United States v. Kelvin Johnson ( 2021 )


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  •                                      PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 19-4331
    UNITED STATES OF AMERICA,
    Plaintiff – Appellee,
    v.
    KELVIN JOHNSON,
    Defendant – Appellant.
    No. 19-4338
    UNITED STATES OF AMERICA,
    Plaintiff – Appellee,
    v.
    SYKEBIA STEWART,
    Defendant – Appellant.
    Appeals from the United States District Court for the Northern District of West Virginia,
    at Martinsburg. Gina M. Groh, Chief District Judge. (3:17-cr-00007-GMG-RWT-1; 3:17-
    cr-00007-GMG-RWT-2)
    Argued: December 11, 2020                                       Decided: April 30, 2021
    Before GREGORY, Chief Judge, and KING and DIAZ, Circuit Judges.
    Vacated and remanded by published opinion. Judge King wrote the opinion, in which
    Chief Judge Gregory and Judge Diaz joined.
    ARGUED: Aaron David Moss, OFFICE OF THE FEDERAL PUBLIC DEFENDER,
    Martinsburg, West Virginia; Edward Ryan Kennedy, ROBINSON & MCELWEE, PLLC,
    Clarksburg, West Virginia, for Appellants. Timothy David Helman, OFFICE OF THE
    UNITED STATES ATTORNEY, Martinsburg, West Virginia, for Appellee. ON BRIEF:
    Kristen M. Leddy, Assistant Federal Public Defender, OFFICE OF THE FEDERAL
    PUBLIC DEFENDER, Martinsburg, West Virginia, for Appellants. William J. Powell,
    United States Attorney, Wheeling, West Virginia, Traci M. Cook, Assistant United States
    Attorney, OFFICE OF THE UNITED STATES ATTORNEY, Clarksburg, West Virginia,
    for Appellee.
    2
    KING, Circuit Judge:
    Following a jury trial in June 2018 in the Northern District of West Virginia,
    defendants Kelvin Johnson and Sykebia Stewart were convicted of distributing heroin that,
    when used, resulted in the death of 18-year-old Jorge Armando Mercado-Medrano.
    Johnson was also convicted of a second offense, for distributing heroin to 22-year-old Joel
    Custer. The district court sentenced Johnson to 365 months in prison and Stewart to 293
    months. On appeal, the defendants have raised numerous contentions of error, including
    arguments related to the Government’s failure to disclose and preserve Medrano’s cell
    phone and the prosecution’s presentation of evidence that Custer, like Medrano, died soon
    after using heroin provided by Johnson.
    With respect to Medrano’s cell phone, we conclude that the district court erred by
    relying on an incomplete evidentiary record to reject the defendants’ claim that the
    Government’s failure to disclose and preserve the cell phone constituted a denial of due
    process. We also discuss the court’s refusal to instruct the jury that it could draw an adverse
    inference from the loss of the cell phone, but we do not resolve whether the court thereby
    committed further error. Regarding Custer, we conclude that the court erred in allowing
    the irrelevant and prejudicial evidence of Custer’s death.         We therefore vacate the
    defendants’ convictions and sentences, and remand for further proceedings. 1
    1
    We have also reviewed — and hereby reject — Stewart’s contention that she is
    entitled to a judgment of acquittal on the basis of insufficient evidence. We do not reach
    and decide the defendants’ other arguments, that the Government’s rebuttal closing
    argument deprived the defendants of a fair trial and that Johnson’s sentence is procedurally
    unreasonable.
    3
    I.
    A.
    In January 2017, the grand jury in northern West Virginia returned its Indictment
    against Johnson and Stewart. See United States v. Johnson, No. 3:17-cr-00007 (N.D. W.
    Va. Jan. 18, 2017), ECF No. 1. In Count One, Johnson was charged with the distribution
    of heroin to Custer, in contravention of 
    21 U.S.C. § 841
    (a)(1), (b)(1)(C) (the “Distribution
    Count”). More specifically, the Distribution Count alleges that
    [o]n or about May 28, 2016, in Berkeley County, in the Northern District of
    West Virginia, defendant KELVIN JOHNSON, did unlawfully, knowingly,
    intentionally, and without authority distribute a mixture and substance
    containing a detectable amount of heroin, a Schedule I controlled substance,
    to a person known to the Grand Jury.
    See Indictment 1 (emphasis omitted). In Count Two, Johnson and Stewart were jointly
    charged with the distribution of heroin that resulted in the death and serious bodily injury
    of Medrano, in contravention of 
    21 U.S.C. § 841
    (a)(1), (b)(1)(C) and 
    18 U.S.C. § 2
     (the
    “Death Count”). For its part, the Death Count alleges that
    [o]n or about May 30, 2016, in Berkeley County, in the Northern District of
    West Virginia, defendants KELVIN JOHNSON and SYKEBIA STEWART,
    aided and abetted by each other, did unlawfully, knowingly, intentionally,
    and without authority distribute a mixture and substance containing a
    detectable amount of heroin, a Schedule I controlled substance, to a person
    known to the Grand Jury and death and serious bodily injury resulted from
    the use of the heroin.
    See Indictment 2 (emphasis omitted).
    The Death Count contains a statutory enhancement element specifying that “if death
    or serious bodily injury results from the use of such substance [the defendant] shall be
    sentenced to a term of imprisonment of not less than [20] years or more than life.” See 21
    
    4 U.S.C. § 841
    (b)(1)(C). As a result of that enhancement element, the Death Count provides,
    upon conviction, for a mandatory minimum sentence of 20 years and a maximum of life.
    The Distribution Count, on the other hand, does not allege the enhancement element. Thus,
    the Distribution Count does not have a mandatory minimum sentence and provides for a
    maximum penalty of 20 years.
    B.
    Following the return of the Indictment, Johnson and Stewart entered into plea
    agreements with the United States Attorney. Pursuant to her plea agreement, Stewart
    agreed to plead guilty to a one-count Information that charged her with the distribution of
    heroin and did not include the enhancement element for causing death or serious bodily
    injury. Stewart’s plea agreement provided that she would receive a binding sentence of 96
    months and that the United States Attorney would recommend dismissal of the Indictment
    against her. On April 4, 2017, Stewart appeared before a magistrate judge to plead guilty
    to the Information. The magistrate judge’s order related that he “accepted Defendant’s
    plea of guilty and deferred accepting the terms of the plea agreement and adjudicating
    Defendant guilty.” See United States v. Stewart, No. 3:17-cr-00026 (N.D. W. Va. Apr. 4,
    2017), ECF No. 12.
    Two weeks later, on April 18, 2017, Johnson appeared before the magistrate judge
    to plead guilty to the Distribution Count of the Indictment. Pursuant to his plea agreement,
    Johnson and the United States Attorney agreed to a binding sentence of 180 months. The
    United States Attorney also agreed that he would recommend dismissal of the Death Count
    after Johnson was sentenced on the Distribution Count. The magistrate judge accepted
    5
    Johnson’s plea of guilty to the Distribution Count and deferred to the district court to decide
    whether to accept the plea agreement and adjudge Johnson guilty.
    Following the plea proceedings before the magistrate judge, the district court
    scheduled the defendants’ sentencing hearing for August 7, 2017. At the outset of the
    August 7 hearing, Stewart’s sentencing was continued generally. Turning to Johnson’s
    case, the court rejected his plea agreement. The court ruled that the plea agreement was
    not “in this community’s best interests” and failed to “do justice for these victims [Medrano
    and Custer].” See J.A. 81. 2 After the court rejected the plea agreement, Johnson withdrew
    his guilty plea without objection.
    Several months later, on April 11, 2018, Stewart moved to withdraw from her plea
    agreement, and the district court conducted a prompt hearing on the issue. Stewart
    indicated that she did not want to testify against Johnson and desired to go to trial with him
    on the Death Count of the Indictment. After warning Stewart of the potential consequences
    of her request, the court allowed Stewart to withdraw from her plea agreement and to
    2
    In explaining its reasons for rejecting Johnson’s plea agreement, the district court
    cited, inter alia, the Government’s failure to consult with Medrano’s and Custer’s families
    before offering Johnson the binding 180-month sentence. The court also expressed a belief
    that Johnson deserved a longer prison term. Although Johnson did not plead guilty to
    causing Medrano’s death and the Government conceded it could not prove causation with
    respect to Custer’s, the court suggested that Johnson should be more severely penalized
    because he “contribut[ed] to the death of two young men.” See J.A. 80. In apparent tension
    with the principle that “[a] court may not enhance a sentence based on bias against out-of-
    state defendants,” see United States v. McCall, 
    934 F.3d 380
    , 382 (4th Cir. 2019), the court
    also indicated that Johnson, who resided in Baltimore and travelled about 100 miles to
    allegedly distribute heroin in West Virginia, merited a harsher penalty for “coming into
    this state from Maryland and fanning our heroin epidemic,” see J.A. 80. (Citations herein
    to “J.A. __” refer to the contents of the Joint Appendix filed by the parties in these appeals.)
    6
    withdraw her guilty plea. The court also granted the Government’s subsequent motion to
    dismiss the Information against Stewart.
    C.
    As detailed more fully below, the Government did not recover any of the substance
    that Johnson and Stewart allegedly sold to Medrano or any of the substance that Johnson
    allegedly provided to Custer, so the Government has relied on other evidence to prove that
    each of those substances was heroin. The Government has also highlighted similarities
    between the Medrano and Custer cases, including toxicology reports indicating that both
    Medrano and Custer ingested heroin, among other known and possible drugs. For their
    defense on the Death Count, Johnson and Stewart have not disputed that they sold some
    substance to Medrano — as activities surrounding the sale were documented in a video
    shared on the social media service Snapchat — but the defendants have disputed that the
    substance was heroin and that it caused Medrano’s death. With respect to the Distribution
    Count, Johnson has maintained that he did not provide heroin or any other substance to
    Custer.
    In the pretrial proceedings, it emerged that the Government had been in possession
    of Medrano’s cell phone but did not disclose the cell phone to the defendants. It was also
    revealed that the Government returned the cell phone to Medrano’s family after the
    magistrate judge accepted Johnson’s plea of guilty to the Distribution Count and before the
    district court rejected his plea agreement. Once Johnson knew he was going to trial on the
    Death and Distribution Counts, he sought the cell phone to support the defense on the Death
    Count that Medrano’s death may have resulted from the use of drugs other than the heroin
    7
    the defendants allegedly sold him. According to Medrano’s father, however, the family
    misplaced the cell phone after receiving it from the Government and thus could not produce
    it.
    Johnson moved for dismissal of the Death Count on the ground that the
    Government’s failure to disclose and preserve the cell phone constituted a denial of due
    process. Stewart later joined in that motion, following her decision to withdraw her guilty
    plea to a simple distribution offense and go to trial with Johnson on the Death Count. On
    June 18, 2018, the day before the trial began, the district court denied the defendants’
    motion to dismiss the Death Count after allowing only limited evidence to be presented
    concerning the contents and disappearance of Medrano’s cell phone.
    Johnson and Stewart’s trial took five days, between June 19 and June 26, 2018.
    During the trial, the district court denied the request — initially made by Johnson and
    subsequently endorsed by Stewart — for an instruction on the Death Count that would have
    advised the jury that it could draw an adverse inference from the Government’s loss of
    Medrano’s cell phone. Over Johnson’s objection, the court also allowed the Government
    to present the evidence with respect to the Distribution Count that Custer, like Medrano,
    died soon after using heroin provided by Johnson.
    The jury returned guilty verdicts against Johnson on the Distribution Count and both
    Johnson and Stewart on the Death Count. In April 2019, the district court sentenced
    Johnson to 293 months in prison on the Death Count (above the 20-year statutory
    minimum) and 240 months on the Distribution Count (the 20-year statutory maximum).
    By designating 72 months of the Distribution Count sentence to be served consecutively to
    8
    the Death Count sentence, the court imposed the total term of imprisonment of 365 months
    (more than twice the binding 180-month sentence in Johnson’s plea agreement). At a
    separate hearing, the court sentenced Stewart to 293 months in prison on the Death Count
    (more than three times the binding 96-month sentence in her plea agreement). The
    defendants timely noted these appeals, and we possess jurisdiction pursuant to 
    28 U.S.C. § 1291
     and 
    18 U.S.C. § 3742
    .
    II.
    We first address Johnson and Stewart’s contentions related to the Death Count and
    the loss of Medrano’s cell phone. The defendants argue on appeal that the Government’s
    failure to disclose and preserve the cell phone contravened their due process rights and
    deprived them of a fair trial. Additionally, the defendants maintain that — even if the
    Government’s conduct with respect to the cell phone did not rise to the level of a due
    process violation — the district court erred in refusing to give the jury an adverse inference
    instruction.
    A.
    As a backdrop for our analysis of the defendants’ contentions, we begin with a brief
    discussion of relevant legal principles. Unquestionably, a criminal “defendant has a
    constitutionally protected privilege to request and obtain from the prosecution evidence
    that is . . . material to the guilt of the defendant.” See California v. Trombetta, 
    467 U.S. 479
    , 485 (1984) (citing Brady v. Maryland, 
    373 U.S. 83
    , 87 (1963)). “Even in the absence
    of a specific request, the prosecution has a constitutional duty to turn over exculpatory
    9
    evidence that would raise a reasonable doubt about the defendant’s guilt.” 
    Id.
     (citing
    United States v. Agurs, 
    427 U.S. 97
    , 112 (1976)). The suppression of material exculpatory
    evidence violates the right to due process, “irrespective of the good faith or bad faith of the
    prosecution.” See Brady, 
    373 U.S. at 87
    .
    A criminal defendant may prove a due process violation based on the prosecution’s
    failure to preserve evidence if the evidence “possess[es] an exculpatory value that was
    apparent before the evidence was destroyed” and if it is “of such a nature that the defendant
    would be unable to obtain comparable evidence by other reasonably available means.” See
    Trombetta, 
    467 U.S. at 489
    . A showing of bad faith is required, however, when the lost
    evidence can only be said to be “potentially useful” to the defendant because the contents
    of the evidence are unknown. See Arizona v. Youngblood, 
    488 U.S. 51
    , 57-58 (1988)
    (holding “that unless a criminal defendant can show bad faith on the part of the police,
    failure to preserve potentially useful evidence does not constitute a denial of due process
    of law”).
    Even absent a due process violation, a criminal defendant may be entitled to an
    adverse inference instruction pursuant to the spoliation of evidence rule. Under that
    evidentiary rule, “an adverse inference may be drawn against a party who [loses or]
    destroys relevant evidence.” See Vodusek v. Bayliner Marine Corp., 
    71 F.3d 148
    , 155 (4th
    Cir. 1995). In order to draw the inference, there must be “a showing that the party knew
    the evidence was relevant to some issue at trial and that his willful conduct resulted in its
    loss or destruction.” 
    Id. at 156
    .
    10
    B.
    With the foregoing legal principles in mind, we turn to a fuller description of the
    factual and procedural history related to Medrano’s missing cell phone.
    1.
    As was eventually clarified during Johnson and Stewart’s June 2018 trial, the
    Government obtained Medrano’s cell phone from his father on the day of Medrano’s death.
    Medrano died in his bedroom in his family’s Berkeley County home on the morning of
    May 31, 2016, after allegedly using heroin that he purchased from the defendants the
    previous night in the defendants’ room at a local Motel 6. Under the trial evidence,
    Medrano and three of his friends used the defendants’ heroin — by snorting it — in the
    same motel room where they acquired it. One of Medrano’s friends shared the video on
    Snapchat that documented activities within the motel room. There was also evidence that
    Medrano left the motel after midnight with additional heroin that no witness saw him use
    and that was not recovered. On the basis of that evidence, the Government deduced that
    Medrano snorted the additional heroin in his bedroom that morning. According to the state
    autopsy report, Medrano’s cause of death was heroin intoxication.
    During the initial police response to the Medrano home, Medrano’s father provided
    Medrano’s cell phone to Deputy J.M. Whitehead of the Berkeley County Sheriff’s
    Department. Deputy Whitehead then promptly turned the cell phone over to West Virginia
    11
    State Police Investigator Brian Bean, who was the principal investigator assigned to the
    case. 3
    That same day, Investigator Bean interviewed Medrano’s girlfriend, who showed
    Bean the Snapchat video documenting activities within the defendants’ room at the Motel
    6. Medrano’s girlfriend also showed Bean text messages on her cell phone that she and
    Medrano had exchanged during the early morning hours after Medrano left the motel and
    before he died. In those texts, Medrano indicated that he was upset and unwell. When
    pressed by his girlfriend for more information, Medrano responded at 2:28 a.m. that “[t]hey
    laced something.” See J.A. 124. He elaborated at 2:46 a.m. — in what we refer to herein
    as the “‘laced blunt’ text” — that he had “smoked a lace[d] blunt and didn’t know.” See
    
    id.
     4
    Investigator Bean preserved images from Medrano’s girlfriend’s cell phone of the
    Snapchat video and the text messages, including the “laced blunt” text. Of course, the
    “laced blunt” text indicated that Medrano used drugs other than the defendants’ alleged
    heroin shortly before his death, as Medrano reportedly snorted the defendants’ heroin but
    smoked the laced blunt. In addition to obtaining the “laced blunt” text, Bean learned from
    the friends who had been with Medrano on the night of May 30 and in the early morning
    hours of May 31, 2016, that he had sent multiple texts seeking to purchase drugs from at
    Investigator Bean was employed with the West Virginia State Police as a civilian
    3
    investigator. He previously was a trooper with the state police for 25 years.
    As explained at trial, a laced blunt is a marijuana cigarette or cigar laced with
    4
    another drug.
    12
    least two sources other than the defendants. Nevertheless, Bean testified at the trial that he
    never made any effort to review the contents of Medrano’s cell phone, by obtaining a search
    warrant or otherwise. Moreover, both Bean and Deputy Whitehead omitted any mention
    of the cell phone from their written reports concerning the police response to the Medrano
    home and investigation of Medrano’s death.
    2.
    At some point, the Government provided Johnson and Stewart with the images
    preserved by Investigator Bean of the Snapchat video and the “laced blunt” text and other
    text messages from the cell phone belonging to Medrano’s girlfriend. In its discovery
    disclosures, however, the Government failed to divulge that it was in possession of
    Medrano’s cell phone. Indeed, the Government’s initial disclosure of February 15, 2017,
    made pursuant to Federal Rule of Criminal Procedure 16 and the local rules of the Northern
    District of West Virginia, asserted that the Government was “unaware of any exculpatory
    evidence in this matter.” See United States v. Johnson, No. 3:17-cr-00007, at 3 (N.D. W.
    Va. Feb. 15, 2017), ECF No. 34. The same disclosure also stated that the “physical exhibits
    either seized from defendants or which the United States intends to use in its case-in-chief
    at trial may be viewed by contacting” either Investigator Bean or another named state police
    investigator. Id. at 2.
    On September 1, 2017, less than a month after the district court’s rejection of his
    plea agreement, Johnson requested further discovery from the Government, including
    production of Medrano’s cell phone. Because Johnson could only surmise that the cell
    phone had been secured during the police investigation, he asserted “[u]pon information
    13
    and belief” that the “Government is in possession of [Medrano’s] cell phone.” See J.A.
    117. Johnson specifically sought “disclosure of any forensic analysis of the phone if it
    exists and the opportunity to have the cell phone produced for independent forensic
    analysis.” Id.
    In its response of September 13, 2017, the Government acknowledged for the first
    time that it had possessed Medrano’s cell phone. The Government stated, however, that it
    could not produce the cell phone because it had “been returned to [Medrano’s] family.”
    See J.A. 120. The Government further responded that it was “not aware of any forensic
    examination of this object.” Id.
    On March 6, 2018, Johnson filed the motion to dismiss the Death Count, arguing
    that the Government’s failure to disclose and preserve Medrano’s cell phone constituted a
    denial of due process because of the cell phone’s exculpatory value. In the alternative,
    Johnson requested an instruction explaining to the jury that it could draw an adverse
    inference from the Government’s loss of the cell phone. 5 By his motion, Johnson sought
    an evidentiary hearing regarding the suppression and disposal of the cell phone by the
    Government.
    5
    The adverse inference instruction that Johnson requested in the March 2018
    motion stated that “[i]f you find that the [government] has . . . allowed to be destroyed or
    lost any evidence whose content or quality are in issue, you may infer that the true fact is
    against the [government’s] interest.” See United States v. Johnson, No. 3:17-cr-00007, at
    11 n.1 (N.D. W. Va. Mar. 6, 2018), ECF No. 97 (alterations in original) (quoting instruction
    cited approvingly in Youngblood, 488 U.S. at 59-60 (Stevens, J., concurring in the
    judgment)).
    14
    Three days later, on March 9, 2018, Johnson filed a motion for a subpoena duces
    tecum to compel Medrano’s parents to produce Medrano’s cell phone. Although the
    district court authorized the subpoena on March 22, 2018, the parents did not produce the
    cell phone. Thus, on June 1, 2018, Johnson filed a motion for a show cause hearing on the
    parents’ failure to comply with the subpoena.
    Also on June 1, 2018, Johnson submitted his proposed jury instructions for the
    impending trial, which included a revised adverse inference instruction entitled “Missing
    Evidence.” See United States v. Johnson, No. 3:17-cr-00007, at 23 (N.D. W. Va. June 1,
    2018), ECF No. 202. That proposed instruction stated: “If you find that the government
    could have produced evidence and that this evidence would have been material in deciding
    facts in dispute in this case, then you are permitted, but not required, to infer that this
    evidence would have been favorable to the defendant.” Id.
    3.
    The district court addressed Medrano’s missing cell phone during a show cause
    hearing and pretrial conference conducted on June 18, 2018.
    a.
    During the June 18, 2018 hearing, the district court first took up the motion —
    brought by Johnson and now joined by Stewart — to dismiss the Death Count based upon
    the Government’s failure to disclose and preserve Medrano’s cell phone. With respect to
    that motion, the district court did not allow the defendants to call and examine any
    witnesses, including Investigator Bean and Deputy Whitehead. Rather, the court relied on
    representations of fact made by the prosecutors. The court also heard the parties’ legal
    15
    arguments, which incorporated principles enunciated by the Supreme Court in Brady,
    Agurs, Trombetta, and Youngblood.
    (1)
    In their presentation, Johnson and Stewart explained that Medrano’s cell phone
    “was not mentioned in the initial Rule 16 discovery at all” and that “[i]t was a scavenger
    hunt to even figure out that [the Government] had the phone.” See J.A. 214 (suggesting
    that Government suppressed material exculpatory evidence in violation of its obligations
    under Brady and Agurs). The defendants also asserted that the cell phone’s exculpatory
    value was apparent “on day one of the investigation or shortly thereafter.” Id. at 205. To
    support their assertion that the exculpatory value of the cell phone was immediately
    apparent, the defendants underscored that Medrano’s girlfriend showed Investigator Bean
    text messages on her cell phone that she had just exchanged with Medrano, including the
    “laced blunt” text indicating that Medrano had used drugs other than the defendants’
    alleged heroin. The defendants also highlighted that Medrano’s friends informed Bean that
    Medrano had been sending texts seeking drugs from sources other than the defendants.
    The defendants summarized that Investigator Bean knew early in the investigation
    of “drug activity on Mr. [Medrano’s cell] phone” that was “different than any activity that
    was alleged against Mr. Johnson or Ms. Stewart.” See J.A. 206. According to the
    defendants, not only was the exculpatory value of the cell phone therefore apparent, but
    the cell phone “was of such a nature that [the defendants were] unable to obtain comparable
    evidence by reasonably available means.” Id. at 207. The defendants argued that, in those
    circumstances, the Government’s failure to disclose and preserve the cell phone
    16
    contravened their due process rights and entitled them to dismissal of the Death Count. See
    id. (invoking Trombetta and contending that the district court did not “even need to get to
    the bad faith analysis to find the due process violation here”).
    In any event, the defendants maintained that they could prove bad faith on the part
    of the Government if such a showing were necessary, i.e., if the district court determined
    that Medrano’s cell phone contained only potentially exculpatory evidence (rather than
    evidence of apparent exculpatory value). Specifically, the defendants asserted that they
    could “show that the Government acted in bad faith by its total failure to follow established
    procedure” in its handling of the cell phone. See J.A. 209 (arguing that because they could
    prove bad faith, they were yet entitled to Death Count’s dismissal for denial of due process
    under Youngblood).
    To demonstrate the Government’s bad faith, the defendants pointed to the
    following:
    ●      The Government seemingly attempted to “hide” Medrano’s cell
    phone by excluding it from discovery disclosures and omitting it from
    the police investigation reports, see J.A. 205;
    ●      Although cell phones are routinely preserved and analyzed in drug
    distribution and overdose cases, the Government inexplicably failed
    to preserve and analyze Medrano’s cell phone;
    ●      The Government also failed to preserve and analyze other potentially
    exculpatory Death Count evidence, including a pipe found in
    Medrano’s bedroom with apparent drug residue;
    ●      Meanwhile, the Government’s handling of Medrano’s cell phone was
    markedly different than its by-the-book handling of the cell phone
    belonging to Custer, the alleged heroin recipient in the Distribution
    Count against Johnson;
    17
    ●      With respect to Custer’s cell phone, an investigator wrote a report
    detailing his receipt of the cell phone from Custer’s father, including
    “how the cell phone was received, who it was received from, when it
    was received, where it was received, and what was done with it after
    that receipt,” id. at 202;
    ●      The investigator requested and obtained a consent to search Custer’s
    cell phone from Custer’s father, and the Government then performed
    a forensic analysis of the cell phone;
    ●      When Custer’s cell phone was eventually returned to Custer’s father,
    the investigator documented the return in a property disposition
    report;
    ●      The Government voluntarily provided Johnson with the documents
    pertaining to Custer’s cell phone, including the investigators’ reports,
    the consent to search, and the forensic analysis;
    ●      The Government’s proper handling of Custer’s cell phone was similar
    to its handling of yet another cell phone, belonging to a Distribution
    Count witness; but
    ●      When it came to Medrano’s cell phone, as the defendants stressed to
    the district court: “[W]e have no reports of investigation. We have
    no memos in the file. We have no consent to search electronic media.
    No chain of custody. No property disposition reports. No forensic
    analysis of that phone,” id. at 204.
    Along with emphasizing the foregoing evidence of bad faith, the defendants requested to
    call and examine witnesses prior to any ruling on the bad faith issue. The defendants
    specified that they sought to question Investigator Bean and Deputy Whitehead “to
    determine exactly why or for what reason . . . no procedure was followed with regard to”
    Medrano’s cell phone. Id. at 210.
    (2)
    In its presentation during the hearing, the Government disclaimed any notion that it
    suppressed Medrano’s cell phone in violation of its obligations under Brady and Agurs.
    18
    Rather, the Government submitted that the defendants were to blame for failing to request
    production of the cell phone before it was returned to Medrano’s family. See J.A. 210
    (asserting that Johnson “had months in which he could have requested the phone” and
    “obtained an independent examination” but he “[d]id not do so”). Seemingly referring to
    Medrano’s cell phone, the Government also proclaimed — contrary to the record — that
    “it’s clear in the reports that a phone was seized.” Id. at 215. Otherwise, the Government
    insisted that its “policy is not to hide evidence” and that it properly placed the onus on the
    defendants to request to see the cell phone pursuant to the notation in its initial Rule 16
    disclosure “that the defense can view physical evidence by calling” Investigator Bean. Id.
    But see United States v. Johnson, No. 3:17-cr-00007, at 2-3 (N.D. W. Va. Feb. 15, 2017),
    ECF No. 34 (statements in the Rule 16 disclosure that the Government was “unaware of
    any exculpatory evidence in this matter” and that the defendants could view the “physical
    exhibits . . . which the United States intends to use in its case-in-chief at trial”).
    Responding to the defendant’s claim under Trombetta that the Government deprived
    them of due process by failing to preserve Medrano’s cell phone, the Government
    maintained that the cell phone had apparent exculpatory value only insofar as it contained
    the “laced blunt” text. The Government elaborated that because it provided the defendants
    with comparable evidence — the image of the “laced blunt” text taken from Medrano’s
    girlfriend’s cell phone — it did not contravene the defendants’ constitutional rights by
    failing to preserve the “laced blunt” text as it existed on Medrano’s cell phone.
    According to the Government, all other contents of Medrano’s cell phone were
    unknown and thus just potentially exculpatory evidence for which there could be no relief
    19
    absent a showing of the Government’s bad faith conduct under Youngblood. Those
    contents included the text messages that Medrano’s friends said Medrano sent to sources
    other than the defendants seeking drugs other than the defendants’ alleged heroin. With
    respect to Medrano’s texts to other drug sources, the Government acknowledged that the
    witness testimony that Medrano sent such texts was “not perfect” and not truly comparable
    evidence to the actual texts that went missing with Medrano’s cell phone. See J.A. 211-
    12.
    The Government argued, however, that “there’s absolutely no bad faith here.” See
    J.A. 212. In that regard, the Government advised the district court that Investigator Bean
    returned Medrano’s cell phone to Medrano’s family following Johnson’s April 2017 guilty
    plea to the magistrate judge because the family had repeatedly requested the cell phone and
    Bean “believed the case was over.” Id. at 211-12. That is, Bean mistakenly believed the
    court would accept the plea agreement with the binding 180-month sentence and thus
    returned the cell phone to Medrano’s family. The Government offered to call Bean to
    testify if the court “would like to hear from [him] about when he obtained and returned that
    phone.” Id. at 213. Notably, the Government did not provide any explanation or offer any
    witness as to why the cell phone was not analyzed, why there was no mention of it in the
    police investigation reports, and why other cell phones, including Custer’s, were handled
    differently.
    (3)
    Without allowing any witnesses, the district court promptly announced from the
    bench its denial of the defendants’ motion to dismiss the Death Count. In its brief
    20
    explanation of its ruling, the court provided a single reason for rejecting the claim that the
    Government unconstitutionally failed to disclose and preserve Medrano’s cell phone: the
    “significant bit of information” that the cell phone was “readily available” for inspection
    by the defendants from the time of the Indictment in January 2017 until Johnson’s guilty
    plea in April 2017. See J.A. 213.
    The district court did not mention the circumstances emphasized by the defendants,
    including that the Government inexplicably opted not to analyze Medrano’s cell phone,
    that the cell phone was conspicuously absent from the Government’s discovery disclosures
    and the police investigation reports, and that the Government had followed different and
    proper procedures in handling other cell phones in this same case. Furthermore, the court
    did not squarely address the defendants’ suggestion that the Government suppressed
    Medrano’s cell phone in violation of its obligations under Brady and Agurs, or the
    defendants’ theory that the Government defied Trombetta by disposing of the cell phone
    despite its apparent exculpatory value and the unavailability of comparable evidence.
    Rather, the district court only explicitly discussed the defendants’ contention that
    they were entitled to dismissal of the Death Count under Youngblood based upon the
    Government’s bad faith conduct in failing to preserve Medrano’s cell phone. The court
    pronounced that because it found there was only “potentially useful evidence on that
    phone,” there was no due process violation absent a showing of bad faith. See J.A. 213.
    And on the bad faith issue, the court determined that the fact that Investigator Bean “held
    on to [the cell phone] until after [Johnson’s] change of plea hearing” precluded any finding
    that the cell phone “was intentionally withheld for the purpose of depriving the
    21
    [defendants] of the use of that evidence during [their] criminal trial.” Id. Strikingly, the
    court ruled that there was not “even negligent handling of evidence,” much less “any bad
    faith.” Id. at 213-14.
    b.
    Later in the June 18, 2018 hearing, the district court dealt with the failure of
    Medrano’s parents to comply with Johnson’s subpoena for Medrano’s cell phone. On that
    matter, the court did allow a witness — Medrano’s father — who explained that the family
    “wanted [the cell phone] back for pictures that [Medrano] took and stuff like that.” See
    J.A. 255. Medrano’s father recounted that once Investigator Bean returned the cell phone,
    the family “looked through pictures” and then “put [the cell phone] to the side,” as they did
    not “have any use for it.” Id. at 258. Medrano’s father also specified that the family
    believed “the case was over at that point” and assumed that was “why [they] received the
    phone back.” Id.
    Sometime after the family set Medrano’s cell phone aside, according to Medrano’s
    father, the cell phone was apparently packed with other household items in preparation for
    the family’s move out-of-state later in June 2018. Medrano’s father testified that the
    subpoena prompted him to search through the moving boxes that he deemed most likely to
    hold the cell phone — boxes being temporarily held in a storage unit and at a relative’s
    house — but he had not found the cell phone during that search.
    At the conclusion of Medrano’s father’s testimony, Johnson argued that the choice
    not to “look in every box” constituted non-compliance with the subpoena. See J.A. 262.
    The district court ruled, however, that Medrano’s parents “complied substantially with
    22
    what they were asked to do” and “did not fail to comply with the subpoena for their son’s
    cell phone.” Id. at 263. 6
    4.
    The Government presented evidence at the June 2018 trial that a chance encounter
    between Medrano and Stewart at a local McDonald’s on the night of May 30, 2016, led to
    Medrano and his friends’ purchase of heroin from Johnson and Stewart in the defendants’
    room at the nearby Motel 6. The Government’s evidence was that, while in the motel room,
    Medrano and three of his friends each snorted about the same amount of heroin, i.e., a
    single line; Medrano thereafter left the motel with additional heroin that he may have
    snorted out of the sight of any witnesses. To prove that the substance was actually heroin
    and that it caused Medrano’s death, the Government relied on evidence that, inter alia,
    Johnson referred to the substance as “boy” (a slang term for heroin), the three friends
    developed symptoms of heroin intoxication (such as difficulty concentrating, drowsiness,
    and vomiting) while still at the motel, and two of the friends were subsequently
    hospitalized.
    In response, the defendants highlighted evidence suggesting that their substance was
    not heroin and that Medrano’s death and his friends’ hospitalizations were caused by heroin
    or other drugs obtained from other sources.         That included evidence that the non-
    hospitalized friend felt well enough to go to school the next day, one of the two hospitalized
    6
    During the June 18, 2018 hearing, the district court indicated that it would withhold
    ruling on Johnson’s request for an adverse inference instruction related to Medrano’s
    missing cell phone until the court heard the trial evidence.
    23
    friends tested negative for heroin, and Medrano himself showed no signs of heroin
    intoxication at the Motel 6. To the contrary, Medrano was described as being “really hyped
    up,” see J.A. 1086, and he drove without apparent difficulty over the 60- to 90-minute
    period after he left the motel, dropping off two of the friends at two different locations,
    driving others to a restaurant for breakfast, and then heading home. Taking into account
    that both Medrano and the second hospitalized friend tested positive for heroin, a defense
    theory was that Medrano and that friend used heroin together after leaving the motel,
    perhaps by way of the laced blunt referenced in the “laced blunt” text Medrano sent his
    girlfriend; that such heroin had been acquired from a local drug dealer Medrano had
    reportedly been texting; and that the friend was concealing the real source of the heroin to
    protect himself and the local drug dealer, who was so close to the friend that he had been
    living with the friend’s family.
    During the trial, Investigator Bean finally testified about his receipt and possession
    of Medrano’s cell phone. On cross-examination, Bean admitted that he was aware early in
    the investigation that the cell phone contained evidence that Medrano used drugs other than
    the defendants’ alleged heroin prior to his death on the morning of May 31, 2016. That
    evidence included the “laced blunt” text from Medrano to his girlfriend, plus Medrano’s
    friends’ reports that Medrano had sent multiple text messages to drug sources other than
    the defendants. The defense elicited that, despite Bean’s possession of Medrano’s cell
    phone and knowledge of evidence contained therein, Bean did not “attempt to do any
    analysis of that phone” and did not “look[] into that phone” in an effort “to follow any of
    those leads.” See J.A. 856.
    24
    The defense also prompted Investigator Bean to agree that proper investigatory
    procedures include “document[ing] the evidence that you find.” See J.A. 845. When asked
    by the defense, “If you don’t write something down, it didn’t happen,” Bean responded,
    “That’s correct, sir.” Id. at 846. Bean was subsequently compelled to admit, however, that
    his “investigation report doesn’t mention [Medrano’s cell] phone.” Id. at 856.
    Significantly, the defense did not question Investigator Bean about the
    Government’s failure to preserve Medrano’s cell phone, apparently out of concern that the
    district court would allow Bean to inform the jury that the cell phone was returned to
    Medrano’s family following Johnson’s prior guilty plea. See J.A. 839 (bench conference
    discussion as to whether cross-examination about the cell phone would “open the door to
    the plea”). That tactic proved to be troublesome for the defendants with respect to the
    pending request for an adverse inference instruction. Specifically, during the charge
    conference at the close of the Government’s case-in-chief, Johnson and Stewart jointly
    argued that the court should instruct the jury that it could draw an adverse inference from
    the loss of the cell phone. But the court observed that the jury had not been presented with
    any evidence of the Government’s failure to preserve the cell phone and that “the
    explanation as to why it doesn’t exist now would be highly prejudicial to” Johnson. Id. at
    1244-45.
    The district court ultimately resolved not to give an adverse inference instruction,
    broadly citing “what I’ve heard at trial and what we’ve discussed at the [June 18, 2018]
    hearing.” See J.A. 1246-47. The court did accord the defendants an instruction regarding
    “weaker or less satisfactory evidence,” based on the Government’s failure to analyze
    25
    (rather than to preserve) Medrano’s cell phone. See id. at 1247-48. That instruction stated:
    “If a party offers weaker or less satisfactory evidence when stronger and more satisfactory
    evidence could have been produced at trial, you may, but are not required to, consider this
    fact in your deliberations.” Id. at 1385. The jury thereafter found the defendants guilty of
    the Death Count, having discerned no reasonable doubt that the defendants sold heroin to
    Medrano and that the defendants’ heroin was a but-for cause of Medrano’s death.
    C.
    Reiterating the arguments they made in the district court in seeking dismissal of the
    Death Count, Johnson and Stewart now urge this Court to rule that the Government
    contravened their due process rights and deprived them of a fair trial by failing to disclose
    and preserve Medrano’s cell phone. Alternatively, the defendants would have us rule that
    the district court erred in refusing to give the jury an adverse inference instruction
    concerning the Government’s loss of the cell phone.
    1.
    In support of their due process claim, Johnson and Stewart invoke Brady and
    contend that the Government “suppressed [Medrano’s] cell phone, either willfully or
    inadvertently.” See Br. of Appellants 16-17 (citing Brady, 
    373 U.S. at 87
    ). The defendants
    also argue that the Government violated its obligation under Agurs to disclose the cell
    phone — as material exculpatory evidence — even in the absence of the defendants’
    request for it. See id. at 18 (emphasizing that the Government has “a duty to disclose
    evidence ‘obviously of such substantial value to the defense that elementary fairness
    requires it to be disclosed even without a specific request’” (quoting Agurs, 
    427 U.S. at
    26
    110)). In the defendants’ words, Agurs “protects against” what seemingly occurred here:
    “police and prosecutors hiding exonerating evidence.” See 
    id.
     Regardless of whether the
    suppression of the cell phone was intentional, however, the defendants insist they are
    entitled to relief. See Holdren v. Legursky, 
    16 F.3d 57
    , 60 (4th Cir. 1994) (explaining that
    under Brady and Agurs, “the government has a duty to disclose material exculpatory
    evidence to the defendant, and the good faith or bad faith of the government in failing to
    do so is irrelevant”).
    Johnson and Stewart further contend in support of their due process claim that the
    Government unconstitutionally failed to preserve Medrano’s cell phone. The defendants
    argue for relief pursuant to both Trombetta, 
    467 U.S. at 489
     (requiring that lost evidence
    have apparent exculpatory value and that comparable evidence be unavailable), and
    Youngblood, 488 U.S. at 58 (allowing lost evidence to be just potentially useful but only
    with showing of Government’s bad faith). Under Trombetta, the defendants maintain that
    the cell phone’s exculpatory “value was apparent from the start of [the] investigation” into
    Medrano’s death and that the cell phone “was of such a nature that it can never be
    duplicated.” See Br. of Appellants 23. With respect to Youngblood, the defendants assert
    that — “even if this Court somehow finds that [the cell] phone only possessed potentially
    material exculpatory evidence” — “this case would still call for a finding of a due process
    violation because the failure to preserve [the cell phone] was caused by bad faith actions.”
    Id.
    On the bad faith issue, Johnson and Stewart complain that the district court did not
    allow them to examine Investigator Bean and other witnesses during the June 18, 2018
    27
    hearing before finding no bad faith conduct by the Government and rejecting the
    defendants’ due process claim under Youngblood. Nevertheless, the defendants contend
    that we can award them relief in these appeals based on existing evidence of bad faith,
    including Bean’s June 20, 2018 trial testimony admitting that he knew Medrano’s cell
    phone contained evidence of recent drug activity yet he neither analyzed the cell phone nor
    documented that the Government possessed it.
    As we see it, however, the evidentiary record is too meager to render a proper ruling
    on Johnson and Stewart’s due process claim. And the deficiency of the record is not limited
    to the Youngblood bad faith issue; it also inhibits the application of Brady, Agurs,
    Trombetta, and the potentially-useful-evidence standard of Youngblood. Consequently, we
    must conclude that the district court erred by rejecting the defendants’ claim in reliance on
    an incomplete record — a record that was even more inadequate at the time of the district
    court’s ruling than it is now that it includes the trial evidence.
    Simply put, much remains unknown regarding the circumstances of the
    Government’s failure to disclose and preserve Medrano’s cell phone. For example, even
    if Investigator Bean did not review the contents of the cell phone, did Deputy Whitehead
    or another police officer or a prosecutor or witness do so? What did Medrano’s family see
    on the cell phone when they looked through its photographs? What is Bean’s sworn
    explanation for returning the cell phone to Medrano’s family? Did Bean actually believe
    the case was over because Johnson had entered a guilty plea to the Distribution Count?
    Did Bean consider that Johnson’s plea agreement had not been accepted by the district
    court and that the Death Count remained pending? Did Bean consider Stewart and the
    28
    pendency of the Death Count as to her? Did it concern Bean that there had not been any
    convictions, sentencings, or appeals in the case? Did Bean consult the prosecutors or other
    police officers before returning the cell phone to Medrano’s family? Did Bean dispose of
    additional Death Count evidence or only the cell phone?
    These are important questions that need to be answered in order for a fair and
    appropriate analysis of Johnson and Stewart’s due process claim to be conducted. Thus,
    we cannot ratify the district court’s approach of disallowing witnesses and then relying on
    the limited evidentiary record to reject the defendants’ claim.
    Indeed, we also have doubts about the merits of the district court’s decision.
    Specifically, we are troubled by the court’s narrow focus on Youngblood and the court’s
    ruling that Investigator Bean acted neither in bad faith nor even negligently in returning
    Medrano’s cell phone because he “held on to it until after [Johnson’s] change of plea
    hearing.” See J.A. 213-14. It confounds us how the court could accept it as reasonable for
    Bean to believe the case was over upon Johnson’s guilty plea to the Distribution Count,
    but unreasonable for Johnson not to request the cell phone as evidence on the Death Count
    prior to the court’s rejection of his plea agreement. We are also troubled by the court’s
    pronouncement that there was only “potentially useful evidence on that phone,” id. at 213,
    as the Government conceded that the cell phone had at least some content with apparent
    exculpatory value, i.e., the “laced blunt” text indicating that Medrano smoked a laced blunt
    in addition to snorting the defendants’ alleged heroin shortly before his death.
    In any event, the district court will have the opportunity to reassess Johnson and
    Stewart’s due process claim with the expansion of the evidentiary record on remand. We
    29
    fully expect that the additional evidence — including evidence elucidating Investigator
    Bean’s decision to return Medrano’s cell phone and delineating the cell phone’s known
    and suspected contents — will enable a thorough analysis of the due process claim that
    includes a careful application of the principles of Brady, Agurs, Trombetta, and
    Youngblood. Such an analysis is plainly merited, as the defendants have stated a plausible
    claim that the Government’s failure to disclose and preserve the cell phone has impeded
    their ability to defend themselves on the Death Count by showing that drugs other than the
    defendants’ alleged heroin may have caused Medrano’s death. Although the defendants
    would be entitled to due process with respect to any criminal charge, it bears repeating that
    the Death Count carries a mandatory sentence of 20 years to life. 7
    2.
    Because we conclude that the district court erred by relying on an incomplete
    evidentiary record to reject Johnson and Stewart’s due process claim, we need not decide
    whether the court committed further error with respect to the Death Count by refusing to
    instruct the jury that it could draw an adverse inference from the Government’s loss of
    7
    We also emphasize that our identification of questions that need to be answered is
    not meant to circumscribe in any way the district court’s expansion of the evidentiary
    record. For example, further lines of inquiry may emerge as evidence is developed on the
    contents of Medrano’s cell phone, Investigator Bean’s return of the cell phone to
    Medrano’s family, and the involvement of any prosecutors or other police officers with the
    Government’s possession and disposal of the cell phone. Additional questions have arisen
    in these proceedings regarding whether the cell phone may have contained impeachment
    evidence and whether Medrano’s family gave the police investigators a second cell phone.
    It is also possible that the family has now found and can produce the cell phone (or cell
    phones).
    30
    Medrano’s cell phone. We observe, however, that if on remand the court rejects the
    defendants’ due process claim again and conducts a retrial, the court should assess anew
    whether the defendants are entitled to an adverse inference instruction.
    As explained in our Vodusek decision, an adverse inference instruction may be
    appropriate under the evidentiary rule relating to spoliation of evidence. See 
    71 F.3d at 155
    . That is, “an adverse inference may be drawn against a party who [loses or] destroys
    relevant evidence” where there is “a showing that the party knew the evidence was relevant
    to some issue at trial and that his willful conduct resulted in its loss or destruction.” 
    Id. at 155-56
    .   In light of the “willful conduct” requirement, the mere “negligent loss or
    destruction of evidence” is an insufficient basis for an adverse inference. 
    Id. at 156
    .
    Meanwhile, “a finding of bad faith suffices to permit such an inference” but “is not always
    necessary.” 
    Id.
     At bottom, there simply needs to be a showing that the party’s “intentional
    conduct contribute[d] to the loss or destruction of [the] evidence.” See id.; see also Buckley
    v. Mukasey, 
    538 F.3d 306
    , 323 (4th Cir. 2008) (explaining that the spoliation of evidence,
    “though not conducted in bad faith, could yet be intentional, willful, or deliberate” and
    therefore support an adverse inference instruction (internal quotation marks omitted)).
    Notably, the decision to give an adverse inference instruction is “at the discretion of
    the trial court.” See Vodusek, 
    71 F.3d at 155
    . Nevertheless, the court abuses its discretion
    in disallowing an adverse inference instruction where the instruction is “correct,” is “not
    substantially covered by the charge” given to the jury, and “involve[s] some point so
    important that the failure to give the instruction seriously impair[s] the defendant’s
    defense.” See United States v. Bartko, 
    728 F.3d 327
    , 343 (4th Cir. 2013).
    31
    Here, during the June 2018 trial, the district court denied Johnson and Stewart’s
    request for an adverse inference instruction after observing that the jury had not been
    presented with any evidence of the loss of Medrano’s cell phone and that the Government’s
    explanation for that loss (that Investigator Bean returned the cell phone to Medrano’s
    family following Johnson’s guilty plea) would be “highly prejudicial” to Johnson. See J.A.
    1244-45. The court also suggested that the instruction was inappropriate for other reasons,
    in that it broadly cited “what I’ve heard at trial and what we’ve discussed at the [June 18,
    2018] hearing.” See 
    id. at 1246-47
    . As an alternative to the proposed adverse inference
    instruction, the court gave an instruction regarding “weaker or less satisfactory evidence,”
    based on the Government failure to analyze the cell phone. See 
    id. at 1247-48
    .
    Upon any retrial on remand, the district court should entertain ways to inform the
    jury of the Government’s loss of Medrano’s cell phone without revealing Johnson’s guilty
    plea so that an adverse inference instruction may be given. The court should also consider
    that the existing record reflects the following: that Investigator Bean has admitted knowing
    early in the investigation that the cell phone contained evidence relevant to the issue of
    whether Medrano’s death resulted from the use of Johnson and Stewart’s alleged heroin or
    other drugs from other sources; that despite his knowledge of the cell phone’s evidentiary
    value, Bean intentionally returned the cell phone to Medrano’s family after opting not to
    analyze it; and that the family then misplaced the cell phone, preventing the defendants
    from presenting the cell phone’s lost contents to establish a reasonable doubt that their
    alleged heroin was a but-for cause of Medrano’s death. Finally, to the extent that the court
    may be inclined to again charge the jury as it did during the June 2018 trial, the court should
    32
    consider whether an instruction on weaker or less satisfactory evidence — being based on
    the Government’s failure to analyze the cell phone, with no explanation to the jury that the
    cell phone is now lost and cannot be analyzed by the defendants or anyone else — is truly
    an adequate substitute for an adverse inference instruction.
    III.
    We next address Johnson’s appellate contention with respect to Custer, the alleged
    heroin recipient in the Distribution Count. Johnson argues that the district court erred in
    allowing the Government to present trial evidence that Custer, like Medrano, died soon
    after using heroin provided by Johnson.
    A.
    1.
    Under the Government’s theory of the Distribution Count, Johnson provided heroin
    to Custer during a chance encounter at Vixens Gentleman’s Club in Berkeley County on
    the night of May 28, 2016 — two nights before Johnson and Stewart’s alleged sale of
    heroin to Medrano. According to the Government, Custer was seen snorting a substance
    given to him by Johnson in the Vixens outdoor smoking area, soon developed symptoms
    of heroin intoxication, and died in the early morning hours of May 29. Because the state
    autopsy report attributed Custer’s death to the combined effects of heroin, oxycodone, and
    alcohol, the Government charged Johnson with simple distribution of heroin to Custer,
    without the enhancement element for causing death or serious bodily injury.
    33
    In April 2018, prior to the trial, the Government filed a motion in limine seeking to
    introduce evidence of Custer’s “use of the substance provided by Johnson and his death
    early the following morning.” See United States v. Johnson, No. 3:17-cr-00007, at 1 (N.D.
    W. Va. Apr. 3, 2018), ECF No. 136. The motion acknowledged that the Distribution Count
    “does not allege that death resulted from the use of [Johnson’s] heroin.” 
    Id.
     The motion
    explained, however, that because “law enforcement did not recover any heroin,” the
    Government needed to rely on circumstantial evidence that it was heroin that Johnson
    provided to Custer. 
    Id. at 3
    . That circumstantial evidence included “testimony about how
    [Custer’s] body reacted after using the substance” and “testimony about the toxicology
    results and cause of death.” 
    Id. at 3-4
    . 8
    The district court took up the Government’s motion in limine during the hearing on
    June 18, 2018, the day before the trial began. Johnson immediately agreed to stipulate to
    Custer’s toxicology report and not to contest other evidence of Custer’s physical state, so
    long as there was no “mention of death and that heroin was any part of that.” See J.A. 216-
    17; see also 
    id. at 223-24
     (elaborating that Johnson would agree to evidence that blood and
    urine samples were collected from Custer “when he was taken to the hospital” but not “that
    it was done as part of an autopsy”).
    In response, the Government emphasized that it could not “prove that Mr. Custer
    died as a result of heroin intoxication” and that it did not “intend to imply that he died as a
    8
    In the alternative, the Government asserted in its motion in limine that the evidence
    of Custer’s death was admissible under United States v. Kennedy, 
    32 F.3d 876
    , 886 (4th
    Cir. 1994), to provide context to the Distribution Count and “complete the story.”
    34
    result of heroin intoxication.” See J.A. 223. Nevertheless, the Government insisted that it
    yet needed to present evidence of Custer’s death to explain to the jury why Custer was not
    testifying at the trial. The Government asserted that Custer’s unexplained absence could
    “look[] bad for the Government” and lead the jury to speculate that Custer was “not
    comfortable with what’s going on in [the] courtroom” and that the Government was “trying
    to hide something” and had “messed something up.” Id. at 229. The Government
    expressed a preference for the admission of evidence that Custer died shortly after using
    heroin provided by Johnson, while proposing in the alternative that the jury be informed
    that Custer was “unavailable because he’s deceased” without “disclos[ing] when he died.”
    Id.
    After hearing the parties’ arguments, the district court ruled that the Government
    could present evidence along the lines agreed to by Johnson — that is, evidence of Custer’s
    toxicology report and physical state after using Johnson’s alleged heroin — but not
    evidence of Custer’s contemporaneous death. The court specified that because “the
    Government can’t prove and thus it didn’t charge that Mr. Custer died as a result of the
    heroin he ingested that was allegedly distributed to him by Mr. Johnson,” the court was
    “not going to permit the mention of the death of Mr. Custer in that context.” See J.A. 232-
    33. Recognizing “the problem for the Government in not presenting a witness in a charge
    this significant,” however, the court further ruled that the Government would be allowed
    “to mention one time to the jury that Mr. Custer [was] unavailable because he’s deceased.”
    Id. at 233.
    35
    The district court also addressed the potential prejudice to Johnson of admitting
    evidence of Custer’s death. On the one hand, the court reasoned that Johnson would not
    be prejudiced by a single mention of Custer’s death meant to explain Custer’s absence from
    the trial, as the jury was “going to understand that Mr. Custer was an addict” and thus
    would not “think anything of the fact that Mr. Custer is deceased.” See J.A. 233. On the
    other hand, the court cautioned that “we need to make sure . . . that the Government and
    the defendant instruct all their witnesses that there won’t be any mention that Mr. Custer’s
    death was in any way related to [the Distribution Count].” Id.
    2.
    On the first day of the June 2018 trial, the first prosecution witness on the
    Distribution Count — a friend of Custer’s brother — testified to driving in a truck to Vixens
    for a celebration on the night of May 28, 2016, with a group of men that also included
    Custer, Custer’s brother, their cousin, and Custer’s best friend. The brother’s friend
    described intermittently encountering Johnson in the Vixens outdoor smoking area,
    including times when Custer was also present. Although the brother’s friend did not claim
    to witness the transaction alleged in the Distribution Count, he did testify that Custer’s
    “demeanor started to change” “a couple hours into the night.” See J.A. 513. Specifically,
    Custer “started dropping his head a lot like he was falling asleep, passing out type of thing.
    Slurring his words a lot. Saying that he just wanted to go to the truck and sleep.” Id.
    According to the brother’s friend, who had been trained to identify the effects of controlled
    substances in his work as a correctional officer, it “appeared that [Custer] was on some sort
    of downer drug.” Id. at 514.
    36
    Custer’s brother’s friend testified that he and two other group members eventually
    escorted Custer as he walked to the group’s truck in the Vixens parking lot to sleep.
    Because Custer said that “[h]e didn’t want [his companions] to end the night on account of
    him,” the men left Custer in the parking lot, reentered Vixens, and stayed for several more
    hours, until “close to” the club’s 3:00 a.m. closing time. See J.A. 516. The brother’s friend
    indicated that when he and the other group members then returned to the truck, they
    discovered that Custer needed medical attention and called for an ambulance that took
    Custer from the scene.
    On cross-examination, the defense elicited from Custer’s brother’s friend that there
    are a variety of “downer” drugs — including, but not limited to, heroin, oxycodone, and
    alcohol — that could have caused Custer’s symptoms. See J.A. 546-47. The defense also
    confirmed that the brother’s friend did not “see Mr. Custer using drugs,” “see any
    distribution occur,” or “know anything about the drugs Mr. Custer had,” such as “what type
    of drugs,” “what color the drugs were,” “how many drugs,” or “how the drugs were
    packaged.” Id. at 547. Thereafter, the defense specifically elicited that the brother’s friend
    did not know whether Custer “used” or “was given any drugs at Vixens.” Id. The defense
    then turned to the hours that Custer spent in the Vixens parking lot, with the following line
    of questioning:
    Q.     You don’t know what he was doing out in that parking lot?
    A.     I do not.
    Q.     You don’t know who he might have spoken to out in that parking lot?
    A.     I do not.
    37
    Q.     You don’t know if he got any drugs from anyone out in that parking
    lot?
    A.     Correct.
    Id. at 548.
    At that point in the cross-examination, the Government requested a bench
    conference and argued that the foregoing line of questioning had “opened the door on the
    death of Mr. Custer.” See J.A. 549. The prosecutor asserted that she knew from a pretrial
    conversation with Custer’s brother’s friend that he believed Custer had died by the time he
    was found in the truck around Vixens’ closing time. See id. (“When this particular witness
    went out to the parking lot, [Custer’s] lips were purple. He was ashen gray. And based on
    [the witness’s] training and experience . . . , he believes [Custer] was deceased at that point
    in time.”). The prosecutor also stated that evidence that Custer died in the parking lot had
    been available to the defense. From there, the prosecutor contended that — by implying
    that Custer had been “out there walking around finding drugs” while his companions were
    inside Vixens — the defense opened the door to the evidence that Custer had actually spent
    that time going from “[s]ick to dead.” Id. at 551.
    The defense countered that it simply “opened the door that [Custer] was out there
    for a number of hours without any supervision, without any witnesses seeing him.” See
    J.A. 551. The district court, however, agreed with the Government that the defense had
    opened the door to evidence that Custer died that morning in the Vixens parking lot. The
    court briefly explained: “But [the defense] did imply and I so find that [Custer] was out
    there doing something else or could have been doing something else. I find the door has
    38
    been opened, and the Government can proceed.” Id. The court then withdrew its previous
    day’s ruling allowing just one mention of Custer’s death and permitted the Government to
    inform its witnesses that they were now free to discuss the death in their testimony.
    3.
    Following the bench conference, the Government focused its redirect examination
    of Custer’s brother’s friend on seeing Custer in the Vixens parking lot in the early morning
    hours of May 29, 2016. The brother’s friend testified that Custer “was unconscious. He
    wasn’t breathing. His lips were blue. Pale skin.” See J.A. 554. The brother’s friend also
    stated that “CPR was being administered” to Custer in the parking lot, first by Custer’s
    cousin and then by an “off-duty EMS person,” until “the ambulance showed up.” Id. The
    brother’s friend described Custer as having “asphyxiated on himself,” id., but did not
    explicitly state an opinion that Custer was dead in the parking lot.
    Subsequent witnesses confirmed that Custer died that morning without pinpointing
    a time or place of death. Custer’s cousin testified that he and Custer’s brother had
    periodically checked on Custer during the hours after he went to the Vixens parking lot to
    sleep in the truck and before the club’s closing time. On direct examination by the
    Government, the cousin stated that he did not see Custer “talking to anyone else” or
    “obtaining substances from anyone” during those checks. See J.A. 783. In the cousin’s
    words, that was because when he checked on Custer in the parking lot, Custer “was
    sleeping or he was dead. One or the other.” Id. Meanwhile, Custer’s best friend testified
    to learning only after Custer reached the hospital that he was dead. See id. at 721 (“The
    doctor came in and told us that he didn’t make it. He died.”).
    39
    In addition to the evidence of Custer’s death, the Government presented the
    testimony of Custer’s best friend that on the night of May 28, 2016, he saw Johnson hand
    Custer a gum wrapper and Custer snort the gum wrapper’s contents while Johnson and
    Custer were interacting in the Vixens outdoor smoking area. The best friend did not see
    what was inside the gum wrapper but noticed a short time later that Custer began nodding
    off and having trouble maintaining a conversation and holding his cigarette (signs of
    possible heroin intoxication). A dancer at Vixens testified for the Government that she saw
    Johnson that night with a plastic bag containing a powdery substance and he offered her
    “rock” and “dog food” (like “boy,” slang terms for heroin). Other prosecution witnesses
    noted Custer’s symptoms of heroin intoxication, which also included vomiting. And video
    recordings from some of Vixens’ surveillance cameras showed Johnson and Custer
    interacting, albeit without clearly documenting the heroin transaction alleged in the
    Distribution Count.
    The defense responded to the Government’s case by not only questioning Custer’s
    best friend’s testimony that Johnson provided some substance to Custer, but also by
    contesting that any substance provided by Johnson was undoubtedly heroin. In that regard,
    the defense highlighted evidence that Custer’s symptoms after allegedly snorting Johnson’s
    substance were not exclusive to heroin intoxication; that Custer’s toxicology report was
    positive for more drugs than heroin; that Custer may have used heroin before going to
    Vixens, brought it with him, or obtained it there from a source other than Johnson; that
    heroin and other drugs were regularly sold and used at Vixens; that several of the
    prosecution witnesses, including some of Custer’s companions, used heroin and other
    40
    drugs; and that Custer was not constantly monitored by his companions or the Vixens
    surveillance cameras.
    Thereafter, in its closing argument, the Government emphasized similarities
    between Medrano and Custer, including that “both of them within the span of two days had
    chance encounters with Kelvin Johnson” and that “[b]oth of them had heroin in their
    system.” See J.A. 1299. The Government also urged the jury to rely on the Death Count
    evidence to find Johnson guilty of the Distribution Count for providing heroin to Custer,
    and to rely on the Distribution Count evidence to find Johnson and Stewart guilty of the
    Death Count for selling heroin to and thereby causing the death of Medrano. As the
    Government explained to the jury, “you’ve seen evidence about the distribution [to Custer]
    on May 28th, and you’ve seen evidence about the distribution [to Medrano] on May 30th.
    But you don’t need to compartmentalize it that way.” Id. at 1303. The jury then returned
    a verdict against Johnson on the Distribution Count, along with its verdict against Johnson
    and Stewart on the Death Count.
    B.
    We review for abuse of discretion the district court’s admission of the evidence of
    Custer’s death. See United States v. Alvarado, 
    840 F.3d 184
    , 188 (4th Cir. 2016) (“This
    court reviews a district court’s evidentiary rulings for abuse of discretion.”). The district
    court abused its discretion if it rested its ruling — that the defense opened the door to
    evidence that Custer died on the morning of May 29, 2016, in the Vixens parking lot —
    “on erroneous factual or legal premises.” See 
    id. at 189
     (internal quotation marks omitted).
    Even if the evidence was admitted in error, we will not vacate Johnson’s conviction of the
    41
    Distribution Count if the error was harmless. See Fed. R. Crim. P. 52(a) (“Any error . . .
    that does not affect substantial rights must be disregarded.”). In order to deem the district
    court’s “evidentiary ruling to be harmless, we must find that the judgment was not
    substantially swayed by the error.” See United States v. Johnson, 
    617 F.3d 286
    , 295 (4th
    Cir. 2010).
    On appeal, Johnson argues that the defense did not open the door to “unfettered
    evidence” of Custer’s death and that the district court thus abused its discretion in allowing
    such irrelevant evidence. See Br. of Appellants 29-30. Johnson further contends that the
    error was not harmless, in that “little is more prejudicial than allowing the inference that
    Johnson is also somehow guilty of the uncharged death of Custer, while on trial for
    distributing heroin to Custer.” 
    Id.
     at 30 (citing United States v. Wilson, 
    135 F.3d 291
    , 299
    (4th Cir. 1998), for the proposition that “it is hard to fathom anything more prejudicial than
    the unproved assertion that the accused is also guilty of the uncharged crime of murder
    while he is on trial for another offense”). According to Johnson, there is a high probability
    that the jury convicted him of the Distribution Count “not because it weighed the evidence
    for proof of distribution of heroin, but because it believed that [his] actions somehow
    contributed to Custer’s death.” 
    Id.
    For its part, the Government asserts on appeal — as it successfully did at trial —
    that the defense opened the door to the evidence of Custer’s death by suggesting in its
    cross-examination of the first Distribution Count witness (Custer’s brother’s friend) that
    Custer may have obtained drugs in the Vixens parking lot after being left there by his
    companions. The Government maintains that the defense thereby misled the jury, in that
    42
    the defense falsely implied that “Custer was physically able to seek out drugs while in the
    parking lot” and “could have been doing something other than dying.” See Br. of Appellee
    35. Accordingly, the Government insists that the district court properly admitted the
    evidence of Custer’s death for the purpose of “correcting the [defense’s] deception.” See
    
    id.
     at 33 (citing United States v. McLaurin, 
    764 F.3d 372
    , 383 (4th Cir. 2014), for the
    proposition that “[a] district court may allow testimony on redirect which clarifies an issue
    which the defense opened up on cross-examination even when this evidence is otherwise
    inadmissible” (internal quotation marks omitted)).
    Notably, the Government does not contend that the evidence of Custer’s death was
    admissible for any other reason, including any reason it advanced prior to the trial, when
    the district court initially excluded the evidence (except for a single mention of Custer’s
    death) as irrelevant and unduly prejudicial. Moreover, the Government does not argue that
    if the evidence was admitted in error, the error was harmless.
    Upon careful review of the record, we conclude that the district court erred in freely
    admitting evidence of Custer’s death, i.e., in ruling that the defense opened the door to
    evidence that Custer died on the morning of May 29, 2016, in the Vixens parking lot. That
    is so because the court’s ruling rested on unsubstantiated premises: that Custer’s death
    occurred in the parking lot and that his death precluded any possibility that he obtained
    drugs in the parking lot during the hours that he was left there unattended.
    First of all, although the prosecutor proffered to the district court that Custer’s
    brother’s friend believed Custer died in the parking lot — and although the prosecutor
    indicated that she needed to present such evidence to the jury to correct any misperception
    43
    that Custer had been physically capable of finding drugs there — the Government made no
    apparent effort to elicit that opinion from the brother’s friend in his subsequent testimony.
    The Government thereafter prompted other witnesses to testify that Custer died on the
    morning of May 29, 2016, but did not ask the witnesses to pinpoint a time or place of
    Custer’s death.
    More importantly, the Government presented no evidence that Custer’s death —
    whether it occurred in the parking lot or later in the ambulance or at the hospital — rendered
    it an impossibility that Custer could have obtained drugs in the parking lot in the hours
    after some of his companions escorted him to the truck and left him alone there. That is,
    contrary to the Government’s assertions to the district court and this Court, there is no proof
    that it is impossible that Custer “could have been doing something other than dying.” See
    Br. of Appellee 35. At most, the Government demonstrated at trial that Custer’s death
    made it unlikely that Custer was physically capable of finding drugs in the parking lot. But
    the Government did not need the evidence of Custer’s death to make that showing, as it
    could have made the same showing with the evidence that Custer was eventually found
    unconscious and taken to the hospital by ambulance. And in any event, there was no false
    implication or deception for the evidence of Custer’s death to correct.
    In addition to concluding that the district court therefore erred in ruling that the
    defense opened the door to the evidence of Custer’s death, we conclude that the court’s
    error was not harmless. The court itself initially recognized that the evidence of Custer’s
    death was not only irrelevant, but also unduly prejudicial. As Johnson argues, there is a
    significant likelihood that — rather than carefully weighing the evidence of heroin
    44
    distribution — the jury was inflamed to convict him of the Distribution Count to punish
    him for somehow contributing to Custer’s death. Cf. Wilson, 
    135 F.3d at 300
     (“Here, there
    is a serious risk that the jury decided to convict [the defendant] simply because it believed
    he was a murderer, not because it weighed the evidence for proof of drug conspiracy and
    possession, the crimes actually charged.”). 9
    Our concern about the prejudicial impact of the evidence of Custer’s death extends
    to the Death Count. As reflected herein, the Government lacked strong and undisputed
    evidence that the substance allegedly distributed in the Death and Distribution Counts was
    heroin. Consequently, the Government urged the jury to return guilty verdicts on those
    charges based on similarities between Medrano and Custer. To be sure, the evidence that
    both Medrano and Custer died is a similarity that may have caused the jury to overlook
    weaknesses in the evidence and to convict Johnson and Stewart of the Death Count and
    Johnson of the Distribution Count. We thus cannot say that the jury’s verdicts were not
    substantially swayed by the erroneous admission of the evidence of Custer’s death.
    9
    The district court might have ameliorated the prejudice associated with the
    evidence of Custer’s death by giving the jury a limiting instruction. While courts normally
    have no obligation to provide such an instruction absent a request by the parties, see United
    States v. Johnson, 
    945 F.3d 174
    , 178 (4th Cir. 2019), cert. denied, 
    141 S. Ct. 255
     (2020),
    they may nonetheless do so sua sponte, see United States v. Hager, 
    721 F.3d 167
    , 203 (4th
    Cir. 2013). And we have long held that “‘cautionary or limiting instructions generally
    obviate’ prejudice” that certain evidence may generate. See United States v. Cowden, 
    882 F.3d 464
    , 473 (4th Cir. 2018) (quoting United States v. Powers, 
    59 F.3d 1460
    , 1468 (4th
    Cir. 1995)). Our review of the record, however, indicates that neither side requested a
    limiting instruction. Nor did the district court give one — either when it admitted the
    evidence of Custer’s death or in its final jury instructions.
    45
    IV.
    Pursuant to the foregoing, we vacate the convictions and sentences of Johnson and
    Stewart on the Death Count and the conviction and sentence of Johnson on the Distribution
    Count. We remand for such other and further proceedings as may be appropriate.
    VACATED AND REMANDED
    46