that a federal habeas court more than simply
    disagree with the state court before rejecting its factual determinations. Instead, it
    must conclude that the state court’s findings lack even fair support in the record.”
    23
    Case: 17-12524     Date Filed: 06/29/2020   Page: 24 of 
    81 Smith & H. v
    . Comm’r, Ala. Dep’t of Corr., 
    924 F.3d 1330
    , 1337 (quoting Rose v.
    McNeil, 
    634 F.3d 1224
    , 1241 (11th Cir. 2011)). When a federal habeas court
    makes a factual finding as part of its habeas determination, we review for clear
    error, which is a “highly deferential” standard of review. Thomas v. Allen, 
    607 F.3d 749
    , 752 (11th Cir. 2010) (quoting Holton v. City of Thomasville Sch. Dist.,
    
    425 F.3d 1325
    , 1350 (11th Cir. 2005)). “A finding is ‘clearly erroneous’ when
    although there is evidence to support it, the reviewing court on the entire evidence
    is left with the definite and firm conviction that a mistake has been committed.”
    United States v. U.S. Gypsum Co., 
    333 U.S. 364
    , 395 (1948).
    III.   DISCUSSION
    A.     Ineffective Assistance of Counsel
    A prisoner alleging that he received ineffective assistance of counsel in
    violation of the Sixth Amendment must establish two elements. Strickland v.
    Washington, 
    466 U.S. 668
    , 687 (1984). “First, the defendant must show that
    counsel’s performance was deficient.”
    Id. Review of
    counsel’s actions is “highly
    deferential” and “a court must indulge a strong presumption that counsel’s conduct
    falls within the wide range of reasonable professional assistance.”
    Id. at 689.
    Additionally, “every effort [must] be made to eliminate the distorting effects of
    hindsight, to reconstruct the circumstances of counsel’s challenged conduct, and to
    evaluate the conduct from counsel’s perspective at the time.”
    Id. In other
    words,
    24
    Case: 17-12524     Date Filed: 06/29/2020   Page: 25 of 81
    the petitioner must show “that counsel made errors so serious that counsel was not
    functioning as the ‘counsel’ guaranteed the defendant by the Sixth Amendment.”
    Id. at 687.
    “Second, the defendant must show that the deficient performance prejudiced
    the defense.”
    Id. Prejudice occurs
    when there is a reasonable probability that, “but
    for counsel’s unprofessional errors, the result of the proceeding would have been
    different.”
    Id. at 694.
    “When a defendant challenges a death sentence . . . the
    question is whether there is a reasonable probability that, absent the errors, the
    sentencer—including an appellate court, to the extent it independently reweighs
    evidence—would have concluded that the balance of aggravating and mitigating
    circumstances did not warrant death.”
    Id. at 695.
    “The likelihood of a different
    result must be substantial, not just conceivable.” 
    Harrington, 562 U.S. at 112
    . In
    determining whether there is a reasonable probability of a different result, a court
    must “consider ‘the totality of the available mitigation evidence—both that
    adduced at trial, and the evidence adduced in the habeas proceeding’—and
    ‘reweig[h] it against the evidence in aggravation.’” Porter v. McCollum, 
    558 U.S. 30
    , 41 (2009) (quoting 
    Williams, 529 U.S. at 397
    –98).
    “Surmounting Strickland’s high bar is never an easy task.” 
    Harrington, 562 U.S. at 105
    (quoting Padilla v. Kentucky, 
    559 U.S. 356
    , 371 (2010)). Thus,
    “[e]stablishing that a state court’s application of Strickland was unreasonable
    25
    Case: 17-12524      Date Filed: 06/29/2020   Page: 26 of 81
    under § 2254(d) is all the more difficult” because “[t]he standards created by
    Strickland and § 2254(d) are both ‘highly deferential’ and when the two apply in
    tandem, review is ‘doubly’ so.”
    Id. (internal citations
    omitted).
    To be clear, “whether defense counsel’s performance fell below Strickland’s
    standard” is not the question before a federal habeas court reviewing a state court’s
    decision under § 2254.
    Id. at 101.
    As the Supreme Court has cautioned:
    Were that the inquiry, the analysis would be no different than if, for
    example, this Court were adjudicating a Strickland claim on direct
    review of a criminal conviction in a United States district court. Under
    AEDPA, though, it is a necessary premise that the two questions are
    different . . . [for] [a] state court must be granted a deference and
    latitude that are not in operation when the case involves review under
    the Strickland standard itself.
    Id. Accordingly, where,
    as here, Ҥ 2254(d) applies, the question is not whether
    counsel’s actions were reasonable. The question is whether there is any reasonable
    argument that counsel satisfied Strickland’s deferential standard.”
    Id. at 105
    (emphasis added). Consequently, “[f]ederal habeas courts must guard against the
    danger of equating unreasonableness under Strickland with unreasonableness
    under § 2254(d).”
    Id. With these
    reviewing principles in mind, we discuss each of
    Strickland’s elements in turn.
    1.     Deficient Performance
    Jenkins argues that his counsel performed deficiently by failing to
    “investigate compelling mitigating evidence or develop a penalty-phase theory.”
    26
    Case: 17-12524     Date Filed: 06/29/2020    Page: 27 of 81
    The state court disagreed. It quoted decisions of our Court that hold that “there is
    no per se rule that evidence of a criminal defendant’s troubled childhood must
    always be presented as mitigating evidence.” 
    Jenkins, 972 So. 2d at 144
    (quoting
    Marek v. Singletary, 
    62 F.3d 1295
    , 1300 (11th Cir. 1995)). Noting that “Downey
    was in charge of the penalty phase” but “we do not have the benefit of Downey’s
    testimony as to what occurred and why,” it reviewed the trial record to find that
    “counsel argued residual doubt and Jenkins’s good character at the penalty phase.”
    Id. at 145–46.
    It concluded that “Downey’s decision to concentrate on reasonable
    doubt and to portray Jenkins as a good person was reasonable under the
    circumstances.”
    Id. at 147.
    Jenkins insists, however, that counsel’s failure to develop mitigating
    evidence about his childhood abuse was “not the product of strategy, but rather
    arose from ingnorance and inexeperiance [sic].” The problem for Jenkins is that,
    like the state courts, this Court also does not know what Downey did or why. The
    record is silent as to his thoughts and intentions as he prepared for the penalty
    phase. Given that Jenkins bore the burden of overcoming the strong presumption of
    competence and of proving Downey’s deficient performance, we are perplexed
    why Jenkins’s new counsel did not have Downey testify or submit an affidavit in
    the Rule 32 proceeding. See 
    Strickland, 466 U.S. at 687
    , 691 (“The defendant must
    show that counsel’s performance was deficient” and “inquiry into counsel’s
    27
    Case: 17-12524      Date Filed: 06/29/2020      Page: 28 of 81
    conversations with the defendant may be critical to a proper assessment of
    counsel’s investigation decisions, just as it may be critical to a proper assessment
    of counsel’s other litigation decisions.” ). Nor did Jenkins testify to the substance
    of his conversations with his counsel. “The reasonableness of a trial counsel’s acts,
    including lack of investigation or excluding character witnesses from the
    sentencing phase, depends ‘critically’ upon what information the client
    communicated to counsel.” Chandler v. United States, 
    218 F.3d 1305
    , 1324 (11th
    Cir. 2000) (en banc) (quoting 
    Strickland, 466 U.S. at 691
    ). There is simply no
    record evidence to support Jenkins’s central assertion that Downey made no
    tactical choices in his preparation for the penalty phase.
    Jenkins instead relies on Scofield’s Rule 32 testimony about how he and
    Downey prepared for the trial and sentencing. We acknowledge that Scofield
    repeatedly testified that he did not really know what he was doing and that he
    failed to make strategic choices with respect to mitigating circumstances and
    sentencing. But Scofield was equally clear that Downey—the more experienced
    lawyer—was in fact responsible for the penalty phase. And Scofield also
    repeatedly testified that he did not know what Downey may or may not have done
    to prepare. Furthermore, his lack of knowledge about Downey’s preparation was
    understandable. He and Downey were not colleagues who shared an office and
    28
    Case: 17-12524     Date Filed: 06/29/2020    Page: 29 of 81
    might reasonably be expected to know what the other was doing much of the time.
    Scofield and Downey did not even work in the same city.
    This case is unlike those in which we have found deficient performance
    where the record showed that counsel investigated insufficiently because he
    “waited until the eleventh hour” to begin preparing for the penalty phase while
    faced with “overwhelming evidence of guilt.” See, e.g., Johnson v. Sec’y, D.O.C.,
    
    643 F.3d 907
    , 932 (11th Cir. 2011). The limited record that Jenkins developed
    establishes that Downey spent at least 71 hours preparing for trial, spread out over
    17 months. The state court interpreted this sparse record as reflecting a penalty-
    phase strategy of residual doubt, the logical extension of Downey’s guilt-phase
    investigation of the evidence and Scofield’s pursuit at trial of an acquittal based on
    reasonable doubt. See 
    Jenkins, 972 So. 2d at 147
    . In such a situation, “[a] lawyer’s
    time and effort in preparing to defend his client in the guilt phase of a capital case
    continues to count at the sentencing phase.” Tarver v. Hopper, 
    169 F.3d 710
    , 715
    (11th Cir. 1999).
    We decline to dictate how many hours or how many sessions an attorney
    must spend interviewing his counsel in order to provide effective assistance. “No
    absolute rules dictate what is reasonable performance for lawyers.” 
    Chandler, 218 F.3d at 1317
    (citing 
    Strickland, 466 U.S. at 688
    –89). But even this limited record
    undermines Jenkins’s assertion that Downey prepared inadequately. Downey’s 71
    29
    Case: 17-12524        Date Filed: 06/29/2020        Page: 30 of 81
    hours of preparation included 35 hours of jailhouse conversations with Jenkins
    during 18 separate meetings. 8 According to Downey’s notes, Scofield was present
    for only five of those meetings (12 hours’ worth), leaving 23 hours over 13
    meetings between Jenkins and Downey alone. Downey’s notes reveal little about
    the content of those conversations beyond broad notations such as “evidence,
    witnesses, general status,” and discussions with Jenkins of the evidence and
    testimony against him were surely relevant to Downey’s penalty-phase strategy of
    residual doubt.
    But the record does not reveal that Downey knew or should have known that
    Jenkins’s childhood merited investigation beyond that which he may have done.
    The record shows that Downey developed enough of a rapport with Jenkins that,
    according to his fee declaration, he “g[ave a] Christmas gift [and] discuss[ed] how
    much to tell his family.” But how much Downey knew about Jenkins’s family
    background can only be guessed from Scofield’s Rule 32 hearing testimony.
    Scofield testified that he discussed Jenkins’s background during his dozen or so
    jailhouse meetings with him, and that Downey was present for some of those
    meetings. Scofield—and possibly Downey—learned that Jenkins experienced
    8
    We note that the state court clearly erroneously stated that Downey’s fee declaration
    documented 171 hours of pretrial preparation. See 
    Jenkins, 972 So. 2d at 137
    . However, the state
    court accurately stated that “he spent over 25 hours talking with Jenkins in more than 10 visits to
    the jail.”
    Id. That statement
    was not an unreasonable determination of the facts.
    30
    Case: 17-12524     Date Filed: 06/29/2020    Page: 31 of 81
    abuse as a child, that his stepfather was brutal, and that he lived on the streets and
    in juvenile institutions because of his brutal home life. It is against this backdrop
    that Downey’s presumptive “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
    .
    That assessment depends a great deal on what Jenkins told his counsel about
    his background. See
    id. But we
    do not know whether Downey was present when
    Scofield learned about Jenkins’s childhood abuse, nor what else Downey may have
    learned during his 13 solo discussions with Jenkins. Therefore, “given the absence
    of evidence in the record, we must assume counsel carried out his professional
    responsibility and discussed mitigation with his client.” 
    Chandler, 218 F.3d at 1324
    ; Burt v. Titlow, 
    571 U.S. 12
    , 17 (2013) (“It should go without saying that the
    absence of evidence cannot overcome the ‘strong presumption that counsel’s
    conduct [fell] within the wide range of reasonable professional assistance.’”
    Id. (alteration in
    original) (quoting 
    Strickland, 466 U.S. at 689
    )). We will not “turn
    that presumption on its head by giving [Jenkins] the benefit of the doubt where it is
    unclear what [Downey] did or did not do.” Williams v. Head, 
    185 F.3d 1223
    , 1235
    (11th Cir. 1999). We will not assume that Jenkins told Downey more than he told
    Scofield, and Scofield denied remembering that Jenkins told him about the severity
    or frequency of his stepfather’s physical abuse. He denied remembering Jenkins
    31
    Case: 17-12524     Date Filed: 06/29/2020    Page: 32 of 81
    telling him about being beaten daily, being locked in his room 24/7, or being
    forced to eat his feces. And there is no suggestion in the record that counsel knew
    or had reason to investigate the allegation of sexual abuse by his stepgrandfather.
    The record simply does not reflect that Jenkins told either of his lawyers about the
    severe abuse that some of the Rule 32 witnesses later described. We will not fault
    those lawyers for failing to present as mitigation this limited evidence that they
    may have reasonably believed to be unremarkable. See 
    Strickland, 466 U.S. at 691
    .
    To be sure, counsel’s failure “to discover all reasonably available mitigating
    evidence” may constitute deficient performance in some cases. Wiggins v. Smith,
    
    539 U.S. 510
    , 524 (2003) (quoting ABA Guidelines for the Appointment and
    Performance of Counsel in Death Penalty Cases § 11.4.1(C) (1989)). Our Court
    has identified deficient performance in several instances where counsel had good
    reason to investigate the defendant’s background but failed to do so. See 
    Morrow, 886 F.3d at 1147
    (collecting cases). But we assess “a particular decision not to
    investigate . . . for reasonableness in all the circumstances, applying a heavy
    measure of deference to counsel’s judgments.” 
    Strickland, 466 U.S. at 691
    . Thus,
    we have rejected a hard rule that counsel’s “strategic decisions can be considered
    reasonable only if they are preceded by a ‘thorough investigation.’” 
    Williams, 185 F.3d at 1237
    (quoting Rogers v. Zant, 
    13 F.3d 384
    , 387 (11th Cir. 1994)). Because
    we simply do not know why Downey chose not to investigate Jenkins’s childhood
    32
    Case: 17-12524     Date Filed: 06/29/2020    Page: 33 of 81
    more thoroughly, Downey is entitled to the presumption that this strategic decision
    was reasonable. See 
    Chandler, 218 F.3d at 1314
    n. 15 (en banc) (“An ambiguous
    or silent record is not sufficient to disprove the strong and continuing
    presumption.”).
    And though we have also rejected “a per se rule of ineffective assistance
    where counsel does not consult family members,” Holladay v. Haley, 
    209 F.3d 1243
    , 1252 (11th Cir. 2000), we note that Downey did not fail altogether to consult
    family members. Downey had at least one substantive conversation with Jenkins’s
    grandmother, and we know from her Rule 32 hearing testimony that she never
    witnessed Jenkins’s childhood abuse. Given the silence of the record and the strong
    presumption of competence to which Downey is entitled, we decline to hold as
    unreasonable the state court’s decision not to fault Downey for not doing more
    when Jenkins and his grandmother did not and could not, respectively, provide a
    basis for doing so. Cf. United States v. Pease, 
    240 F.3d 938
    , 941–92 (11th Cir.
    2001) (“we cannot say as a matter of law that reliance on a client’s statements is
    per se deficient performance”). Nor did Jenkins’s counsel have an absolute duty to
    put on abusive-childhood evidence, even if they knew of it. See 
    Chandler, 218 F.3d at 1319
    (“Counsel is not required to present every nonfrivolous defense; nor
    is counsel required to present all mitigation evidence, even if the additional
    mitigation evidence would not have been incompatible with counsel’s strategy.”);
    33
    Case: 17-12524     Date Filed: 06/29/2020    Page: 34 of 81
    Waters v. Thomas, 
    46 F.3d 1506
    , 1511 (11th Cir. 1995) (en banc) (“Our decisions
    are inconsistent with any notion that counsel must present all available mitigating
    circumstance evidence.”).
    Instead, we affirm as a reasonable application of Strickland the state court’s
    conclusion that Downey’s strategic decision to emphasize residual doubt was
    reasonable. See 
    Jenkins, 972 So. 2d at 147
    . In reaching this conclusion, the State
    court explained that residual doubt had been recognized as an effective strategy in
    the penalty phase of capital cases, citing cases from this Circuit, law review
    articles, and the American Law Institute’s model penal code. These sources
    provided guides (i.e. “prevailing professional norms”) from which the state court
    could measure whether Downey’s performance fell within the wide range of
    reasonable professional assistance contemplated by Strickland. See 
    Knowles, 556 U.S. at 123
    (“[B]ecause the Strickland standard is a general standard, a state court
    has even more latitude to reasonably determine that a defendant has not satisfied
    that standard.”); see also 
    Renico, 559 U.S. at 776
    (“Because AEDPA authorizes
    federal court’s to grant relief only when state courts act unreasonably, it follows
    that ‘[t]he more general the rule’ at issue—and thus the greater the potential for
    reasoned disagreement among fair-minded judges—‘the more leeway [state] courts
    have in reaching outcomes in case-by-case determinations.” (quoting 
    Yarborough, 541 U.S. at 664
    ))). Indeed, we have held that “residual doubt is perhaps the most
    34
    Case: 17-12524        Date Filed: 06/29/2020       Page: 35 of 81
    effective strategy to employ at sentencing.” 
    Chandler, 218 F.3d at 1320
    n.28.
    “[E]specially when—as in this case—the evidence of guilt was not overwhelming,
    we expect that petitioners can rarely (if ever) prove a lawyer to be ineffective for
    relying on this seemingly reasonable strategy to defend his client.”
    Id. at 1320
    (footnote omitted); see also 
    Tarver, 169 F.3d at 715
    –16 (collecting law review
    articles on the merits of residual-doubt strategy). Not only can such a strategy be
    constitutionally adequate, in some cases it may be “the most effective performance
    in defense to the death penalty.” 
    Tarver, 169 F.3d at 716
    .
    Accordingly, we cannot say that the state court’s determination that
    Downey’s manifest strategy of residual doubt satisfied Strickland’s deferential
    standard was objectively unreasonable under the circumstances. Jenkins’s case is
    precisely the sort where reminding the jury of the misgivings it may have held
    about the State’s case could have been effective. Scofield’s guilt-phase closing
    argument from that very morning, which explicitly emphasized doubt and the
    weakness of the State’s evidence, would have been fresh in the minds of the jury.9
    Although we are not questioning the jury’s guilty verdict or the sufficiency of the
    evidence, which are beyond the scope of our habeas review, we acknowledge that
    the State’s case against Jenkins was—as Downey reminded the jury during the
    9
    During the penalty phase of a capital case, “[e]vidence presented at the trial of the case may be
    considered insofar as it is relevant to the aggravating and mitigating circumstances without the
    necessity of re-introducing that evidence at the sentence hearing.” Ala. Code § 13A-5-45(c).
    35
    Case: 17-12524     Date Filed: 06/29/2020    Page: 36 of 81
    penalty phase—entirely circumstantial. Indeed, Scofield maintained post-
    conviction that the case for reasonable doubt was “[v]ery strong.” No one saw
    Jenkins commit either the murder or the robbery and kidnapping that elevated
    Hogeland’s murder to a capital crime. Scofield’s guilt-phase closing argument
    challenged the inferential leaps the State was asking the jury to make in finding
    that Jenkins committed these capital-predicate offenses and that he formed the
    intent to kill. This situation was not one where a guilt-phase strategy of acquittal—
    and therefore a penalty-phase strategy of residual doubt—was unreasonable in
    light of the evidence. Cf. 
    Johnson, 643 F.3d at 932
    –33 (deficient sentencing
    investigation where defendant had confessed to two murders).
    Thus, although Downey’s penalty-phase closing argument did not
    specifically invoke lingering doubt, it clearly reminded the jury of the entirely
    circumstantial nature of the State’s guilt-phase case. See 
    Chandler, 218 F.3d at 1320
    & n.6 (a strategy of “focus[ing] on obtaining an acquittal and then, at
    sentencing, on lingering doubt” is reasonable, even if counsel does not use the
    words “lingering doubt” or “residual doubt”). Downey closed this reminder by
    explaining to the jury how a foundational ancient legal system proscribed capital
    punishment in the absence of eyewitness testimony—the exact situation here. The
    state court found that Downey’s penalty-phase closing argument reflected a
    strategic “decision to concentrate on reasonable doubt,” see 
    Jenkins, 972 So. 2d at 36
                    Case: 17-12524        Date Filed: 06/29/2020         Page: 37 of 81
    147, a tactical choice entitled to a “strong presumption of correctness,” 
    Marek, 62 F.3d at 1300
    & n.3.
    Jenkins suggests other theories of mitigation that Downey might have more
    effectively pursued,10 but our deferential review under Strickland does not ask
    whether counsel could possibly or ideally have been more effective. “The test for
    ineffectiveness is not whether counsel could have done more.” 
    Waters, 46 F.3d at 1518
    . We do not ask whether an attorney’s representation “deviated from best
    practices or common custom,” and we should resist the temptation to second-guess
    an attorney with the benefit of our hindsight. 
    Richter, 562 U.S. at 105
    . Rather,
    Strickland asks only “whether, in light of all the circumstances, the identified acts
    or omissions were outside the range of professionally competent assistance.”
    
    Strickland, 466 U.S. at 690
    . And, because § 2254(d) applies, we ask only “whether
    there is any reasonable argument that counsel satisfied Strickland’s deferential
    standard.” 
    Harrington, 562 U.S. at 105
    .We conclude that the state court did not
    10
    In particular, Jenkins argues that his counsel should have presented “model prisoner”
    evidence. The state court noted, “Good conduct during pretrial incarceration is not necessarily a
    mitigating circumstance,” before finding that Jenkins had not met his burden of establishing that
    his counsel even had information about his conduct in jail. 
    Jenkins, 972 So. 2d at 149
    . We agree,
    and we decline to impose a requirement of sua sponte investigation of this kind in every capital
    case. Cf. 
    Williams, 529 U.S. at 396
    (finding deficient performance based in part on not returning
    a call from a prison ministry volunteer who offered to vouch for defendant’s good behavior in
    prison). “Surely, counsel is not required to call a witness to testify to facts such as lack of violent
    nature when the jury has rejected such an approach and has found that the defendant is guilty of
    murder.” Griffin v. Wainwright, 
    760 F.2d 1505
    , 1512 (11th Cir. 1985), vacated on other grounds,
    
    476 U.S. 1112
    (1986), reaff’d, 
    874 F.2d 1397
    (11th Cir. 1989).
    37
    Case: 17-12524     Date Filed: 06/29/2020    Page: 38 of 81
    unreasonably determine that Jenkins failed to establish objectively incompetent
    performance by his counsel during the penalty phase of his trial. Our inquiry is not
    “what the best lawyers would have done. Nor is the test even what most good
    lawyers would have done. We ask only whether some reasonable lawyer at the trial
    could have acted, in the circumstances, as defense counsel acted at trial. . . . We are
    not interested in grading lawyers’ performances.” White v. Singletary, 
    972 F.2d 1218
    , 1220–21 (11th Cir. 1992). And “[i]f fairminded jurists could reasonably
    disagree” about the reasonableness of counsel’s performance, “then habeas relief is
    due to be denied.” 
    Johnson, 643 F.3d at 932
    .
    2.    Prejudice
    Even if Jenkins had demonstrated that his counsel performed as no
    reasonable lawyer could have, he must also demonstrate prejudice—that is a
    “reasonable probability that, but for counsel’s unprofessional errors, the result of
    the proceeding would have been different.” 
    Strickland, 466 U.S. at 694
    . Given that
    the jury here recommended a sentence of death by the narrowest possible vote, 10
    to 2, Jenkins need establish only “a reasonable probability that at least one juror
    would have struck a different balance” between life and death. 
    Wiggins, 539 U.S. at 537
    . “A reasonable probability is a probability sufficient to undermine
    confidence in the outcome.” 
    Strickland, 466 U.S. at 694
    . As explained above, in
    measuring that probability here, we will “evaluate the totality of the available
    38
    Case: 17-12524        Date Filed: 06/29/2020        Page: 39 of 81
    mitigation evidence—both that adduced at trial, and the evidence adduced in the
    habeas proceeding in reweighing it against the evidence in aggravation.” 
    Williams, 529 U.S. at 397
    –98.
    We begin our analysis by clarifying what exactly Jenkins is arguing about
    prejudice. We do not know precisely which aggravating and mitigating factors the
    jury may have implicitly found before making its recommendation of death. The
    trial court found at sentencing two statutory aggravating factors: the robbery and
    the kidnapping of the victim. See Ala. Code § 13A-5-49(4). Because none of the
    mitigation evidence offered in the Rule 32 hearing bears on those factors, we see
    no reasonable probability that the aggravating factors would have been determined
    differently by the jury or the court. The court also found at sentencing two
    statutory mitigating factors: no significant history of prior criminal activity and
    age. See
    id. § 13A-5-51(1),
    (7). There was also strong evidence of Jenkins’s
    intoxication, which was a key part of Jenkins’s guilt-phase defense and could have
    supported a third mitigating factor, impaired capacity. See
    id. § 13A-5-51(6).
    11
    11
    The jury had heard evidence about all three of these statutory mitigators during the guilt phase
    of the trial. Downey’s penalty-phase opening statement reviewed for the jury all seven of the
    possible statutory mitigating factors, and the court also recited them in its jury instructions,
    reminding the jury that they could consider guilt-phase evidence as well as non-statutory
    mitigation. Jenkins has not established that there is a substantial probability that the jury’s
    recommendation would have been different had it been more explicitly reminded of Jenkins’s
    age, criminal history, and intoxication, given that the trial court, the Rule 32 trial court, and the
    state appellate court all explicitly considered those mitigators and found them outweighed by the
    aggravators.
    39
    Case: 17-12524        Date Filed: 06/29/2020      Page: 40 of 81
    Jenkins does not argue that the jury or the court would have found other statutory
    mitigators in light of the Rule 32 evidence. Rather, he contends that the jury might
    have found non-statutory mitigation based on Jenkins’s abusive childhood, low
    intelligence, or mental health problems that would have outweighed the
    aggravating factors. 12
    The Rule 32 trial court found that Jenkins had not demonstrated prejudice
    even assuming that counsel had performed deficiently. See 
    Jenkins, 972 So. 2d at 138
    . It concluded that he had not shown a reasonable probability that the sentencer
    “would have concluded that a weighing of the aggravating and mitigating
    circumstances did not warrant death” upon a reweighing of the evidence. See
    id. It emphasized
    the depravity of the crime and the aggravating circumstances and
    found “that none of [Jenkins’s] witnesses was credible and that they had
    exaggerated the level of abuse that Jenkins had been exposed to when he was [a]
    child.” See
    id. at 138,
    144. The state appellate court affirmed, declining to disturb
    the credibility determinations of the trial court.
    Id. at 142–44.
    Independently
    12
    Alabama law lists seven statutory mitigating circumstances, but states that mitigation “shall
    . . . not be limited to” those seven circumstances. Ala. Code § 13A-5-51. Further, “mitigating
    circumstances shall include any aspect of a defendant’s character or record and any of the
    circumstances of the offense that the defendant offers as a basis for a sentence of life
    imprisonment without parole instead of death, and any other relevant mitigating circumstances
    which the defendant offers as a basis for a sentence of life imprisonment without parole instead
    of death.”
    Id. § 13A-5-52.
    A jury may recommend a sentence of death only if it finds that “one or
    more aggravating circumstances . . . exist and that they outweigh the mitigating circumstances, if
    any.”
    Id. § 13A-5-46(e)(3).
                                                   40
    Case: 17-12524      Date Filed: 06/29/2020   Page: 41 of 81
    reweighing the evidence, it concluded that, “[g]iven the aggravating circumstances
    that were proven by the State and the facts surrounding Hogeland’s murder, we,
    like the circuit court, are confident that death was the appropriate punishment for
    Jenkins’s actions.”
    Id. at 148.
    In light of the state court’s credibility determination and our doubly
    deferential standard of review, the state court’s determination that Jenkins failed to
    establish prejudice was not contrary to, or an unreasonable application of,
    Strickland. Our review of this evidence does not show that it is likely that the jury
    would have concluded that death was not the appropriate punishment if it had
    heard the Rule 32 evidence. Much of the proffered mitigation evidence is, in our
    view, much less mitigating than Jenkins asserts. In particular, as the state court
    noted, the testimony of Jenkins’s older brother Michael was likely to have been a
    double-edged sword. See Evans v. Sec’y, Dep’t of Corr., 
    703 F.3d 1316
    , 1327
    (11th Cir. 2013) (en banc) (“it is reasonable to conclude that a defendant was not
    prejudiced when his mitigation evidence was a two-edged sword” (quoting
    Ponticelli v. Sec’y, Fla. Dep’t of Corr., 
    690 F.2d 1271
    , 1296 (11th Cir. 2012)).
    Michael was the closest relative to testify at the Rule 32 hearing and his testimony
    about the abuse Jenkins experienced should have been the most reliable, since he
    experienced much of the same physical abuse himself. The brothers shared the
    same filthy bedroom, received beatings from the same paddle, and were frequently
    41
    Case: 17-12524     Date Filed: 06/29/2020    Page: 42 of 81
    absent from school together. But Michael’s testimony contained some
    discrepancies, and he admitted to cognitive and memory problems. Perhaps
    Michael’s testimony would have made Jenkins appear more sympathetic in the
    eyes of the jury—but perhaps not. While Jenkins ran away from home and
    eventually committed murder, Michael responded to the same background by
    running away from home, graduating from high school, and providing health care
    for both the terminally ill and people with substance use disorders. It is possible
    that the jury could even have found Jenkins to be more culpable for not
    overcoming his difficult upbringing and to pose more of a danger of future
    violence.
    We also find reasonable the state court’s identification of other problems
    with the mitigating evidence Jenkins argues should have been presented. Hearing
    that evidence firsthand in the Rule 32 proceeding, the trial court found the
    testimony of the cousins less credible in light of the lack of physical abuse
    documented in the school health records. See 
    Jenkins, 972 So. 2d at 139
    (noting
    that school records observed a rash and gingivitis). It faulted Pitts in particular for
    purporting to have witnessed ongoing, severe abuse but taking only minimal,
    ineffective steps to obtain outside help. See
    id. It further
    noted that DeLavega and
    Wagoner actually testified that they never saw Jenkins beaten, and it noted all of
    the witnesses’ interest in getting Jenkins off death row. All of these factors would
    42
    Case: 17-12524     Date Filed: 06/29/2020    Page: 43 of 81
    likely have caused a reasonable jury to discount their testimony. See
    id. at 139–42.
    We must accept the trial court’s credibility determinations of the Rule 32
    witnesses. Consalvo v. Sec’y for Dep’t of Corrs., 
    664 F.3d 842
    , 845 (11th Cir.
    2011) (“Determining the credibility of witnesses is the province and function of the
    state courts, not a federal court engaging in habeas review. Federal courts have ‘no
    license to redetermine credibility of witnesses whose demeanor has been observed
    by the state trial court, but not by them.’” (quoting Marshall v. Lonberger, 
    459 U.S. 422
    , 434 (1983))). The credibility of a witness is a question of fact entitled to
    a presumption of correctness under AEDPA.
    Id. “In the
    absence of clear and
    convincing evidence, we have no power on federal habeas review to revisit the
    state court’s credibility determinations.” Bishop v. Warden, 
    726 F.3d 1243
    , 1259
    (11th Cir. 2013) (citing 
    Lonberger, 459 U.S. at 434
    ).
    The state court also noted that Wagoner testified that she was not available
    to testify at the trial, and it found that Seal’s testimony would have been
    cumulative to that of her husband. Thus, counsel’s failure to call those two
    witnesses could not have been prejudicial to Jenkins. See
    id. at 141,
    142. Neither of
    these conclusions involves an unreasonable determination of the facts. We agree
    that the Rule 32 testimony of Sherry Seal was substantially similar to the testimony
    of her husband Lonnie Seal that the jury heard during the penalty phase. Both
    testified about meeting Jenkins in California, Jenkins’s assistance with their move
    43
    Case: 17-12524     Date Filed: 06/29/2020   Page: 44 of 81
    to Alabama, and his residence with them in their Alabama home. Sherry added
    only that Jenkins sometimes wet his bed. It was not unreasonable for the state court
    to conclude that Sherry’s testimony was cumulative of her husband’s, and “a
    petitioner cannot satisfy the prejudice prong of the Strickland test with evidence
    that is merely cumulative of evidence already presented.” Rose v. McNeil, 
    634 F.3d 1224
    , 1243 (11th Cir. 2011).
    Further, the school, medical, and juvenile court records that Jenkins
    introduced in the Rule 32 proceeding have their own problems. As noted, they do
    not document or even corroborate the severe level of abuse alleged by some of the
    witnesses. Though these documents tell a sad story, they do not create a substantial
    likelihood that the jury would have recommended life. Although they portray
    Jenkins as a victim of truly unfortunate circumstances, they also show his unsavory
    delinquent behavior. That delinquency included a history of stealing cars, and
    given that the jury likely inferred that Jenkins stole the red Mazda, new
    information about his history of theft may not have been especially mitigating.
    Similarly, we agree with the state court that evidence of Jenkins’s compliant
    conduct in pretrial detention is “minimally mitigating” where there had been no
    evidence of jail misconduct as an aggravator. See 
    Jenkins, 972 So. 2d at 149
    ; cf.
    Skipper v. South Carolina, 
    476 U.S. 1
    , 5 & n.1 (1986) (good jail behavior is
    44
    Case: 17-12524     Date Filed: 06/29/2020    Page: 45 of 81
    “potentially mitigating” especially “[w]here the prosecution specifically relies on a
    prediction of future dangerousness in asking for the death penalty”).
    Jenkins argues that allowing the jury to see his experience of mental,
    emotional, and cognitive difficulties, compounded by years of abuse and neglect
    and considered alongside his mild character and good jail behavior as an adult,
    would have convinced them that Hogeland’s murder was an “aberration” that
    deserved a punishment less severe than death. That interpretation of Jenkins’s life
    story may be conceivable. But more than mere conceivability is required to
    establish prejudice: “The likelihood of a different result must be substantial, not
    just conceivable.” 
    Richter, 562 U.S. at 112
    (emphasis added). We do not find the
    state court’s decision that a different result was not substantially likely to be an
    unreasonable application of Strickland. As we have noted, we think it equally
    likely that the jury could have rejected this alternate narrative out of hand in light
    of having just convicted him of the violent murder of a young mother. We also
    think it possible that the jury could have viewed the murder as just one step in a
    logical progression of degeneracy that began with behavioral problems at school,
    continued through the juvenile court system, and escalated past grand theft auto
    into kidnapping and murder. Taken separately as well as together, the proffered
    evidence does not compel us to conclude that a verdict of life would have been
    substantially likely. Because fairminded jurists could disagree about the state
    45
    Case: 17-12524       Date Filed: 06/29/2020       Page: 46 of 81
    court’s conclusion about Strickland prejudice, we affirm the denial of habeas relief
    on this ground.
    B.      Intellectual Disability
    Jenkins argues that the district court erred when it denied his claim that he is
    intellectually disabled and ineligible for the death penalty under Atkins v. Virginia,
    
    536 U.S. 304
    (2002). The Supreme Court held in Atkins that executing an offender
    who has mental retardation 13 violates the Eighth Amendment’s ban on excessive
    punishments.
    Id. at 321.
    It defined mental retardation by quoting the American
    Association on Mental Retardation:
    Mental retardation refers to substantial limitations in present
    functioning. It is characterized by significantly subaverage intellectual
    functioning, existing concurrently with related limitations in two or
    more of the following applicable adaptive skill areas: communication,
    self-care, home living, social skills, community use, self-direction,
    health and safety, functional academics, leisure, and work. Mental
    retardation manifests before age 18.
    Id. at 308
    n.3. Alabama courts have followed that tripartite definition, adopting
    what they consider the “broadest” definition of mental retardation for Atkins
    purposes:
    [A] defendant, to be considered mentally retarded, must have
    significantly subaverage intellectual functioning (an IQ of 70 or
    below), and significant or substantial deficits in adaptive behavior.
    13
    In 2002, the Atkins Court followed prevailing convention in referring to “mentally retarded”
    offenders. We will use that now-disfavored term only when quoting or discussing older sources.
    Since 2014, the Supreme Court has exclusively used the terms “intellectually disabled person”
    and “person with intellectual disability.” See, e.g., Hall v. Florida, 
    572 U.S. 701
    , 704 (2014);
    Moore v. Texas, 
    139 S. Ct. 666
    , 672 (2019).
    46
    Case: 17-12524        Date Filed: 06/29/2020      Page: 47 of 81
    Additionally, these problems must have manifested themselves during
    the developmental period (i.e., before the defendant reached age 18).
    Ex parte Perkins, 
    851 So. 2d 453
    , 456 (Ala. 2002).
    The clinical evidence adduced during the Rule 32 hearing with respect to
    Jenkins’s intellectual ability was that his IQ was 76, reflecting “borderline
    intellectual functioning.” The record also included the report of the Lunacy
    Commission 14 which found that Jenkins was competent to stand trial, as well as
    Jenkins’s school and juvenile court records. The court also considered all the
    testimony it had heard about Jenkins and reviewed the transcript of his murder trial
    before rejecting Jenkins’s claim of mental retardation.
    On appeal, after reciting the Perkins standard, the Alabama Court of
    Criminal Appeals explained that Jenkins had not established mental retardation:
    Dr. Kirkland testified that he performed psychological tests on Jenkins
    and that Jenkins’s IQ was 76. There was evidence presented at
    Jenkins’s trial indicating that Jenkins maintained relationships with
    other individuals and that he had been employed by P.S. Edwards
    Landscaping Company, Cotton Lowe 76 Service Station, and
    Paramount Painting Company. The record fails to show that Jenkins
    meets the most liberal view of mental retardation adopted by the
    Alabama Supreme Court in Perkins.
    14
    Alabama law requires a capital defendant to be “committed to the Department of Mental
    Health and Mental Retardation for examination” if there is a question about his capacity to stand
    trial or if there will be a mental-disease-or-defect defense. Ala. Code § 15-16-22(a). “The
    assigned mental health professional(s) shall examine the defendant with respect to determining
    the presence of any mental disease or defect which, if determined to be present, would affect the
    capacity of the defendant to proceed or continue to trial or which would affect the defendant’s
    criminal responsibility at the time of the commission of the crime.”
    Id. 47 Case:
    17-12524      Date Filed: 06/29/2020    Page: 48 of 81
    
    Jenkins, 972 So. 2d at 155
    . In this habeas appeal, Jenkins raises arguments about
    all three components of the intellectual disability showing under Atkins and
    Perkins, which we address in turn.
    1.     Intellectual Function
    The first component of intellectual disability under Perkins is “significantly
    subaverage intellectual functioning (an IQ of 70 or below).” 
    Perkins, 851 So. 2d at 456
    . Jenkins argues that the use of a strict IQ cutoff of 70 was contrary to or an
    unreasonable application of Atkins.
    We disagree. The state court’s decision that Jenkins failed to establish
    mental retardation in this respect was a reasonable application of the record and of
    Atkins. As a threshold matter, we note that the state court did not say it was
    applying a strict cutoff of 70; it merely stated that Dr. Kirkland had measured
    Jenkins’s IQ as 76. 
    Jenkins, 972 So. 2d at 155
    . Under our deferential review, the
    question is whether the decision that Jenkins had not established the intellectual
    functioning aspect of intellectual disability was an unreasonable application of
    Atkins. The Supreme Court explained in Atkins that it was leaving “to the State[s]
    the task of developing appropriate ways to enforce the constitutional restriction
    upon [their] execution of sentences.” 
    Atkins, 536 U.S. at 317
    (quoting Ford v.
    Wainwright, 
    477 U.S. 399
    , 416–17 (1986)). In line with that invitation, our Circuit
    has accepted Alabama’s judicial definition of intellectual disability as laid out in
    48
    Case: 17-12524        Date Filed: 06/29/2020       Page: 49 of 81
    Perkins. 15 See 
    Thomas, 607 F.3d at 752
    –53. Jenkins objects, however, that the
    Perkins standard, which he characterizes as articulating a “strict cutoff” of 70,
    conflicts with more recent Supreme Court precedent that instead requires a
    “clinical” definition that goes beyond a single IQ score.
    In particular, Jenkins points to Hall v. Florida, in which the Supreme Court
    held that when an offender’s IQ is near but greater than 70, courts must take into
    account the IQ test’s standard error of measurement as well as non-IQ evidence of
    intellectual function. See Hall v. Florida, 
    572 U.S. 701
    , 723 (2014) (“This Court
    agrees with the medical experts that when a defendant’s IQ test score falls within
    the test’s acknowledged and inherent margin of error, the defendant must be able
    to present additional evidence of intellectual disability, including testimony
    regarding adaptive deficits.”). But, as Jenkins concedes, our Circuit has
    specifically held that Hall is not retroactive to cases on collateral review. See In re
    Henry, 
    757 F.3d 1151
    , 1161 (11th Cir. 2014) (explaining that Hall does not supply
    a new substantive rule but rather “merely provides new procedures for ensuring
    that States do not execute members of an already protected group”). We also note
    that Alabama courts have found the Perkins standard to comport with Hall in that
    it does not prevent an offender from presenting the standard error of measurement
    15
    Notwithstanding the urging of the Alabama Supreme Court, see 
    Perkins, 851 So. 2d at 455
    n.1, the Alabama legislature has not enacted a statutory definition of intellectual disability.
    49
    Case: 17-12524     Date Filed: 06/29/2020    Page: 50 of 81
    or non-IQ evidence of intellectual disability. See Reeves v. State, 
    226 So. 3d 711
    ,
    728–29 (Ala. Ct. Crim. App. 2016). Here, the state court did not unreasonably
    apply Atkins when it analyzed the intellectual functioning component of
    intellectual disability.
    Jenkins also argues that the state court’s decision on this component in his
    Rule 32 proceeding resulted from an unreasonable determination of the facts. He
    asserts that his IQ score of 76, when combined with the test’s standard error of
    measurement and considered alongside the Flynn effect (which we discuss below),
    does show that he has significantly subaverage intellectual function. For the
    reasons that follow, we disagree.
    Most fundamentally, neither of the clinicians who testified about Jenkins’s
    intellectual ability in the Rule 32 hearing opined that he was mentally retarded.
    The closest thing Jenkins can point to is the testimony of Dr. Kirkland that his IQ
    is two standard deviations below the mean. But his entire testimony, in context, did
    not establish intellectual disability. To the contrary: Dr. Kirkland testified that
    Jenkins “scored in the range of borderline intellectual functioning which is
    between mild mental retardation and low average intellectual functioning.”
    Furthermore, Jenkins’s own expert Dr. Lisak fully reviewed Dr. Kirkland’s clinical
    findings. He agreed with those findings, concluding that the IQ results show
    “borderline intelligence.” It is tremendously significant that no clinical assessment
    50
    Case: 17-12524      Date Filed: 06/29/2020   Page: 51 of 81
    in the entire record of these proceedings has found that Jenkins has mental
    retardation or intellectual disability.
    Jenkins nonetheless argues that his IQ score of 76 establishes the intellectual
    component of intellectual ability when the standard error of measurement and the
    Flynn effect are considered alongside that score. It was not unreasonable for the
    state court to disagree. As we have discussed, Jenkins is not retroactively entitled
    to have the state courts take into account the margin of error of the IQ test. That
    statistical margin of error—5 points in this case—takes into account characteristics
    of the test and variations due to chance in order to state how confident the tester is
    that the measured result accurately states Jenkins’s true, unknowable IQ. A result
    of 76 with a standard error of measurement of 5 simply means that the tester is
    68% confident that Jenkins’s true IQ falls between 71 and 81, and 95% confident
    that his true IQ falls between 66 and 86. See David H. Kaye & David A. Freedman,
    Reference Guide on Statistics, in Reference Manual on Scientific Evidence 211,
    243–44 (3d ed. 2011); see also 
    Hall, 572 U.S. at 738
    –39 (Alito, J., dissenting). Of
    course, Jenkins would like us to consider only the possibility that the test result
    overstated his IQ—but the standard error of measurement is a two-way street.
    “[T]he standard error of measurement is a bi-directional concept that does not
    carry with it a presumption that an individual’s IQ falls to the bottom of his IQ
    51
    Case: 17-12524     Date Filed: 06/29/2020     Page: 52 of 81
    range.” Ledford v. Warden, Ga. Diag. & Classification Prison, 
    818 F.3d 600
    , 641
    (11th Cir. 2016).
    Even if Jenkins were somehow entitled to subtract the 5-point margin of
    error from his score and thereby lower his “true” IQ to 71, he still would not satisfy
    the clinical intellectual component of intellectual disability. Thus, he sought in the
    district court to introduce evidence about the Flynn effect in order to bring his IQ
    down to 70 or below. As our Court has explained, the Flynn effect “recognizes the
    fact that IQ test scores have been increasing over time”:
    The Flynn effect acknowledges that as an intelligence test ages, or
    moves farther from the date on which it was standardized, or normed,
    the mean score of the population as a whole on that assessment
    instrument increases, thereby artificially inflating the IQ scores of
    individual test subjects. Therefore, the IQ test scores must be
    recalibrated to keep all test subjects on a level playing field.
    
    Thomas, 607 F.3d at 753
    . We have said that “[a]n evaluator may also consider the
    ‘Flynn effect’” in assessing an offender’s possible intellectual disability,
    id. (emphasis added),
    but neither we nor the Alabama Supreme Court nor the U.S.
    Supreme Court have said that a court must consider it in order to reasonably apply
    Atkins. See, e.g., 
    Reeves, 226 So. 3d at 739
    (“This Court has repeatedly held that a
    circuit court is not required to accept, consider, or apply the ‘Flynn Effect’ in
    determining intellectual disability.”).
    More problematically, Jenkins did not raise the Flynn effect issue in the
    Alabama state courts. Jenkins asserts that he implicitly raised it as part and parcel
    52
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    of his Atkins claim during his Rule 32 appeal, but we do not agree that the
    Alabama courts had a full and fair opportunity to consider this issue, because it
    was not explicitly presented to them. See Kelley v. Sec’y for the Dep’t of Corr., 
    377 F.3d 1317
    , 1349–50 (11th Cir. 2004) (holding that one ineffective-assistance
    argument was unexhausted despite the petitioner’s general presentation of a
    Strickland claim in the state courts). Thus, under AEDPA, Jenkins is procedurally
    barred from raising this unexhausted claim in his federal habeas petition. See 28
    U.S.C. § 2254(b)(1)(A), (c); Mason v. Allen, 
    605 F.3d 1114
    , 1119 (11th Cir. 2010).
    We will allow a prisoner to overcome a procedural bar if he establishes cause for
    his default and prejudice therefrom. See, e.g., Smith v. Jones, 
    256 F.3d 1135
    , 1138
    (11th Cir. 2001). But Jenkins cannot establish prejudice from being barred from
    asserting this claim now because the Supreme Court has not “clearly established”
    that a court must consider the Flynn effect in assessing intellectual disability. Thus,
    under AEDPA, it could not form the basis for a federal habeas claim. See 28
    U.S.C. § 2254(d)(1). We therefore conclude that the state court did not
    unreasonably determine the facts or unreasonably apply Atkins with respect to the
    intellectual component of intellectual disability.
    2.      Adaptive Function
    The second component of intellectual disability is “significant or substantial
    deficits in adaptive behavior.” 
    Perkins, 851 So. 2d at 456
    . Jenkins argues that the
    53
    Case: 17-12524     Date Filed: 06/29/2020    Page: 54 of 81
    state court, which mentioned only Jenkins’s successes in employment and social
    skills, see 
    Jenkins, 972 So. 2d at 155
    , failed to consider his deficits. He adds that
    even the mention of employment success does not tell the whole story. Jenkins
    insists that his jobs were menial, his employers took advantage of him, and he held
    the jobs for only a few months each.
    But the state court’s terse discussion of Jenkins’s adaptive behavior did not
    involve an unreasonable determination of the facts or an unreasonable application
    of Atkins. To the contrary, its decision on this issue was reasonable in light of both
    the record and Atkins.
    Atkins elaborated that the adaptive-skill component of intellectual disability
    requires substantial present limitation in at least two of the following areas:
    “communication, self-care, home living, social skills, community use, self-
    direction, health and safety, functional academics, leisure, and work.” 
    Atkins, 536 U.S. at 308
    n.3 (quoting definition of American Association on Mental
    Retardation). The record supports the state court’s judgment that Jenkins does not
    have substantial deficits in at least two areas. To be sure, we will assume that
    Jenkins may be substantially limited in functional academics; Dr. Kirkland
    assessed his reading, spelling, and arithmetic skills at a third-grade level. But the
    record does not compel a finding of substantial present deficits in the areas of
    communication, self-care, home living, and work. Although Jenkins emphasizes
    54
    Case: 17-12524     Date Filed: 06/29/2020    Page: 55 of 81
    his transient employment, the record shows he was able to find work quickly, to
    work hard to support the Seals’ household until Lonnie Seal found a job, and, later,
    to move into his own home. That record evidence is inconsistent with a substantial
    deficit in the area of work.
    As the State observes, the facts of the crime also fail to show significant
    deficits in the areas of communication, self-care, community use, and self-
    direction. Jenkins was able to communicate well enough to solicit an alibi and to
    sell his car, including writing out a bill of sale. He then was able to arrange for his
    flight from Alabama, including purchasing a bus ticket and hitchhiking across the
    country. Indeed, throughout his trial and postconviction proceedings, the people
    who knew Jenkins as an adult consistently described a man who did not have
    serious difficulties in communicating, forming relationships, working, and caring
    for himself. No witness mentioned these kinds of difficulties in his or her
    testimony about Jenkins. There was some evidence that Jenkins was “not
    articulate” and that his house was messy, but that testimony does not rise to the
    level of overwhelming evidence of substantial functional deficits that would
    support a conclusion that the state court unreasonably determined the facts.
    Of course, the record also contains evidence of Jenkins’s childhood
    academic and social deficits, attributable at least in part to his parents’ neglect, but
    Jenkins’s childhood is not directly relevant to our consideration of his present
    55
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    limitations. Although we acknowledge that the Supreme Court has noted that such
    “risk factors” may support further exploration of the possibility of intellectual
    disability, see Moore v. Texas, 
    137 S. Ct. 1039
    , 1051 (2017), the state court record
    contains the results of that exploration. Overall, that record supports the state
    court’s conclusion that Jenkins does not have substantial deficits in adaptive
    behaviors.
    3.     Juvenile Onset
    The third and final component of intellectual disability is manifestation of
    the first and second components “before the defendant reached age 18.” 
    Perkins, 851 So. 2d at 456
    . Jenkins asserts, the State assumes, and we agree that the state
    court did not rule upon this issue, so there is nothing to which we must defer under
    AEDPA. See, e.g., Brumfield v. Cain, 
    135 S. Ct. 2269
    , 2282 (2015). Thus, we will
    review the district court’s legal conclusions on this issue de novo, and its factual
    findings for clear error. See, e.g., Grossman v. McDonough, 
    466 F.3d 1325
    , 1335
    (11th Cir. 2006). Jenkins argues that he has satisfied the age-of-onset component
    by showing “a wide range of evidence of deficits in both intellectual and adaptive
    functioning throughout Jenkins’s childhood.”
    In fact, the ample record of Jenkins’s childhood, as developed in the Rule 32
    proceeding, does not point to intellectual disability before age 18. School
    assessments at age 12 reported an IQ score of 83, an adaptive behavior rating of
    56
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    “low,” and noted overall an intellectual capacity of “average,” a diagnosis of
    dyslexia, and “poor functional skills.” The psychologist attributed Jenkins’s
    difficulties to a combination of “[f]requent moves, changes in schools and family
    instability” with “[l]ow ability coupled with a specific learning disability” and
    “[l]ack of responsibility for self control and poor use of time.” Although Jenkins
    failed several grades of school, teachers additionally attributed his difficulties to
    his behavioral problems and his high number of absences from school.
    Similarly, IQ tests ordered by the juvenile court at age 14 gave scores of 81
    and 86 on different tests, in the “[d]ull–[n]ormal” range and reflecting “a definite
    learning disability.” These records all show a child with serious academic deficits
    and some intellectual and adaptive deficits, but they do not clearly show an
    intellectually disabled child. In particular, Jenkins’s childhood IQ scores of 83, 81,
    and 86 fail to point to intellectual disability or mental retardation. We are not left
    with the definite and firm conviction that the district court erred when it found that
    “Jenkins’s [childhood] intelligence scores and adaptive functioning skills were
    attributable to his learning disability and other circumstances in his life, rather than
    mental retardation.”
    57
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    In sum, we agree with the district court that the decision of the Alabama
    Court of Criminal Appeals that Jenkins does not have intellectual disability was
    not contrary to or an unreasonable application of Atkins v. Virginia. 16
    16
    In light of our determination that Jenkins has not met his burden of demonstrating that the state
    court’s decision was contrary to, or an unreasonable application of, Atkins under § 2254(d), his
    request for an evidentiary hearing is denied. The dissent asserts that we are attempting to
    “rewrite history” and refusing to consider Jenkins’s challenge to the district court’s denial of his
    request for an evidentiary hearing, but that is simply not the case. Even accepting the dissent’s
    contentions that the COA granted in this case could be construed as encompassing the district
    court’s denial of the evidentiary hearing, the inescapable fact remains that Jenkins did not
    challenge the denial of the evidentiary hearing in this appeal. Instead, he asserted that:
    “[o]nce a petitioner has shown the state court merits adjudication was
    unreasonable under § 2254(d), § 2254(e)(2) allows for an evidentiary hearing so
    long as the petitioner was diligent in state court and pleads facts that, if true,
    would warrant relief. . . . Because § 2254(d)’s limitations have been overcome . . .
    and Jenkins alleged facts sufficient to show he meets all three Atkins prongs, . . .
    to the extent this Court finds the record insufficient to grant relief, it should
    remand for an evidentiary hearing.”
    With this statement, Jenkins is clearly not challenging the district court’s denial of his request for
    an evidentiary hearing. Indeed, at no point in any of his filings before this Court did Jenkins ever
    argue that the district court abused its discretion in denying his request for an evidentiary
    hearing. In other words, our prior opinion erroneously addressed an issue that was not properly
    before this Court, which must be corrected, despite the fact that the dissent, inexplicably, would
    prefer that we manufacture and address an argument that was never presented. To be clear,
    Jenkins’s only discussion in this Court regarding the matter of an evidentiary hearing was his
    request that (A) in the event that we determined that he was entitled to relief under § 2254(d)—
    i.e., if we concluded that the state court’s decision was contrary to, or an unreasonable
    application of, Atkins—and (B) we found the record otherwise insufficient to grant him relief
    upon de novo review of his claim, then (C) we should remand for an evidentiary hearing,
    pursuant to § 2254(e)(2). Jenkins framed his evidentiary hearing request in this manner because,
    pursuant to Cullen v. Pinholster, 
    563 U.S. 170
    , 185 (2011), a § 2254 petitioner is precluded from
    receiving an evidentiary hearing in the district court on a claim that was adjudicated on the
    merits by a state court, unless he first demonstrates an entitlement to relief under § 2254(d).
    Thus, for the reasons previously set forth in this opinion, because we conclude Jenkins has not
    met his burden of demonstrating that the state court’s decision was contrary to, or an
    unreasonable application of, Atkins, under § 2254(d), Supreme Court precedent precludes an
    evidentiary hearing on his claim.
    Id. In other
    words, if, and only if, the state habeas petitioner
    clears § 2254(d)’s hurdles, may an evidentiary hearing be granted, provided that an evidentiary
    hearing is not otherwise barred by the limitations set forth in § 2254(e)(2).
    Id. at 185–86;
    Pope
    58
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    IV.     CONCLUSION
    The denial of Jenkins’s petition for a writ of habeas corpus is
    AFFIRMED.
    v. Sec’y, Fla. Dep’t of Corrs., 
    752 F.3d 1254
    , 1263 (11th Cir. 2014) (“[Pinholster] rests on a
    clear, emphatic rule: if a state court has adjudicated the claim on the merits, then a petitioner
    must satisfy § 2254(d)(1) based only on the record before that state court. . . . It is also true that,
    under Pinholster, § 2254(d) must be satisfied before a federal habeas court may consider any
    § 2254(e)(2) evidence.”). Accordingly, because Jenkins did not overcome § 2254(d)’s hurdles,
    we do not reach the point advanced by the dissent as to whether Jenkins otherwise satisfied
    § 2254(e)(2)’s requirements for an evidentiary hearing.
    59
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    WILSON, Circuit Judge, dissenting:
    Mark Jenkins must prove that the Alabama state courts acted unreasonably
    in denying him post-conviction collateral relief. 28 U.S.C. § 2254(d)(1). Jenkins
    has satisfied that burden as to his ineffective assistance of counsel claim, contrary
    to the majority’s conclusion. As for his Atkins claim, the record is insufficient to
    decide whether Jenkins is entitled to relief, and the matter should be remanded for
    an evidentiary hearing. The majority, however, refuses to consider Jenkins’s
    request for a hearing and relies on pre-Atkins evidence to deny him relief. Because
    I disagree with the majority’s conclusions, I dissent.
    I.     Ineffective Assistance of Counsel at Penalty Phase
    Jenkins first asserts that his trial counsel’s failure to investigate his abusive
    upbringing and to present any mitigating evidence at the penalty phase of his trial
    constituted ineffective assistance of counsel. The majority rejects this contention,
    concluding that the Alabama state courts did not act unreasonably in denying
    Jenkins’s ineffective assistance of counsel claim on collateral review. I disagree
    and maintain that Jenkins established both deficient performance and prejudice,
    entitling him to habeas relief. See Strickland v. Washington, 
    466 U.S. 668
    , 687
    (1984).
    60
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    A. Deficient Performance
    The Alabama state courts concluded that Jenkins’s counsel, Stan Downey,
    did not perform deficiently at the penalty phase. The majority finds that
    conclusion reasonable primarily because Downey (1) was not obligated to
    investigate Jenkins’s abusive childhood and (2) reasonably pursued a residual
    doubt strategy at the penalty phase. But further review of the record requires me to
    part ways with the majority’s reasoning and, ultimately, persuades me that the
    Alabama courts’ conclusion was indeed unreasonable. See 28 U.S.C. § 2254(d)(1)
    (providing that a writ of habeas corpus should not be granted to a state prisoner
    unless the state court adjudication involved “a decision that was contrary to, or
    involved an unreasonable application of, clearly established Federal law, as
    determined by the Supreme Court of the United States”).
    Jenkins offers numerous examples of how his counsel performed deficiently
    in the penalty phase of trial. First, counsel failed to thoroughly investigate
    Jenkins’s abusive childhood—an error that constitutes deficient performance. In
    Williams v. Allen, we held that counsel’s failure to investigate mitigating evidence
    at the penalty stage constituted ineffective assistance of counsel because counsel
    drew upon only three sources of information—a psychologist’s report, a
    presentence investigation report, and an interview with the appellant’s mother. 
    542 F.3d 1326
    , 1340 (11th Cir. 2008) (Williams v. Allen); see also Debruce v. Comm’r,
    61
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    Ala. Dep’t of Corr., 
    758 F.3d 1263
    , 1270, 1273–74 (11th Cir. 2014) (finding
    counsel’s performance deficient where counsel interviewed the petitioner and his
    mother, but failed to contact expert witnesses or other family members). In that
    case, we concluded that counsel’s lack of investigation resulted in “an incomplete
    and misleading understanding of Williams’ life history.” Williams v. 
    Allen, 542 F.3d at 1340
    .
    Jenkins’s counsel did even less than the attorneys in Williams v. Allen and
    Debruce. That is, Jenkins’s counsel conducted no investigation. Downey did not
    consider Jenkins’s poor school records, mention Jenkins’s juvenile history,
    produce documentary evidence that Jenkins suffered from severe depression, or
    pursue records demonstrating Jenkins’s significant deficits in cognitive functions.
    We have previously found that a counsel’s failure to investigate these rudimentary
    examples of mitigating evidence constitutes ineffective assistance of counsel. See
    Daniel v. Comm’r, Ala. Dep’t of Corr., 
    822 F.3d 1248
    (2016) (reversing and
    remanding the district court’s dismissal of the ineffective assistance of counsel
    claim and noting how counsel should have more thoroughly investigated Daniel’s
    history of physical and sexual abuse, his poor school records, and evidence of a
    potential intellectual disability).
    Given the lack of preparation, it is not surprising that Downey failed to call
    any witnesses to testify at the penalty stage about Jenkins’s childhood, thus failing
    62
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    to give a complete depiction of Jenkins’s “excruciating life history.” See Wiggins
    v. Smith, 
    539 U.S. 510
    , 537 (2003) (finding deficient performance where counsel
    did not adequately investigate petitioner’s life history for mitigating evidence); see
    also 
    Debruce, 758 F.3d at 1270
    , 1273–74; Johnson v. Sec’y, Dep’t of Corr., 
    643 F.3d 907
    , 932 (11th Cir. 2011) (“No reasonable attorney, after being told by his
    client that he had an abusive upbringing, would fail to interview members of his
    client’s family who were readily available and could corroborate or refute the
    allegations of abuse.”).1 If Downey had effectively investigated—or investigated
    at all—he would have been aware of several available and informed witnesses.
    Ultimately, only one witness testified at the penalty phase: Lonnie Seal.2 Downey
    met with Seal for only 15 minutes before the penalty phase began. That 15
    minutes represents the extent of Downey’s preparation for the penalty phase—a
    wholly inadequate amount of time under Supreme Court precedent. See Williams
    v. Taylor, 
    529 U.S. 362
    , 395 (2000) (Williams v. Taylor) (finding mitigation
    investigation deficient where “counsel did not begin to prepare for that phase of the
    proceeding until a week before the trial”).
    1
    The majority goes to great pains to maintain that Downey did not know about Jenkins’s abusive
    childhood. This assertion is directly refuted by the record. Douglas Scofield, Jenkins’s lead
    attorney, testified that Jenkins described his traumatic upbringing at meetings at which Downey
    was present.
    2
    It is unclear whether Downey contacted Seal and requested that he testify during the penalty
    phase of trial. Given that Downey urged Scofield to conduct Seal’s direct examination because
    Scofield was better acquainted with Seal, it is likely that Scofield made the arrangements.
    63
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    Despite ample evidence of deficient performance, the Alabama Court of
    Criminal Appeals (CCA) concluded that Downey performed reasonably. The
    CCA’s decision rested on three explanations: (1) because Downey did not testify,
    courts must presume he acted reasonably; (2) based on the record, Downey played
    an active role investigating and preparing for the penalty phase of trial; and
    (3) Downey’s decision to pursue a residual doubt strategy was reasonable.3
    Because each of these findings constituted an unreasonable determination of the
    facts or an unreasonable application of clearly established federal law, Jenkins is
    entitled to habeas relief. See 28 U.S.C. § 2254(d)(1)–(2).
    The CCA’s first rationale—presuming Downey acted reasonably because
    Downey did not testify at the Rule 32 hearing—was based on both an unreasonable
    determination of facts and an unreasonable application of clearly established law.
    The CCA stated that “the record is virtually silent as to what actions were or were
    not taken or what was or was not done by Mr. Downey at trial and why” and
    therefore assumed that Downey’s actions “could have been reasonable and
    strategic under the circumstances.” The majority likewise assumes Downey acted
    reasonably. This conclusion is based, in large part, on Downey’s failure to testify
    at the Rule 32 hearing. According to the majority, “[t]he problem for Jenkins is
    that, like the state courts, this Court also does not know what Downey did or why.”
    3
    The majority opinion endorsed the CCA’s first and third explanations.
    64
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    But the record clearly illustrates Downey’s failure to investigate and overall
    lack of preparation. First, Downey’s fee declarations—which the majority
    concedes were “detailed”—showed no investigation of mitigating circumstances,
    and no preparation for the penalty phase. Importantly, Downey’s fee declarations
    were exceptionally detailed, recounting his work in five-minute increments. The
    single reference to the “mitigating” phase of trial in the declarations concerned a
    meeting with Scofield that occurred only a week before trial. Other than that
    vague entry, no notation indicates that Downey did anything to prepare for the
    penalty phase of trial during the nearly two years he represented Jenkins.
    Second, and more persuasively, Douglas Scofield, Jenkins’s lead attorney,
    explicitly testified that Downey told him that Downey had not investigated
    potential mitigating evidence. Both the Alabama courts and the majority ignore
    that fact and instead focus on Scofield’s testimony that, “[a]part from what he has
    told me, I don’t know what he has done.” This statement, to which the majority
    assigns great weight, is hardly illuminating. Of course Scofield knows only what
    Downey told him. And what Downey told him was this: Downey did not
    investigate potentially mitigating evidence before the penalty phase.
    In the face of this direct evidence of deficient performance, the Alabama
    courts and the majority pivot to Downey’s failure to testify at the Rule 32 hearing.
    Without his testimony, the majority reasons, we must assume that Downey’s
    65
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    decision not to investigate was strategic and therefore his representation
    reasonable. I disagree, and I have reservations about the practical effects of the
    majority’s understanding of the law. The majority suggests (if not holds) that the
    absence of testimony from an allegedly deficient attorney per se means that the
    attorney’s actions were reasonable. It is true that “counsel is strongly presumed to
    have rendered adequate assistance,” 
    Strickland, 466 U.S. at 690
    . But a petitioner
    may overcome that burden with evidence of inadequate assistance. And that
    evidence may take various forms. To satisfy the burden, it is not necessary for the
    allegedly deficient counsel to testify and admit wrongdoing. Nor is it necessary for
    the record to reflect counsel’s “thoughts and intentions as he prepared for the
    penalty phase,” as the majority seems to require. When evaluating whether a
    counsel’s performance was deficient, we ask whether his performance “fell below
    an objective standard of reasonableness.” Strickland, 
    466 U.S. 687
    –88. We do not
    contemplate what counsel thought or intended. We consider whether his
    performance was objectively unreasonable. See
    id. Because the
    Alabama courts
    did not apply the proper standard, their conclusion was an unreasonable application
    of clearly established law. See
    id. The CCA’s
    second reason for denying Jenkins relief was also based on an
    unreasonable application of clearly established federal law. The CCA concluded
    that Downey had adequately investigated and prepared for the penalty phase of
    66
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    trial, emphasizing that Downey met with Jenkins on several occasions and spoke
    with Jenkins’s grandmother. Based on these findings, the CCA determined that
    Downey provided adequate assistance of counsel during the penalty phase. This is
    an unreasonable application of clearly established law that “[a]n attorney has a
    duty to conduct a reasonable investigation, including an investigation of the
    defendant’s background, for possible mitigating evidence.” Porter v. Singletary,
    
    14 F.3d 554
    , 557 (11th Cir. 1994).
    As previously discussed, it is clear from the record that Downey knew of
    Jenkins’s horrible upbringing yet still failed to investigate potentially mitigating
    evidence. “A reasonable investigation . . . should have included, at a minimum,
    interviewing other family members who could corroborate the evidence of abuse
    and speak to the resulting impact on [Jenkins].” Williams v. 
    Allen, 542 F.3d at 1340
    . But Downey did not conduct a single interview—of a family member or
    otherwise—in preparation of the penalty phase. 4 Because Downey did not conduct
    an investigation, let alone a reasonable investigation, the CCA’s conclusion that
    Downey adequately investigated potentially mitigating evidence was an
    unreasonable application of clearly established law.
    4
    Downey’s fee declaration reflects one telephone call he had with Jenkins’s grandmother, Doris
    Wagoner. But that call occurred 18 months before trial and, according to Wagoner, concerned a
    request for money.
    67
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    The CCA’s third rationale for its decision—that Jenkins’s counsel
    reasonably and strategically decided to focus on residual doubt—was both an
    unreasonable application of clearly established law and an unreasonable
    determination of the facts. In Williams v. Taylor, the Supreme Court held that
    otherwise reasonable trial strategies cannot be justified unless counsel first
    conducted a constitutionally adequate 
    investigation. 529 U.S. at 395
    –96. And
    here, Downey conducted no such investigation. It cannot be said, therefore, that
    Downey’s decision—if one can even call it that—to pursue a residual doubt
    strategy was strategically reasonable. See
    id. The CCA’s
    conclusion to the
    contrary was an unreasonable application of clearly established law.
    Likewise, the conclusion was an unreasonable determination of the facts.
    On direct appeal, the Alabama CCA noted that “[t]he evidence overwhelmingly
    pointed to the guilt of the appellant.” Jenkins v. State, 
    627 So. 2d 1034
    , 1041 (Ala.
    Crim. App. 1992). Then, on appeal from Jenkins’s Rule 32 petition, the CCA
    again acknowledged how “[t]he evidence establishing Jenkins’s guilt was
    overwhelming.” Jenkins v. State, 
    972 So. 2d 111
    , 157 (Ala. Crim. App. 2004); see
    also
    id. at 156
    (“The amount of evidence incriminating Jenkins . . . was
    overwhelming.”). Despite the “overwhelming” evidence of Jenkins’s guilt, the
    CCA concluded that Jenkins’s counsel acted reasonably in presenting a residual
    doubt defense during the penalty phase of trial. But no reasonable attorney would
    68
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    employ a residual doubt strategy in the face of such overwhelming evidence. See
    
    Johnson, 643 F.3d at 932
    –33. The Alabama courts’ contrary conclusion, therefore,
    was an unreasonable determination of the facts.
    B. Prejudice
    Jenkins’s Rule 32 petition also pleaded sufficient facts to show that his
    counsel’s deficient performance prejudiced his defense, satisfying the second
    Strickland prong. To establish prejudice, a petitioner must show a “reasonable
    probability that, but for counsel’s unprofessional errors, the result of the
    proceeding would have been different.” 
    Strickland, 466 U.S. at 694
    . Here, the
    jury voted in favor of the death penalty by the slimmest margin permitted under
    Alabama law: ten votes in favor and two votes against. Jenkins need only
    establish, then, “a reasonable probability that at least one juror would have struck
    a different balance.” 
    Wiggins, 539 U.S. at 537
    (emphasis added). In measuring
    that probability, we “evaluate the totality of the available mitigation evidence—
    both that adduced at trial, and the evidence adduced in the habeas proceeding in
    reweighing it against the evidence in aggravation.” Williams v. 
    Taylor, 529 U.S. at 397
    –98.
    The testimony elicited at the Rule 32 hearing was horrendous. Four family
    members offered detailed, consistent testimony about Jenkins’s traumatic
    childhood. The majority describes that testimony, highlighting some of the most
    69
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    appalling facts elicited at the Rule 32 hearing. For example, Jenkins’s stepfather
    would beat Jenkins on a semi-daily basis, would lock him in a room for hours
    without food, and even made Jenkins eat his own feces. In addition to the
    mitigating facts detailed by the majority, the following came to light during the
    Rule 32 hearing. Jenkins’s mother had an affair while her husband, Jenkins’s
    stepfather, was in prison. When Jenkins’s stepfather was released, he took out his
    frustrations about the affair on Jenkins. Because Jenkins’s biological father was
    Hispanic, Jenkins’s stepfather referred to Jenkins in demeaning names like “piece
    of shit,” “Mexican trash,” “Puerto Rican puke,” and “bastard.”
    The Rule 32 testimony also detailed the alcohol substance abuse, drug
    addiction, and incessant domestic violence that surrounded Jenkins’s childhood.
    And, most shockingly, the testimony described how Jenkins’s grandfather sexually
    abused Jenkins when Jenkins was just four years old. As a result of that sexual
    abuse, Jenkins, suffered bladder and bowel movement issues. Jenkins’s
    incontinence became a trigger for his stepfather: when Jenkins had an accident, his
    stepfather would beat him or subject him to severe degradation. For example,
    Jenkins’s stepfather would hang Jenkins’s soiled sheets in the front yard for all the
    neighbors to see, make Jenkins wear his soiled clothes on his head, and, most
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    disturbingly, make Jenkins eat his own feces. The only way to escape the abuse
    was by running away. So, by age twelve, Jenkins lived on the streets. 5
    Jenkins also introduced medical, school, and juvenile court records from his
    childhood, which shed further light on his difficult childhood and intellectual
    deficiencies. Moreover, two psychologists testified about Jenkins’s history of
    psychological trauma stemming from his childhood abuse—weighty evidence that
    is not even considered in the majority’s discussion. Finally, two prison guards
    testified that Jenkins was the ideal prisoner during pretrial detention. One of the
    guards even described Jenkins as the best inmate he had ever supervised.
    Given this compelling mitigating evidence, it is not difficult to conclude that
    Jenkins established “a reasonable probability that at least one juror would have
    struck a different balance” between life and death. 
    Wiggins, 539 U.S. at 537
    ; see
    also 
    Daniel, 822 F.3d at 1276
    (listing several factors that support a prejudice
    finding, including (1) evidence of impaired intellectual functioning; (2) evidence of
    childhood sexual abuse; and (3) the fact that the jury voted only 10–2 in
    recommending a death sentence).
    5
    The CCA found parts of the family members’ testimony not credible, though it did not
    explicitly discredit testimony describing some of the worst abuse. Given the grotesque nature of
    the family members’ testimony, and the fact that their testimony was consistent, there is
    reasonable probability that at least one more juror would have been compelled to vote against a
    death sentence.
    71
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    II.      Intellectual Disability
    Jenkins also argues that he is entitled to habeas relief under Atkins v.
    Virginia, 
    536 U.S. 304
    (2002). He contends that he satisfies the three requirements
    necessary to establish intellectual disability under Alabama law—(1) subaverage
    intellectual functioning; (2) deficits in adaptive behavior; and (3) onset before the
    age of 18, see Ex parte Perkins, 
    851 So. 2d 453
    , 456 (Ala. 2002)—thus, exempting
    him from implementation of the death penalty. Alternatively, Jenkins argues that
    we should remand for an evidentiary hearing on the Atkins issue if we determine
    that the record is insufficient to decide the claim.
    The majority concludes that the CCA did not act unreasonably in concluding
    that Jenkins failed to satisfy any of the Perkins prongs. In doing so, it relies on the
    evidence that Jenkins presented before the Supreme Court decided Atkins. In a
    previous opinion that it now vacates, the majority also addressed Jenkins’s request
    for an evidentiary hearing and determined that he was not entitled to one because
    he had not diligently attempted to develop the factual basis for his Atkins claim in
    state court. Jenkins v. Comm’r, Ala. Dep’t of Corr., 
    936 F.3d 1252
    , 1280 (11th
    Cir. 2019). Alternatively, the majority concluded that Jenkins would not be able to
    prove that he was intellectually disabled at such a hearing, given the “ample
    evidence about intellectual ability” that Jenkins had already adduced.
    Id. The majority
    now concludes that Jenkins did not properly appeal the evidentiary-
    72
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    hearing issue because it was not explicitly specified in the certificate of
    appealability (COA) or properly asserted in his initial brief.
    I disagree with the majority’s decision that the evidentiary-hearing issue is
    not squarely before this court on appeal for several reasons discussed below. And I
    also disagree with the majority’s ultimate conclusion that the CCA did not act
    unreasonably in concluding that Jenkins failed to satisfy any of the Perkins prongs,
    as the record is insufficient to undergo a substantive Atkins analysis and the matter
    should be remanded for an evidentiary hearing.
    A. Appellate Review of Jenkins’s Request for an Evidentiary Hearing
    The majority attempts to rewrite history and now claims that Jenkins did not
    properly appeal the denial of an evidentiary hearing, apparently because the COA
    does not explicitly refer to an evidentiary hearing. I disagree because the basis of
    the district court’s denial of an evidentiary hearing, the record of the appeal, and
    the nature of the appeal—a constitutional claim by a death row petitioner—support
    construing the COA to encompass the evidentiary hearing issue.
    First, the COA should be construed to encompass the denial of an
    evidentiary hearing because the district court’s denial of Jenkins’s Atkins claim and
    its denial of his request for a hearing were one and the same. In the order denying
    Jenkins’s motion for an evidentiary hearing, the district court stated that Jenkins
    would first have to prevail under § 2254(d) to be entitled to an evidentiary hearing.
    73
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    The court then addressed Jenkins’s Atkins claim at great length and concluded that
    he failed to show that the CCA’s decision was unreasonable under § 2254(d).
    Then it summarily stated that “[b]ecause he cannot prevail on his Atkins claim,
    Jenkins is not entitled to an evidentiary hearing on that claim,” without further
    discussion.
    Second, the majority’s decision to not consider Jenkins’s request for an
    evidentiary hearing is contrary to the record of this appeal. Jenkins specifically
    appealed the denial of his motion for an evidentiary hearing in the Notice of
    Appeal. His motion for a COA requested review of the district court’s
    determination that his Atkins claim failed—the basis of its denial of an evidentiary
    hearing. The panel granted a COA on the issue of “[w]hether the district court
    erred in denying Appellant’s claim that he is intellectually disabled and ineligible
    for the death penalty under Atkins” without explicitly specifying his request for an
    evidentiary hearing.
    Nonetheless, in the eyes of the panel and the parties—at least initially—the
    COA encompassed Jenkins’s request for an evidentiary hearing. In his initial brief,
    Jenkins asserts that the state court record shows that he is intellectually disabled
    and, alternatively, requests the court remand for an evidentiary hearing if the court
    finds the record insufficient to grant relief. Jenkins even states that he “has not had
    an opportunity to develop and present his claim post-Atkins.” The government
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    does not challenge the propriety of addressing Jenkins’s request for an evidentiary
    hearing—it argues that he is not entitled to one. And the majority squarely
    addressed Jenkins’s request for an evidentiary hearing in its previous opinion, but
    it agreed with the government that Jenkins was not entitled to one. See 
    Jenkins, 936 F.3d at 1275
    , 1279–80 (stating “[Jenkins] also appeals the denial of an
    evidentiary hearing on this issue” and “Jenkins argues that the district court erred
    when it denied his request for an evidentiary hearing on his Atkins claim”).
    Finally, for the majority to now change course is particularly troubling
    because Jenkins is a death row petitioner raising an Atkins claims, and he has never
    had a post-Atkins hearing on his claim. See Burgess v. Comm’r, Ala. Dep’t of
    Corr., 
    723 F.3d 1308
    , 1316, 1318 (11th Cir. 2013) (holding that the state court
    unreasonably relied on the pre-Atkins record, where evidence “was presented in an
    entirely different context and without the benefit of any explanation of how it
    would or would not be consistent with” an intellectual disability).
    To be sure, this court’s review is limited to the issues specified in the COA.
    McClain v. Hall, 
    552 F.3d 1245
    , 1254 (11th Cir. 2008). But we also “construe the
    issue specification in light of the pleadings and other parts of the record.” Murray
    v. United States, 
    145 F.3d 1249
    , 1251 (11th Cir. 1998) (per curiam). Here, the
    district court did not make an independent determination concerning an evidentiary
    hearing; it determined that Jenkins’s Atkins claim failed and, therefore, that Jenkins
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    was not entitled to either habeas relief or an evidentiary hearing. Jenkins
    specifically appealed the district court’s denial of his request for an evidentiary
    hearing, and he has maintained on appeal that an evidentiary hearing is warranted
    if the court finds the record insufficient to determine his Atkins claim. Moreover,
    the parties and the court were all in agreement—until the majority’s abrupt change
    of mind—that the scope of the appeal included the district court’s denial of an
    evidentiary hearing.
    I see no reason why the majority now turns a blind eye to these parts of the
    record and withholds appellate review from Jenkins on his request for an
    evidentiary hearing.
    B. Jenkins’s Atkins Claim
    I also disagree with the majority’s conclusion that Jenkins is not entitled to
    relief on his Atkins claim, as it is not possible to undergo a substantive Atkins
    analysis based on the record before us. For one, the CCA’s evaluation of Jenkins’s
    Atkins claim was a mere three sentences. And, more significantly, Jenkins never
    had an opportunity to present evidence on his Atkins claim. To deny Jenkins’s
    claim, therefore, the majority relies on evidence from unrelated parts of the record.
    Such an approach is improper because, “[p]rior to Atkins, [the petitioner] could not
    have been expected to necessarily present evidence sufficient to support an Atkins
    claim because such evidence constituted a [double-edged] sword.” Burgess, 723
    76
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    of 81 F.3d at 1320
    . The evidence was a double-edged sword, we explained, because
    prior to Atkins, evidence of intellectual disability could suggest that a defendant
    would be dangerous in the future; therefore, “a defendant could reasonably decide
    not to highlight his mental retardation.”
    Id. at 1318.
    For that reason, courts should
    not rely on pre-Atkins evidence—evidence that was presented in a wholly distinct
    context—to support a finding that a petitioner is not intellectually disabled. So,
    here, instead of attempting to make a medical diagnosis based on an insufficient
    record, we should remand for an evidentiary hearing.
    The government argues that Jenkins did not diligently attempt to present his
    Atkins claim in the state courts, and so he should be precluded from an evidentiary
    hearing on this claim now.6 I disagree.
    “[I]f the petitioner was diligent in developing the record in the state habeas
    proceedings, ‘a federal court may grant an evidentiary hearing.”
    Id. at 1320
    ; see
    28 U.S.C. § 2254(e)(2). “‘Diligence depends on whether the prisoner made a
    reasonable attempt, in light of the information available at the time, to investigate
    and pursue claims in state court,’ and ‘will require in the usual case that prisoner,
    at a minimum, seek an evidentiary hearing in state court.’” 
    Burgess, 723 F.3d at 1320
    (alteration omitted) (emphasis omitted). Given the unusual procedural
    6
    The majority refused to grant Jenkins an evidentiary hearing in its original opinion for this
    reason. See 
    Jenkins, 936 F.3d at 1279
    –80.
    77
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    posture of Jenkins’s claim, Jenkins made a reasonable attempt to investigate and
    pursue his Atkins claim in state court.
    The Supreme Court issued Atkins v. Virginia while Jenkins’s petition for
    post-conviction collateral relief was pending before the CCA. The CCA, therefore,
    requested supplemental briefing on the effect, if any, Atkins had on Jenkins’s
    petition. At that point, neither the Alabama Supreme Court nor the Alabama
    legislature had interpreted the groundbreaking case, making Jenkins’s counsel’s
    next step unclear. Jenkins’s counsel nonetheless made a reasonable attempt to
    pursue Jenkins’s Atkins claim—he requested that the CCA “vacate his death
    sentence and remand the case back to the lower court for further proceedings.”
    The request appears even more reasonable when considered alongside procedurally
    analogous cases decided around the same time.
    At the time Jenkins’s counsel was preparing the supplemental briefing, there
    had been three other post-conviction petitions for relief that shared Jenkins’s
    unusual procedural posture. See Clemons v. State, 
    55 So. 3d 314
    (Ala. Crim. App.
    2003); Wood v. State, 
    891 So. 2d 398
    (Ala. Crim. App. 2003); Tarver v. State, 
    940 So. 2d 312
    (Ala. Crim. App. 2004). These three cases are similar to Jenkins’s
    petition in that (1) the petitioners were sentenced to death; (2) the petitioners filed
    Rule 32 petitions; (3) their Rule 32 petitions were dismissed at the trial court level;
    (4) while their appeals before the CCA were pending, Atkins was decided; and
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    (5) given the Atkins decision, each petitioner submitted supplemental briefing. In
    their supplemental briefs, Clemons, Wood, and Tarver each argued that he was
    intellectually disabled under Atkins and thus it would be unconstitutional to
    execute him. None of the petitioners asked for an evidentiary hearing on their
    Atkins claim or requested a remand for further proceedings. Despite the lack of
    request for a hearing, the CCA remanded for an evidentiary hearing in each case.
    With these cases in mind, it would have been reasonable for Jenkins to think
    that broadly stating his Atkins claim would constitute “diligent” pursuit of his
    claim. Nonetheless, Jenkins did more than these other petitioners: he specifically
    requested that the CCA “vacate his death sentence and remand the case back to the
    lower court for further proceedings.” Thus, given “the information available at the
    time,” Jenkins made a “reasonable attempt” to pursue his claim.
    Additionally, in Alabama, post-conviction relief petitioners with factually
    sufficient claims are entitled to an evidentiary hearing. Ala. R. Crim. P. 32.9. So,
    if the CCA had granted Jenkins’s request to remand “for further proceedings,”
    Jenkins would have received an evidentiary hearing. Jenkins’s request that the
    CCA “remand for further proceedings,” then, was effectively equivalent to a
    request for an evidentiary hearing.
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    III.   Conclusion
    Jenkins’s Rule 32 evidentiary hearing spanned three days. Four family
    members testified about his horrific upbringing. Two psychiatrists testified about
    how that upbringing affected Jenkins as an adult. Two prison guards testified
    about Jenkins’s exemplary behavior while in pretrial detention. And one friend
    testified about Jenkins’s character. Evidence introduced also documented
    Jenkins’s academic failings and his juvenile record. In short, Jenkins presented an
    abundance of compelling mitigating evidence. But the jury never heard any of that
    evidence. Downey failed to introduce it at the penalty phase. In fact, Downey
    failed to investigate any mitigating evidence whatsoever. Downey’s failures
    cannot be attributed to strategic decisions. Nor can they be called reasonable. His
    performance can only be described as deficient. And that deficient performance
    was surely prejudicial—there is more than a reasonable probability that the
    horrifying and detailed Rule 32 testimony would have persuaded one juror to vote
    against sentencing Jenkins to death. Jenkins is therefore entitled to habeas relief
    on his ineffective assistance of counsel claim.
    Jenkins is also entitled to a hearing on his Atkins claim. Though Jenkins
    presented ample mitigating evidence at the Rule 32 hearing, he never had an
    opportunity to present evidence concerning (1) his intellectual functioning, (2) his
    adaptive deficits, or (3) whether his potential intellectual disability manifested
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    before he reached 18—the three requirements necessary to establish intellectual
    disability under Alabama law and thus exempt an individual from a death sentence.
    The CCA nonetheless decided to evaluate Jenkins’s Atkins claim, apparently
    believing that the record, which included no direct evidence concerning whether
    Jenkins was intellectually disabled, was sufficient to resolve the complex medical
    issue. In just three sentences, the CCA arrived at a diagnosis: not intellectually
    disabled.
    Despite the insufficient factual record, the majority fails to remand for an
    evidentiary hearing and relies on unrelated, pre-Atkins evidence to deny Jenkins’s
    Atkins claim. Equally troubling, the majority now refuses to consider Jenkins’s
    request for an evidentiary hearing, which he has maintained in the district court
    and this court, and which is properly before this court on appeal. I therefore
    dissent.
    81