United States v. Rivera-Galindez ( 2021 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 18-1648
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    CHRISTIAN RIVERA GALÍNDEZ,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF PUERTO RICO
    [Hon. Pedro A. Delgado Hernández, U.S. District Judge]
    Before
    Thompson, Lipez, and Barron,
    Circuit Judges.
    Rick Nemcik-Cruz for appellant.
    Francisco A. Besosa-Martínez, Assistant United States
    Attorney, with whom W. Stephen Muldrow, United States Attorney,
    and Mariana E. Bauzá-Almonte, Assistant United States Attorney,
    Chief, Appellate Division, were on brief, for appellee.
    June 2, 2021
    THOMPSON, Circuit Judge.
    Overview
    An apartment search by the Puerto Rico police led to
    Christian Rivera Galíndez's arrest and indictment for possessing
    and aiding and abetting the possession of drugs (cocaine, crack,
    and marijuana) with intent to distribute them; and possessing and
    aiding and abetting the possession of a gun (a green and black
    .40-caliber Glock pistol with an obliterated serial number) in
    furtherance of a drug-trafficking crime (we will sometimes shorten
    the second charge to "gun possession" or some variant of that, for
    easy       reading).1    Culpable    possession      may   be    "actual    or
    constructive," as well as "sole or joint."           See United States v.
    Tanco-Baez, 
    942 F.3d 7
    , 25 (1st Cir. 2019) (quotation marks
    omitted).2       And the government premised its case on his having
    1Per "Spanish naming conventions, if a person has two
    surnames, the first (which is the father's last name) is primary
    and the second (which is the mother's maiden name) is subordinate."
    United States v. Martínez-Benítez, 
    914 F.3d 1
    , 2 n.1 (1st Cir.
    2019). So we use "Rivera" instead of "Rivera Galíndez" from now
    on.
    Also keep the
    2                    following    in   mind   as    we   approach   the
    controversy before us:
    •    Constructive possession exists if "a person knowingly has the
    power at a particular time to exercise dominion and control
    over an object." United States v. Nuñez, 
    852 F.3d 141
    , 145
    (1st Cir. 2017) (quotation marks omitted).
    •    "Dominion and control over an object" often "may be found
    through inference, based on a showing of dominion and control
    over the area in which the object is found." 
    Id.
    - 2 -
    constructively possessed the drugs and the gun, because when the
    police came to the apartment with a search warrant in hand, they
    found him in a room with these items and only he had a key that
    opened a padlock on the apartment's front gate (an officer tried
    a key on Rivera's key chain, and it worked).
    In the run-up to trial, Rivera moved to suppress the
    seized evidence.3    Testifying at a motion hearing, he claimed that
    the police had confronted him and his girlfriend as they sat in a
    car near the apartment; searched them and his auto; ordered them
    to go upstairs to the apartment's living room, on pain of being
    tasered if they refused; kept them there as they rifled through
    the rooms; showed him the drugs and the gun, a pistol he recognized
    as being the one he had hidden in his car; and then hauled them
    away in cuffs, with the seized items in tow.       The defense's major
    theme was that the police had taken the gun from his car and
    planted it in the apartment to link him to the drugs there.           The
    district   judge    denied   the   motion,   however,   a   ruling   left
    unchallenged on appeal.
    •   And "constructive possession may be found based wholly on
    circumstantial evidence." 
    Id.
    FYI, one codefendant found in the apartment with Rivera pled
    3
    guilty to the gun-possession charge and another codefendant pled
    guilty to the cocaine-possession and gun-possession charges.
    - 3 -
    The trial proceeded apace.       And we will have a lot to
    say about what went on there.        But for now it is enough to note
    the following.4      The government elicited testimony showing that
    agents found Rivera and others in one of the apartment's bedrooms
    — the very room where they discovered the gun (on a bed, partially
    obscured by a pillow) and some of the drugs.            He — and only he —
    had a key that opened the padlock (as we just said).               And his
    cellphone had photos of drugs.      He did not take the stand at trial.
    But   his   lawyer    tried   to   poke    holes   in    the   government's
    constructive-possession theory through cross-examination, which
    Rivera's team hoped would persuade the jury that he had no control
    over the apartment and so did not constructively possess the drugs
    or the gun.   Apparently unconvinced by the defense's efforts, the
    jury convicted him on all charges.
    Still proclaiming his innocence, Rivera attacks four
    evidentiary rulings and three jury instructions.          We move straight
    to his arguments, laying out the relevant background as needed.
    But to give away our conclusion up front, because he offers no
    winning ground to reverse, we affirm.
    4The background events are essentially undisputed unless
    otherwise noted.
    - 4 -
    Evidentiary Issues
    Like the parties, we start with Rivera's complaints
    about some of the judge's evidentiary decisions.                    The first
    concerns the judge's ruling admitting evidence of Rivera's prior
    gun conviction in a Puerto Rico court — a conviction since vacated
    by a Puerto Rico appellate court.           The second concerns the judge's
    ruling   barring    the    defense   from    impeaching   an   agent   with   a
    statement   in     his    police   report    by   a   codefendant   that   the
    codefendant had bought the padlock and had a key to it.             The third
    concerns the judge's ruling excluding audio from a police video of
    the apartment search that captured Rivera's telling an agent that
    a key seized belonged to the car that the police had already
    searched.   And the fourth concerns the judge's ruling blocking the
    defense from questioning an agent about the "work plan" for the
    execution of the search warrant.
    The government argues that the judge committed no error
    — but if he did, any error was harmless.
    Standards of Review
    We review preserved objections to evidentiary rulings
    for abuse of discretion, reversing only if any abused discretion
    caused more than harmless error.              See, e.g., United States v.
    Taylor, 
    848 F.3d 476
    , 484 (1st Cir. 2017) (explaining that the
    burden is on the government to show that any nonconstitutional
    - 5 -
    evidentiary error did not affect substantial rights, i.e., that
    "it is highly probable that the error did not contribute to the
    verdict" (quotation marks omitted)); United States v. Shea, 
    159 F.3d 37
    , 40 (1st Cir. 1998) (same).          But we review unpreserved
    objections for plain error, which is — by design — extremely hard
    to establish:        an appealing party must show not just error but
    error that is plain (which means an irrefutable error given binding
    precedent), that is prejudicial (which almost always requires that
    the error affected the proceeding's outcome), and that if not made
    right by us (using our discretion) would seriously undermine the
    fairness, integrity, or public perception of the judicial system.
    See, e.g., United States v. Rivera-Carrasquillo, 
    933 F.3d 33
    , 48
    n.14, 55 (1st Cir. 2019), cert. denied, 
    140 S. Ct. 2691
     (2020).
    Rivera's Since-Vacated Prior Conviction
    About a month before Rivera committed the acts alleged
    in   the   federal    indictment,   he   (according   to   a   Puerto   Rico
    complaint) illegally possessed and used a green and black .40-
    caliber Glock pistol, one of five charges (including murder and
    aggravated robbery) that a nonunanimous jury convicted him on in
    a Puerto Rico court (a witness described the gun, apparently — the
    police never recovered it).         Over the defense's objection, the
    judge in our case made two key rulings regarding the admissibility
    of the illegal-gun-possession conviction.        Citing Federal Rule of
    - 6 -
    Evidence    404(b),    the   judge    found   the   evidence   "special[ly]
    probative . . . for knowledge and intent," because it shows, "if
    the jury decides to credit it," that Rivera "knew what the firearm
    was, how to possess the firearm, how to carry and use a firearm"
    — which was "a military green and black" pistol, like the one in
    the federal case.5       And citing Federal Rule of Evidence 403, the
    judge    found   the   evidence's    probative   value   not   substantially
    outweighed by any unfair prejudice, because the government would
    introduce a redacted judgment omitting any reference to the other
    convictions (including the ones for murder and aggravated robbery)
    5 Taking a swipe at the judge's "knew what a firearm was"
    comment, Rivera notes how a district judge in a different circuit
    did not think much of the government's argument that a defendant's
    prior gun-related convictions should come in under 404(b) to show
    "[t]hat he knew what a firearm was," plus "he knew that what he
    had in his possession was in fact a firearm." "[D]o we really
    think that there's anybody in the world who doesn't know what a
    gun is?" the judge there asked. See United States v. Adams, 
    783 F.3d 1145
    , 1147 (8th Cir. 2015). But the problem for Rivera is
    that the Adams judge admitted the prior convictions.       And the
    appellate court found no abuse of discretion.     See id. at 1149
    (commenting that "[w]e have held on many occasions that prior
    convictions of firearm offenses are admissible to prove that the
    defendant had the requisite knowledge and intent to possess a
    firearm").
    - 7 -
    and because the judge would warn the jury against using this
    evidence to infer bad character.6
    Testifying   for   the    government   at   trial,   an   agent
    described the gun taken during the apartment search as "black on
    the top and like military color on the bottom" — with the two-
    tones being "unusual," because the gun "doesn't come from the
    factory in that manner."     The agent also noted that the police
    found Rivera "in possession of a green, military green and black
    pistol" roughly a month before the events giving rise to the
    federal charges. And the government entered into evidence redacted
    versions of the Puerto Rico complaint and judgment — which (among
    other things) made clear that a Puerto Rico jury found him guilty
    of carrying "a military green and black gun" (language taken from
    the complaint).
    The judge then gave an immediate limiting instruction,
    telling the jurors that
    6 The government first argued that the gun "was similar to
    the gun in this case" and later argued that it was "actually the
    same gun" given its "unique" and "peculiar" color scheme. Rivera's
    briefs claim that the prosecution's ballistics expert in the Puerto
    Rico case totally debunked the same-gun theory. As support, his
    briefs cite to defense counsel's argument to the district judge
    about what he heard had happened at the Puerto Rico trial (counsel
    did not represent Rivera during the Puerto Rico proceedings). But
    because attorney argument is not evidence, see United States v.
    Chisholm, 
    940 F.3d 119
    , 128 (1st Cir. 2019), this line of attack
    does not affect our analysis.
    - 8 -
    the conviction you just heard about is not
    evidence that the defendant has a bad
    character or that he acted here in conformity
    with any such character.     You may consider
    that conviction as evidence that he knew what
    a firearm was, how to possess the firearm, how
    to carry it from one location to another
    location and how to use it.
    The judge added that
    [y]ou may also consider that conviction as
    evidence of intent to possess that firearm in
    this case.   You should also know that the
    conviction, which took place in the Puerto
    Rico Court of First Instance, is on appeal.
    The   judge's   final   charge   to   the   jurors   included   a   similar
    instruction.    "A particular item of evidence," the judge said,
    is sometimes received for a limited purpose
    only. That is, it can be used by you only for
    one particular purpose and not for any other
    purpose.   You may recall that such occurred
    during trial, and I instructed you on the
    purposes for which the item could and could
    not be used.
    "In particular," the judge explained,
    you heard evidence that the defendant was
    convicted in the Court of First Instance of
    Puerto Rico of carrying and using without a
    license in violation of Puerto Rico law a
    military green and black pistol.        The
    conviction is on appeal.
    "It is not evidence," the judge pointed out,
    that the defendant has a bad character or that
    he acted here in conformity with any such
    character.   You may consider it as evidence
    that he knew what a firearm was, how to possess
    it, how to carry it from one location to
    another, and how to use it, as well as for
    - 9 -
    whether [he] had the state of mind or intent
    necessary to commit the crime charged in . . .
    the [i]ndictment.
    Rivera voiced no objections to these instructions.
    Rivera thinks the judge gaffed it by ruling that the
    prior-conviction     evidence   had    special    relevance   and   was   not
    unfairly prejudicial.     The government, contrastingly, thinks the
    judge got it exactly right.
    404(b) bans other-acts evidence in some situations but
    allows it in others.      "Evidence of . . . crime[s], wrong[s], or
    act[s]" (other than ones at issue in the case) may not be offered
    to "prove a person's character" but may be offered if it has some
    special, noncharacter-based relevance — like to prove knowledge or
    intent.   See, e.g., Fed. R. Evid. 404(b); United States v. Sabean,
    
    885 F.3d 27
    , 35-36 (1st Cir. 2018).               Pertinently for present
    purposes, a judge performing a 404(b) analysis must ask whether
    the other-acts evidence is specially relevant to something other
    than a defendant's character, see Sabean, 885 F.3d at 35 — knowing
    that   the     special-relevance      "standard    is   not   particularly
    demanding," see United States v. Wyatt, 
    561 F.3d 49
    , 53 (1st Cir.
    2009) (quotation marks omitted).        If the answer is yes, the judge
    must then ask whether the evidence's admission would violate 403
    — which bars evidence that causes prejudice that substantially
    outweighs its probative worth.         See Sabean, 885 F.3d at 35; see
    - 10 -
    also United States v. Saccoccia, 
    58 F.3d 754
    , 778 (1st Cir. 1995)
    (emphasizing that we give a "high degree of deference" to a judge's
    "balancing          of   probative   value    against    unfairly        prejudicial
    effects").          And if the answer is no, the judge can admit the
    evidence unless it is excludable under some other rule.
    As a constructive-possession case — again, prosecutors
    claimed Rivera constructively possessed the pistol — a key issue
    was "whether the defendant was in knowing possession."7                   See United
    States v. Aguilar-Aranceta, 
    58 F.3d 796
    , 798 (1st Cir. 1995); see
    also United States v. Ridolfi, 
    768 F.3d 57
    , 61-62 (1st Cir. 2014)
    (recognizing that "[c]onstructive possession of a firearm may be
    established when a person knowingly has the power and intention at
    a given time of exercising dominion and control over it either
    directly       or    through   others"     (quotation   marks      and    alteration
    omitted)); United States v. McLean, 
    409 F.3d 492
    , 501 (1st Cir.
    2005) (stating that, when it comes to constructive possession,
    "the       requisite     knowledge   and   intention    can   be    inferred   from
    circumstances, such as a defendant's control over the area where
    the contraband is found").            And because this element can be hard
    to establish, what with defendants often implying that they were
    As we will see later (when we take up the instructional
    7
    issues), Rivera thinks the judge reversibly erred by using the
    "knowing" mental state for this offense — but he is wrong.
    - 11 -
    "merely . . . innocent and unknowing bystander[s]" (as Rivera's
    team tried to do on cross-examination), other-acts evidence may be
    specially relevant to establish knowledge and intention.                    See
    Aguilar-Aranceta, 
    58 F.3d at 799
    ; United States v. Powell, 
    50 F.3d 94
    , 100 (1st Cir. 1995).        Powell nicely illustrates that point.         A
    case involving firearm possession by a felon, Powell held that
    evidence of the defendant's prior gun possession "had special
    relevance" to "whether [he] possessed firearms in the months
    preceding"     the   charged   crime,     "had   an   opportunity   to   obtain
    firearms," and "had knowledge of the availability of firearms."
    See 
    50 F.3d at 100
     (quotation marks omitted); see 
    id.
     (noting our
    prior approval of "the power and the intention" formulation in
    discussing "actual or constructive" possession (quotation marks
    omitted)).
    That Rivera had the same or similar gun about a month
    before the facts giving rise to the federal indictment is specially
    relevant       to    the       constructively-possessing-a-gun           charge
    (independent of any taboo character inferences).             See 
    id.
     at 100-
    01; see also United States v. Lugo Guerrero, 
    524 F.3d 5
    , 14 (1st
    Cir.   2008)   (holding    that   prior    robberies    "occurr[ing]     within
    fifteen months of the [charged] robbery" were not too remote in
    time to be specially relevant); United States v. Fields, 
    871 F.2d 188
    , 198 (1st Cir. 1989) (explaining that "there is no absolute
    - 12 -
    rule governing the number of years that can separate offenses").
    But wait, says Rivera.         The other-acts evidence, he correctly
    notes, must be "similar" to the charged crime "to demonstrate the
    unlikeliness   that    the    defendant"          had   innocent-and-unknowing-
    bystander status.     See Aguilar-Aranceta, 
    58 F.3d at 799
     (emphasis
    added).   And to his way of thinking, the requisite similarity is
    missing here, because (for example, and to quote his brief) the
    federal   "charge     is     possessing       a     gun    (constructively)   in
    furtherance of a drug trafficking crime" while the Puerto Rico
    charge was "carrying a firearm without a license."                      We think
    otherwise, however, given the dead-on similarities between the gun
    in the federal case and the gun in the Puerto Rico case — both
    were green and black .40-caliber Glocks, do not forget. See Wyatt,
    
    561 F.3d at 53
     (stressing that other-acts evidence need not be
    identical to the charged offense as long as it has "enough . . .
    similarity" to allow a jury to infer defendant's knowledge).
    Which     segues    into   Rivera's       next    argument.    Perhaps
    sensing vulnerability on the similarity front, he attacks the idea
    that a "two-toned" Glock is in any way "unique" or "unusual."
    Telling us that Glocks are "ubiquitous in Puerto Rico," he claims
    that the manufacturer produces pistols with two tones — without,
    however, citing any record evidence to support either assertion.
    Having failed to raise these arguments below, he must establish
    - 13 -
    plain error.   But he makes no attempt to do so.   And because it is
    not our job to fill in that gap, his "failure waives this claim."
    See United States v. Cruz-Ramos, 
    987 F.3d 27
    , 40 (1st Cir. 2021)
    (citing a bunch of cases); see also United States v. Rodríguez-
    Torres, 
    939 F.3d 16
    , 40 (1st Cir. 2019); Rivera-Carrasquillo, 933
    F.3d at 49.8
    Shifting gears, Rivera contends that the other-acts
    evidence had "negligible" probative value on the "knowledge or
    intent" issues.    And that is because, the argument continues
    (emphasis ours), "he didn't bring his pistol to the apartment,"
    but rather the police did.    Not only did he surface this argument
    in his reply brief (he omitted it from his opening brief), which
    means it comes too late.     See Cruz-Ramos, 987 F.3d at 43; Small
    Justice LLC v. Xcentric Ventures LLC, 
    873 F.3d 313
    , 323 n.11 (1st
    Cir. 2017).    But his appellate lawyer (who was not his trial
    lawyer) conceded at oral argument that he could not say that this
    theory ever reached the jury, because he did not order a transcript
    "of that part of the case."    See Rodríguez v. Señor Frog's de la
    8  Sticking with the color issue, Rivera blasts the judge's
    "limiting instruction" for "higlight[ing] the similar color of the
    two guns." But his silence in the face of this instruction means
    he must prove plain error — a feat he does not even try, which
    dooms this argument.    See, e.g., Cruz-Ramos, 987 F.3d at 40;
    Rodríguez-Torres, 939 F.3d at 40; Rivera-Carrasquillo, 933 F.3d at
    49.
    - 14 -
    Isla, Inc., 
    642 F.3d 28
    , 37 (1st Cir. 2011) (holding that because
    the   "[p]art[y]   pursuing   appellate   review"   did   not   provide   a
    transcript we need to perform our appellate function, that party
    could not "prevail on [an] issue" it sought to press).             Either
    way, this aspect of his 404(b) complaint is not a difference-
    maker.
    Rivera's next argument requires a little more context.
    After initial briefing and oral argument here, the Supreme Court
    issued Ramos v. Louisiana, 
    140 S. Ct. 1390
     (2020) — a decision
    holding that the Constitution requires a unanimous verdict to
    convict a defendant of a serious offense.     Id. at 1394, 1402.     Hard
    on the heels of Ramos, Puerto Rico's appeals court vacated Rivera's
    conviction for illegally possessing the green and black pistol
    (along with the other convictions in that case) and remanded for
    a new trial.   See People v. Rivera Galíndez, KLAN 201701085, 
    2020 WL 4741358
     (P.R. Ct. of App. May 20, 2020) (certified translation
    provided by Rivera and on file with the First Circuit, at Docket
    No. 52) (noting that Puerto Rico's Supreme Court has "held that,
    in light of [Ramos], a conviction entered by way of a nonunanimous
    verdict in our jurisdiction transgresses the procedural safeguards
    inherent to the fundamental right to a trial by jury").             So we
    ordered supplemental briefing to address the following question:
    What impact (if any) does the Ramos decision
    and Appellant Rivera-Galíndez's vacated prior
    - 15 -
    conviction    have    on    the    challenged
    admissibility of the government's evidence at
    trial and any other issues raised on appeal
    before this Court?
    Responding to our directive, Rivera argues that because
    "[t]he prior conviction was overturned" following the Supreme
    Court's recently issued Ramos opinion, it should play no role in
    the 404(b) analysis.      To hear him tell it, "[t]he void conviction
    negates the validity of the documentary evidence of [his] prior
    bad acts," creates "serious doubt" as to "the validity of" the
    agent's testimony, and "constitute[s] a due process violation."
    Not true, writes the government, pointing to a Supreme Court case
    holding other-acts evidence admissible under 404(b) even though a
    jury had acquitted the defendant of that act, see Dowling v. United
    States, 
    493 U.S. 342
    , 348-49 (1990), and a sibling circuit case
    finding a prior conviction admissible under 404(b) even though an
    appellate court later reversed that conviction, see United States
    v. Sneezer, 
    983 F.2d 920
    , 924 (9th Cir. 1992).9
    The government also notes (without contradiction) that
    Rivera   never   argued   below   that   the   other-acts   evidence   was
    inadmissible because of the nonunanimous verdict. Of course, "[t]o
    9 We ourselves have noted that         "404(b) by its own terms is
    not limited to evidence of offenses        resulting in convictions, as
    it refers to other crimes, wrongs,         or acts."   United States v.
    Arboleda, 
    929 F.2d 858
    , 867 (1st           Cir. 1991) (quotation marks
    omitted).
    - 16 -
    preserve a claim, a litigant must" put it forward in the district
    court even if the law "is against him" at that time — or else he
    must show plain error.   See United States v. Acosta-Colón, 
    741 F.3d 179
    , 201 n.12 (1st Cir. 2013); see also United States v.
    Cotton, 
    535 U.S. 625
    , 628-29, 631-32 (2002); Johnson v. United
    States, 
    520 U.S. 461
    , 464 (1997).10    But by not even trying to
    make that showing, he waived this facet of his 404(b) challenge.
    See, e.g., Cruz-Ramos, 987 F.3d at 40; Rodríguez-Torres, 939 F.3d
    at 40; Rivera-Carrasquillo, 933 F.3d at 49.11
    So despite what Rivera argues, the other-acts evidence
    had special relevance to the knowledge and intent issues in the
    10 That we requested supplemental briefs on Ramos does not
    excuse Rivera from having to show plain error. A case in point is
    McLean. There, like here, the Supreme Court issued an important
    opinion after oral argument before us — i.e., United States v.
    Booker, 
    543 U.S. 220
     (2005), where the Supreme Court held that
    mandatory application of the federal sentencing guidelines
    infracted the Constitution. So we ordered supplemental briefing
    on that case's impact. 
    409 F.3d at 504
    . But because the appellant
    had not raised any point below that could have preserved the issue
    — e.g., he had not argued that the then-existing guideline regime
    offended the Constitution — he had to prove plain error. 
    Id. at 505
    .
    11 A couple more comments before turning to the unfair-
    prejudice prong of the admissibility test. One: Given our ruling,
    we need not consider the many arguments in Rivera's supplemental
    brief for why the judge's decision was not harmless error. Two:
    We need not consider his supplemental brief's claim that the judge
    imposed an "erroneous" sentence. After all, our order limited the
    supplemental briefs to explaining what effect (if any) the Ramos
    decision and the vacating of his Puerto Rico conviction had on the
    "issues raised on appeal." And Rivera raised no sentencing issues
    in his initial briefs.
    - 17 -
    case.     And we can quickly dispose of his claim that the judge
    should have excluded the evidence as unfairly prejudicial under
    403 (recall that even if specially relevant, the danger of unfair
    prejudice cannot substantially outweigh the evidence's probative
    value).     As best we understand his prejudice theory, he argues
    that the judge's error in admitting the other-acts evidence caused
    him not "to testify because his credibility before the jury was
    damaged."     But the premise of his argument is wrong — his bid to
    show error here fails under the applicable standards of review, as
    we just explained.    His theory therefore has no force.   See United
    States v. Sutton, 
    970 F.2d 1001
    , 1008 (1st Cir. 1992) (noting that
    "rare" is the "case in which we should attempt to refigure the
    trial court's assessment of the probative worth/prejudicial impact
    calculus").     And even if he thinks he raised other prejudice
    arguments, we would consider them "waived for lack of development."
    See Cruz-Ramos, 987 F.3d at 35 n.5; see also Págan-Lisboa v. Soc.
    Sec. Admin., 
    996 F.3d 1
    , 7 (1st Cir. 2021) (finding any supposed
    arguments "too skeletal or confusingly constructed[,] and thus
    waived" (quotation marks omitted)).
    Enough said about the other-acts evidence.
    Codefendant's Statement
    The defense wanted to impeach an agent who testified at
    trial that Rivera had "the only keys . . . available at the time
    - 18 -
    . . . that opened" the apartment door.    And the defense wanted to
    do the impeaching by using the agent's report, which included a
    codefendant's claim that he (the codefendant) had purchased the
    lock and had a key for it.        The judge, however, sustained the
    government's objection on hearsay grounds.
    The parties spend some time on the hearsay issue.     But
    it is enough for us to note that even if the judge erred in this
    respect (and we are not saying either way), the error was harmless.
    As we wrote in the opening paragraph, constructive possession may
    be joint — it need not be exclusive, i.e., two people can share
    constructive possession over something.    See, e.g., United States
    v. Hicks, 
    575 F.3d 130
    , 139 (1st Cir. 2009); see also United States
    v. Howard, 
    687 F.3d 13
    , 18 (1st Cir. 2012) (emphasizing that
    "[j]oint possession occurs when both the defendant and another
    person share power and intent to exercise dominion and control
    over contraband" (quotation marks omitted)). And as the government
    notes (without any denial from Rivera), the codefendant's comment
    would have shown only that another person besides Rivera had a key
    to the apartment — not that the codefendant had exclusive control
    over the flat.   Which gives us "a high degree of assurance" that
    the judge's ruling made no difference to the verdict.    See United
    States v. Kilmartin, 
    944 F.3d 315
    , 339 (1st Cir. 2019), cert.
    denied, 
    140 S. Ct. 2658
     (2020).    Hence our harmless-error holding.
    - 19 -
    Rivera's Statement
    Rivera next faults the judge for excluding audio from
    part of the apartment-search video that caught him telling an agent
    that a key on his chain was for the car that the police had just
    searched.    Acting on the government's motion in limine, the judge
    — over the defense's objection — ruled the statement inadmissible
    for hearsay reasons (the video came in, but the jurors did not
    hear the statement the defense wanted them to hear).
    Trying to get us to reverse this ruling — he thinks the
    statement supports his the-police-set-me-up theory — Rivera argues
    that the judge had to admit the statement either under the excited-
    utterance    or   the   business-record   hearsay   exceptions.   The
    government disagrees.     But we need not take sides on the parties'
    debate, and for a simple reason.     Even if one key was for the car,
    another key was for the apartment (an agent successfully used a
    key to open the padlock, remember) — which linked him to the
    apartment, meaning he was not some mere bystander but rather a
    constructive possessor of the drugs and the gun given his "control
    over the area where the contraband [was] found." See, e.g., Tanco-
    Baez, 942 F.3d at 25 (quotation marks omitted).        So we think it
    "highly probable" that the judge's decision did not influence the
    trial's outcome.    See Kilmartin, 944 F.3d at 338.    In other words,
    any error — and we do not intimate there was any — would be harmless
    - 20 -
    at worst.    And Rivera gives us no convincing reason that we are
    wrong (e.g., he has not adequately developed an argument that the
    statement's exclusion affected his ability to present his theory
    about how the police brought his gun into the apartment).             See
    United States v. Henderson, 
    911 F.3d 32
    , 37 (1st Cir. 2018)
    (pointing    out   how   the    defendant   had   not   "rebut[ted]   the
    government's" harmless-error argument).
    Police's Work Plan
    The same goes for the judge's decision stopping the
    defense from asking an agent about a work plan her supervisor came
    up with for the search — a decision based principally on hearsay
    grounds, consistent with what the government had argued.
    In Rivera's telling, the work plan "indicated" that the
    police expected two people at the apartment, neither of whom was
    him — which backed up his "defense" that he "was not in control of
    the apartment," or so he argues.      And, he continues, the judge had
    to admit the sought-after evidence either under the business-
    record or the existing-state-of-mind hearsay exceptions.        Unmoved,
    the government says the judge got the hearsay issue exactly right.
    We decline to referee this hearsay fight too (so we can set aside
    the government's concern about whether Rivera did enough below to
    preserve his argument).        Suffice to say, his hoped-for evidence
    would have shown not that he had no control over the apartment but
    - 21 -
    that other people besides him also had control.12               So again, we
    possess the required level of confidence that the jury would in
    all likelihood have found him guilty had the fought-over evidence
    come in, making any error on this score (if error there was)
    harmless.      See 
    id.
    Instructional Issues
    We   turn   now      to   Rivera's   issues    with   the   jury
    instructions.      He first claims that the judge erred by instructing
    the jury that the mental state required for the gun-possession
    charge was "knowingly."         He then claims that the judge erred by
    telling the jury that "the intent element" for aiding-or-abetting
    liability "is satisfied if the defendant had advance knowledge of
    the   facts    that   make   the    principal's    conduct   criminal,"   with
    "'[a]dvance knowledge' mean[ing] knowledge at a time the defendant
    can opt to walk away."        And he finally claims that the judge erred
    by instructing the jury "on actual possession . . . despite no
    evidence of actual possession in the record."           The government, for
    its part, sees nothing amounting to reversible error.
    Standard of Review
    The pined-for evidence also may have potentially shown that
    12
    the police did not know about the evidence establishing Rivera's
    control until the warrant's execution — but even if true, that
    would   be   irrelevant    to   the   jury's    guilt-or-innocence
    determination.
    - 22 -
    Rivera   concedes     that   he   did   not   preserve    these
    challenges below.   So our review is at best limited to plain error.
    Again, a plain error is an error that is indisputable under current
    law that not only affected the defendant's substantial rights but
    also seriously endangers the judiciary's public reputation for
    fairness and integrity.13      See, e.g., United States v. Takesian,
    
    945 F.3d 553
    , 563 (1st Cir. 2019); Rivera-Carrasquillo, 933 F.3d
    at 48 n.14, 55.
    Gun Possession
    We can make quick work of Rivera's lead claim.           The law
    books are full of First Circuit cases holding that knowingly is
    the requisite mental state for possessing a gun in furtherance of
    a drug crime.     See, e.g., United States v. Bobadilla-Pagán, 
    747 F.3d 26
    , 35 (1st Cir. 2014); United States v. Bucci, 
    525 F.3d 116
    ,
    132 (1st Cir. 2008); United States v. Flecha-Maldonado, 
    373 F.3d 170
    , 179 (1st Cir. 2004).       Rivera thinks these cases are wrongly
    decided.    But they "bind[] district courts and, indeed, this
    panel."    See In re TJX Cos. Retail Sec. Breach Litig., 
    564 F.3d 489
    , 501 (1st Cir. 2009).      Which means the disputed gun-possession
    13 The government also argues that Rivera intentionally
    relinquished these arguments below so that he cannot even challenge
    them as plain error. But we assume favorably to him that he did
    not.
    - 23 -
    instruction does not come "within a country mile of plain error."
    See United States v. Morosco, 
    822 F.3d 1
    , 21 (1st Cir. 2016).
    Aiding or Abetting
    Nor does the targeted aiding-and-abetting instruction.
    Consider the first complained-of part — that "the intent element
    . . . is satisfied if the defendant had advance knowledge of the
    facts that make the principal's conduct criminal."     Our caselaw
    says (with "caveats" not at issue here) that "to establish criminal
    liability . . . for aiding and abetting criminal behavior, . . .
    the government need prove beyond a reasonable doubt that the
    putative aider and abettor knew the facts that make the principal's
    conduct criminal."   United States v. Ford, 
    821 F.3d 63
    , 74 (1st
    Cir. 2016).   Now consider the second complained-of part — that
    "'[a]dvance knowledge' means knowledge at a time the defendant can
    opt to walk away."     Supreme Court caselaw indicates that "a
    defendant may be convicted of abetting" a firearms crime like
    Rivera's "only if his intent reaches beyond a simple drug sale, to
    an armed one" — which depends in part on whether he knew that a
    colleague had a gun, in time to "do something with" that knowledge,
    "most notably, opt to walk away."   See Rosemond v. United States,
    
    572 U.S. 65
    , 76, 78 (2014).   The bottom line is that these parts
    jibe with controlling law.    And "[s]o what [Rivera] offers is
    hardly the stuff of plain error."   See Cruz-Ramos, 987 F.3d at 45.
    - 24 -
    Actual Possession
    Rivera's actual-possession complaint, appearing in a
    passing sentence in the brief's summary of argument and then in a
    fleeting sentence in the brief's conclusion, is too inadequately
    developed to be meaningfully addressed.     We thus deem it waived.
    See, e.g., Rodríguez v. Municipality of San Juan, 
    659 F.3d 168
    ,
    175 (1st Cir. 2011); United States v. Zannino, 
    895 F.2d 1
    , 17 (1st
    Cir. 1990).
    Final Words
    For the reasons itemized above, we affirm the judgment
    entered below.
    - 25 -