United States v. Zachary Fuchs ( 2022 )


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  •                         NOT RECOMMENDED FOR PUBLICATION
    File Name: 22a0041n.06
    No. 21-5482
    UNITED STATES COURT OF APPEALS
    FOR THE SIXTH CIRCUIT
    FILED
    )                             Jan 24, 2022
    UNITED STATES OF AMERICA,                                                 DEBORAH S. HUNT, Clerk
    )
    Plaintiff-Appellee,                      )
    )
    v.                                                         ON APPEAL FROM THE UNITED
    )
    STATES DISTRICT COURT FOR
    )
    ZACHARY FUCHS,                                             THE WESTERN DISTRICT OF
    )
    TENNESSEE
    Defendant-Appellant.                     )
    )
    Before: COLE, LARSEN, and MURPHY, Circuit Judges.
    LARSEN, Circuit Judge. A jury convicted Zachary Fuchs of possessing with the intent to
    distribute more than 50 grams of methamphetamine, in violation of 
    21 U.S.C. § 841
    . Fuchs
    appeals his conviction, arguing that the district court should have suppressed the drugs, excluded
    evidence of his prior narcotics offense, and declared a mistrial based on a witness’s improper
    remarks. We reject each challenge and AFFIRM.
    I.
    A.
    While on traffic patrol, Gallaway Police Department (GPD) Officer David Nabors pulled
    Fuchs over for driving without a license plate. Fuchs stopped in the parking lot of a nearby
    business, partially blocking its driveway. Nabors approached Fuchs, who, according to Nabors,
    was “immediately combative” and accused Nabors of lying about the missing license plate.
    No. 21-5482, United States v. Fuchs
    Nabors asked for Fuchs’s license and registration, but Fuchs had neither. Nabors later testified
    that he smelled marijuana upon his initial contact with Fuchs.
    Armed only with Fuchs’s name, date of birth, and social security number, Nabors returned
    to his vehicle to run Fuchs’s information. Nabors realized at that time that he had accidentally
    activated the light on his body camera, rather than the camera itself; Nabors fixed his mistake, and
    the record includes video footage of the events from this point forward. The dispatcher reported
    that Fuchs had a prior felony conviction for manufacturing methamphetamine, had once stolen a
    vehicle while fleeing arrest, and allegedly carries a handgun. Nabors testified that, while he was
    talking to dispatch, he saw Fuchs moving around in his vehicle. GPD Captain James Mayes soon
    arrived and approached the driver’s door of Fuchs’s vehicle. Knowing that Mayes was not privy
    to Fuchs’s alleged handgun possession and based on Fuchs’s prior movements, Nabors decided to
    cut the dispatch call short and detain Fuchs.
    Nabors asked Fuchs to step out of the vehicle, then frisked and handcuffed him. Nabors
    questioned Fuchs about the vehicle; Fuchs said it belonged to his girlfriend’s ex-boyfriend, but he
    could not be sure it was not stolen. Meanwhile Mayes looked in the door jamb and under the hood
    of Fuchs’s car, trying to find a vehicle identification number (VIN) to confirm Fuchs’s story.
    Nabors then asked whether there was anything illegal in the car, and Fuchs responded, “there might
    be a blunt, a little half joint or something.” After the questioning, Mayes walked Fuchs back to
    his squad car.
    Noticing that they were blocking a semi-truck that was trying to exit the parking lot, Mayes
    asked Nabors to move both Fuchs’s and Nabors’s vehicles. Nabors did so, and, after moving
    Fuchs’s car, rolled up the driver’s window “[t]o keep the odor inside” and “make it easier on [his
    -2-
    No. 21-5482, United States v. Fuchs
    drug] dog to go to the source of the odor.” Nabors then retrieved his narcotics canine, Kilo, from
    his vehicle. Kilo alerted at the driver’s door and the back hatch of Fuchs’s car.
    Based on Kilo’s alerts, Nabors and Mayes searched Fuchs’s car. Under the driver’s seat,
    next to Fuchs’s shoes, Nabors found a plastic bag containing what appeared to be
    methamphetamine residue. He then found a bag containing about a pound of methamphetamine
    behind a removable compartment below the radio.
    B.
    After a grand jury indicted Fuchs on one count of possessing methamphetamine with the
    intent to distribute, see 
    21 U.S.C. § 841
    (a)(1), he moved to suppress the drugs and all statements
    he made after being handcuffed. Relevant here, Fuchs argued that Nabors lacked reasonable
    suspicion to initiate a traffic stop, exceeded the scope of the stop by handcuffing him, unreasonably
    searched Fuchs’s vehicle when he moved it, and relied on Kilo’s unreliable alert to search the car.
    The government disagreed and added that, in any event, the narcotics inevitably would have been
    found during an inventory search of the car after it was towed.
    A magistrate judge held an evidentiary hearing on the motion. Nabors, the only witness,
    testified to the events described above. Fuchs’s attorney cross-examined Nabors on several points,
    but two are particularly relevant here: First, he asked about Nabors’s claim to have smelled
    marijuana, pointing out that Nabors failed to include anything about the odor in his arrest affidavit
    and didn’t question Fuchs about it at the time. Nabors responded that he listed only Kilo’s alert
    on the affidavit because that was “why [he] went in the car,” but he admitted that “the marijuana
    smell would have been a probable cause as well.” Counsel also asked about why Mayes looked
    under the hood of Fuchs’s car. Nabors explained that the officers were trying to determine whether
    -3-
    No. 21-5482, United States v. Fuchs
    the car was stolen, and that Mayes later told him that he had to look under the hood for the VIN
    because the number on the door “had been painted over.”
    The magistrate judge recommended denying the suppression motion as to the drugs but
    granting it as to Fuchs’s statements. She credited Nabors’s testimony about Fuchs’s demeanor and
    furtive movements, which, when combined with the report that he might have been armed, justified
    detaining Fuchs in handcuffs. She also found credible Nabors’s testimony about the marijuana
    smell, which gave him probable cause to search Fuchs’s vehicle. Finally, she credited Nabors’s
    description of Kilo’s search procedure and found that Kilo did in fact alert on Fuchs’s vehicle.
    The magistrate concluded, however, that the statements Fuchs made while handcuffed were
    obtained in violation of Miranda v. Arizona, 
    384 U.S. 436
     (1966), and therefore should be
    suppressed.
    Shortly after the magistrate judge issued her report and recommendation, Fuchs moved to
    re-open the evidentiary record underlying the suppression motion. He claimed to have discovered
    new evidence calling Nabors’s credibility into question. The district court granted the motion and
    scheduled a new hearing.
    C.
    At the second suppression hearing, the government again called Nabors. While his
    testimony largely matched that from the first hearing, a few differences stand out. First, the
    marijuana odor: Although Nabors again said that he detected an odor of marijuana on his initial
    encounter with Fuchs, he also stated that he “wasn’t thinking at all about narcotics” after
    questioning Fuchs outside the vehicle because he “wouldn’t think anybody would be traveling
    with narcotics in their vehicle without a tag on it.” On cross-examination, Nabors conceded that
    he didn’t ask Fuchs about the alleged marijuana smell, explaining that he “was waiting on another
    -4-
    No. 21-5482, United States v. Fuchs
    officer to get there”; Nabors said he didn’t tell Mayes about the marijuana either because, by the
    time Mayes arrived, “officer safety was [his] biggest concern.” Fuchs’s attorney again confronted
    Nabors about his failure to mention the marijuana smell in the arrest ticket, despite his having been
    trained to include such information. And for the first time, Fuchs introduced a transcript of
    Nabors’s testimony from a state court suppression hearing concerning the same events, in which
    Nabors didn’t mention the marijuana smell at all.
    The defense also confronted Nabors about his prior testimony that the VIN on the door of
    Fuchs’s car had been “painted over.” After seeing a photo of the VIN plate, Nabors conceded that
    the number was not actually painted over, and that his prior testimony was based solely on what
    he had been told by someone else.
    The defense then called Mayes, who by then was Chief of GPD. His testimony cast doubt
    on Nabors’s testimony in several ways. First, he didn’t believe that Nabors had accidentally
    activated the flashlight on his body camera, explaining that “Nabors knows more about that body
    cam than you think” and that he had previously started recording “in the middle” of stops. Mayes
    then testified that he did not smell marijuana upon encountering Fuchs, that he believed Nabors
    would have told him at the time if he smelled marijuana, and that he was surprised to hear that
    Nabors later claimed to have smelled marijuana. Mayes also stated that when he arrived, Fuchs
    was “just on the phone,” not making any suspicious movements.
    Finally, Mayes impeached Nabors’s credibility more generally. He explained that, within
    two weeks of becoming Chief, he disciplined Nabors twice and that Nabors quit the department
    shortly thereafter. Mayes also described his concerns with hiring Nabors initially, explaining that
    “no one else” had wanted to hire him because “he’s a bad apple.” And when asked if he would
    trust what Nabors said under oath, Mayes was blunt: “I don’t trust him, period. . . . He couldn’t
    -5-
    No. 21-5482, United States v. Fuchs
    even tell me the truth about just small things. . . . I could ask him a question just between us if
    something was going on, and he would just flat-out just lie to me.” Mayes’s testimony wasn’t all
    bad though. On cross, Mayes admitted that he didn’t remember anything that would “cause him
    to question” Nabors’s actions during the stop, and that Nabors had done “no wrong to Mr. Fuchs”
    that day.
    Even with the new evidence, the district court denied Fuchs’s motion to suppress the drugs
    but suppressed the statements Fuchs made while handcuffed. The court first credited Nabors’s
    testimony that Fuchs’s vehicle did not have a license plate, which was corroborated by body
    camera footage. The court then found credible Nabors’s testimony about Fuchs’s combative
    demeanor and furtive movements, which justified the decision to handcuff him as a safety
    precaution. Turning to Nabors moving Fuchs’s vehicle, the court explained first that Nabors’s
    action did not constitute a search under the Fourth Amendment at all because Nabors was not
    attempting to gather information. The court did not specifically address whether rolling up the
    driver’s door window to preserve any narcotics odors constituted a search. But in any event, the
    court noted that Nabors had probable cause to search the vehicle based on the marijuana smell.
    Recognizing that Nabors had failed to mention such a smell in his arrest affidavit or state court
    testimony, the district court nonetheless found his testimony credible; and while the court believed
    Mayes’s testimony that he did not smell marijuana, it noted that the odor could have dissipated
    through the vehicle’s open windows by the time Mayes arrived. The court then reviewed the
    evidence of Kilo’s reliability and concluded that his alert gave Nabors probable cause to search
    the vehicle. Finally, the court held that even if the vehicle search violated the Fourth Amendment,
    the exclusionary rule should not apply because the drugs inevitably would have been discovered
    when Fuchs’s vehicle was towed and inventoried.
    -6-
    No. 21-5482, United States v. Fuchs
    D.
    Fuchs proceeded to trial. Before trial, the government notified Fuchs that it intended to
    introduce his 2004 conviction for manufacturing methamphetamine. The district court ruled that
    the conviction was admissible. The court determined that the government was offering the
    conviction for two permissible purposes, knowledge and intent. It then explained that while the
    conviction was quite old, Fuchs had been incarcerated for most of the intervening period and noted
    that a limiting instruction could reduce the risk of prejudice.
    The government called Nabors as its first witness at trial. His testimony tracked his
    statements at the two suppression hearings. When Nabors relayed what dispatch had told him
    about Fuchs’s prior conviction for manufacturing methamphetamine, the judge interrupted and
    instructed the jury that it could consider that fact “only” for “the Defendant’s intent, motive and
    knowledge,” but not for “any other purpose.”1 The government did not enter the actual conviction
    record into evidence as an exhibit, and it did not come up again during Nabors’s testimony.
    The government next called Mayes, who testified that law enforcement had not been able
    to identify who owned the vehicle that Fuchs had been driving. On cross, Fuchs’s attorney asked
    Mayes questions similar to those he had posed to impeach Nabors in the second suppression
    hearing.
    The government’s next witness, a DEA chemist, testified that the substance recovered from
    Fuchs’s car was 475 grams of 99% pure methamphetamine.
    1
    Nabors mistakenly testified that dispatch had also relayed a prior burglary conviction. Fuchs’s
    attorney immediately objected and moved for a mistrial; the judge excused the jury. After some
    negotiation, the defense agreed to withdraw its motion conditioned on the judge informing the jury
    that Fuchs had no burglary conviction. When the jury returned, the judge told the jury just that
    and instructed it to disregard Nabors’s statement about the supposed burglary. Fuchs does not
    challenge these actions on appeal.
    -7-
    No. 21-5482, United States v. Fuchs
    Finally, the government called DEA special agent Lauren Carney to testify as an expert on
    drug trafficking. She explained that methamphetamine users typically purchase one gram at a
    time, that one ounce (approximately 28 grams) of methamphetamine sells for between $300 and
    $500 in the Memphis area, and that a pound (about 450 grams) of methamphetamine is
    “absolutely” a distributable amount. Towards the end of Carney’s direct examination, the
    following exchange occurred:
    Q: So in this case, we’ve identified about a pound of methamphetamine recovered
    in this traffic stop, right? And are you familiar with who was in that vehicle or
    was there anyone in the vehicle?
    A: I know there was a driver in the vehicle. I’m not really familiar with anything
    else[.]
    Q: In your opinion do traffickers with a pound or more of methamphetamine intend
    to distribute that methamphetamine?
    A: Yes. That’s a distributable amount.
    Q: And in this particular case who do you believe possessed that
    methamphetamine?
    A: I believe the driver was in possession of the methamphetamine.
    Q: And what is the basis for that opinion?
    A: Well, the driver was the sole occupant of the car. I believe the driver had a
    history of methamphetamine.
    The defense immediately asked for a sidebar, where Fuchs’s attorney objected that Carney’s
    mention of Fuchs’s history was “pure propensity” evidence and moved for a mistrial. He
    acknowledged, however, that the prosecutor did not “mean[] to” elicit that statement and did not
    “s[ee] it coming.” The court denied Fuchs’s mistrial motion and instructed the jury to disregard
    the prior question and response. After a brief cross and redirect, Carney stepped down and both
    parties rested.
    The jury found Fuchs guilty of possessing with the intent to distribute more than 50 grams
    of methamphetamine.
    -8-
    No. 21-5482, United States v. Fuchs
    II.
    Fuchs appeals his conviction on three grounds. First, he argues that the district court should
    have suppressed the drugs as the product of an unlawful search. Second, he contends that the court
    should have excluded evidence of his prior methamphetamine manufacturing conviction. Finally,
    Fuchs asserts that the court should have declared a mistrial after Carney mentioned his drug
    history.
    A.
    We begin with suppression. While we review the district court’s legal analysis on a
    suppression motion de novo, United States v. Haynes, 
    301 F.3d 669
    , 676 (6th Cir. 2002), Fuchs
    has little complaint about that aspect of the court’s decision. He primarily takes issue with several
    of the court’s factual findings: that his car didn’t have a license plate, that he was “combative”
    and made “furtive” movements, that Nabors smelled marijuana, and that Kilo reliably alerted to
    the presence of narcotics. In reviewing these findings, our role is limited to looking for clear error.
    
    Id.
     And because the contested findings all depend on Nabors’s credibility, our review is even more
    deferential. See Anderson v. City of Bessemer City, 
    470 U.S. 564
    , 575 (1985). The district court’s
    decision to credit the testimony of one witness over another is “virtually never” clear error, so long
    as the witnesses’ stories are facially plausible, internally consistent, and uncontradicted by
    extrinsic evidence. 
    Id.
    To his credit, Fuchs acknowledges that he faces an uphill battle. This case, he says, is “one
    of those rare cases” in which a witness’s story is so implausible that we must overrule the district
    court’s judgment that the story should be believed. We disagree.
    -9-
    No. 21-5482, United States v. Fuchs
    1.
    Fuchs first takes aim at the initial traffic stop. An officer may constitutionally stop a
    vehicle when he has probable cause to believe a traffic violation has occurred, United States v.
    Lott, 
    954 F.3d 919
    , 922 (6th Cir. 2020), and Tennessee law requires all vehicles to bear a rear
    license plate, 
    Tenn. Code Ann. § 55-4-110
    . In light of Nabors’s other inconsistencies and
    “convenient[]” failure to activate his body camera, Fuchs says the district court clearly erred in
    crediting Nabors’s testimony that Fuchs’s car did not have a license plate.
    We see no clear error. Nabors testified at both suppression hearings that Fuchs’s car lacked
    a license plate, Nabors’s body camera footage confirms that fact, and Fuchs presented no evidence
    to the contrary. Fuchs makes too much of the few minutes during which Nabors’s camera was off.
    Nabors said he made a mistake in pressing the wrong button on the camera—a mistake he chalked
    up to having “fairly big fingers”—while Mayes explained why he thought that excuse wasn’t
    believable. Both stories are “coherent,” “facially plausible,” “internally []consistent,” and “not
    contradicted by extrinsic evidence,” so the judge’s decision to believe Nabors cannot be clear error.
    Anderson, 
    470 U.S. at 575
    . Since Nabors observed Fuchs driving without a license plate, the initial
    traffic stop was lawful.
    2.
    Fuchs next challenges Nabors’s decision to handcuff him, arguing that doing so exceeded
    the lawful scope of the traffic stop. He does not dispute that during a stop, an officer who
    reasonably fears that a suspect is armed and dangerous may detain and handcuff him as a safety
    precaution. See United States v. Prigmore, 
    15 F.4th 768
    , 778 (6th Cir. 2021); United States v.
    Atchley, 
    474 F.3d 840
    , 849 (6th Cir. 2007). Rather, Fuchs says we shouldn’t believe Nabors’s
    description of his behavior.
    -10-
    No. 21-5482, United States v. Fuchs
    Again, we see no clear error. Start with what isn’t in dispute: The dispatcher told Nabors
    that Fuchs allegedly carries a firearm. No one contends that Nabors acted unreasonably in relying
    on that report. Cf. Herring v. United States, 
    555 U.S. 135
    , 146–48 (2009). Add to that Nabors’s
    account of Fuchs’s demeanor. Both at the time of the encounter (as captured by the body camera)
    and at the suppression hearing, Nabors described Fuchs as “combative.” See Atchley, 
    474 F.3d at 849
     (suspect’s nervous behavior and officer’s experience justified detention and handcuffing).
    Fuchs presented no evidence to rebut this description, and despite his request, we cannot say the
    district court clearly erred in refusing to throw out Nabors’s entire testimony based on Mayes’s
    impeachment of Nabors’s honesty. There, too, the district court was best positioned to determine
    who to believe. See Anderson, 
    470 U.S. at 575
    .
    Nor did the district court clearly err in crediting Nabors’s description of Fuchs’s suspicious
    movements during Nabors’s conversation with dispatch. On one hand, Nabors’s testimony aligned
    with his description of Fuchs’s behavior to the dispatcher (again captured by body camera
    footage); on the other, Mayes, who seemingly had a better vantage point, said Fuchs was just
    talking on the phone at that time. Our job is not to decide, in the first instance, whether to believe
    Mayes over Nabors. The clear-error standard “does not entitle a reviewing court to reverse the
    finding of the trier of fact simply because it is convinced it would have decided the case
    differently.” 
    Id. at 573
    . Nabors and Mayes both gave plausible, internally consistent accounts of
    Fuchs’s behavior, uncontradicted by extrinsic evidence, so the district court’s decision to credit
    the former cannot be clear error. 
    Id. at 575
    .
    In light of Fuchs’s demeanor, behavior, and alleged firearm possession, Nabors reasonably
    feared for his and Mayes’s safety, so he did not violate the Fourth Amendment in detaining and
    handcuffing Fuchs.
    -11-
    No. 21-5482, United States v. Fuchs
    3.
    That brings us to Fuchs’s challenge to Nabors’s moving his vehicle and rolling up the
    window, and (almost) to the first legal question of this case: Did Nabors’s actions constitute a
    “search” within the meaning of the Fourth Amendment? But before we can reach that question,
    Fuchs must overcome yet another factual hurdle. The district court credited Nabors’s testimony
    that he smelled marijuana upon initially encountering Fuchs. Unless that finding is clearly
    erroneous, it does not matter whether Nabors conducted a “search”; the marijuana smell alone
    would have given Nabors probable cause to search Fuchs’s car under the automobile exception to
    the warrant requirement. United States v. Johnson, 
    707 F.3d 655
    , 658 (6th Cir. 2013).
    Here again, Fuchs falls short of demonstrating clear error. Nabors testified at both
    suppression hearings that he smelled marijuana upon encountering Fuchs, even after repeated
    clashes over the issue on cross-examination. Fuchs’s lawyer asked Nabors point blank, “You
    didn’t smell marijuana, did you?” And Nabors stood his ground: “Yes, sir. I did.” Mayes’s
    contrary testimony does not require reversal. As the district court noted, because Mayes arrived
    later, it is possible that the smell had dissipated by the time he arrived. That’s a possibility we
    cannot ignore since we must take the evidence in the light most favorable to the government.
    Haynes, 
    301 F.3d at 676
    . Moreover, even if their stories had been irreconcilable, both were
    plausible and consistent with the extrinsic evidence, so the district court could not have clearly
    erred by choosing Nabors’s story over Mayes’s. Anderson, 
    470 U.S. at 575
    .
    What about the objective evidence that Nabors didn’t mention the marijuana smell to
    Mayes on the scene, or in his arrest affidavit or state court testimony? Nabors gave plausible
    explanations for the first two supposed contradictions: His attention was focused on officer safety
    by the time Mayes arrived; and when he wrote the arrest ticket, he keyed in on Kilo’s alert because
    -12-
    No. 21-5482, United States v. Fuchs
    that was why he searched the car. As for the state court testimony, Fuchs’s counsel didn’t give
    Nabors an opportunity to explain; he simply introduced the transcript, then moved to other matters,
    so we don’t know why Nabors failed to mention the marijuana odor at that hearing. Because each
    alleged contradiction had a plausible explanation, the district court was left to make another
    credibility judgment. Exercising its “wide latitude” in that area, Haynes, 
    301 F.3d at 679
    , and
    based on its unique opportunity to view each witness’s demeanor and tone, Anderson, 
    470 U.S. at 575
    , the court decided to believe Nabors’s story, notwithstanding his other omissions. Whether
    we would make that same judgment is irrelevant. All we may decide is whether the court clearly
    erred in believing Nabors. 
    Id.
     at 580–81. That’s a high bar, and Fuchs cannot clear it.2
    Because the marijuana smell gave Nabors probable cause to search Fuchs’s vehicle, the
    district court properly denied Fuchs’s motion to suppress. We need not address Kilo’s reliability,
    the inevitable-discovery rule, or whether rolling up Fuchs’s car window was a search.
    B.
    In the second issue on appeal, Fuchs argues that the district court erred by admitting
    evidence of his 2004 conviction for manufacturing methamphetamine. According to Fuchs, the
    conviction had little (if any) probative value for a permitted purpose such as knowledge or intent,
    yet was quite likely to be used by the jury to show propensity—once a drug dealer, always a drug
    dealer. See Fed. R. Evid. 403, 404. Fuchs’s argument implicates two intra-circuit splits, see United
    States v. Carter, 
    779 F.3d 623
    , 625 (6th Cir. 2015) (standard of review); United States v. Hardy,
    2
    Fuchs directs our attention to Bullman v. City of Detroit, 787 F. App’x 290, 298 (6th Cir. 2019),
    in which we held that “the fact that the officers did not discover any marijuana in [the suspect’s]
    car raises a question about the credibility of the officers’ account that” they smelled marijuana.
    That holding does not undermine our conclusion that the district court did not clearly err. Bullman
    stands for the simple proposition that failure to discover marijuana can undermine an officer’s
    claim to have smelled marijuana. That fact, like the officer’s demeanor and tone, may enter the
    factfinder’s calculus of whether to believe the officer, but it is by no means dispositive.
    -13-
    No. 21-5482, United States v. Fuchs
    
    643 F.3d 143
    , 152 (6th Cir. 2011) (permissible purpose of prior drug conviction), and raises
    unexplored questions about how temporal proximity affects admissibility. We need not tackle
    those issues today, though, because we are convinced that any error was ultimately harmless.
    Rule 52 of the Federal Rules of Criminal Procedure dictates that we “must” disregard any
    error that does not affect the defendant’s substantial rights. Fed. R. Crim. P. 52(a).         The
    government bears the burden of showing harmlessness. United States v. Kettles, 
    970 F.3d 637
    ,
    644 (6th Cir. 2020).    If we can say “with fair assurance” that the jury’s verdict was not
    “substantially swayed” by the error, then it cannot be a basis for reversal. Kotteakos v. United
    States, 
    328 U.S. 750
    , 765 (1946).
    The government’s case against Fuchs meets this standard. To secure a conviction, the
    government had to prove that Fuchs knowingly possessed a controlled substance with intent to
    distribute. 
    21 U.S.C. § 841
    (a)(1); United States v. Allen, 
    619 F.3d 518
    , 522 (6th Cir. 2010).
    Consider the undisputed evidence that all parties agree was fair game: Fuchs was the sole
    occupant of a vehicle in which over a pound of methamphetamine was found; the car was not
    registered to anyone else and there was no other known driver; a baggie with methamphetamine
    residue was found in the floorboard of the driver’s seat, next to Fuchs’s shoes; and a pound of
    methamphetamine is “absolutely” a distributable quantity3—thousands of doses worth over
    $5,000.
    3
    Fuchs argues on appeal that a pound of methamphetamine would be only a ninety-day supply for
    a heavy user like himself. But he didn’t make this argument or offer any evidence to support it at
    trial. Indeed, when cross-examining Carney, Fuchs’s counsel seemed to concede that this was a
    distributable quantity:
    Q: Just so we’re clear, this is not a possessory or small amount. You can’t use this
    in one day or one week. This is a whole lot of meth, do you agree with that?
    A: Agreed.
    Q: No doubt this is to be sold?
    A: Yes.
    -14-
    No. 21-5482, United States v. Fuchs
    Fuchs himself seems to acknowledge the weight of the government’s evidence. In arguing
    that his prior conviction was only minimally probative of his intent and knowledge, he concedes
    that “the government had plenty of evidence that [he] was the sole occupant of the vehicle where
    the methamphetamine was found, which would establish knowledge and intent.” Such alternative-
    proof reasoning is an effective way of diminishing the probative value of a challenged piece of
    evidence. See Old Chief v. United States, 
    519 U.S. 172
    , 183 (1997). But in the harmlessness
    context, it amounts to a defendant “fall[ing] on his own sword.” United States v. Ayoub, 
    498 F.3d 532
    , 548 (6th Cir. 2007); see also Hardy, 
    643 F.3d at
    153–54. Nor is this a case in which the
    alternative evidence tends to prove one, but not all elements of the offense, see United States v.
    Jenkins, 
    593 F.3d 480
    , 486 (6th Cir. 2010) (noting government offered overwhelming evidence of
    knowledge and intent, but not possession); see also Hardy, 
    643 F.3d at 160
     (Cole, J., dissenting)
    (limiting Ayoub’s harmlessness analysis to cases in which the evidence is overwhelming on every
    element); Fuchs’s sole occupancy of the vehicle is all but conclusive evidence of possession too.
    Finally, although we recognize that evidence of earlier crimes often has “a powerful and
    prejudicial impact,” United States v. Johnson, 
    27 F.3d 1186
    , 1193 (6th Cir. 1994), the
    government’s trial strategy lessened that likelihood in this case. After introducing the prior
    conviction through Nabors, the government immediately moved to other matters. The government
    did not elicit, through Nabors or anyone else, the details of that conviction, nor did it enter the
    conviction record into evidence. The matter briefly arose again during Carney’s testimony, but
    the court immediately instructed the jury to disregard her comment.           And in closing, the
    government brought up the prior conviction, but said only that the jury could consider that evidence
    for “intent, motive and knowledge in this crime,” without elaborating on how the conviction would
    tend to prove those facts. In light of the other very strong evidence against Fuchs and the
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    No. 21-5482, United States v. Fuchs
    government’s minimal use of the prior conviction, we are convinced that any error in admitting
    the conviction was harmless.
    C.
    Finally, Fuchs contends that the district court should have declared a mistrial after Carney
    testified that Fuchs “had a history of methamphetamine.” We review the denial of a motion for a
    mistrial for abuse of discretion. United States v. Howard, 
    621 F.3d 433
    , 458 (6th Cir. 2010). For
    a motion based on improper testimony, we first ask whether the statements were in fact improper.
    
    Id.
     If so, we assess whether the testimony’s damage was incurable based on five factors:
    (1) whether the remark was unsolicited, (2) whether the government’s line of
    questioning was reasonable, (3) whether the limiting instruction was immediate,
    clear, and forceful, (4) whether any bad faith was evidenced by the government,
    and (5) whether the remark was only a small part of the evidence against the
    defendant.
    
    Id. at 459
     (quoting Zuern v. Tate, 
    336 F.3d 478
    , 485 (6th Cir. 2003)).
    There is little dispute that Carney’s remark was improper. The government conceded as
    much in the sidebar that immediately followed her statement, agreeing that the court should strike
    the testimony and instruct the jury to disregard it. And while the prior conviction had been
    admitted for limited purposes under Rule 404(b), Carney’s testimony employed that conviction
    for a prohibited purpose: propensity. See Fed. R. Evid. 404(a).
    But Fuchs’s success on the threshold question doesn’t extend much further. Four of the
    Howard factors favor the district court’s decision not to declare a mistrial. Fuchs admits that
    Carney’s remark was not solicited. Nor was it “foreseeable.” After the prosecutor elicited that
    Carney knew that there was a “driver in the vehicle” and that she believed “the driver was in
    possession of the methamphetamine,” the prosecutor asked Carney’s basis for that opinion.
    Having discussed only the occupancy of the vehicle, all that was foreseeable was the first sentence
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    No. 21-5482, United States v. Fuchs
    of Carney’s response: “Well, the driver was the sole occupant of the car.” The prosecutor could
    not reasonably have known that Carney would bring up Fuchs’s drug history. That’s especially
    true in light of, as Fuchs’s attorney put it to the district court, Carney’s “responsibility as a DEA
    agent not to bring up prior convictions for the jury.” Moreover, Fuchs concedes that the district
    court’s limiting instruction was immediate and clear. He never alleges that bad faith motivated
    the prosecutor’s question, and, in fact, admitted in the district court that the prosecutor did not
    “mean[] to” elicit a response about the prior conviction. And, as explained above, the prior
    conviction was ultimately a small part of the case against Fuchs.
    Fuchs is right that the line of questioning was unreasonable. “In a criminal case, an expert
    witness must not state an opinion about whether the defendant did or did not have a mental state
    or condition that constitutes an element of the crime charged or of a defense.” Fed. R. Evid. 704(b).
    Experts may speak in hypotheticals without running afoul of this rule; that is, they may “describe[]
    in general terms the common practices of those who clearly do possess the requisite” mental state.
    United States v. Combs, 
    369 F.3d 925
    , 940 (6th Cir. 2004) (quoting United States v. Frost,
    
    125 F.3d 346
    , 383 (6th Cir. 1997)). But the government went beyond that here. The prosecutor
    asked Carney about who “in this particular case” possessed the methamphetamine, and Carney
    answered, “the driver” based on the fact that, in this case, “the driver” was the sole occupant of
    the car. She testified, in other words, about Fuchs’s mental state—knowing possession—not the
    mental state of a hypothetical defendant in similar circumstances.
    But tellingly, Fuchs did not object to the line of questioning on this ground in the district
    court. And we see little harm in the fact that Carney’s opinion was couched in too specific terms.
    Had it heard the same testimony in the form of the “common practice[]” that sole occupants of a
    vehicle with drugs inside “clearly do possess the requisite” knowledge of those drugs, the jury
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    No. 21-5482, United States v. Fuchs
    would readily have drawn the inference that Fuchs, “caught engaging in more or less the same
    practice[],” knew about the drugs. Combs, 
    369 F.3d at 383
     (quoting Frost, 
    125 F.3d at 384
    ).
    In sum, four of the five Howard factors are squarely in the government’s favor, and the
    only factor on Fuchs’s side carries little weight on this record. The district court did not abuse its
    discretion in denying Fuchs’s motion for a mistrial.
    ***
    For the reasons above, we AFFIRM the judgment of the district court.
    -18-