United States v. Ernest Romond Gibbs, Jr. , 237 F. App'x 550 ( 2007 )


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  •                                                                        [DO NOT PUBLISH]
    IN THE UNITED STATES COURT OF APPEALS
    FILED
    FOR THE ELEVENTH CIRCUIT U.S. COURT OF APPEALS
    ________________________ ELEVENTH CIRCUIT
    JUNE 26, 2007
    No. 06-10728                        THOMAS K. KAHN
    ________________________                      CLERK
    D. C. Docket No. 03-00636-CR-3-1
    UNITED STATES OF AMERICA,
    Plaintiff-Appellee,
    versus
    ERNEST ROMOND GIBBS, JR.,
    Defendant-Appellant.
    ________________________
    Appeal from the United States District Court
    for the Northern District of Georgia
    _________________________
    (June 26, 2007)
    Before HULL and MARCUS, Circuit Judges, and BARZILAY,* Judge.
    PER CURIAM:
    *
    Honorable Judith M. Barzilay, Judge, United States Court of International Trade, sitting
    by designation.
    Following a jury trial, Defendant Ernest Gibbs appeals his convictions for
    conspiracy to commit robbery (Count One), interference with interstate commerce
    by violence (Count Two), and causing the death of another by using a firearm
    during the commission of a crime of violence, such killing being a murder as
    defined in 18 U.S.C. § 1111 (Count Three), in violation of 18 U.S.C. §§ 1951(a)
    and 924(c)(1)(A), (c)(1)(A)(iii), and (j)(i), respectively. Gibbs also appeals his life
    sentence on Count Three. After review and oral argument, we affirm.
    I. BACKGROUND
    A.     Trial Evidence
    The trial evidence showed that Defendant Gibbs, in concert with Ricky
    Carter, Travis Carter, and Michael Leggett, attempted to rob an armored Bantek
    truck during one of its stops in Atlanta, Georgia on October 3, 2003.1 Thompson
    Ebgon was driving the Bantek truck and was accompanied by two other Bantek
    guards, Moustafa Koura and Izzay Roy Denney. As guards Koura and Denney
    approached the front door of a bank to empty the automatic teller machines,
    Defendant Gibbs and Leggett approached the Bantek guards and opened fire.
    1
    The original indictment in this case was against all four robbers and contained four
    counts. Ricky and Travis Carter and Michael Leggett pled guilty and were prosecution
    witnesses during Defendant Gibbs’s trial. After their guilty pleas, a superseding indictment was
    issued against Defendant Gibbs which had only three counts. The reference to the particular
    counts in this opinion are to the superseding indictment.
    2
    Koura died almost instantly from a gunshot, and Denney was injured.
    Denney ran to a Publix grocery store in the same shopping center to seek
    medical assistance for Koura and alerted the authorities. Defendant Gibbs grabbed
    the bank bag, but the bag was empty and no money was stolen. During the
    exchange Leggett was shot two times but, with Defendant Gibbs’s assistance, fled
    the scene.
    The three robbers hiked through a wooded area surrounding the shopping
    center and emerged onto Cascade Road, where Ricky Carter was waiting in a white
    pickup truck. In an effort to evade the police, the robbers traveled south to Dublin,
    Georgia before seeking medical treatment for Leggett. While en route to Dublin,
    Defendant Gibbs told the other men that he had “laid [his] man down.” When they
    came within range of a local hospital, Travis Carter dialed 911 and explained to the
    operator that his friend Leggett was shot while trying to assist a broken-down
    motorist.
    Ricky Carter called Stacy Grantham, Leggett’s then-girlfriend, and told her
    to come to the hospital. Stacy Grantham and Kelly Sahni, her best friend, followed
    Ricky Carter’s instructions and drove to the hospital. When Leggett was released,
    Grantham, Sahni, and Leggett followed Ricky Carter and Defendant Gibbs, who
    were in the white pickup truck, to an apartment complex in Baxley, Georgia. They
    3
    dropped off Ricky Carter and Gibbs at the complex and returned to Leggett’s home
    in Jessup, Georgia.
    A few days after the robbery, law enforcement officers received a tip from
    James Bennett, Leggett’s cousin, implicating Leggett in the attempted robbery.
    Following this lead, officers discovered that Leggett received treatment at a
    hospital in Dublin for a gunshot wound. On October 12, 2003, Leggett was
    arrested for attempted armed robbery and felony murder. Leggett agreed to
    cooperate with police, confessed to the crimes, and implicated his co-conspirators:
    Ricky Carter, Travis Carter, and Defendant Gibbs.
    B.    Gibbs’s Confession
    On October, 19, 2003, Defendant Gibbs was arrested at his mother’s home.
    Officers transported Gibbs to the Appling County Sheriff’s Office to process and
    interview him. Two FBI agents, Mark Alig and Robert McAllister, along with
    Investigator Jerry Baxley of the Appling County Sheriff’s Office, conducted the
    initial interview of Gibbs in one of the investigator’s offices. Before beginning the
    interview process, FBI Agent Alig removed Gibbs’s handcuffs, read him “the
    charge from the face of the arrest warrant,” provided him with a copy of the
    charge, and gave him a waiver-of-rights form. This form contained the standard
    4
    Miranda warnings,2 including the right to remain silent, to have a lawyer present
    during questioning, and to stop the questioning at any time.
    Gibbs signed the waiver-of-rights form, which we quote in full:
    ADVICE OF RIGHTS
    Place Baxley, GA
    Date 10/17/2003
    Time 9:00 AM
    YOUR RIGHTS
    Before we ask you any questions, you must understand your rights.
    You have the right to remain silent.
    Anything you say can be used against you in court.
    You have the right to talk to a lawyer for advice before we ask you any
    questions.
    You have the right to have a lawyer with you during questioning.
    If you cannot afford a lawyer, one will be appointed for you before any
    questioning if you wish.
    If you decide to answer questions now without a lawyer present, you have
    the right to stop answering at any time.
    WAIVER OF RIGHTS
    I have read this statement of my rights and I understand what my rights are.
    At this time, I am willing to answer questions without a lawyer present.
    * * * * *
    2
    See Miranda v. Arizona, 
    384 U.S. 436
    , 
    86 S. Ct. 1602
    (1966).
    5
    After Defendant Gibbs signed the waiver-of-rights form, Alig, McAllister, and
    Baxley also signed the form as witnesses to Gibbs’s waiver.
    After Gibbs’s waiver, Agent Alig asked Gibbs about the attempted robbery
    that occurred on October 3, 2003. Defendant Gibbs orally confessed to the
    attempted armed robbery and shooting, and Agent Alig described Gibbs’s oral
    confession at trial. Gibbs said that during the ride to Atlanta, he learned of the plan
    to rob the Bantek truck, was provided a .38 caliber revolver, and was instructed
    about his role in the robbery. Defendant Gibbs then implicated his co-conspirators,
    Ricky Carter, Travis Carter, and Michael Leggett. Gibbs admitted to firing a
    number of rounds from his revolver and shooting at least one of the guards.
    After the oral confession, Agent Alig explained to Defendant Gibbs that it
    was FBI policy to document interviews with a written statement or report to
    memorialize the oral confession. Gibbs agreed to provide a statement. Agent Alig
    typed a statement in a first-person narrative, asking Gibbs for additional details and
    clarifying the statement when necessary. Upon completion, Gibbs was asked to
    look over the statement and to determine whether the statement was true and
    accurate to the best of his knowledge. After reviewing the statement for several
    minutes, Gibbs noticed a grammatical error in the statement: the first sentence on
    the second page should have read “guards,” rather than “guard.” Agent Alig used a
    6
    pen to make the change and then initialed it. Gibbs signed and initialed both
    pages, as did the law enforcement agents present. The entire interview process
    took about one and a half hours.
    C.    Suppression Hearing
    Ultimately, Defendant Gibbs pled not guilty and moved to suppress his post-
    arrest confession, arguing that he failed to knowingly and intelligently waive his
    rights under Miranda.
    At the suppression hearing, Gibbs’s counsel elicited testimony from Wynona
    Kennedy and Dr. Lisa Hutchinson Page, Gibbs’s former ninth and tenth grade
    special education teachers in the mid-1990s (i.e., approximately eight years before
    the robbery). Both teachers testified that Gibbs had a specific learning disability in
    the area of reading and written expression and that during their time teaching
    Gibbs, he never read higher than a second grade level. The teachers conceded that
    Gibbs’s verbal communication was at a higher level than his reading and writing
    abilities and that repeated exposure helps students become familiar with concepts.
    The teachers opined that in the ninth and tenth grades, Gibbs would have been
    unable to read the waiver-of-rights form. When they taught Gibbs, he would
    attempt to hide his disability, a behavior commonly known as masking. Gibbs
    dropped out of high school in the eleventh grade.
    7
    Gibbs’s counsel also called a clinical psychologist, Dr. Mark Crawford,
    Ph.D., who had administered multiple tests to determine Gibbs’s reading and
    writing abilities. Specifically, Dr. Crawford performed several subtests from the
    Woodcock-Johnson Test of Achievement.3 According to Dr. Crawford, the results
    of each subtest placed Gibbs’s reading level range between a below-kindergarten
    level and a third grade level.4 Dr. Crawford did not think Gibbs was “malingering”
    because the test results were consistent with Gibbs’s previous education records
    and Gibbs appeared “to put forth [a] good effort.”
    Based on these test results, Dr. Crawford did not believe that Gibbs would
    have been able to read either the waiver-of-rights form or the subsequent written
    statement created by Agent Alig. Dr. Crawford opined that even if Gibbs could
    have phonetically “sounded out” the words to read it aloud, he would not have
    been able to comprehend what he had read. In Dr. Crawford’s opinion, Gibbs
    would not have been able to spot the grammatical error and make the subsequent
    change of “guard” to “guards.”
    Agent Alig and Investigator Baxley testified about Gibbs’s interview and
    3
    Dr. Crawford’s report was not admitted as evidence at the hearing on the motion to
    suppress. However, Dr. Crawford did testify orally as to the tests administered and the results.
    4
    For instance, Dr. Crawford testified that Gibbs’s reading decoding subtest placed him at
    a second grade, third month level; his phonetic decoding subtest placed him below the
    kindergarten level; and his broad reading subtest, which measures overall reading skills, placed
    him at a first grade, nine month level.
    8
    waiver of his rights. Before interviewing Gibbs, Agent Alig asked whether Gibbs
    could read and write the English language, whether he was under the influence of
    any drug or alcohol, and whether he had any other impairment. According to
    Agent Alig, Gibbs himself read the waiver-of-rights form aloud, and Agent Alig
    asked Gibbs if he understood his rights and if he had any questions. Gibbs stated
    that he understood the form and had no questions, and signed the form indicating
    that he waived his rights. However, Investigator Baxley testified that Agent Alig
    also read the waiver-of-rights form aloud to Gibbs and then gave the form to Gibbs
    to read.5 According to Baxley, Gibbs “appeared to read the form” and had it in his
    hands “long enough to read it.”
    In an effort to show Gibbs’s familiarity with the Miranda rights, the
    government also called multiple law enforcement officers who had previously dealt
    with or arrested Gibbs. Officer Anthony Tillman, who knew Gibbs since Gibbs
    was a young child, testified that during the period of 1996 to 2000, Gibbs was
    arrested a total of six times by the Appling County Sheriff’s deputies. Officer
    Tillman dealt with Gibbs on multiple occasions in his capacity as a law
    5
    Defense counsel moved to strike the testimony of Investigator Baxley because he
    testified at the second suppression hearing and was allowed to read the transcript of the
    testimony Agent Alig provided from the first hearing, despite the rule of sequestration being
    invoked. To resolve this dispute the magistrate judge did not rely on Baxley’s testimony
    regarding Gibbs’s interview. Instead, the magistrate judge relied on Agent Alig’s testimony
    from the first hearing.
    9
    enforcement officer and on one occasion in 2001 arrested Gibbs for driving under
    the influence, his seventh arrest. Officer Tillman testified that during the 2001
    arrest Gibbs had no trouble understanding the implied consent rights and that
    Gibbs later offered to make a deal with the police to “work off” his DUI charge.
    Likewise, in 1999, when Officer Myles Moseley of the Baxley police
    arrested Gibbs on rape and kidnaping charges and verbally advised him of his
    Miranda rights, Gibbs had no trouble communicating. During the 1999 arrest,
    Officer Moseley had Gibbs draft a handwritten 26-line statement, which contained
    no punctuation and numerous errors.
    D.    Magistrate Judge’s Report and Recommendation
    Based on the testimony at the suppression hearing, the magistrate judge
    found that Gibbs knowingly and intelligently waived his right to remain silent.
    Because “[Gibbs] did not testify at the suppression hearing, and there is no direct
    evidence that the events did not occur as testified to by Agent Alig,” the magistrate
    judge found that Gibbs read the waiver-of-rights form aloud and stated that he
    understood those rights. The magistrate judge also found that Gibbs’s actions
    “indicated that [he] communicated without difficulty and clearly discussed the
    events resulting in his arrest.”
    The magistrate judge further determined that the testimony of Gibbs’s high
    10
    school teachers about his reading ability and comprehension in the mid-1990s was
    minimally probative as to whether he could have read or understood his Miranda
    rights in October 2003. Likewise, Dr. Crawford’s testimony concerning Gibbs’s
    reading abilities was of questionable validity because Crawford did not ask Gibbs
    to read the waiver-of-rights form, did not discuss these rights with Gibbs, and did
    not attempt to gauge Gibbs’s knowledge and understanding of these rights. The
    magistrate judge concluded that, based on Gibbs’s familiarity with the criminal
    system and the Miranda warnings specifically, and his ability to function at school
    and in the community, Gibbs did not lack the mental capacity to understand and
    waive his rights.
    Gibbs objected to the magistrate judge’s Report and Recommendation
    (“R&R”). On June 30, 2005, the district court overruled Gibbs’s objections and
    adopted the R&R denying his motion to suppress.
    E.    Mental Capacity Evidence
    Before trial, the prosecution filed a motion in limine to exclude any evidence
    of Gibbs’s mental capacity at trial. After hearing arguments from both sides, the
    district court tentatively decided that if Gibbs chose to testify, the testimony of his
    high school teachers would be admissible. The district court explained that
    because no one but Gibbs could testify as to whether, at the time of his 2003
    11
    interview, he could read the waiver-of-rights form or written statement, Gibbs had
    to testify to “lay that predicate before we get into what would otherwise be
    extraneous, collateral and irrelevant material.” The district court explained that,
    without Gibbs’s foundational testimony, the teachers’ and psychologist’s testimony
    would be of “extremely limited” relevance under Federal Rule of Evidence 403,
    “because the jury will then be wondering why in the world are we worried about
    whether Mr. Gibbs can read or not. They are going to start thinking . . . . [t]hat you
    don’t get confessions from illiterate people when we know illiterate people can
    certainly give a voluntary confession.”
    The district court was more troubled by the testimony of Dr. Crawford. The
    district court considered Dr. Crawford’s findings questionable because Gibbs could
    have intentionally failed the reading comprehension tests. Upon further argument,
    the district court reserved ruling on the admissibility of Dr. Crawford’s testimony,
    pending a determination by Gibbs as to whether he would testify. Ultimately,
    Gibbs chose not to testify.
    F.    Sentencing
    At the conclusion of the trial, the jury convicted Gibbs on all three counts.
    The Presentence Investigation Report (“PSI”) assigned Gibbs a base offense level
    of 20, pursuant to U.S.S.G. § 2B3.1(a), for conspiracy to commit robbery (Count
    12
    One) and interference with interstate commerce by violence (Count Two). The PSI
    recommended that Gibbs’s base level be increased by: (1) 2 levels, pursuant to
    U.S.S.G. § 2B3.1(b)(l), because “the property of a financial institution . . . was
    taken, or . . . the taking of such property was an object of the offense”; and (2) 6
    levels, pursuant to U.S.S.G. § 2B3.1(b)(3)(C), based on the death of Koura during
    the robbery.
    The PSI also assigned Gibbs a base offense level of 43, pursuant to U.S.S.G.
    § 2A1.1, for the murder of Koura (Count Three). The PSI recommended that
    Gibbs’s base offense level be increased by 3 levels, pursuant to U.S.S.G. § 3D1.4,
    because he was convicted of three counts. The PSI calculated a criminal history
    category of II based on Gibbs’s prior conviction for DUI on October 28, 2002, and
    because he committed the present offense while still on probation for the prior
    conviction. See U.S.S.G. § 4A1.1(d). With an offense level of 46 and a criminal
    history category of II, the advisory guidelines range was life imprisonment.6
    At the sentencing hearing, the district court heard evidence from a
    psychologist, Dr. Jethro Toomer, Ph.D., who interviewed and tested Gibbs. Dr.
    6
    An offense level of 43 (without the 3-level enhancement to level 46) and any criminal
    history category also yields an advisory guidelines range of life imprisonment. See U.S.S.G. ch.
    5, pt. A (sentencing table).
    13
    Toomer testified that Gibbs was mildly mentally retarded.7 Dr. Toomer based this
    diagnosis on Gibbs’s IQ score of 72 8 and Gibbs’s poor adaptive functioning, such
    as his poor performance in school, lack of abstract reasoning, and inability to make
    appropriate independent choices. The district court also heard evidence that Gibbs
    was raised in an abusive home and provided support to a troubled student while
    playing sports in the eighth grade. Gibbs’s counsel was also given an opportunity
    to explain and address Gibbs’s previous arrests and convictions.
    Gibbs’s counsel objected to the imposition of a life sentence on Count Three
    and argued that Gibbs’s limited mental capacity rendered him less culpable and
    deserving of a downward departure from his advisory guidelines range. Gibbs’s
    counsel also objected to a life sentence based on the sentences of Gibbs’s co-
    conspirators. Both Ricky and Travis Carter received 25-year sentences, while
    Leggett received a 40-year sentence.
    Following the testimony, the district court declined to reduce Gibbs’s
    sentence. The district court examined the 18 U.S.C. § 3553(a) sentencing factors
    7
    Dr. Toomer explained three classifications within a diagnosis of mental retardation:
    “There’s mild mental retardation, which used to be called educable or trainable mental
    retardation. Then there’s moderate, and then there’s profound.” During pre-trial and at trial,
    there was no evidence introduced of Gibbs’s IQ or mild mental retardation. Dr. Toomer did not
    testify until the sentencing hearing.
    8
    On the tests that Toomer administered, Gibbs had a full scale IQ of 72, but a verbal IQ
    of 73 and a performance IQ of 76.
    14
    and concluded that a life sentence was proper. In making this determination, the
    district court considered Gibbs’s mental capacity and his previous acts of kindness.
    However, the district court specifically cited the seriousness of the murder and
    attempted robbery offenses, the need to promote respect for the law, to provide just
    punishment, and to protect the public from further serious violent crimes in its
    decision to impose a life sentence.
    Gibbs timely appealed his convictions and his life sentence on Count Three.                    9
    II. DISCUSSION
    A.     Motion to Suppress
    Gibbs argues that the district court erred in denying his motion to suppress
    his confession because he was never able to read beyond a third grade level, could
    not have actually read the waiver-of-rights form aloud, could not have understood
    the waiver-of-rights form even if he mouthed the words aloud, and thus his waiver
    was not knowing and intelligent.10 See United States v. Glover, 
    431 F.3d 744
    , 748
    (11th Cir. 2005) (“The government had to prove by a preponderance of the
    evidence that the defendant waived his rights ‘voluntarily, knowingly, and
    9
    The district court sentenced Gibbs to 240 months on Counts One and Two to run
    consecutively. On appeal Gibbs has not challenged those sentences.
    10
    “Because rulings on motions to suppress involve mixed questions of fact and law, we
    review the district court’s factual findings for clear error, and its application of the law to the
    facts de novo.” United States v. Bervaldi, 
    226 F.3d 1256
    , 1262 (11th Cir. 2000). We construe
    all facts in the light most favorable to the United States. See 
    id. 15 intelligently.’”)
    (citations omitted).
    The problem for Gibbs is that the government presented evidence that Gibbs
    actually read the waiver-of-rights form aloud, stated that he understood his rights
    and had no questions, and signed the waiver. Gibbs himself did not testify at the
    suppression hearing. The government’s evidence also showed that Gibbs had
    experience with the criminal justice system, had been read his rights before, and
    had the mental capacity to make a knowing and voluntary waiver. Even Dr.
    Crawford testified that Gibbs could read to some extent, and Dr. Crawford never
    had Gibbs try to read the waiver-of-rights form. It is undisputed that there is no
    evidence of police intimidation or coercion during Gibbs’s interview. Indeed,
    Gibbs does not claim his confession was not voluntary, but only that his waiver
    was not knowingly and intelligently made.
    Accordingly, given the totality of the circumstances, we cannot say that the
    magistrate judge clearly erred in finding that Gibbs read the waiver-of-rights form,
    understood the waiver, and knowingly and intelligently waived his rights or that
    the district court clearly erred in adopting the magistrate judge’s R&R. Therefore,
    Gibbs has failed to show that the district court erred in denying his motion to
    suppress his confession. See Moore v. Dugger, 
    856 F.2d 129
    , 134-35 (11th Cir.
    1988).
    16
    B.     Exclusion of Testimony
    Even if his confession was properly admitted into evidence, Gibbs next
    argues that it was still for the jury to determine the reliability and credibility of his
    confession. He contends that the district court erred in excluding Dr. Crawford’s
    and the two teachers’ testimony regarding his poor reading ability and their
    opinions that he could not read or understand the waiver form and his written
    confession statement. Gibbs asserts that the evidence was relevant because (1) his
    reading ability was the core issue regarding whether he gave the alleged
    confession, and (2) he could have used the evidence to impeach Agent Alig’s
    testimony. Gibbs asserts that the exclusion of this evidence violated his Sixth
    Amendment right to present a complete defense under Crane v. Kentucky, 
    476 U.S. 683
    , 
    106 S. Ct. 2142
    (1986).11
    11
    “We review a district court’s evidentiary rulings for abuse of discretion.” United States
    v. Baker, 
    432 F.3d 1189
    , 1202 (11th Cir. 2005), cert. denied, __ U.S. __, 
    126 S. Ct. 1809
    (2006).
    A district court abuses its discretion when its decision “rests upon a clearly erroneous finding of
    fact, an errant conclusion of law, or an improper application of law to fact.” 
    Id. As a
    practical
    matter, however, “the abuse of discretion standard means that the district court has a range of
    choice. . . . We recognize a significant range of choice for the district court on evidentiary issues,
    which is to say we defer to its decisions to a considerable extent.” United States v. Brown, 
    415 F.3d 1257
    , 1265 (11th Cir. 2005), cert. denied, 
    547 U.S. 1023
    , 
    126 S. Ct. 1570
    (2006). Finally,
    even if the district court committed an error, we will not reverse if the error was harmless. See
    
    Baker, 432 F.3d at 1202
    .
    We need not decide whether, as the government contends, Gibbs failed to raise his
    constitutional Crane argument in the district court in order to determine whether plain error
    review applies. Even applying de novo review, we will not reverse the district court due to this
    kind of constitutional error if it was harmless. See 
    Crane, 476 U.S. at 691
    , 106 S. Ct. at 2147.
    Thus, we consider Gibbs’s Crane argument with the rest of our harmless-error analysis.
    17
    In this case, it is undisputed that the teachers’ interaction with Gibbs was
    approximately eight years before his confession in issue and that none of the
    witnesses–the teachers or Dr. Crawford–gave Gibbs either the waiver form or
    confession to see if he could read them. Accordingly, the potential witnesses had
    no personal knowledge as to whether Gibbs read or actually understood the waiver
    form or his written confession. Further, Gibbs never testified that he could not
    read the waiver form or his written confession. Absent the potential witnesses
    giving the waiver form or confession to Gibbs, or Gibbs laying a foundation with
    his testimony, we cannot say that the district court abused its discretion in its
    evidentiary ruling. Specifically, the district court did not abuse its discretion in
    balancing the evidence’s probative and prejudicial value and determining that,
    without Gibbs’s testimony that he could not read the waiver form or his written
    confession, the potential relevance of this evidence would be outweighed by its
    danger to confuse the issues or mislead the jury. See Fed. R. Evid. 403.
    Gibbs’s reliance on Crane is misplaced. The Crane Court only addressed the
    voluntariness of the defendant’s confession, which goes to the veracity of the
    confession in the first instance. See 
    Crane, 476 U.S. at 687-88
    , 
    691, 106 S. Ct. at 2145
    , 2147 (describing how defendant sought to introduce evidence that his
    confession was coerced by “paint[ing] a picture of a young, uneducated boy who
    18
    was kept against his will in a small, windowless room for a protracted period of
    time until he confessed to every unsolved crime in the county, including the one
    for which he [was] convicted”). Gibbs produced no evidence of intimidation or
    coercion, and voluntariness is not at issue here.
    Further, the district court did not go so far as to say any evidence about
    Gibbs’s ability to read was completely irrelevant; rather, the district court indicated
    that such evidence, absent Gibbs’s own testimony, was lacking foundation in this
    particular case. This is not the kind of blanket exclusion prohibited by Crane. See
    
    id. at 690,
    106 S. Ct. at 2146.
    Finally, even if the district court erred in its evidentiary ruling, such error
    was harmless. Agent Alig testified in detail about Gibbs’s initial oral confession.
    There is no evidence that Gibbs did not give an oral confession, and thus the
    subsequent typed statement was cumulative. Gibbs’s poor reading ability relates
    more directly to his written confession than his verbal confession. We recognize
    that Gibbs argues that if he impeached Alig’s testimony about the written
    statement, the jury may have questioned the reliability of Alig’s testimony about
    the oral confession. However, the relevance of Gibbs’s reading ability to the
    accuracy or reliability of the oral confession is, at a minimum, significantly
    attenuated.
    19
    More importantly, Agent Alig’s testimony about Gibbs’s oral confession and
    the evidence of Gibbs’s written confession were fully consistent with, and
    corroborated by, the detailed testimony of his co-conspirators, the witnesses at the
    hospital, and the victims of the robbery attempt. Three of Gibbs’s co-conspirators
    testified that Gibbs joined them in the robbery, that Gibbs fired his gun, and that
    Gibbs grabbed the money bag and helped Leggett back to the getaway vehicle. All
    three men also testified that Gibbs boasted that he shot one of the guards.
    Grantham and Sahni testified that they saw Gibbs with the other conspirators at the
    hospital, along with the white pickup truck that a witness to the robbery had seen.
    The surviving victims’ descriptions of the robbery attempt also corroborated the
    details in Gibbs’s confession. Given the substantial evidence beyond Gibbs’s
    confession about his role in the robbery attempt and shooting, any error in
    excluding evidence of Gibbs’s reading abilities, without further foundation, was
    harmless.
    C.    Reasonableness of the Sentence
    Post-Booker,12 a sentencing court must first consult the Sentencing
    Guidelines and correctly calculate the advisory guidelines range for the defendant’s
    offense. United States v. Talley, 
    431 F.3d 784
    , 786 (11th Cir. 2005); United States
    12
    United States v. Booker, 
    543 U.S. 220
    , 
    125 S. Ct. 738
    (2005).
    20
    v. Crawford, 
    407 F.3d 1174
    , 1178-79 (11th Cir. 2005). Gibbs admits that the
    district court correctly calculated his advisory guidelines range as life
    imprisonment for his murder offense in Count Three.
    However, Gibbs contends that his life sentence is unreasonable because the
    district court: (1) totally ignored one of the 18 U.S.C. § 3553(a) factors, to wit,
    Gibbs’s characteristics and specifically his mild mental retardation; and (2)
    improperly discounted Dr. Toomer’s testimony about Gibbs’s mild mental
    retardation when the court stated that Gibbs did not seem “to be retarded in the
    sense of the word that we commonly use” but “was clearly a slow learner.”
    Alternatively, even assuming that the district court actually considered Gibbs’s
    mild mental retardation, Gibbs argues that his life sentence still is unreasonable
    because (1) the district court erred in not accepting that Gibbs’s mild mental
    retardation diminished his personal culpability for the murder and entitled him to a
    reduced sentence below life imprisonment; and (2) an unwarranted sentencing
    disparity exists between Gibbs and his codefendants. Before addressing Gibbs’s
    arguments, we outline the standards that govern our post-Booker review of Gibbs’s
    sentence and what happened at Gibbs’s sentencing hearing.
    1.     Standard of Review
    Post-Booker, we review a defendant’s total sentence for reasonableness in
    21
    light of the factors found in § 3553(a), which include:
    (1) the nature and circumstances of the offense and the history and
    characteristics of the defendant; (2) the need to reflect the seriousness
    of the offense, to promote respect for the law, and to provide just
    punishment for the offense; (3) the need for deterrence; (4) the need to
    protect the public; (5) the need to provide the defendant with needed
    educational or vocational training or medical care; (6) the kinds of
    sentences available; (7) the Sentencing Guidelines range; (8) pertinent
    policy statements of the Sentencing Commission; (9) the need to
    avoid unwanted sentencing disparities; and (10) the need to provide
    restitution to victims.
    
    Talley, 431 F.3d at 786
    (citing 18 U.S.C. § 3553(a)); see also United States v.
    Williams, 
    435 F.3d 1350
    , 1353 (11th Cir. 2006). This “reasonableness” review is
    deferential, and we “evaluate whether the sentence imposed by the district court
    fails to achieve the purposes of sentencing as stated in section 3553(a).” 
    Talley, 431 F.3d at 788
    .
    While the district court must consider the factors listed in § 3553(a), the
    judge is not required to discuss each factor on the record. 
    Id. at 786;
    United States
    v. Scott, 
    426 F.3d 1324
    , 1329 (11th Cir. 2005) (“[N]othing in Booker or elsewhere
    requires the district court to state on the record that it has explicitly considered
    each of the § 3553(a) factors or to discuss each of the § 3553(a) factors.”); see also
    
    Williams, 435 F.3d at 1353-54
    (citing Scott and explaining that “a laundry list of
    § 3553(a) factors is not required”). Rather, “an acknowledgment by the district
    court that it has considered the defendant’s arguments and the factors in section
    22
    3553(a) is sufficient under Booker.” 
    Talley, 431 F.3d at 786
    .
    Further, “there is a range of reasonable sentences from which the district
    court may choose,” and the burden of demonstrating unreasonableness rests with
    the party challenging the sentence. 
    Id. at 788.
    “The weight to be accorded any
    given § 3553(a) factor is a matter committed to the sound discretion of the district
    court,” and “[w]e will not substitute our judgment in weighing the relevant
    factors . . . .” United States v. Williams, 
    456 F.3d 1353
    , 1363 (11th Cir. 2006),
    petition for cert. filed, (U.S. Oct. 19, 2006) (No. 06-7352).
    Although a sentence within the advisory guidelines range is not per se
    reasonable, we ordinarily will expect such a sentence to be reasonable. 
    Talley, 431 F.3d at 788
    . Finally, in reviewing a sentence, “[w]e do not apply the
    reasonableness standard to each individual decision made during the sentencing
    process; rather, we review the final sentence for reasonableness.” United States v.
    Winingear, 
    422 F.3d 1241
    , 1245 (11th Cir. 2005).
    2.     Gibbs’s Sentencing Hearing
    We review the testimony presented at sentencing and then detail the district
    court’s comments about the § 3553(a) factors.
    The sentencing court first heard the testimony of Dr. Toomer, a
    psychologist, about why he diagnosed Gibbs as having mild mental retardation.
    23
    As noted earlier, Dr. Toomer indicated that there were three classifications of
    mental retardation: (1) mild mental retardation, which Dr. Toomer said “used to be
    called educable or trainable mental retardation”; (2) moderate mental retardation;
    and (3) profound mental retardation. On the tests that Dr. Toomer administered to
    Gibbs at age twenty-five, Gibbs had a full scale IQ of 72, with a verbal IQ of 73
    and a performance IQ of 76. Dr. Toomer testified that the IQ scores for mild
    mental retardation are 70 to 75.13
    Dr. Toomer further explained that for a person to be diagnosed as mildly
    mentally retarded, it was not enough to have an IQ score of 70-75 and instead the
    person must also have “adaptive functioning deficits” with an onset prior to age
    eighteen. As to adaptive functioning deficits, Dr. Toomer opined that Gibbs had
    “ongoing deficits in terms of academic functioning,” as outlined in his school
    records, such that Gibbs was in special education and learning disabled classes and
    was not able to pass the graduation tests. In Dr. Toomer’s testing, Gibbs read at a
    third grade level and performed arithmetic at a fifth grade level.
    Dr. Toomer also opined that Gibbs had adaptive functioning deficits in the
    13
    The Supreme Court has stated that “‘[m]ild’ mental retardation is typically used to
    describe people with an IQ level of 50-55 to approximately 70.” Atkins v. Virginia, 
    536 U.S. 304
    , 308 n.3, 
    122 S. Ct. 2242
    , 2245 n.3 (2002). Dr. Toomer, however, explained that “there is
    considered to be a standard error of measurement of plus or minus five points in terms of the IQ
    score,” which is apparently why Dr. Toomer used the upper end as 75 and concluded that
    Gibbs’s IQ score of 72 fell within the range of mild mental retardation.
    24
    work area. According to Dr. Toomer, “what we have found with Mr. Gibbs is that
    he worked–he held jobs, there were several jobs reflected in the record that he held,
    but if you look at the jobs, the jobs mainly consist of what we refer to as basic
    repetitive skills” and “don’t require any abstract reasoning . . . .”
    Dr. Toomer acknowledged that Gibbs had higher IQ scores prior to age
    twenty-five. For example, Gibbs had IQ scores of 82 at age nine and 80 at age
    twelve but then 72 at age fifteen. Dr. Toomer admitted that there were
    inconsistencies between his testing of Gibbs as having a 72 IQ versus the school
    officials’ two earlier testings showing Gibbs’s IQ as 82 and then 80. However, Dr.
    Toomer did not have the raw data and subtests from the earlier tests to make
    comparisons between those tests and his. Dr. Toomer testified that, in his opinion,
    the IQ scores of 82 and 80 were just “out there,” while the 72 IQ score in his
    testing was more consistent with the corroborative data he had from interviewing
    Gibbs’s family members and reviewing Gibbs’s school records.
    After Dr. Toomer’s testimony, the district court heard testimony from Keith
    Johnson, Gibbs’s eighth grade football coach. Johnson stated that Gibbs was “a
    tremendous athlete and a good kid, and he just had a big heart.” Johnson explained
    how, in eighth grade, Gibbs helped Bryan Carter, another student. Carter had
    depression, anxiety, and agoraphobia and was a waterboy for Gibbs’s football
    25
    team. Gibbs befriended Carter. When Gibbs was told that he was going to receive
    the MVP award for the football season, Gibbs asked his coach to give the award to
    Carter instead. Johnson recounted how Gibbs’s befriending and having Carter win
    the MVP award changed Carter’s life dramatically.14
    After hearing this testimony about Gibbs, the district court judge listed each
    of the statutory § 3553(a) factors and stated that she was guided by the statutory
    criteria in sentencing Gibbs, as follows:
    I am guided by the statutory criteria, which I have written down.
    I must look at the nature and circumstances of the offense and
    the offender; I must consider a sentence that will reflect the
    seriousness of the offense so that it will promote respect for the law
    and provide just punishment for the offense; a sentence that will
    afford adequate deterrence to criminal conduct; protect the public
    from further crimes; and, a sentence that will provide the defendant
    with adequate educational, vocational training opportunities, and the
    like. So those are the standards.
    (Emphasis added). The record is thus clear that the district court judge looked to
    both the nature of the offense and the characteristics of the offender in sentencing
    Gibbs. In considering those factors, the district court started with the nature of the
    offense, and found that Gibbs’s felony murder offense involved the taking of
    human life and is the most serious kind of crime, as follows:
    14
    Bryan Carter’s mother, Julie Carter, confirmed this story. Ms. Carter testified that this
    friendship was a transformative moment for Bryan Carter, who then went to the prom, graduated
    from high school and technical college, and is a productive working citizen.
    26
    All right. We’ll start first applying those standards to Mr.
    Gibbs.
    . . . We are talking about a felony murder. We are talking about
    a situation that was premeditated where I don’t believe–I don’t know
    for sure, but I don’t believe that the defendants went in with a notion
    that they were necessarily going to assassinate or execute people.
    However, they went in with guns, and at the first obstacle, the obstacle
    being the guards having guns themselves, they started firing. Now, I
    don’t know if the firing was planned, that I don’t know, but they
    started firing.
    So it is clearly a felony murder situation. It is the most serious
    kind of crime one can have to take the life of one human being, and it
    was just happenstance that Mr. Denney [the second victim shot in the
    attempted robbery] was alive and is over in Iraq fighting now, because
    he could have been killed just as well. So it’s extremely, extremely
    serious. And in examining the nature and circumstances of the
    offense, there can be no offense that is more serious than murder.
    I’ll talk about offenders in just a minute.
    ....
    To reflect the seriousness of the offense, to promote respect for
    the law, obviously you want to send a message to society that if you
    are going to do something as bad as armed robbery, you don’t take the
    second step, which is gunning down the guards, who are making nine
    or [ten dollars] an hour just trying to support their family, to effectuate
    that robbery.
    The district court then considered the need for just punishment, deterrence, and
    protection of the public, which are all § 3553(a) factors, as follows:
    To provide just punishment, it seems to me, again, absent
    exceptional circumstances in any robbery like this where the
    defendants intentionally shoot a gun and kill someone, just
    punishment calls for a life sentence.
    To afford adequate deterrence to criminal conduct, it is the
    same, the same consideration. One wants to communicate to the
    public that life is precious and that we as a society take it very
    seriously. When someone robs another person of their life, we want
    27
    to deter that by saying the most severe penalty possible will be given
    when that happens. . . .
    To protect the public from further crimes; again, we are talking
    about people willing to take the lives of others, and there’s no
    reasonable assurance they wouldn’t do the same thing if they were out
    on the street again.
    The district court next considered the offenders’ characteristics and whether
    there was something different about the offenders,15 as follows:
    Now that’s what I think is the paradigm sentence in this case,
    life imprisonment. The question then is there something different
    about these offenders or what happened here that should make me
    deviate from what I think should be the sentence in 99 percent of the
    cases like this.
    In regard to Gibbs’s characteristics, the district court specifically considered
    Gibbs’s mental capacity and his being a slow learner, as follows:
    Turning first to Mr. Gibbs, there has been much talk and
    discussion of the fact that–I would call him a slow learner. I’ve seen a
    lot of these reports before. He does not seem to me to be retarded in
    the sense of the word that we commonly use, but he clearly does seem
    to be a slow learner.
    The district court then considered other evidence about Gibbs’s characteristics,
    including his kindness with Bryan Carter, as follows:
    We also heard from folks from Baxley, Appling County, about
    the very kind thing [Gibbs] did back in middle school, and it does
    seem to me to be a very touching incident. And I suspect if someone
    had treated my child who was in such trouble that way, I would be in
    15
    The district court sentenced Gibbs and his codefendant Leggett during the same
    sentencing hearing.
    28
    court to communicate that story as well. I know, notwithstanding
    what Mr. Gibbs has done since, you all remain grateful for that, and I
    appreciate and I am sure he appreciates you coming.
    But as you can understand, there is more to a life than one act
    of kindness in middle school and, sadly, Mr. Gibbs has chosen to go a
    different way since that rather heartwarming story. And the other
    things we have heard about him have not been so good, and some of
    them have been pretty bad, of course the worst being this particular
    incident.
    When I evaluate the mitigating factors, I have to get back to the
    fact of the seriousness of this offense and to my need to protect the
    public.
    During the sentencing hearing, Gibbs’s attorney argued that Gibbs’s mental
    retardation resulted in impulsive behavior and an inability to think about
    consequences, and that his mild mental retardation made him less personally
    culpable than other defendants and entitled him to a sentence reduction. In
    response, the district court judge noted, however, that: (1) under the § 3553(a)
    statutory factors, she also was expressly required to consider a defendant’s
    dangerousness and the protection of the public, and (2) these same traits also made
    Gibbs more dangerous, as follows:
    [Gibbs’s counsel]: . . . . [M]entally retarded persons frequently
    know the difference between right and wrong and are competent to
    stand trial. However, because of their impairments by definition, they
    have diminished capacities to understand and process information, to
    communicate, . . . to abstract from mistakes and learn from
    experience, to engage in logical reasoning, to control impulses, and to
    understand the reactions of others.
    . . . [T]here is no evidence that they are more likely to engage in
    29
    criminal conduct than others, but there is abundant evidence that they
    often act on impulse rather than pursuing a premeditated plan, and that
    in a group setting they are followers rather than leaders.
    ....
    The Court: But don’t you contradict yourself? If he’s a fellow
    that’s just sitting around waiting to have somebody tell him to go
    commit a violent act, he’s always ready to erupt at any time if he’s so
    suggestible.
    [Gibbs’s counsel]: What I’m saying is that he, based on Dr.
    Toomer’s diagnosis and testimony, he does not have the ability to
    think about consequences.
    The Court: Which makes him more dangerous.
    [Gibbs’s counsel]: But the Supreme Court recognizes that
    because of their limited mental diminished capacity that that, in fact,
    makes them less culpable than someone who is engaged in the same
    act but that’s not been diagnosed.
    The Court: I’m supposed to look at danger and protecting the
    public. That’s one of my criteria.
    (Emphasis added). In response to defense counsel’s argument that Gibbs’s
    behavior was aberrant and that he was just a “follower,” the district court observed
    that Gibbs had other violent conduct in his criminal history.
    In arguing for a life sentence and against a reduction due to Gibbs’s mental
    capacity, the government stressed that: (1) with his prior arrests and convictions,
    Gibbs knew by this murder in October 2003 that violence leads to arrests; (2)
    Gibbs was employable, had a long history of employment, and was functioning in
    society; (3) Gibbs was able to get a gun, could shoot, and participated in a robbery;
    and (4) Gibbs was able to recount the details of his offenses to Agent Alig.
    After considering the § 3553(a) factors, the district court ultimately
    30
    sentenced Gibbs to life imprisonment. With this background, we now turn to
    Gibbs’s arguments on appeal.
    3.     Gibbs’s Arguments
    On appeal, Gibbs’s first argument is that the district court totally ignored one
    of the § 3553(a) factors, to wit, Gibbs’s mild mental retardation. We disagree
    because the record as a whole shows that the district court did consider all of the
    § 3553(a) factors, including Gibbs’s characteristics. Moreover, the district court
    here went far beyond what is required by actually discussing each § 3553(a) factor
    on the record. See 
    Talley, 431 F.3d at 786
    (“[A]n acknowledgment by the district
    court that it has considered the defendant’s arguments and the factors in section
    3553(a) is sufficient under Booker.”); 
    Scott, 426 F.3d at 1329
    (“[N]othing in
    Booker or elsewhere requires the district court to state on the record that it has
    explicitly considered each of the § 3553(a) factors or to discuss each of the
    § 3553(a) factors.”). While Gibbs may well disagree with the weight the district
    court gave his mild mental retardation, Gibbs has not shown that the district court
    failed to consider his characteristics or traits.
    We also reject Gibbs’s second argument that the district court erred in its
    consideration of Dr. Toomer’s testimony by finding that Gibbs seems “to be a slow
    learner” and is not “retarded in the sense of the word that we commonly use.”
    31
    Although Dr. Toomer tested Gibbs’s IQ as being 72, even Dr. Toomer admitted
    that Gibbs had prior IQ scores of 82 and 80. And Dr. Toomer himself
    acknowledged that mild mental retardation was previously called “educable”
    mental retardation. Moreover, the evidence at sentencing also showed that Gibbs
    performed to some degree in school, played football well, and had a long history of
    employment. The sentencing judge tried the case; heard about Gibbs’s ability to
    participate in the robbery, shooting, and escape; and observed Gibbs’s abilities and
    conduct during trial. The district court did not disregard Dr. Toomer’s testimony,
    but instead considered it along with all the other evidence presented at trial and at
    sentencing. Given the district court’s role as a factfinder and the overall evidence,
    we cannot say that Gibbs has shown any reversible error in the district court’s
    consideration of Dr. Toomer’s testimony or in its factfinding that Gibbs was
    basically a slow learner and not seriously retarded.
    Gibbs’s third argument is that the district court erred in not accepting that
    Gibbs’s mild mental retardation entitled him to a reduced sentence because it
    diminished his personal culpability for the murder. We agree with the premise of
    Gibbs’s argument: the district court indeed rejected his counsel’s argument that his
    mild mental retardation was a mitigating factor that entitled him to a reduced
    sentence. Instead, with the knowledge that Gibbs had murdered Koura and had
    32
    prior violent conduct, the district court observed that Gibbs’s impulsivity and
    inability to think about consequences–which Gibbs’s counsel argued stemmed
    from his mild mental retardation–make him more dangerous to the public and
    warrant a sentence that would protect the public. Thus, the question becomes
    whether, in applying the § 3553(a) sentencing factors in a murder case, a district
    court errs when it considers the defendant’s diminished-mental-capacity traits of
    impulsivity and inability to think of consequences as a factor that makes the
    murder defendant more dangerous and warrants a sentence that will protect the
    public.
    We start our analysis with the Sentencing Guidelines, which expressly
    address the role of diminished mental capacity in sentencing, because § 3553(a)
    directs district courts to consult and consider the Sentencing Guidelines and the
    pertinent policy statements of the Sentencing Commission. 18 U.S.C.
    § 3553(a)(4), (5).
    Specifically, § 5K2.13 of the Sentencing Guidelines provides that a
    downward departure may be warranted if “(1) the defendant committed the offense
    while suffering from a significantly reduced mental capacity; and (2) the
    significantly reduced mental capacity contributed substantially to the commission
    33
    of the offense.”16 U.S.S.G. § 5K2.13. However, § 5K2.13 further provides that the
    district court may not depart below the applicable guidelines range if the offense
    involved actual violence, as follows:
    the court may not depart below the applicable guidelines range if . . .
    [(1)] the facts and circumstances of the defendant’s offense indicate a
    need to protect the public because the offense involved actual violence
    or a serious threat of violence; [or (2)] the defendant’s criminal
    history indicates a need to incarcerate the defendant to protect the
    public . . . .
    
    Id. Both the
    Sentencing Guidelines and case law are clear that a § 5K2.13
    downward departure may not be based on diminished mental capacity where the
    defendant committed a violent crime. See United States v. Salemi, 
    26 F.3d 1084
    ,
    1087 (11th Cir. 1994) (“While it is undisputed that Salemi had a history of mental
    illness, the guidelines and the case law are clear in stating that mental and
    emotional conditions should not be considered if the defendant committed a violent
    crime.”); United States v. Russell, 
    917 F.2d 512
    , 517 (11th Cir. 1990) (“[W]e think
    that the guidelines show that the Commission considered the effect of emotional
    16
    Section 5K2.13 further states: “[s]imilarly, if a departure is warranted under this policy
    statement, the extent of the departure should reflect the extent to which the reduced mental
    capacity contributed to the commission of the offense.” U.S.S.G. § 5K2.13. The Application
    Note to § 5K2.13 provides that for purposes of this policy statement, “[s]ignificantly reduced
    mental capacity” means “the defendant, although convicted, has a significantly impaired ability
    to (A) understand the wrongfulness of the behavior comprising the offense or to exercise the
    power of reason; or (B) control behavior that the defendant knows is wrongful.” U.S.S.G.
    § 5K2.13 cmt. n.1.
    34
    conditions on culpability and decided that ordinarily mental and emotional
    conditions are irrelevant to mitigate defendants’ culpability, but that in
    extraordinary instances the condition may be relevant–but then only if the
    defendant committed a nonviolent crime.”). Thus, in calculating Gibbs’s advisory
    guidelines range, the district court could not have granted a § 5K2.13 downward
    departure based on diminished mental capacity because Gibbs’s offense clearly
    involved actual violence that indicated a need to protect the public. This perhaps
    explains why Gibbs did not make a § 5K2.13 motion for a downward departure
    based on his diminished mental capacity.
    Given that nothing in the advisory Sentencing Guidelines helps him, Gibbs
    relies only on the Supreme Court’s decision in Atkins v. Virginia, 
    536 U.S. 304
    ,
    
    122 S. Ct. 2242
    (2002). For several reasons, Atkins does not help Gibbs either.
    First, Atkins addressed only the constitutional issue of “whether the death
    penalty should ever be imposed on a mentally retarded criminal.” 
    Id. at 307,
    122
    S. Ct. at 2244. Gibbs has made no constitutional claim in this case. Further,
    Atkins does not address, much less contradict, the sentencing policies in the
    advisory Sentencing Guidelines, which do not permit downward departures due to
    diminished mental capacity when the defendant’s offense involved actual violence.
    Second, Atkins involved policy concerns about the death penalty and not
    35
    generalized sentencing. The petitioner Atkins had a full scale IQ score of 59 and
    was sentenced to death for capital murder. 
    Id. at 307-09,
    122 S. Ct. at 2244-45.
    The Supreme Court noted that retribution is one justification given for the death
    penalty; that under a retribution theory, the culpability of the individual offender is
    relevant; and that the average murderer is not subject to the death penalty. 
    Id. at 318-19,
    122 S. Ct. at 2251. The Supreme Court stressed that the death penalty is
    reserved for a very narrow category of the most serious crimes and reasoned that if
    “the culpability of the average murderer is insufficient to justify the most extreme
    sanction available to the State, the lesser culpability of the mentally retarded
    offender surely does not merit that form of retribution.” 
    Id. at 319,
    122 S. Ct. at
    2251. The Supreme Court also noted its concern that “[m]entally retarded
    defendants in the aggregate face a special risk of wrongful execution.” 
    Id. at 321,
    122 S. Ct. at 2252.
    The Supreme Court’s concerns in Atkins regarding the heightened level of
    culpability required for the death penalty are not present here because this is not a
    capital case. See Harris v. McAdory, 
    334 F.3d 665
    , 668 n.1 (7th Cir. 2003) (“A
    cursory glance at Atkins reveals that the Court was addressing the issue of mental
    retardation solely in the context of capital punishment.”).17 The Supreme Court’s
    17
    The Supreme Court has continually recognized a distinction between capital and
    noncapital sentences. See, e.g., Harmelin v. Michigan, 
    501 U.S. 957
    , 994-96, 
    111 S. Ct. 2680
    ,
    36
    determination that mentally retarded criminals, like average murderers, lack the
    personal culpability to be eligible for the death penalty, which is reserved for the
    most heinous murder crimes, does not mean that such criminals’ diminished
    culpability always should affect other kinds of sentencing calculations. All the
    Supreme Court concluded in Atkins was that mentally retarded murderers were not
    personally culpable enough to deserve the retribution of execution, especially
    given that most murderers do not receive the death penalty. Gibbs fails to cite any
    case that applies Atkins outside the death penalty context.
    Although neither § 5K2.13 nor Atkins helps Gibbs, we do live in a post-
    Booker world where the guidelines range is now only advisory. Indeed,
    “Booker restored to district courts a measure of discretion that the mandatory
    Guidelines had removed.” United States v. Hunt, 
    459 F.3d 1180
    , 1184 (11th Cir.
    2006). “This discretion is bounded, of course, by Congress’s mandate to consider
    the factors in section 3553(a), one of which, subsection four, is the Sentencing
    Guidelines.” 
    Id. Accordingly, after
    correctly calculating the advisory guidelines
    range, “‘the district court may impose a more severe or more lenient sentence as
    long as the sentence is reasonable.’” 
    Williams, 435 F.3d at 1353
    (quoting
    
    Crawford, 407 F.3d at 1179
    ). Thus, in this case, the district court had authority to
    2701-02 (1991) (discussing the “qualitative difference between death and all other penalties”).
    37
    impose a sentence below the advisory guidelines range of life imprisonment based
    on the § 3553(a) factors, including Gibbs’s characteristics. However, the district
    court was not required to sentence below the advisory guidelines range but was
    required only to consider the § 3553(a) factors, which the district court clearly did.
    Here, the district court simply weighed certain § 3553(a) factors (such as the
    seriousness of the crime and the need to protect the public) more heavily than
    others (such as Gibbs’s diminished mental capacity) and chose to impose the
    advisory guidelines sentence of life imprisonment. Given that Gibbs caused the
    death of Koura in this case and had other violent acts in his criminal history, we
    cannot say that the district court erred in (1) noting that Gibbs’s impulsiveness and
    inability to think of consequences also made him more dangerous, and (2) giving
    significant weight to the need to protect the public, one of the § 3553(a) factors.
    Because the weight to be given to each factor is committed to the sound discretion
    of the district court, “[w]e will not substitute our judgment in weighing the relevant
    factors . . . .” 
    Williams, 456 F.3d at 1363
    .
    As to his fourth argument, Gibbs has not shown any unwarranted sentencing
    disparity. Gibbs’s codefendants all pled guilty and testified for the government but
    still received very substantial sentences (40 years’ imprisonment for Leggett, who
    also had a gun, and 25 years’ imprisonment each for Ricky and Travis Carter). We
    38
    note that while Leggett and Ricky and Travis Carter pled guilty to, and were
    sentenced on, several offenses, including the conspiracy to commit robbery, they
    did not plead guilty to the murder of Koura. Because the jury convicted Gibbs of
    the murder of Koura, this alone defeats Gibbs’s sentence-disparity claim.
    For all of these reasons, we cannot say that Gibbs has carried his burden to
    show that his life sentence for the murder in Count Three is unreasonable.
    III. CONCLUSION
    For all of the foregoing reasons, we affirm Gibbs’s convictions on all three
    counts and his sentence on Count Three.
    AFFIRMED.
    39