United States v. Delgado-Marrero , 744 F.3d 167 ( 2014 )


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  •           United States Court of Appeals
    For the First Circuit
    Nos. 11-1660,
    11-1742
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    RAQUEL DELGADO-MARRERO,
    ÁNGEL L. RIVERA-CLAUDIO,
    Defendants, Appellees.
    APPEALS FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF PUERTO RICO
    [Hon. José Antonio Fusté, U.S. District Judge]
    Before
    Torruella, Howard and Thompson,
    Circuit Judges.
    Rafael F. Castro-Lang, for appellant Delgado.
    Linda Backiel, for appellant Rivera.
    Jacqueline D. Novas-Debién, Assistant United States Attorney,
    with whom Rosa Emilia Rodríguez-Vélez, United States Attorney,
    Nelson Pérez-Sosa, Assistant United States Attorney, Chief,
    Appellate Division, and Luke Cass, Assistant United States
    Attorney, were on brief for appellee.
    February 11, 2014
    TORRUELLA, Circuit Judge.           Former San Juan Municipal
    Police    Officers    Raquel   Delgado-Marrero         ("Delgado")       and    Ángel
    Rivera-Claudio ("Rivera") were convicted by a jury on drug and gun
    charges    arising    from   an   FBI    reverse      sting    operation       called
    "Operation    Guard    Shack."      They      each   received      a   fifteen-year
    sentence. On appeal, Delgado and Rivera raise multiple challenges,
    claiming both trial and sentencing errors by the district court.
    They each seek either a new trial or resentencing.
    Our discussion begins with Delgado's contention that the
    district    court     committed    reversible        error    by   excluding      the
    testimony of a defense witness. Because we agree with Delgado that
    the district court erred on this front, and that a new trial is
    needed to mend the error, we do not address any of her other
    appellate challenges.
    With respect to Rivera, we agree that his sentence cannot
    withstand the Supreme Court's decision in Alleyne v. United States,
    
    133 S. Ct. 2151
    (2013).          Applying Alleyne retroactively, we find
    that the district court plainly erred in articulating the jury
    instructions imparted in connection with a post-verdict special
    jury form.     We further find that Rivera's other claims of error
    ultimately fail.
    The necessary details follow, with a recitation of "the
    facts in the light most favorable to the government."                          United
    States v. Flores-Rivera, 
    56 F.3d 319
    , 322 (1st Cir. 1995).
    -2-
    I. Background
    A. Operation Guard Shack
    The FBI launched "Operation Guard Shack" as part of its
    efforts to combat police corruption throughout Puerto Rico.1               As
    relevant here, the FBI hired a Puerto Rico Police officer ("Officer
    I") to pose undercover as a corrupt policeman with close ties to a
    mid-to-high-level     local    drug     dealer.2         Officer   I's   main
    responsibility was to recruit fellow police officers willing to
    provide   armed     security   during       a   staged   "multi-kilo"    drug
    transaction.      The FBI also hired another undercover Puerto Rico
    Police officer, "Officer II," to play the role of the dealer during
    the staged drug transaction.
    Delgado and Rivera were working partners stationed at the
    Antillas Police Precinct in San Juan, Puerto Rico.                 Delgado, a
    1
    According to an official press release issued by the United
    States Justice Department, Operation Guard Shack was "the largest
    police corruption investigation in the history of the FBI," and
    involved "125 undercover drug transactions conducted . . . in
    several locations in Puerto Rico, from July 2008 until September
    2010."   The operation yielded 26 indictments against 89 law
    enforcement officers and 44 other civilians.
    2
    To protect their identities, we omit all references to the names
    of the undercover agents involved in the case.             For his
    participation in Operation Guard Shack, Officer I received $1,400
    monthly, but his contract with the FBI was subject to a six-month
    review and could be terminated at will.        Officer I was also
    provided with "expensive" cars in order to portray the image of a
    corrupt officer who had money to spend. At the time Officer I
    contracted with the FBI, his entire salary from the Puerto Rico
    Police Department was being garnished on account of a child support
    debt.
    -3-
    divorced mother of two, had no prior criminal record.             She began
    her career as a municipal police officer in her late twenties.
    Before her arrest in 2010, Delgado had enjoyed five years of
    experience    on   the   force,   had   never   been   the   subject   of   an
    administrative complaint, and had received the award of "Municipal
    Police Woman of 2009."      For his part, Rivera, who was twenty-four
    years old at the time of his arrest, enjoyed four years of
    experience in the municipal police force and, like Delgado, had
    untarnished criminal and administrative records.
    Officer I reached out to Delgado sometime in the middle
    of 2009 as part of his undercover role as a corrupt policeman.
    Officer I knew Delgado from childhood.            They grew up near each
    other, were middle-school classmates, and had once shared a close-
    knit circle of friends.       After middle school, however, Officer I
    and Delgado went their separate ways and eventually lost touch with
    each other.
    More than a decade later, Officer I identified Delgado as
    a possible target of Operation Guard Shack during a conversation
    with her ex-husband, who had asked to meet with him for an
    unrelated personal matter.3        During the meeting, when Officer I
    asked about Delgado, her ex-husband told him that they were no
    3
    Delgado's ex-husband was also a municipal police officer whom
    Officer I knew from childhood. He met with Officer I to discuss
    drug-related problems in his neighborhood and to ask if more
    patrolling could be provided. The ex-husband's current spouse was
    present during the meeting.
    -4-
    longer   together       and     that    Delgado    had    several   part-time         jobs
    providing nighttime door security at veterinarian clinics as well
    as some pubs.        Delgado's ex-husband also shared with Officer I his
    distaste       for   Delgado's       part-time     jobs,    stating      that    he    was
    concerned that the jobs were in unsafe locations. According to his
    testimony at trial, Officer I understood the ex-husband's concerns
    to    mean   that     Delgado    was    part-timing        in   places   where       drug-
    trafficking activities occurred.
    Officer I asked for Delgado's phone number during a
    second meeting with her ex-husband. Soon thereafter, he called her
    to see whether she was in fact doing part-time jobs at questionable
    locations.           Although     the        FBI   had    instructed      that       phone
    conversations with Operation Guard Shack targets be recorded,4
    Officer I testified at trial that he was unable to record the first
    call with Delgado because he made it while on duty, with fellow
    officers nearby.        Another unrecorded phone call took place shortly
    thereafter; Officer I testified that he could not record that
    conversation because some of his family members were nearby when he
    placed the call.
    Officer I recorded a phone conversation with Delgado for
    the    first    time    on    July     20,    2009.       The   transcript      of    that
    conversation         reflects    that    Officer      I   had   previously       invited
    4
    The FBI provided Officer I with special recording equipment for
    this purpose.
    -5-
    Delgado, and she had agreed, to participate in a drug transaction,
    in which Delgado and an unnamed fellow officer5 would provide
    security in exchange for $2,000 each.6
    Officer I recorded a second call with Delgado on July 23,
    2009.   This time, as depicted in the call's transcript, Officer I
    explained to Delgado that the transaction would take place inside
    a house; that Delgado and the fellow officer's job was simply to
    frisk two people that would come to pick up the "kilos"; that the
    job would begin at 8:00 p.m. and would last thirty minutes to an
    hour; and that Officer I would personally direct Delgado on how to
    get to the house.
    B. The Sham Transaction
    The sham drug transaction took place the next day.   With
    the assistance of Officer I, who provided final minute-by-minute
    directions by phone, Delgado and Rivera arrived at the apartment in
    the municipality of Dorado, Puerto Rico, where the "transaction"
    was to take place.      Officer I and Officer II waited in the
    apartment, where the FBI had placed hidden cameras and microphones
    in order to record the events.7   Also in the apartment was a duffle
    5
    The fellow officer turned out to be Rivera, whom Delgado
    convinced to accompany her during the transaction.
    6
    Neither the word "drug" nor any specific type of drug was
    mentioned during the conversation, but Delgado testified at trial
    that she assumed the transaction involved drugs.
    7
    A crew of FBI agents controlled the hidden equipment and
    monitored the events from an apartment next door.
    -6-
    bag containing the purported drugs underlying the sham transaction
    -- seven packages, or "bricks," that the FBI had prepared to
    resemble one-kilogram blocks of actual cocaine.
    The video recording of the "transaction" begins when
    Delgado and Rivera step into the apartment.     Officer I, Delgado,
    and Rivera enter in full view of a hidden camera that was recording
    the entry door and foyer area of the apartment.   To the left of the
    entry door is a kitchen, and Officer I offers drinks to Delgado and
    Rivera.   Delgado takes a soda and Rivera a beer.    Officer I then
    ushers them into a living room, where Officer II, in his role as a
    drug dealer, sits in the middle of a large L-shaped sectional sofa.
    Another hidden camera captures the moment when Officer I,
    Delgado, and Rivera come into the living room.        Officer I and
    Rivera sit on the sofa where Officer II awaits seated.      Delgado
    asks where the bathroom is and steps out of the camera's range.
    While Delgado is in the bathroom, Officer I and Officer
    II engage Rivera in friendly banter.    Among other things, they ask
    Rivera about the type of gun given to the municipal police. Rivera
    states that he dislikes the old, secondhand gun he was provided,
    and, upon further probing from Officer I, retrieves the gun from
    underneath his jacket, waves it in the air so that the others can
    see it, and tucks it back in.   Officer I and Officer II also show
    Rivera the gun each is carrying.      When Delgado returns from the
    bathroom, the gun-related discussion continues, and she also shows
    -7-
    her official gun, which she was carrying inside her waistband,
    hidden underneath her shirt.      Delgado then sits down on the sofa
    between Rivera and Officer II.
    The friendly banter continues for half an hour, including
    remarks about Delgado's birthday party, which is happening later
    that night.   The   conversation is interrupted when the purported
    drug buyer knocks at the door.8    Immediately, Officer II instructs
    Rivera to open the door and to make sure that nobody enters the
    apartment armed.    Rivera picks up a set of keys from the coffee
    table in front of the sofa and leaves to open the door.    Officer I
    gets up and signals Delgado to follow him in order to assist
    Rivera.   She gets up and follows Officer I out of the living room.
    The hidden camera recording the area of the entry door
    captures Rivera approaching.      He opens the door and orders the
    purported drug buyer to stand still and proceeds to frisk him.9
    Finding no weapons on the newcomer, Rivera walks him to the living
    room.   There, the purported buyer greets Officer II and sits down
    on the sofa, and Officer I and Rivera return to their seats.
    Delgado remains standing and goes in and out of the camera's frame,
    8
    Another undercover agent ("Officer III") plays the part of the
    buyer.
    9
    Although not seen on the video footage provided to us,    another
    hidden camera apparently captured Officer I and Delgado       in the
    hallway watching Rivera frisking the purported drug buyer.   Officer
    I's trial testimony corroborated that they were in the       hallway
    watching Rivera.
    -8-
    but her voice can sometimes be heard as she participates in the
    conversation.
    The friendly banter continues exactly where it left off.
    It is interrupted approximately fifteen minutes later, when the
    purported buyer tells Officer II to bring him the "stuff" because
    he is leaving.    Officer II then casually tells Rivera to call an
    elevator   that   is   apparently    nearby,   while   at    the   same   time
    signaling to him the direction of the elevator he is referring to.
    Rivera gets up from the sofa and walks away from the hidden
    camera's view.    Officer II then tells Rivera, who is still out of
    view but apparently in the living room, to wait for the elevator
    doors to open and to hand what is inside the elevator to the buyer.
    A few seconds later, Rivera comes back carrying a duffle bag.               He
    hands it to the buyer, and sits down on the sofa next to him.
    Though the coffee table in front of the sofa blocks the
    camera's view, it appears that the purported buyer places the bag
    on the floor, between his legs, and opens it.                  He takes two
    packages out of the bag and stacks them on top of the coffee table.
    He does the same with two additional packages.              He next seems to
    fiddle with something in the bag.          Rivera remains seated to the
    right of the buyer.     Delgado is still standing and does not appear
    in the video at this moment.        One of Delgado's hands, which holds
    a cellular phone, comes into the camera's frame briefly a few
    -9-
    times.    Her voice can also be heard during the conversation, so it
    is safe to conclude that she remains somewhere in the living room.
    The jovial atmosphere continues.   Approximately a minute
    after placing the four packages on the coffee table, the purported
    buyer places them back into the duffle bag, closes it, stands up,
    places the carrying strap of the bag on his left shoulder, shakes
    hands with everyone, and walks to the entry door escorted by
    Rivera.    Delgado stays in the living room chatting with Officer I
    and Officer II.   When Rivera returns, Delgado goes to the bathroom
    a second time.
    A new round of banter begins with Rivera, Officer I, and
    Officer II sitting around the sofa.      Delgado joins in when she
    returns from the bathroom, though her attention often centers on
    her cellular phone, as she appears to be exchanging text messages
    with someone.     A few minutes into the conversation, Officer II
    instructs Officer I to go get the "guys' stuff."     Officer I walks
    out of the living room, away from the hidden camera's view.       He
    appears back in the video a minute later holding two beers in his
    left hand and a stack of money in his right.       He places the two
    beers on the coffee table in front of Rivera and Delgado, then sits
    down on the sofa to the left of Officer II.        Between jokes and
    laughter, Officer I counts the money, eventually handing $1,000 in
    $20 bills to Rivera.      Rivera counts the money given to him.
    Officer I and Rivera follow the same routine until $4,000 in cash
    -10-
    exchanges hands.    Upon Officer II's inquiry, Delgado and Rivera
    state that they are available to do a second job later on.
    They are still on the sofa, jovially chatting with
    Officer I and Officer II, when the video recording from the camera
    in the living room cuts off.   The video recording from the hidden
    camera in the entry area cuts off around the same time.   One hour
    and a few minutes have lapsed since Delgado and Rivera stepped into
    the apartment.
    C. The Arrest and Trial
    The FBI arrested Delgado and Rivera on October 6, 2010,
    pursuant to a four-count indictment.       Count One alleged that
    Delgado and Rivera knowingly and intentionally conspired to possess
    with intent to distribute five kilograms or more of a substance
    containing a detectable amount of cocaine, in violation of 21
    U.S.C. §§ 841 and 846.    Count Two charged that Delgado and Rivera
    aided and abetted each other in an attempt to possess with intent
    to distribute five kilograms or more of a substance containing a
    detectable amount of cocaine, in violation of §§ 841 and 846, and
    18 U.S.C. § 2.     Counts Three and Four alleged that Delgado and
    Rivera, respectively, knowingly possessed a firearm in furtherance
    of the drug trafficking crimes charged in Counts One and Two, in
    violation of 18 U.S.C. § 924(c)(1)(A).
    At trial, the government presented three witnesses:
    Officer I, Officer II, and the FBI special agent (the "Special
    -11-
    Agent") who prepared the apartment and the duffle bag for the
    transaction. It also introduced into evidence (1) the two recorded
    phone calls between Officer I and Delgado; (2) the video recording
    of the transaction; and (3) five pictures of the duffle bag
    containing the "bricks" before the FBI placed it in the Dorado
    apartment. The government's theory was that the video recording of
    the transaction spoke for itself and showed guilt beyond reasonable
    doubt on all counts.
    In her defense, Delgado argued entrapment. She presented
    her own testimony and the testimony of her ex-husband.        In support
    of her entrapment defense, Delgado testified that for approximately
    one month, she rejected Officer I's persistent invitations of part-
    time employment; that during this period, Officer I called her
    repeatedly and sometimes took her out on dates; that she had
    romantic, sexual affairs with Officer I in 2005 and 2009; that
    weeks after the transaction, Officer I took her out on a date
    during which they had sexual intercourse; and that Officer I preyed
    on   their   long-lasting   friendship   and   trust   to   overcome   her
    expressed and firm resistence to participate in the transaction.
    Despite this reluctance, Delgado testified that she
    finally gave into Officer I's insistent pressure.            She further
    explained that she contacted her partner, Rivera, and that they
    "decided to go to the place" where the part-time job organized by
    Officer I was to be held.     She stated that, following directions
    -12-
    from Officer I, she asked for $2,000 each -- for herself and Rivera
    -- in exchange for their roles in the deal; that Rivera drove her
    to the apartment depicted in the video; and that the two partners
    entered the apartment together with Officer I.              She admitted that
    she was aware that the "bricks" involved in the transaction were
    narcotics    and   that   she    was    doing   something    wrong,   but   she
    maintained that she only participated in the transaction because of
    Officer I's insistence, because of the "sentimental or romantic
    relationship" she had with him, and because of her trust in him.
    In further support of her entrapment defense, Delgado
    sought to present the testimony of Brenda Rosa-Valentín ("Rosa-
    Valentín"), the younger sister of a fellow policeman Officer I grew
    up with and considered a dear friend.           But on an objection by the
    government, the court decided to hear her testimony outside the
    presence    of   the   jury,    and    ultimately   ruled    it   inadmissable
    extrinsic evidence under Fed. R. Evid. 608(b).
    Rivera neither took the stand nor presented any witnesses
    in his defense.10 During opening statements,11 Rivera's counsel told
    the jury that he intended to show that Rivera "was not guilty of
    conspiracy as charged in the Indictment," and that Rivera had no
    intention of participating in the transaction before Officer I
    10
    Rivera and Delgado each had their own counsel.
    11
    The defendants' opening statements were deferred until the
    beginning of their case-in-chief.
    -13-
    lured Delgado into it. Although the record shows that counsel told
    the court that he intended to present a derivative entrapment
    defense, the court ultimately did not allow the defense.12
    After a three-day trial, the jury found Delgado and
    Rivera    guilty   on   all   counts.          They   were   each   sentenced    to
    concurrent terms of ten years on Counts One and Two, corresponding
    to the statutory minimum under 21 U.S.C. § 841(b)(1)(A) for
    possession with intent to distribute five kilograms or more of
    cocaine.     On Counts Three and Four, respectively, Delgado and
    Rivera each received a five-year sentence for possession of a
    firearm    in   relation      to    a   drug    trafficking     crime,   to     run
    consecutively with their ten-year sentences under Counts One and
    Two, for total terms of imprisonment of fifteen years each.                   This
    consolidated appeal timely ensued.
    II. Discussion
    A. Delgado's Evidentiary Challenge
    As relevant here, Delgado argues that the district court
    committed reversible error in excluding Rosa-Valentín's testimony,
    which "prevented [her] from presenting important evidence that
    12
    For a discussion of the derivative entrapment defense, see
    United States v. Washington, 
    106 F.3d 983
    , 992-96 (D.C. Cir. 1997)
    (cited by United States v. Luisi, 
    482 F.3d 43
    , 52-58 (1st Cir.
    2007) (discussing third-party entrapment, and distinguishing
    derivative entrapment from vicarious entrapment)).      On appeal,
    Rivera does not challenge the district court's determination that
    the derivative entrapment defense was unavailable to him. In his
    appellate brief, Rivera states that his "only defense" at trial was
    the "right to the presumption of innocence."
    -14-
    [would have] aided . . . in establishing her only defense, that she
    was entrapped by [Officer I] in participating in the offense
    conduct."      We agree.
    1. Background
    When the defense examined Officer I, the government
    objected,      on   relevancy       grounds,    to   a   question    regarding   his
    recollection of prior interactions with Rosa-Valentín. At sidebar,
    Delgado's counsel proffered that Rosa-Valentín, who was one of
    Delgado's witnesses, would testify that Officer I had offered her
    money in exchange for providing contact information of policemen to
    entrap.        Rosa-Valentín would also testify that Officer I had
    confessed to her his desire to kill a man he thought had wronged
    her brother.13      Following the proffer, the court stated: "Well, I
    will not allow you to ask [about] that unless I first hear that
    from [Rosa-Valentín]. . . .            Because I think this is too much of a
    stretch.    If you give me . . . some foundation evidence that he has
    done that, I will allow you to [recall Officer I]."
    When the interrogation resumed, Officer I admitted that
    he had offered money to Rosa-Valentín in exchange for police
    officers' names.         When asked about the timing of his proposal,
    Officer    I    said   that    he    first     mentioned   it   to   Rosa-Valentín
    indirectly during a chance encounter with her while on duty
    13
    Apparently, the wife of Rosa-Valentín's brother committed
    suicide in the middle of an extramarital affair with the man whom
    Officer I allegedly said that he wanted to kill.
    -15-
    patrolling his sector.   In this regard, Officer I testified that,
    in responding to a late-night complaint about noise and loud music,
    he arrived at a commercial establishment where a birthday party
    appeared to be taking place.    The party turned out to be Rosa-
    Valentín's.   As Officer I recounted: "[W]hen the person that came
    out to explain why the music was so loud turned out to be her, I
    greeted everybody and then I continued patrolling.   I explained to
    her that they needed to lower the music down, and . . . they told
    me that they were just about to close."    Officer I denied having
    any beers or allowing the party to continue after 2:00 a.m. in
    contravention of a municipal ordinance.   He also denied going to
    Rosa-Valentín's house looking for her more than fifteen times after
    the birthday party.
    As proffered, Delgado called Rosa-Valentín to the witness
    stand as part of her case-in-chief.    The government immediately
    objected, arguing that the testimony was irrelevant.   At sidebar,
    defense counsel repeated the proffer previously given about Rosa-
    Valentín's testimony, and the court stated that it would have "to
    hear the evidence outside of the presence of the jury . . . to see
    if it's relevant."
    Outside the presence of the jury, Rosa-Valentín stated
    that Officer I was her brother's lifelong friend and that she had
    -16-
    known him for approximately thirty-three to thirty-four years.14
    She also stated that, during the funeral services for her sister-
    in-law, Officer I told her twice that he wanted to kill the man
    involved in the extramarital affair that allegedly caused the
    suicide.
    Rosa-Valentín further testified that Officer I "used to
    tell [her] when he came home all the things that he used to do."
    Specifically, she testified that Officer I mentioned to her that he
    would go to a drug point in his patrolling sector, arrest a seller,
    "and [he] would tell the guy to call his boss. . . .     [W]henever
    they got in touch with the drug dealer, [he] would tell him that in
    order to release his runner, he was going to have to give him
    something in return, either weapons, drugs, or money."   Similarly,
    Rosa-Valentín testified that Officer I told her of other instances
    in which he would fabricate cases and arrest people to ask "for
    either drugs, weapons, or money, and he told [her] that he would
    always ask for weapons."
    Rosa-Valentín next gave her version of the interactions
    she had with Officer I on the day of her birthday.     According to
    her testimony, after greeting Officer I that night, he told her
    14
    Rosa-Valentín worked as a restaurant waitress at the time of her
    testimony. She was asked whether she had a romantic relationship
    with Officer I. She answered: "No, never."      She was also asked
    about the extent of her relationship with Delgado, and she said
    that Delgado "was a friend of her brother" but that Delgado and she
    did not "have a relationship as friends."
    -17-
    that "he was [on duty] in a [nearby] park so he could spend some
    time with us at the [party]."     While at the party, she said that
    Officer I had around eight or nine beers.   She stated that, at some
    point, a police sergeant drove by the party, but that the party was
    allowed to continue until 4:30 a.m. after Officer I spoke to the
    sergeant.    Officer I left the party at around 1:30 or 2:00 a.m.,
    but came back later.    After the establishment where the party was
    being held had closed, Rosa-Valentín's guests (including Officer I)
    went to her house and continued the gathering until 6:00 a.m.
    Before the party was over, Officer I mentioned to Rosa-Valentín
    that he would come back the next day because he needed to talk to
    her.
    According to Rosa-Valentín's testimony, Officer I came to
    her house the next day.   Her account of that visit was as follows:
    He came in [driving] the patrol car, like he
    always did, wearing his uniform. . . .     He
    asked me if I could get some police officers
    for him . . . . He asked me if I could get
    some for him to do some part-time work, and I
    told him I would check, because I have a
    friend who already had part-time jobs. They
    worked at gas stations, that kind of thing.
    Again, he emphasized whether I had the phone
    number, whether I had it in a safe place. I
    said I did. And he told me that if anything
    came up, that I should call him, that he was
    offering me $5,000 for every cop that I
    brought to him.
    Rosa-Valentín also stated that Officer I persistently followed up
    on his inquiry: "during the day he would come three, four, five,
    six, seven times . . . then at night he would come in a patrol
    -18-
    car." Officer I kept this routine up for four months, beginning in
    February and ending in mid-June.
    Lastly, Rosa-Valentín testified that, when she refused to
    provide any information to Officer I, he invited her to do part-
    time work herself.     She said that, when she asked what the part-
    time work would be, Officer I told her to go to an apartment in the
    municipality of Guaynabo, "and [that] he would talk to [her] over
    there."    Officer I also told her that she could go to the apartment
    with her kids, that there was a pool and a tennis court in the
    complex, and that they would have a good time there.
    After a brief examination by the government, the district
    court found Rosa-Valentín's testimony inadmissible under Fed.        R.
    Evid. 608(b).15      In so ruling, it rejected defense counsel's
    argument    that   Rosa-Valentín's   testimony   directly   contradicted
    portions of Officer I's testimony.       Counsel further argued that
    Rosa-Valentín's testimony was relevant to Delgado's entrapment
    defense.    But the court ruled the entire testimony to be "nothing
    else but an attempt to circumvent Rule 608."
    15
    The defendants argued that the evidence was admissible under
    Rules 404 and 613. The government stated that Rule 404 was
    inapplicable because Officer I was not a defendant, and the court
    agreed. The court sua sponte found Rule 613 inapplicable without
    explaining its reasoning.
    -19-
    2. Applicable Law and Analysis
    We review the district court's evidentiary findings for
    abuse of discretion, United States v. Pelletier, 
    666 F.3d 1
    , 5 (1st
    Cir. 2011), and reverse when, among other reasons, a decision rests
    on an erroneous conclusion of law.       See, e.g., United States v.
    Pires, 
    642 F.3d 1
    , 10 (1st Cir. 2011).    Where, as here, a defendant
    challenges a conviction on account of an evidentiary error, the
    verdict will not be overturned if "it is highly probable that the
    error did not affect the verdict."     United States v. Pridgen, 
    518 F.3d 87
    , 91 (1st Cir. 2008).         Put differently, "even if [an
    evidentiary] error occurred, it would not serve to overturn a
    conviction if it ultimately proved harmless."         United States v.
    Landrón-Class, 
    696 F.3d 62
    , 68 (1st Cir. 2012).          In this case,
    Delgado has demonstrated error, and the government has not met its
    burden of showing that the error was harmless.       See United States
    v. Meises, 
    645 F.3d 5
    , 24 (1st Cir. 2011).
    Our   inquiry   revolves   around   Rule   608(b),   which   in
    pertinent part prohibits the admission of extrinsic evidence "to
    prove specific instances of a witness's conduct in order to attack
    or support the witness's character for truthfulness."           Fed. R.
    Evid. 608(b) (emphasis supplied).        The phrase "character for
    truthfulness" was incorporated into the Rule by amendment in 2003.16
    16
    In pertinent part, the prior rule read as follows: "Specific
    instances of the conduct of a witness, for the purpose of attacking
    or supporting the witness' credibility . . . may not be proved by
    -20-
    The   amendment   sought   to   conform      the    Rule's   language    to    the
    drafters' original intent, which was to exclude extrinsic evidence
    of a witness's general propensity for honesty and truth, rather
    than particular instances of honesty or dishonesty used for other
    non-propensity    purposes.     See    Fed.    R.    Evid.   608(b)     advisory
    committee's note.
    Rule 608(b) was thus amended to do away with the mistaken
    notion that its reach extended to extrinsic evidence offered for
    general impeachment purposes, such as, for example, contradictions,
    prior inconsistent statements, bias, or mental capacity.                      
    Id. After the
    amendment, courts routinely find Rule 608(b) inapplicable
    to general impeachment evidence.              See, e.g., United States v.
    Taylor, 
    426 F. App'x 702
    , 706 (11th Cir. 2011) (per curiam)
    (holding that Rule 608(b) did not bar testimony that contradicted
    defendant's story); United States v. Skelton, 
    514 F.3d 433
    , 441-42
    (5th Cir. 2008) (stating that Rule 608(b) is inapplicable in
    determining the admissibility of evidence introduced to contradict
    a witness's testimony as to a material issue); United States v.
    Magallanez, 
    408 F.3d 672
    , 680-81 (10th Cir. 2005) (holding Rule
    608(b) inapplicable because "the evidence was introduced not to
    'attack' the witness's 'character'" but to demonstrate that a
    statement made during direct examination was false).
    extrinsic evidence."
    -21-
    We examine the excluded testimony against this backdrop.
    As previously stated, Delgado avers that Rosa-Valentín's testimony
    contradicted Officer I's in several respects, and it is clear from
    the record that this was the case.               Officer I, among other things,
    disavowed constantly visiting Rosa-Valentín after her birthday,
    whereas in her proffer she stated that it was precisely thereafter
    that    Officer    I   harassed     her    for    approximately        four   months,
    insisting that he be provided with contact information of police
    officers to do part-time work, sometimes going to her house more
    than seven times per day.               Rule 608(b) does not preclude the
    introduction of this type of impeachment evidence. See 
    Taylor, 426 F. App'x at 706
    ; 
    Skelton, 514 F.3d at 441-42
    ; 
    Magallanez, 408 F.3d at 680-81
    .
    More importantly, however, we agree with Delgado that
    Rosa-Valentín's testimony would have shown how Officer I went about
    his participation in Operation Guard Shack and would thus support
    her entrapment defense.         See United States v. Rizvanovic, 
    572 F.3d 1152
    ,   1155    n.1    (10th    Cir.    2009)    ("Rule     608(b)   does     not   bar
    extrinsic evidence to the extent it goes to substantive issues, and
    here    the    rebuttal     evidence       tended      to   disprove    Defendant's
    affirmative       defense   .   .   .    .");    see    also   United    States      v.
    Montelongo, 
    420 F.3d 1169
    , 1175 (10th Cir. 2005) (finding that Rule
    608(b) does not preclude evidence negating a defendant's guilt).
    -22-
    It is black-letter law that an entrapment defense has two
    elements: "'(1) government inducement of the accused to engage in
    criminal conduct, and (2) the accused's lack of predisposition to
    engage in such conduct.'"    United States v. Sánchez-Berríos, 
    424 F.3d 65
    , 76 (1st Cir. 2005) (quoting United States v. Rodriguez,
    
    858 F.2d 809
    , 812 (1st Cir. 1988)).17      In connection with the
    inducement prong, Rosa-Valentín and Delgado painted a similar
    picture of Officer I's relentless pursuit of Operation Guard Shack
    part-time workers.   Rosa-Valentín testified that Officer I offered
    her large amounts of money and pursued her for four months --
    sometimes going to her house more than seven times a day -- trying
    to win her over so that she would provide contact information for
    part-time employees. In Delgado's case, she testified that Officer
    I courted her almost daily for approximately one month before she
    capitulated.   See United States v. Groll, 
    992 F.2d 755
    , 759 (7th
    17
    A prima facie showing of both elements is needed before a
    district court may instruct the jury to consider the defense.
    United States v. Dávila-Nieves, 
    670 F.3d 1
    , 9 (1st Cir. 2012). In
    this case, the district court found that Delgado satisfied her
    prima facie burden through her testimony, and thus instructed the
    jury to consider her entrapment defense.
    Demarcating the contours of the entrapment defense, the
    Supreme Court has noted that "'[a]rtifice and stratagem may be
    employed to catch those engaged in criminal enterprises.'"
    Jacobson v. United States, 
    503 U.S. 540
    , 548 (1992) (quoting
    Sorrells v. United States, 
    287 U.S. 435
    , 441 (1932)). Nonetheless,
    the Court has cautioned law enforcement officers and prosecutors
    that "[i]n their zeal to enforce the law, however, Government
    agents may not originate a criminal design, implant in an innocent
    person's mind the disposition to commit a criminal act, and then
    induce commission of the crime so that the Government may
    prosecute." 
    Id. -23- Cir.
    1993) (finding that evidence of informant calling defendant on
    a daily basis for over a month requesting marijuana and threatening
    the defendant constituted a colorable entrapment defense).
    Delgado's    and     Rosa-Valentín's       testimonies        similarly
    reflected that Officer I tried to lure them into Operation Guard
    Shack activities by appealing to their long-lasting friendships.
    See United States v. Wright, 
    921 F.2d 42
    , 45 (3d Cir. 1990)
    (explaining that improper inducement by law enforcement may take
    the form of pleas based on sympathy or friendship). But see United
    States v. Ford, 
    918 F.2d 1343
    , 1348-49 (8th Cir. 1990) (finding
    that friendship with a confidential informant is not evidence of
    entrapment).      Delgado's    and   Rosa-Valentín's         testimonies     also
    reflected that Officer I attempted to manipulate his way around
    potential targets' reluctance to participate in an Operation Guard
    Shack "part-time."     As to Rosa-Valentín, Officer I told her to
    bring her children to the "part-time" because there was a pool and
    a tennis court in the apartment where it would take place.
    Concerning Delgado, she said that Officer I romantically seduced
    her until she gave in to his invitations to engage in a "part-
    time."
    Furthermore,    Rosa-Valentín's          testimony    supported       the
    propensity prong of Delgado's entrapment defense.                    For example,
    Rosa-Valentín's    testimony    showed      that   Officer     I's    pursuit    of
    potential Operation Guard Shack targets was not limited to corrupt
    -24-
    officers.      In    this      regard,     she    testified    that      Officer    I
    persistently asked her for contact information of police officers,
    even though she told him she knew only officers seemingly involved
    in legitimate part-time work (her exact words on this were: "They
    worked at gas stations, that kind of thing").                 Rosa-Valentín also
    testified that Officer I invited her to participate in a "part-
    time" herself, despite the fact that she had no criminal record,
    links to the drug-trafficking trade, or involvement with the police
    force.    Delgado testified similarly, stating that her untarnished
    criminal record shows that she had no inclination to engage in
    illegal activities before Officer I's month-long pursuit.                          See
    
    Rodriguez, 858 F.2d at 815-16
    (stating that the absence of a
    criminal record or known links to criminal activity could show the
    accused's lack of predisposition to engage in illegal conduct); see
    also United States v. Gamache, 
    156 F.3d 1
    , 10-11 (1st Cir. 1998)
    (same).
    Notwithstanding the above, the government argues that
    "[t]he     court     correctly     found         [Rosa-Valentín's]        testimony
    inadmissible under Rule 608(b), which only permits inquiry into
    prior    conduct    if   the   conduct     is    probative    of   the    witness's
    character for truthfulness or untruthfulness."                But this argument
    fails for at least two reasons.
    First, the language just quoted from the government's
    brief encompasses the entire extent of its argument before us on
    -25-
    Rule 608(b).      We have stated many times that such a lackadaisical
    effort   is    insufficient    to   carry   the   day.    United   States    v.
    Dellosantos, 
    649 F.3d 109
    , 126 n.18 (1st Cir. 2011); see also
    United States v. Zannino, 
    895 F.2d 1
    , 17 (1st Cir. 1990).
    Second,   Rosa-Valentín's     testimony    fell   out   of   Rule
    608(b)'s reach, inasmuch as it supported Delgado's entrapment
    defense.      See 28 Charles Alan Wright & Victor James Gold, Federal
    Practice and Procedure § 6113, at 47 (2d ed. 2012) ("Rule 608 does
    not grant discretion to admit or exclude evidence for any non-
    character purpose.").       While it may be true that Rosa-Valentín's
    testimony incidentally called into question Officer I's character
    for truthfulness, without more, such an effect does not render the
    testimony inadmissable.        United States v. Abel, 
    469 U.S. 45
    , 56
    (1984) ("[T]here is no rule of evidence which provides that
    testimony admissible for one purpose and inadmissible for another
    purpose is thereby rendered inadmissible; quite the contrary is the
    case.    It would be a strange rule of law which held that relevant,
    competent evidence which tended to show bias on the part of a
    witness was nonetheless inadmissible because it also tended to show
    that the witness was a liar.").
    The government also argues that "the instances mentioned
    by   Rosa-Valentín      were   improper     collateral     impeachment      and
    inadmissible."      See United States v. Cruz-Rodríguez, 
    541 F.3d 19
    ,
    30 (1st Cir. 2008) ("'It is well established that a party may not
    -26-
    present extrinsic evidence to impeach a witness by contradiction on
    a collateral matter.'" (quoting United States v. Beauchamp, 
    986 F.2d 1
    , 3 (1st Cir. 1993))).     But the government's brief contains
    no   explanation   whatsoever   as   to   why   or    how   Rosa-Valentín's
    testimony constituted collateral evidence.            Its argument in this
    regard was perfunctory at best.       In fact, it was limited to the
    introductory remarks just quoted and a few parenthetical citations.
    See 
    Dellosantos, 649 F.3d at 126
    n.18 (stating that perfunctory,
    undeveloped arguments are deemed waived).            All the same, we have
    already established that significant portions of Rosa-Valentín's
    testimony showed how Officer I performed as an Operation Guard
    Shack agent and thus provided support to Delgado's entrapment
    defense.   Accordingly, Rosa-Valentín's testimony was anything but
    collateral.   See 
    Beauchamp, 986 F.2d at 4
    (stating that the term
    "collateral evidence" refers to a matter which in "itself is not
    relevant in the litigation to establish a fact of consequence,
    i.e., not relevant for a purpose other than mere contradiction of
    the in-court testimony of the witness" (internal quotation marks
    omitted)); see also United States v. Williamson, 
    202 F.3d 974
    , 979
    (7th Cir. 2000) ("A matter is collateral if it could not have been
    introduced into evidence for any purpose other than contradiction."
    (internal quotation marks omitted)).
    Lastly, the government attacks the admissibility of Rosa-
    Valentín's proffer under Fed. R. Evid. 404(b)(1).           Rule 404(b)(1)
    -27-
    prohibits the admission of "[e]vidence of a crime, wrong, or other
    act . . . to prove a person's character in order to show that on a
    particular    occasion   the    person   acted   in   accordance   with   the
    character."     According to the government, the Rule applies here
    because "Delgado . . . wanted to [use Rosa-Valentín's testimony] to
    show that because [Officer I] was bad in the past, he must have
    been bad in this case."        In so arguing, the government appears to
    refer to the confessions of corrupt acts Officer I allegedly made
    to Rosa-Valentín. But our prior discussion shows that the scope of
    Rosa-Valentín's proffer went far beyond those admissions.18
    To boot, we disagree with the view that Delgado's stated
    purpose in seeking Rosa-Valentín's testimony masked an effort to
    circumvent Rule 608(b).19       In so ruling, the district court abused
    its discretion by relying on an incorrect interpretation of both
    the relevant facts and the applicable law. Moreover, we agree with
    18
    The government's brief fails to address Delgado's contention
    that Rule 404(b)(1) has a so-called reverse evidence prong that
    permits the admission of Rosa-Valentín's testimony.    Given our
    conclusion here, we need not reach this issue. Nevertheless, we
    note that, in the past, the government itself appears to have
    sanctioned the reverse evidence argument Delgado advances. See
    United States v. Stevens, 
    935 F.2d 1380
    , 1404 (3d Cir. 1991)
    ("[T]he government submits, the defense may introduce evidence
    [under Rule 404(b)] that the government induced others to commit
    crimes in order to show that the defendant was induced to commit
    the charged offense.").
    19
    We recognize that our discussion does not exhaust the myriad of
    possibilities in which the Federal Rules of Evidence could affect
    the admissibility of Rosa-Valentín's testimony at trial.       Our
    analysis is limited, as it must be, to the arguments the parties
    raise on appeal.
    -28-
    Delgado's proposition that Rosa-Valentín's proffered testimony
    would have corroborated pivotal elements of her entrapment defense.
    Because the government does not, and cannot, challenge such a
    proposition, we comfortably find that the government has not met
    its   burden   of   showing   that   "it    is   highly   probable   that   the
    [evidentiary] error did not affect the verdict."            See 
    Pridgen, 518 F.3d at 91
    .     This finding mandates that Delgado's conviction be
    overturned.
    Of course, nothing in this decision should be interpreted
    as an intimation on our part as to the merits of Delgado's
    entrapment defense.     All that we decide today is that the district
    court erred when precluding Rosa-Valentín from testifying as part
    of Delgado's defense. Delgado cannot properly be convicted without
    having the opportunity to present to the jury admissible, material,
    and favorable testimony bearing on her defense.
    B. Rivera's Challenge to the Special Jury Verdict Instructions
    We now turn to the first of Rivera's several claims on
    appeal.   Among other things, Rivera argues that the district court
    failed to properly instruct the jury that in answering a post-
    verdict "special" question regarding drug quantity, they needed to
    be sure of the quantity beyond a reasonable doubt.             We agree.
    1. Background
    At sidebar, before the jury was sent to deliberate,
    Delgado's counsel asked the court to inform the jury that "the
    -29-
    amount and the type of drugs would be determined by the jury."                  The
    court emphatically refused. It retorted: "No, no, no, no, no. Not
    this case.    We know it's seven kilos.          I'm sorry. . . .     It's seven
    kilos.      We counted them on the video.             There's nothing to be
    determined."20      The initial jury instructions and verdict form thus
    left   no   role    for   the    jury   with    respect   to   determining      drug
    quantity.     In fact, at that juncture, the court made no reference
    to quantity, explaining to the jury that the conspiracy count only
    had two elements:
    For you to find a defendant guilty of
    conspiracy, you must be convinced that the
    Government has proven each of the following
    things beyond a reasonable doubt. First, that
    the agreement specified in the indictment and
    not some other agreement existed at least
    between two people to commit that crime. . . .
    Second, that each of the defendants willfully
    joined in that agreement.
    No one objected, and the jury returned a guilty verdict on all
    counts.
    The court then stated in open court that it would dismiss
    the jury unless the parties had any other motions.                The government
    took the opportunity to request "a special jury [verdict] on the
    amount of narcotics involved in this case."                 The court initially
    refused, reasoning that photos of record showed the duffle bag
    containing    the    seven      packages   of   purported      cocaine.   But   the
    20
    The video itself does not support the court's remarks. It shows
    only the four "bricks" the purported buyer placed on top of the
    coffee table.
    -30-
    prosecution insisted that the quantity issue was for the jury to
    determine beyond a reasonable doubt.   Delgado's counsel initially
    resisted, stating that "[t]he verdict ha[d] been rendered."   But,
    after a short colloquy with the government and the court, counsel
    agreed that the question was proper.     The court acquiesced and
    immediately addressed the jury: "Members of the jury, the court has
    decided to ask you an additional question.   Let me prepare a short
    question for you to answer.   You have to go back and answer only
    this question. It's like another deliberation under the same terms
    and conditions."21
    The court instructed the jury thereafter: "I want you to
    determine, answer an additional question that's going to be typed
    out, how much narcotics were involved in this case.   Two choices,
    less than five kilograms of purported cocaine or more than five
    kilograms of purported cocaine." There were no trial objections to
    these jury instructions.
    After a nineteen-minute deliberation, the jury returned
    21
    Before submitting the special verdict form to the jury, the
    court asked the parties to comment on the following proposed jury
    question: "how much narcotics were involved in this case, less than
    five kilograms of purported cocaine[;] more than five kilograms of
    purported cocaine." Rivera's counsel objected on the basis that
    the record contained no evidence about the weight or amount of the
    purported drugs. But the court discarded the objection and sternly
    remarked: "Counsel, listen to me.      Listen to me.     That is a
    sentencing issue, not to be discussed today."
    -31-
    a verdict of "more than five kilograms of purported cocaine."22
    2. Applicable Law and Analysis
    a. Alleyne Error Regarding the Jury Instructions
    Generally, we review challenges to the propriety of jury
    instructions de novo.      United States v. Whitney, 
    524 F.3d 134
    , 138
    (1st Cir. 2008).        However, where, as here, a defendant fails to
    properly preserve an objection at trial, we review the record under
    the plain-error standard.        United States v. Medina-Martinez, 
    396 F.3d 1
    , 8 (1st Cir. 2005); see also United States v. Cotton, 
    535 U.S. 625
    ,    631-34   (2002)   (applying   plain-error   review   to   an
    unpreserved Apprendi error); United States v. Harakaly, 
    734 F.3d 88
    , 94 (1st Cir. 2013) ("This court reviews unpreserved Apprendi
    errors for plain error and preserved Apprendi errors for harmless
    error. Since Alleyne is an extension of the Apprendi doctrine, the
    same standards should apply to Alleyne errors." (internal citation
    omitted)).23
    22
    Consistent with the district court's instruction, the form given
    to the jury was titled, "Special Verdict," and included the
    question "[h]ow much narcotics were involved in this case." Two
    options were given: "less than 5 kilograms of purported cocaine,"
    or "more than 5 kilograms of purported cocaine." The jury returned
    the form with an "x" marked beside the latter option.
    23
    Although an Apprendi issue -- namely, that drug quantity should
    be determined by the jury and not the judge -- was raised at trial
    by Delgado's counsel as well as by the government (prompting the
    court to require the jury to answer the special verdict question),
    Rivera concedes that he did not raise the instructional issue at
    trial. Rivera did in fact object to the special verdict question,
    but only on the basis of the lack of evidence as to the weight or
    amount of the purported cocaine.     There was no trial objection
    -32-
    The plain-error standard requires an initial showing of
    three elements: (1) that an error occurred; (2) that the error was
    clear or obvious; and (3) that the error affected substantial
    rights   or    the   outcome   of   the   case.   See   United   States   v.
    Sánchez-Maldonado, 
    737 F.3d 826
    , 828 (1st Cir. 2013); United States
    v. Rodriguez, 
    675 F.3d 48
    , 64 (1st Cir. 2012); 
    Whitney, 524 F.3d at 140
    (citing United States v. Olano, 
    507 U.S. 725
    , 732-34 (1993)).
    Even if those requirements are satisfied, however, we have the
    discretion to affirm the ruling if "'the error does not distort the
    fairness or integrity of the lower court proceedings in some
    extreme way.'" 
    Rodriguez, 675 F.3d at 64
    (quoting United States v.
    Kinsella, 
    622 F.3d 75
    , 83 (1st Cir. 2010)).             "This multi-factor
    analysis makes the road to success under the plain error standard
    rather steep; hence, reversal constitutes a remedy that is granted
    sparingly."      United States v. Gelin, 
    712 F.3d 612
    , 620 (1st Cir.
    2013).   This appeal, however, falls within the realm of those
    infrequent cases in which reversal is warranted.
    As stated above, Rivera premises his challenge on the
    district court's failure to instruct the jury that the government
    needed to prove drug quantity beyond a reasonable doubt. The
    reasonable-doubt standard, stemming from the Fifth Amendment’s Due
    regarding the burden of persuasion and the failure to instruct the
    jury that drug quantity needed to be determined beyond a reasonable
    doubt. Accordingly, Rivera concedes in his supplemental brief that
    the plain-error standard applies to the Alleyne issue concerning
    the jury instructions.
    -33-
    Process Clause, is interwoven with the Sixth Amendment’s promise of
    a jury verdict.       See Sullivan v. Louisiana, 
    508 U.S. 275
    , 278
    (1993) ("It would not satisfy the Sixth Amendment to have a jury
    determine that the defendant is probably guilty, and then leave it
    up to the judge to determine . . . whether he is guilty beyond a
    reasonable doubt.").      It is therefore well settled that, in a
    criminal case, a vital part of a judge's responsibilities is to
    provide the "reasonable doubt" charge to the jury.           See Dunn v.
    Perrin, 
    570 F.2d 21
    , 25 (1st Cir. 1978) (citing In re Winship, 
    397 U.S. 358
    , 364 (1970)).        Indeed, where a trial judge fails to
    instruct the jury that all the elements of the charged crime must
    be proven beyond a reasonable doubt, a finding of reversible plain
    error may be proper.    See United States v. Hellman, 
    560 F.2d 1235
    ,
    1236 (5th Cir. 1977); United States v. Howard, 
    506 F.2d 1131
    , 1133-
    34 (2d Cir. 1974).
    Prior to the Supreme Court's decision in Apprendi v. New
    Jersey, 
    530 U.S. 466
    (2000), this court did not consider "drug
    quantity" to be an element of the offense for purposes of the
    penalties prescribed in 21 U.S.C. § 841(b)(1).         See, e.g., United
    States v. Eirby, 
    262 F.3d 31
    , 36 (1st Cir. 2001).          Rather, "drug
    quantity" was considered to be a "sentencing factor" that the
    sentencing    judge   could   determine   by   a   preponderance   of   the
    evidence. See 
    id. (explaining that
    pre-Apprendi, the specific drug
    quantities in § 841(b)(1)'s penalty scheme did not have to be
    -34-
    charged in the indictment or found by the jury).
    In Apprendi, the Supreme Court held that "[o]ther than
    the fact of a prior conviction, any fact that increases the penalty
    for a crime beyond the prescribed statutory maximum must be
    submitted to a jury, and proved beyond a reasonable 
    doubt." 530 U.S. at 490
    .   Two years later, in Harris v. United States, 
    536 U.S. 545
    (2002), the Supreme Court declined to extend the Apprendi rule
    to facts that increase only the mandatory minimum sentence.     See
    
    id. at 565-69.
    While this appeal was pending, however, the Supreme
    Court expressly overruled Harris in Alleyne, holding that any fact
    that increases the mandatory minimum is an element that must be
    submitted to the jury and proved beyond a reasonable doubt.     See
    
    Alleyne, 133 S. Ct. at 2155
    , 2162-63.24      Here, Alleyne applies
    retroactively to Rivera's claims on appeal.        See Griffith v.
    Kentucky, 
    479 U.S. 314
    , 328 (1987) ("[A] new rule for the conduct
    of criminal prosecutions is to be applied retroactively to all
    cases . . . pending on direct review or not yet final . . . .");
    Pena, 
    2014 WL 448439
    , at *6 ("The Alleyne rule applies to cases
    pending on direct appeal at the time it was decided."); United
    States v. Doe, No. 12-2304, 
    2013 WL 6697824
    , at *12 (1st Cir. Dec.
    20, 2013) ("As Alleyne was decided during the pendency of [the
    defendant's] appeal, we apply it here."); 
    Harakaly, 734 F.3d at 94
    24
    We examine the development of the Supreme Court's jurisprudence
    from Apprendi to Alleyne in more detail in United States v. Pena,
    No. 12-2289, 
    2014 WL 448439
    , at *4-*6 (1st Cir. Feb. 5, 2014).
    -35-
    n.4 (same).
    On Counts One and Two, Rivera was convicted of conspiring
    and attempting to possess cocaine with the intent to distribute it.
    See 21 U.S.C. §§ 841(a)(1), 846.              Section 841 prohibits, among
    other things, possession with intent to distribute a controlled
    substance.    
    Id. § 841(a)(1).
           In   § 841, subsection (b) prescribes
    the penalties for violations of subsection (a). 
    Id. § 841(a)-(b).
    For possession with intent to distribute cocaine, paragraph §
    841(b)(1)    sets    out   three     different    ranges   of    prison    terms,
    depending on the quantity of cocaine involved. 
    Id. § 841(b)(1)(A)-
    (C).
    For an indeterminate quantity of cocaine, there is no
    mandatory minimum term of imprisonment, and the maximum term is
    twenty years.       
    Id. § 841(b)(1)(C).
          If the violation involves 500
    grams or more of a substance containing cocaine, the permissible
    prison terms range from a minimum of five years to a maximum of
    forty years.     
    Id. § 841(b)(1)(B).
             If the violation of § 841(a)
    involves five kilograms or more of a substance containing cocaine,
    as charged in the indictment here, then the highest statutory range
    of   sentences      applies:   the    mandatory    minimum      is   ten   years'
    imprisonment, and the maximum term is life in prison.                      
    Id. § 841(b)(1)(A).
    Under Alleyne, then, the "drug quantity" question in this
    case -- whether the offense involved at least five kilograms of a
    -36-
    substance containing cocaine -- aggravated the statutory sentencing
    range, and was thus an element of the aggravated crime that was
    required to be determined by the jury beyond a reasonable doubt.
    See   Alleyne,   133   S.   Ct.    at   2161   ("A   fact   that   increases   a
    sentencing floor, thus, forms an essential ingredient of the
    offense . . . .        [T]he core crime and the fact triggering the
    mandatory minimum sentence together constitute a new, aggravated
    crime, each element of which must be submitted to the jury.").
    In this case, the jury determined that more than five
    kilograms of cocaine were involved, triggering the aggravated
    sentencing range (ten years to life) under subparagraph (A).               See
    21 U.S.C. § 841(b)(1)(A).          Based on this finding, the district
    court sentenced Rivera to the mandatory minimum of ten years'
    imprisonment.     See 
    id. Although the
    jury returned a special
    verdict form indicating their finding that "more than 5 kilograms
    of purported cocaine" were involved in the case, however, the trial
    judge failed to instruct the jury that they were required to make
    this special finding beyond a reasonable doubt.             Nor can we assume
    that the jury likely made such an inference, given that they were
    never instructed that "drug quantity" was an element of any of the
    offenses of conviction.
    Nevertheless, the government argues that the special jury
    verdict and its accompanying instructions cured the instructional
    defect.   Specifically, the government posits that the initial jury
    -37-
    instructions unequivocally established the government's duty to
    prove each element of the underlying offense beyond a reasonable
    doubt.   The government thus reasons that "the district court's
    [post-verdict special] instruction that deliberation would be under
    the same 'terms and conditions' also called on the jury to accord
    drug quantity the same treatment as the other elements of the
    offense, . . . which comported with Alleyne."       This argument is
    flawed for at least two reasons.
    First, it presumes that the jurors understood that the
    court posed the special question because "drug quantity" was an
    element of the underlying crime.       Nothing in the record supports
    that   presumption.   The   instructions   accompanying   the   special
    question were tersely given, with the court only stating that the
    jury would be asked to answer another question.     The court neither
    explained why the special question was being asked nor how the
    jury's answer would bear in the case.      Moreover, the special jury
    verdict form was submitted to the jurors after they had: (1)
    deliberated pursuant to the initial jury instruction; (2) rendered
    a guilty verdict; and (3) been told by the court that they were
    about to be dismissed. Having discharged their duties as initially
    explained by the court, and without the benefit of any guidance as
    to the reasons for or relevance of the new question being asked,
    the jurors had no cause to understand the special verdict question
    as involving another element of the offense.
    -38-
    Indeed, given the timing and manner in which the question
    was   presented,        the    jurors     understandably     may   have   failed   to
    appreciate that the additional question represented something more
    than an inconsequential afterthought standing in the way of heading
    home.     With nothing to discredit the reasonable inference that the
    jury placed little weight on the "special" question, we cannot find
    that they were sufficiently put on notice of its critical import to
    the case.      Cf. United States v. DeMasi, 
    40 F.3d 1306
    , 1317 (1st
    Cir. 1994) (framing the dispositive inquiry in a challenge to a
    district court's "beyond reasonable doubt" charge as "whether there
    is    a   reasonable          likelihood     that   the    jury    understood      the
    instructions to allow [a] conviction based on proof insufficient to
    meet the [beyond-a-reasonable-doubt] standard" (internal quotation
    marks omitted)).
    Second, the government's argument places undue weight on
    the   phrase      "under      the    same   terms   and    conditions."     In     the
    government's view, this phrase properly conveyed to the jury that
    its post-verdict deliberation required a determination that the
    government had proven drug quantity beyond a reasonable doubt. The
    government, however, fails to articulate how such a broad phrase
    conveyed such a specific message.
    To    be   sure,       the   initial   jury   instructions    properly
    conveyed to the jury that it needed to find all the elements of the
    underlying crime beyond a reasonable doubt.                 But, as stated above,
    -39-
    and consistent with the Supreme Court precedent applicable at the
    time of trial, no one told the jury that "drug quantity" was an
    element of the crime.         Indeed, even the government's appellate
    attorneys insist in their brief that "[d]rug quantity was not an
    element of the offense here."            Yet the government argues, in the
    same breath, that the jury would have necessarily understood that
    the special verdict question was required to be determined beyond
    a reasonable doubt, based on the interplay of two instructions: (1)
    the initial instruction that the jury must find the defendants
    guilty beyond a reasonable doubt for "any essential element of a
    crime charged," and (2) the subsequent instruction that the special
    verdict question was "like another deliberation under the same
    terms and conditions."        To accept such an inconsistent argument
    would strain credulity.
    Similarly, the district court judge -- after giving the
    instructions at issue, and immediately after the jury left the
    courtroom to consider the special verdict question -- stated to
    counsel that: "I can understand the Apprendi concerns . . . but in
    a case like this one . . . I don't think you need a special
    verdict.      I'm doing it for the simple purpose of pleasing you, if
    you will.      I don't think you need that at all."         If the district
    judge himself -- consistent with the then-governing case law -- did
    not believe that "drug quantity" was an element required to be
    proved   to    the   jury   beyond   a    reasonable   doubt,   and   did   not
    -40-
    explicitly instruct the jury otherwise, then we cannot presume that
    the jury made this inferential leap on its own initiative.
    The initial jury instructions involved many different
    "terms    and   conditions,"    spanning   twenty     pages     of    the   trial
    transcript.     The government has failed to identify a single record
    entry that would allow us to properly link the phrase "under the
    same terms and conditions" back to the beyond-a-reasonable-doubt
    standard explained to the jury in the initial instructions.                 Such
    imprecise   language   was     insufficient   to    do    the   heavy   lifting
    necessary to protect Rivera's Sixth Amendment right.
    The government relies on United States v. Avilés-Colón,
    
    536 F.3d 1
    (1st Cir. 2008), and United States v. Pérez-Ruiz, 
    353 F.3d 1
    (1st Cir. 2003), for the proposition that a verdict form
    need not explicitly state that the beyond-a-reasonable-doubt-
    standard governs the verdict, if the jury instructions sufficiently
    conveyed the same information. This reliance is misplaced. On the
    contrary, both cases weigh heavily against the government.
    In Avilés-Colón, we rejected the proposition that a
    verdict   form   needed   to    explicitly    state      that   the   beyond-a-
    reasonable-doubt standard would govern the jury's deliberations,
    when the jury instructions at issue were "suitably focused" and
    properly "conveyed the need to make the finding with that level of
    
    certainty." 536 F.3d at 27
    .           Unlike this case, however, the
    instruction in Avilés-Colón adequately framed "drug quantity" as an
    -41-
    essential element of the case and made the necessary linkage with
    the   reasonable-doubt    standard.         The     relevant     portion   of    the
    instruction speaks for itself:
    For you to find the defendant guilty of this
    crime, you must be convinced that the
    Government has proved each of the following
    beyond a reasonable doubt: . . . fourth, that
    the quantity of the substance was at least one
    kilogram or more of heroin, five kilograms or
    more of cocaine, and a detectable amount of
    marijuana.
    
    Id. at 26
    n.20.
    Pérez-Ruiz provides no better help for the government, as
    it also makes plain that jury instructions must provide a clear
    linkage between the beyond-a-reasonable-doubt standard and the
    proof that must be marshaled in connection with the elements of the
    crime.     See 
    Pérez-Ruiz, 353 F.3d at 16
    , 19-20 (vacating the
    appellant's sentence, in the context of an enhanced sentencing
    range    for   a   particular     quantity     of       drugs,   when   the     jury
    instructions failed to "forge the necessary link" between the "drug
    types    and   quantities"      alleged   in      the     indictment    and     "the
    requirement that these facts be proven beyond a reasonable doubt").
    The instructional error in this case, moreover, is not
    mitigated by the fact that Rivera's ten-year sentence happened to
    also fall within the statutory range (zero to twenty years of
    imprisonment) for an indeterminate quantity of cocaine.                          See
    
    Alleyne, 133 S. Ct. at 2162
    (reasoning that when a fact "aggravates
    the legally prescribed range of allowable sentences, it constitutes
    -42-
    an element of a separate, aggravated offense that must be found by
    the jury, regardless of what sentence the defendant might have
    received if a different range had been applicable").    The Alleyne
    Court emphasized that whether a defendant could have received the
    same sentence without the aggravating fact "is no answer" and "is
    beside the point."      See 
    id. ("Indeed, if
    a judge were to find a
    fact that increased the statutory maximum sentence, such a finding
    would violate the Sixth Amendment, even if the defendant ultimately
    received a sentence falling within the original sentencing range
    (i.e., the range applicable without that aggravating fact).").
    Under these circumstances, reversal is warranted even on
    plain-error review.25     Given Alleyne's clear holding that facts
    which increase mandatory minimum sentences must be submitted to the
    jury and found beyond a reasonable doubt, see 
    id. at 2163,
    it was
    an obvious error to fail to properly instruct the jury that they
    were required to determine the special verdict question beyond a
    reasonable doubt. And since the district court sentenced Rivera to
    the enhanced mandatory minimum sentence of ten years -- based on an
    aggravating fact (drug quantity) that was not found beyond a
    reasonable doubt, and for which scant evidence was presented -- the
    25
    See 
    Rodriguez, 675 F.3d at 64
    . As we have previously noted,
    "[i]t may seem strange to talk about plain error, given how Alleyne
    came down after [the] defendants argued these consolidated appeals
    to us."    United States v. Acosta-Colón, No. 10-1076, 
    2013 WL 6654386
    , at *15 n.12 (1st Cir. Dec. 18, 2013). Nonetheless, we
    apply Alleyne's holding retroactively under the plain-error
    standard. See 
    id. -43- error
    affected Rivera's substantial rights and the outcome of his
    case.26
    Likewise, we cannot say that the error did not "'distort
    the fairness or integrity of the lower court proceedings in some
    extreme way.'"    See 
    Rodriguez, 675 F.3d at 64
    (quoting 
    Kinsella, 622 F.3d at 83
    ). The evidence on the "drug quantity" question here
    was far from overwhelming and uncontroverted. See 
    Cotton, 535 U.S. at 631-33
    (applying the fourth prong of the plain-error test, and
    stating that where evidence of a statutory element -- such as drug
    quantity -- is "'overwhelming'" and "'essentially uncontroverted,'"
    there is "'no basis for concluding that the error seriously
    affected the fairness, integrity or public reputation of judicial
    proceedings'" (quoting Johnson v. United States, 
    520 U.S. 461
    , 470
    (1997)) (internal quotation marks and alteration omitted)); cf.
    
    Harakaly, 734 F.3d at 95-97
    (holding that an Alleyne error was
    harmless when "the evidence of the triggering drug quantity was
    overwhelming");   
    Pérez-Ruiz, 353 F.3d at 17-20
      (vacating   the
    appellant's sentence after concluding that the government failed to
    26
    Indeed, at sentencing, the district court acknowledged that the
    statutory minimum may be "high" and representative of "an imperfect
    system," but stated that the court was nonetheless bound by the
    minimum. The court remarked to Rivera's counsel that: "If you find
    a case that says I can do away with the statutory minimum," or any
    case saying that "I can do what I want other than the statutory
    minimum, we'll deal with it.     But you know very well that the
    statutory minimum is the statutory minimum. It's a fact." Later,
    the court explicitly stated that it was sentencing Rivera "to the
    statutory mandatory minimum on the drug count, which is 120
    months."
    -44-
    show "overwhelming evidence" of drug quantity at trial and thus
    failed to demonstrate that the Apprendi error was harmless).
    While the exhibits in this case include photographs of
    seven "bricks" and a duffel bag, the video of the transaction shows
    only the four "bricks" that the purported buyer placed on top of
    the coffee table.    The video is not clear as to whether Rivera saw
    or handled more than four "bricks." There was no discussion on the
    video or in the preceding phone calls as to the quantity of drugs
    to be transacted, and there was no testimony presented that Rivera
    or Delgado were told the quantity of purported drugs involved. The
    "bricks" involved in this case were fake drugs, and no evidence was
    presented as to their actual weight.         For example, if the seven
    bricks actually weighed 0.7 kilograms each, their total weight
    would be 4.9 kilograms -- just shy of the five kilograms necessary
    for conviction of the aggravated offense.              Therefore, as in
    Pérez-Ruiz, this is not "a case in which the evidence tying the
    defendant to the charged conspiracy involved drugs that were
    indisputably in excess of the requisite amounts."        See 
    Pérez-Ruiz, 353 F.3d at 19
    .
    Under     these   circumstances,   we   do   not   consider   the
    evidence of the drug quantity involved to be "overwhelming" or
    "essentially uncontroverted."       See 
    Cotton, 535 U.S. at 633
    .
    Compare 
    Harakaly, 734 F.3d at 95-97
    (finding the drug-quantity
    evidence to be overwhelming when "[t]he delivery that the police
    -45-
    intercepted, taken alone, was nearly four times the triggering
    amount,"      and   when   the   defendant   himself   "acknowledged
    responsibility for a quantity of drugs that far exceed[ed] the
    triggering amount"), with 
    Pérez-Ruiz, 353 F.3d at 17-20
    (evidence
    that the conspiracy involved at least five kilograms of cocaine was
    not overwhelming when "actual drug quantities" were mentioned "only
    three times during the trial" -- including testimony from one
    witness that he supplied the drug ring with more than fifteen
    kilograms of cocaine, and testimony from a DEA agent that he
    estimated that the drug ring distributed "over 150 kilograms of
    cocaine").
    In sum, the record supports Rivera's contention that the
    district court plainly erred in failing to instruct the jury that
    the drug quantity question required a finding beyond a reasonable
    doubt.     In light of this instructional error, under Alleyne,
    Rivera's sentence cannot stand.     See 
    Alleyne, 133 S. Ct. at 2163
    -
    64.
    b. Remedy
    To the extent that Rivera claims entitlement to a new
    trial altogether in light of this error, however, he is mistaken.
    The district court's instructional error invalidates Rivera's
    ten-year mandatory minimum sentence under the enhanced penalty set
    out in § 841(b)(1)(A), but it does not call into question the
    -46-
    validity of his underlying conspiracy and attempt convictions under
    §§ 846 and 841(a).
    Neither conspiracy nor attempt includes "drug quantity"
    as an element of the core offense.             Under § 846, any person who
    either attempts or conspires to commit a drug offense shall be
    subject to the same penalties as the target offense.                    21 U.S.C.
    § 846.    We have previously held that a conviction for criminal
    attempt under § 846 requires proof of only two elements: "(1) an
    intent to engage in criminal conduct and (2) conduct constituting
    a 'substantial step' toward the commission of the substantive
    offense that strongly corroborates the criminal intent."                   United
    States v. Dworken, 
    855 F.2d 12
    , 17 (1st Cir. 1988) (emphasis
    omitted); United States v. Rivera-Sola, 
    713 F.2d 866
    , 869 (1st Cir.
    1983).
    To secure a conspiracy conviction under § 846, the
    government must prove that: "(1) a conspiracy existed; (2) the
    defendant had knowledge of the conspiracy; and (3) the defendant
    knowingly and voluntarily participated in the conspiracy."                 United
    States   v.    Maryea,   
    704 F.3d 55
    ,    73   (1st   Cir.    2013)   (citing
    
    Dellosantos, 649 F.3d at 116
    ).           Accordingly, the government need
    not   prove    a   particular   drug    quantity     in   order    to   secure   a
    conviction for the core offenses of conspiracy or attempt to commit
    a drug crime.      See, e.g., United States v. Daniels, 
    723 F.3d 562
    ,
    564, modified in part on reh'g, 
    729 F.3d 496
    (5th Cir. 2013)
    -47-
    ("[D]rug quantity is not an essential element of a conspiracy
    offense."); United States v. Yeje-Cabrera, 
    430 F.3d 1
    , 12-13 (1st
    Cir. 2005) (rejecting the argument "that unless the jury has found
    a specific quantity of drugs, a defendant cannot be guilty of
    conspiracy"); United States v. Gómez-Rosario, 
    418 F.3d 90
    , 104 (1st
    Cir. 2005) ("No specific drug quantity needs to be proven for a
    jury to convict a defendant of conspiracy to possess with intent to
    distribute.").
    Therefore, under Apprendi and Alleyne, drug quantity is
    an element for purposes of the aggravated penalties under §§
    841(b)(1)(A) and 841(b)(1)(B), but it is not an element necessary
    for conviction of the core offenses under §§ 841(a) and 846.         See
    
    Daniels, 723 F.3d at 573
    ("[W]here a defendant may be subject to
    enhanced statutory penalties because of drug quantity or type, the
    requisite fourth 'element' under Apprendi is not a formal element
    of the conspiracy offense."); United States v. González-Vélez, 
    466 F.3d 27
    , 35 (1st Cir. 2006) ("The quantity of drugs is not an
    element of conspiracy under § 846, nor is it an element of the
    underlying controlled substances offense under § 841(a)(2).");
    United States v. Collins, 
    415 F.3d 304
    , 314 (4th Cir. 2005) ("Guilt
    of the substantive offense defined in § 841(a) is not dependent
    upon   a   determination   of   the   amount   or   type   of   narcotics
    distributed."); United States v. Toliver, 
    351 F.3d 423
    , 430 (9th
    Cir. 2003), abrogated on other grounds by Blakely v. Washington,
    -48-
    
    542 U.S. 296
    (2004) ("[D]rug quantity and type need only be treated
    as 'functional equivalent[s]' of formal elements of an offense when
    a particular drug type or quantity finding would expose a defendant
    to   an   increased     maximum     statutory     sentence,     as   they   do   not
    constitute formal elements of separate and distinct offenses under
    section 841(b)(1).").
    In Alleyne itself, the defendant was charged, among other
    things, with using or carrying a firearm in relation to a crime of
    violence, under 18 U.S.C. § 924(c)(1)(A).              
    Alleyne, 133 S. Ct. at 2155
    .     That provision carries a default minimum of five years'
    imprisonment.       18 U.S.C. § 924(c)(1)(A)(i).                However, it also
    includes two enhanced penalties if additional aggravating facts are
    found: a minimum of seven years of imprisonment "if the firearm is
    brandished,"      and   a   minimum    of   ten   years   "if    the   firearm    is
    discharged."      
    Id. § 924(c)(1)(A)(ii)-(iii).
              The jury indicated on
    the verdict form that Alleyne had used or carried the firearm, but
    did not indicate that the gun was "brandished."                 Nonetheless, the
    district court found by a preponderance of the evidence that
    Alleyne had brandished the gun, and thus sentenced him to seven
    years' imprisonment.          The Supreme Court held that the Sixth
    Amendment requires that the sentencing enhancement for brandishing
    the gun must be found by the jury beyond a reasonable doubt.
    Alleyne,    133    S.   Ct.    at     2163-64.      Despite      the   fact      that
    "brandishing" was an "element" not found by the jury beyond a
    -49-
    reasonable doubt, however, the Court did not vacate Alleyne's
    conviction.    Rather, it "remand[ed] the case for resentencing
    consistent with the jury's verdict."         
    Id. at 2164.
    Thus, Alleyne in effect recognizes a distinction between
    "core crimes" and "aggravated crimes."        See 
    id. at 2161.
       In order
    to subject a defendant to the enhanced penalty of an aggravated
    crime, the aggravating element must be submitted to the jury and
    found beyond a reasonable doubt.       See 
    id. at 2161-63.
       Failure to
    do so invalidates the conviction as to the aggravated crime, but
    does not necessarily undermine the defendant's conviction for the
    core crime.   See 
    id. at 2161-64
    (vacating the defendant's sentence
    for the "aggravated crime" of brandishing a firearm -- when that
    aggravating element was found by the judge rather than the jury --
    and remanding for resentencing consistent with the jury's verdict
    of guilty on the "core crime" of using or carrying a firearm); see
    also United States v. McCloud, 
    730 F.3d 600
    , 604 (6th Cir. 2013)
    ("[T]he discussion in Alleyne to the effect that brandishing is an
    element rather than a sentencing factor was for purposes of the
    Court's Sixth Amendment analysis; it did not mean that Alleyne's
    conviction had to be reversed.").
    Here,   as   in   Alleyne,   the   enhanced   penalty   for   the
    aggravated offense is unavailable due to the absence of a beyond-a-
    reasonable-doubt jury determination on the aggravating element;
    however, the convictions on the core offenses remain sound.
    -50-
    Accordingly, Rivera's valid attempt and conspiracy convictions,
    without more, subject him to the default statutory range of
    penalties under § 841(b)(1)(C), regardless of the drug quantity
    involved.
    When faced with similar Apprendi and Alleyne claims,
    circuit courts have likewise reasoned that a successful appellant
    is not entitled to a new trial, but rather is only entitled to
    resentencing under the default penalty provision, § 841(b)(1)(C).
    See, e.g., 
    Daniels, 723 F.3d at 572
    (concluding, post-Alleyne, that
    the government's failure to prove drug quantity under § 841(b) does
    not undermine conspiracy convictions under §§ 846 and 841(a), but
    rather "only affects the sentence"); United States v. Kelly, 
    519 F.3d 355
    , 363 (7th Cir. 2008) ("[T]he remedy for a failure of proof
    that a defendant possessed a particular amount or type of cocaine
    would not be to grant him a judgment of acquittal or a new trial,
    but rather to remand for re-sentencing subject to the default
    statutory maximum term of twenty years."); 
    Gómez-Rosario, 418 F.3d at 108-09
    (affirming the defendant's conviction, but remanding for
    resentencing when the district court had improperly considered at
    sentencing facts not found by the jury, including the amount of
    heroin involved); 
    Collins, 415 F.3d at 314
    ("Because the conviction
    of conspiracy to violate § 841(a) is sound, remanding for a new
    trial is not the appropriate remedy."); 
    Pérez-Ruiz, 353 F.3d at 17
    ("Because the issue of drug type and quantity was not properly
    -51-
    submitted to the jury, the statutory maximum remained at 20 years."
    (citing 21 U.S.C. § 841(b)(1)(C))); 
    Toliver, 351 F.3d at 431
    ("[A]lthough the government failed to prove any of the specific
    drug quantities or that cocaine base/crack was involved in the
    conspiracy, the defendants were not entitled to a judgment of
    acquittal; rather, the district court was restricted in the maximum
    sentence it could impose."); cf. Pena, 
    2014 WL 448439
    , at *9
    (collecting cases that found error under Apprendi and Alleyne and
    remanded to the district court for resentencing).
    The determination that Rivera is not entitled to a
    retrial does not end our inquiry into the proper remedy, however.
    At a minimum, under Alleyne, Rivera is entitled to resentencing
    under § 841(b)(1)(C)'s default sentencing range.             But Rivera's
    interests are not the only interests implicated here.          In light of
    the reversal for procedural error, the government also has an
    interest in potentially retrying Rivera for the aggravated crime
    charged in the indictment.    Cf. United States v. Tateo, 
    377 U.S. 463
    , 466 (1964) ("Corresponding to the right of an accused to be
    given a fair trial is the societal interest in punishing one whose
    guilt is clear after he has obtained such a trial.           It would be a
    high price indeed for society to pay were every accused granted
    immunity from punishment because of any defect sufficient to
    constitute   reversible   error   in     the   proceedings    leading   to
    conviction.").
    -52-
    Because the Alleyne error here was an instructional
    error, the Double Jeopardy Clause does not prohibit retrial.     See
    U.S. Const. amend. V.; Burks v. United States, 
    437 U.S. 1
    , 14-15
    (1978) (noting that the Double Jeopardy Clause bars retrial for
    reversals due to insufficient evidence, but not reversals for
    procedural trial errors such as incorrect jury instructions);
    United States v. Lanzotti, 
    90 F.3d 1217
    , 1220-24 (7th Cir. 1996)
    (same); see also 
    Tateo, 377 U.S. at 466
    (explaining that where
    procedural defects at trial constitute reversible error, "the
    practice of retrial serves defendants' rights as well as society's
    interest").    Accordingly, we believe the proper remedy is that
    employed by the Fourth Circuit in Collins, which involved a failure
    to submit the question of individualized drug quantity to the jury.
    See 
    Collins, 415 F.3d at 313-15
    .
    The jury in Collins found the defendant guilty of a § 846
    conspiracy to distribute crack cocaine in violation of § 841(a).
    
    Id. at 314.
      The Collins district court, however, erred by failing
    to properly instruct the jury regarding the determination of drug
    quantity; this error affected the appropriate sentencing range
    under § 841(b).   
    Id. at 312-15.
       Since "[g]uilt of the substantive
    offense defined in § 841(a) is not dependent upon a determination
    of the amount or type of narcotics distributed," the Fourth Circuit
    held that the defendant's conspiracy conviction remained valid.
    
    Id. at 314.
      On that basis, the defendant was not entitled to a
    -53-
    retrial. 
    Id. However, the
    Fourth Circuit further reasoned that it
    would be inconsistent with the Sixth Amendment and Apprendi to
    remand the case and permit the district court upon resentencing to
    determine the quantity of cocaine for purposes of the penalties
    outlined in § 841(b).      
    Id. For those
    reasons, the Fourth Circuit withheld judgment
    on the conspiracy count, giving the government thirty days to
    request that the court order one of two remedies: (1) affirm the
    conspiracy conviction and remand for resentencing under the default
    penalty provision set out in § 841(b)(1)(C), or (2) reverse the
    conspiracy conviction and remand for a new trial. 
    Id. at 315,
    317.
    In analogous contexts, our sister circuits have at times employed
    the same remedy, giving the government the option to consent to
    resentencing under a lesser sentencing range, in lieu of a remand
    for a new trial.      See United States v. Garcia, 
    37 F.3d 1359
    , 1371
    (9th Cir. 1994), receded from on other grounds by United States v.
    Jackson, 
    167 F.3d 1280
    (9th Cir. 1999); United States v. Orozco-
    Prada, 
    732 F.2d 1076
    , 1084 (2d Cir. 1984); Brown v. United States,
    
    299 F.2d 438
    , 440 (D.C. Cir. 1962).
    We therefore will withhold judgment as to the conspiracy
    and   attempt    counts   for    thirty   days,   during    which    time   the
    government      can   request    either   (1)   that   we   affirm   Rivera's
    convictions and remand for resentencing under § 841(b)(1)(C) -- for
    which there is no mandatory minimum term of imprisonment, and a
    -54-
    statutory maximum of twenty years -- or (2) that we vacate Rivera's
    convictions and remand for a new trial, allowing the question of
    drug quantity to be properly submitted to a jury.
    C. Rivera's Remaining Challenges
    Rivera also lodges a number of other challenges to his
    conviction.   Because Rivera is not entitled to a new trial on the
    basis of the Alleyne error discussed above, we must consider the
    additional issues that he raises on appeal: (1) that the district
    court abused its discretion in denying a trial continuance, thus
    violating Rivera's right to a fair trial and effective assistance
    of counsel; (2) that the denial of a continuance deprived Rivera of
    effective assistance of counsel at voir dire, abrogating his right
    to a fair and impartial jury; and (3) that a series of evidentiary
    errors cumulatively undermined Delgado's right to a fair trial.
    Each of these contentions are examined in turn.
    1. The Denial of a Trial Continuance
    Rivera   argues   that    the     district   court   abused   its
    discretion in refusing to grant a brief continuance of the trial
    date, and that this refusal violated his rights to a fair trial and
    effective assistance of counsel.          Although we are persuaded that
    several factors weighed strongly in favor of granting the requested
    continuance, we find no prejudice and thus ultimately decline to
    grant Rivera relief on this issue.
    -55-
    a. Background
    The defendants were indicted on September 9, 2010.           The
    district court appointed Attorney Ramon L. Garay-Medina as Rivera's
    counsel on October 19, 2010. The court held two status conferences
    with counsel in the case: the first conference was held on November
    2,   2010,   during    which   the   court   scheduled   the   final   status
    conference for November 16, 2010. At that final status conference,
    the court scheduled the jury trial to begin three weeks later, on
    December 7, 2010.      On Friday, December 3, 2010, the court advanced
    the trial date by one day, rescheduling trial for 9:00 a.m. on
    Monday, December 6, 2010.        On that same Friday before trial, the
    government filed a motion in limine to preclude the defendants from
    (1) alluding to an entrapment defense during opening statements,
    without first making a proffer of "some hard evidence" supporting
    both elements of the entrapment defense, and (2) making any
    arguments aimed at jury nullification.           According to the record,
    the district court neither set a deadline for a response from the
    defense nor entertained oral argument on the government's motion,
    which the court granted -- without explanation -- shortly before
    trial on December 6, 2010.
    Early in the morning on the day of trial, Rivera's
    counsel filed an "emergency motion" for a one-week continuance so
    as "to allow completion of the investigation, and/or preparation
    for trial."    In that motion, counsel complained that at the final
    -56-
    status conference held November 16, 2010, the court scheduled trial
    for   December    7,   2010,   despite   the   protestations   of   "[b]oth
    attorneys" that "they needed more time to adequately prepare for
    this trial."     Additionally, the motion described a number of other
    criminal trials and cases for which Rivera's counsel was then
    responsible.     The motion noted that on December 3, 2010 -- the
    Friday preceding the Monday trial -- the government provided
    significant impeachment evidence to the defendants, amounting to
    "more than 600 pages of documentation (including sanitized reports
    that affect the investigation in preparation for trial)."27 Counsel
    asserted that he worked "in preparation for trial during the whole
    weekend," but that he "ha[d] not been able to complete reviewing
    the additional material provided."             Rivera suggested that the
    government would not be prejudiced by a one-week delay, given that
    the government "had years to investigate these cases, and prepare
    them for trial."       The motion also sought a court order requiring
    27
    Rivera's appellate brief clarified that this production included
    689 pages of documents that were material to the defense (the
    "Brady/Giglio materials"), which the government was required to
    disclose to the defense pursuant to Brady v. Maryland, 
    373 U.S. 83
    (1963) and Giglio v. United States, 
    405 U.S. 150
    (1972). Rivera
    notes that the disclosure included: (1) 509 pages of payment
    records for Officers I and II; (2) eighteen pages of redacted FBI
    reports "about an investigation into a stolen car and gun ring
    among [Puerto Rico] undercover police, indicating that it found
    [Officer II]'s version of the events less than reliable"; and (3)
    a 162-page Puerto Rico police file of misconduct investigations
    against Officer I. These investigations of Officer I included two
    investigations from 2000, one from 2002, and a case filed in 2010
    that arose from his role as an undercover agent in 2006.
    -57-
    the government to provide Rivera with unredacted versions of the
    reports disclosed on December 3, 2010.
    Immediately after the case was called for trial on
    December 6, 2010, counsel for the defense asked to approach the
    bench.   Rivera's counsel informed the court that he had filed a
    motion to continue earlier that morning.    It is apparent from the
    transcript that the district court had not read Rivera's motion and
    had no knowledge of the government's Friday-afternoon disclosures.28
    Rivera's counsel was given a brief opportunity to explain that
    despite working all weekend, he and his client were not able to
    complete discussions of the Brady/Giglio documents provided to the
    defense by the government on Friday.     Counsel noted that "[f]or
    example, there is information involving the confidential services,
    that there are complaints before the Supreme Court of Puerto Rico
    for fabricating cases against people." Without further discussion,
    the court immediately replied:
    Well, let me say this: We are not going to
    cross that bridge before we get there.     If
    there is an issue, a real issue that surfaces
    in the middle of trial that requires me to
    deal with it and give you whatever remedy we
    28
    The district court's responses indicated not only that it had
    failed to read the motion and consider the arguments raised
    therein, but also that it was not even aware that such a motion had
    been filed. The court inquired, "What are the circumstances? When
    was the motion filed?" The court repeated the question "[w]hat are
    the circumstances?" two more times, and also asked "What materials
    are we talking about? What is it you discovered? What is it that
    you discovered late?"
    -58-
    need, we'll deal with it.   But a continuance
    is out of the question.
    Given the perfunctory nature of the in-court discussion on this
    issue, and without the benefit of having read Rivera's motion, the
    district court denied the continuance without first learning the
    scope, volume, or precise nature of the disclosed documents.
    Shortly thereafter, the court addressed the potential jurors and
    began the process of selecting a jury.
    b. Applicable Law and Analysis
    Trial courts are granted broad discretion in scheduling
    trials and ruling on motions for continuances.     United States v.
    Maldonado, 
    708 F.3d 38
    , 42 (1st Cir. 2013).   While that discretion
    is limited by a defendant's constitutional rights to testimony by
    defense witnesses and effective assistance of counsel, United
    States v. Orlando-Figueroa, 
    229 F.3d 33
    , 39-40 (1st Cir. 2000),
    "'only an unreasoning and arbitrary insistence upon expeditiousness
    in the face of a justifiable request for delay violates the right
    to the assistance of counsel.'" 
    Maldonado, 708 F.3d at 42
    (quoting
    Morris v. Slappy, 
    461 U.S. 1
    , 11-12 (1983)).        Accordingly, a
    district court's denial of a motion to continue trial is reviewed
    for abuse of discretion.   United States v. Rosario-Otero, 
    731 F.3d 14
    , 18 (1st Cir. 2013).    Under this standard, we will not disturb
    such a decision if reasonable minds could disagree about the proper
    ruling.   See 
    Maldonado, 708 F.3d at 42
    .
    -59-
    In evaluating a denial of a continuance, we consider
    "'the reasons contemporaneously presented in support of the request
    for the continuance.'" 
    Rosario-Otero, 731 F.3d at 18
    (quoting West
    v. United States, 
    631 F.3d 563
    , 568 (1st Cir. 2011)).                 We may also
    consider a number of other relevant factors, including: the amount
    of    time   needed   for   preparation         compared   to   the   actual   time
    available; how diligently the movant used the time available, and
    whether the movant contributed to his or her perceived predicament;
    the   complexity      of   the   case;    other    available    assistance;    the
    probable utility of a continuance; the extent of any inconvenience
    to others (including the court, witnesses, and the opposing party);
    and the likelihood of injustice or unfair prejudice resulting from
    the denial of a continuance.             Id.; 
    West, 631 F.3d at 568
    (citing
    United States v. Saccoccia, 
    58 F.3d 754
    , 770 (1st Cir. 1995)).                  We
    consider this final factor to be essential, overturning the denial
    of a continuance only when the movant identifies specific, concrete
    ways in which the denial resulted in "substantial prejudice" to his
    or her defense.       See United States v. Pacheco, 
    727 F.3d 41
    , 45 (1st
    Cir. 2013); 
    Maldonado, 708 F.3d at 42
    ; United States v. Espinal-
    Almeida, 
    699 F.3d 588
    , 615 (1st Cir. 2012); United States v.
    Rodriguez-Marrero, 
    390 F.3d 1
    , 22 (1st Cir. 2004); 
    Saccoccia, 58 F.3d at 770
    .
    -60-
    Rivera complains that the abbreviated trial schedule left
    his counsel only twelve work days to prepare for trial.29         At that
    time, his trial counsel was responsible for eleven ongoing criminal
    cases before the district court, ten of which were older than
    Rivera's case, and six of which were pending trial.       Rivera argues
    that the hurried trial schedule and the denial of his motion for a
    one-week continuance violated his rights to a fair trial and
    effective    assistance   of   counsel.   In   Rivera's   view,    three
    developments occurred on December 3, 2010 (the Friday before trial)
    that increased the prejudice of this denial: (1) the trial court
    advanced the trial date by one day, from Tuesday, December 7 to
    Monday, December 6; (2) the government filed a motion in limine
    seeking to prohibit the defense from alluding to an entrapment
    defense or a jury nullification argument; and (3) that afternoon,
    the government delivered a nearly 700-page ream of partially-
    redacted Brady/Giglio materials to the defense.30
    29
    As previously noted, on November 16, 2010, the district court
    held the second and final status conference in the case. At that
    status conference, the court first set a date for trial: December
    7, 2010 -- just three weeks later. Rivera argues that the court
    imposed this date despite protestations from both defense counsel
    that they needed more time to prepare for trial.       Due to the
    Thanksgiving holiday, and the one-day advancement, the schedule
    left Rivera only twelve business days to prepare.
    30
    Such materials are required to be disclosed to the defense when
    the government has in its possession evidence, including
    impeachment evidence, that is material to either guilt or
    punishment. See 
    Giglio, 405 U.S. at 154
    ; 
    Brady, 373 U.S. at 87
    .
    The materials disclosed by the government included significant
    potential impeachment evidence concerning Officers I and II -- two
    -61-
    Rivera   argues   that   the    eleventh-hour   production   of
    Brady/Giglio materials "promised a wealth of material with which to
    impugn the credibility and motives of both of the [government's]
    chief trial witnesses."        Due to the limited time available to
    review these materials, Rivera maintains that trial counsel for the
    defendants were not able to put the materials to good use.          Rivera
    asserts that the defense thus failed to effectively establish,
    among other things, that Officer I: (1) was paid over $47,000 in
    benefits in excess of his police salary as compensation for his
    "active pursuit" of new targets for Operation Guard Shack; (2) used
    telephone calls and meetings to show his productivity to ensure the
    renewal of his $1,400 in monthly payments from the FBI; and (3)
    "convinced the FBI to give him a chance as an undercover agent
    after getting into too much (162 pages['] worth) [of] hot water as
    a local undercover officer."           The last-minute disclosure also
    included impeachment evidence regarding Officer II, including prior
    misconduct investigations into allegations that he had abused his
    undercover position to engage in criminal activities like theft and
    extortion.
    Noting that the district court made no findings and gave
    no explanation for denying the continuance, Rivera argues that any
    inconvenience to the court and the opposing party from a brief
    of the government's star witnesses, not just in this case, but
    presumably in multiple cases resulting from Operation Guard Shack.
    -62-
    continuance would have been minimal, given that the government had
    just three witnesses -- all of whom were government agents. Rivera
    further maintains that the resulting prejudice was not limited to
    trial counsel's inability to put the Brady/Giglio material to good
    use, but rather that the denial resulted in systemic prejudice due
    to trial counsel's ineffective assistance throughout the trial.31
    Rivera concludes that as a result of the district court's "'myopic
    31
    Throughout his brief, Rivera obliquely alludes to the allegedly
    ineffective assistance of his trial counsel, particularly in those
    sections challenging the denial of the continuance and the manner
    in which voir dire was conducted.        However, Rivera does not
    squarely present ineffective assistance of counsel as a separate
    issue for our review on this direct appeal. Therefore, we need not
    consider the issue independently here. See, e.g., United States v.
    Williams, 
    630 F.3d 44
    , 50 (1st Cir. 2010).
    Moreover, we do not generally address ineffective assistance
    claims on direct appeal, but instead require them to be raised on
    collateral review. See United States v. Neto, 
    659 F.3d 194
    , 203
    (1st Cir. 2011); United States v. Martinez-Vargas, 
    321 F.3d 245
    ,
    251 (1st Cir. 2003) ("The law is firmly settled in this circuit
    that, as a general rule, fact-specific claims of ineffective
    assistance of counsel, not raised below, cannot be aired for the
    first time on direct appeal.").      We deviate from this general
    practice and consider such claims on direct appeal "'only when such
    scrutiny of the factual record is unnecessary because the
    attorney's ineffectiveness is manifestly apparent from the
    record.'"    
    Neto, 659 F.3d at 203
    (quoting United States v.
    Rivera–González, 
    626 F.3d 639
    , 644 (1st Cir. 2010)) (internal
    quotation marks and alteration omitted).
    While the record before us seems to contain at least some
    evidence suggesting a lack of diligence and a subpar performance on
    the part of Rivera's trial counsel, an ineffective assistance claim
    was not raised separately on direct appeal, and the record and
    arguments have not been not sufficiently developed on the issue.
    Therefore, we decline to find ineffective assistance of counsel at
    this time, without prejudice to Rivera's right to assert that claim
    in the district court through an application for collateral relief.
    See 28 U.S.C. § 2255; see also 
    Neto, 659 F.3d at 203
    ;
    
    Martinez-Vargas, 321 F.3d at 251
    .
    -63-
    insistence upon expeditiousness,'" his trial counsel was physically
    present but unable to participate as an effective advocate.
    (quoting Ungar v. Sarafite, 
    376 U.S. 575
    , 589 (1964)).
    For its part, the government responds that Rivera's
    counsel   was   not   diligent    because   he    made   his   request    for   a
    continuance on the first day of trial, inconveniencing the court,
    the potential jurors, and the government.           The government reasons
    that "36 hours was sufficient time to review [the Brady/Giglio
    documents] in preparation for trial."            Noting that "[t]he defense
    was aware of the trial date as early as November 16, 2010,
    notwithstanding its single-day advancement," the government argues
    that twenty days was sufficient time to prepare for a trial that
    both sides agree was neither lengthy nor complex in terms of
    witnesses and exhibits.        Further, the government maintains that
    Rivera's assertions of his counsel's ineffectiveness due to the
    denial of the continuance are "speculative and insufficient to show
    prejudice," and constitute a thinly-veiled ineffective assistance
    of counsel claim that should not be considered on direct appeal.
    Finally, the government argues that the defense's decisions may
    have been the result of a deliberate strategy, and the "more likely
    reason" for Rivera's conviction was the "overwhelming evidence" of
    his guilt, including the video.
    We   agree   with     Rivera   that   several   relevant      factors
    militated strongly in favor of granting a continuance.              First, we
    -64-
    find that the time needed for effective preparation exceeded the
    time actually available.       While Rivera concedes that the case was
    neither lengthy nor complex in terms of witnesses and exhibits, we
    agree with him that the case involved difficult, time-intensive
    questions with respect to the limits of any potentially applicable
    entrapment    or    derivative      entrapment   defense,    and    the    means
    available with which to present such a defense. From the time that
    a trial date was first scheduled to the day trial began, the
    defense was left with only twelve business days to prepare. Rivera
    asserts -- and the government has not disputed -- that at the final
    status conference, the district court ignored protestations from
    both defense counsel that they needed more time to prepare for
    trial.   To add insult to injury, without consulting the parties or
    providing any explanation, on the Friday before trial the court
    advanced the trial date by one day, to commence on Monday -- the
    next business day.
    The final blow was delivered that same Friday afternoon
    by the government, when it dumped nearly 700 pages of Brady/Giglio
    materials    on    the   defense.      The   government     has    provided   no
    explanation or excuse for making such a voluminous disclosure on
    the eve of trial, without providing the defense even a single
    business day to review the redacted, 689-page production.                 Nor do
    we think a valid excuse exists here, given that: (1) Operation
    Guard Shack began as early as July 2008; (2) some of the underlying
    -65-
    impeachment documents, including FBI documents dated in the summer
    of 2008, were in the government's possession since near the
    beginning of the operation; and (3) the sham transaction for which
    Rivera and Delgado were prosecuted, and which involved Officers I
    and II, took place on July 24, 2009 -- one year and four months
    before trial. Under these circumstances, and in the absence of any
    explanation from the government, we fail to see how the eleventh-
    hour provision of the Brady/Giglio disclosures here could reflect
    anything other than ineptitude or strategic gamesmanship. For that
    reason, the government's argument that "36 hours was sufficient
    time to review [the documents] in preparation for trial" rings
    particularly hollow.
    The   evidence   before    us    is   mixed   on   how   diligently
    Rivera's trial counsel used the twenty days (twelve of which were
    business days) available to prepare for trial.                  Though Rivera
    asserts that at the final status conference he requested more time
    to prepare for trial, he waited until 3:22 a.m. on the date of
    trial to file a written motion for continuance, thus contributing
    to his own predicament. However, this factor is mitigated at least
    in part by the developments of Friday, December 3, including the
    last-minute advancement of the trial date and the government's
    extensive    Brady/Giglio      disclosures        that    afternoon,      which
    significantly changed the landscape on the eve of trial.                   The
    assertions by Rivera's trial counsel -- that despite having worked
    -66-
    all weekend, he was unable to fully review the Brady/Giglio
    materials and effectively prepare for trial -- weigh in favor of
    the probable utility of a one-week continuance to finish trial
    preparations in light of these new disclosures.
    While a one-week continuance would have resulted in some
    minor inconvenience, that inconvenience is attenuated by several
    facts.     First, as noted by Rivera, the government had only three
    witnesses, all of whom were government agents.            Moreover, the
    government      itself,   through     its   last-minute    Brady/Giglio
    disclosures, was responsible for one of the significant reasons for
    a continuance.     The inconvenience to the court was diminished by
    the fact that the court had another trial scheduled for the same
    day.      Earlier that morning, the court dismissed the jury in the
    other case, postponing that trial until the conclusion of Rivera's
    case.32    Given also that (1) this was a relatively short, three-day
    trial; (2) the district court originally set a brief, accelerated
    trial schedule; and (3) no prior continuances were granted in the
    case, the extent of any inconvenience stemming from a one-week
    continuance would have been minimal.        In sum, we find that the
    32
    Immediately after the bench conference in which the court denied
    Rivera's motion for a continuance, the court addressed the
    Delgado/Rivera jury: "Members of the jury, I'm sorry that I had you
    waiting.   I had to -- I had to select a jury for another case
    earlier today, this morning. . . . And I did that, and I sent
    those people away to start that trial after we conclude this one.
    So now we are going to select a jury for this one and start it
    right away."
    -67-
    balance of the foregoing factors weighed overwhelmingly in favor of
    granting the continuance.
    Considering also that the district court did not review
    Rivera's written motion, did not review the Brady/Giglio materials
    disclosed, did not inquire regarding the quantity or specific
    nature of the production, did not ask the government the reason for
    the extreme tardiness of the disclosure, did not weigh the relevant
    factors on the record, and did not entertain more than a cursory
    argument on the issue, it would seem that the district court's
    denial constituted "'an unreasoning and arbitrary insistence upon
    expeditiousness in the face of a justifiable request for delay.'"
    See 
    Maldonado, 708 F.3d at 42
    (quoting 
    Morris, 461 U.S. at 11-12
    ).
    Nonetheless, we must consider one final factor: whether
    Rivera suffered prejudice as a result of the denial.           See, e.g.,
    
    Maldonado, 708 F.3d at 42
    ; 
    Espinal-Almeida, 699 F.3d at 615-16
    ;
    
    Saccoccia, 58 F.3d at 770
    . "When Brady or Giglio material surfaces
    belatedly, 'the critical inquiry is not why disclosure was delayed
    but whether the tardiness prevented defense counsel from employing
    the material to good effect.'"     
    Pérez-Ruiz, 353 F.3d at 8
    (quoting
    United States v. Devin, 
    918 F.2d 280
    , 290 (1st Cir. 1990)).              To
    demonstrate   prejudice   and   overturn   a   verdict   in   the   delayed
    disclosure context, an appellant must show both: (1) some specific
    prejudice beyond a mere assertion; and (2) that "there is a
    reasonable probability that, had the evidence been disclosed to the
    -68-
    defense in a timeous manner or had the trial court given the
    defense more time to digest it, the result of the proceeding would
    have been different."   
    Id. at 8-9.
    Here, while we do not doubt that the defense would have
    been better prepared to impeach the government's witnesses if there
    had been more time to digest the Brady/Giglio materials, Rivera has
    failed to show a reasonable probability that the outcome of his
    case would have been any different if the trial court had granted
    the one-week continuance. See 
    id. Rivera cites
    several facts from
    the Brady/Giglio disclosures -- including the undercover officers'
    compensation for the operation, and investigations into prior
    misconduct by Officers I and II -- that would have allowed Rivera
    to further "impugn the credibility and motives of both of the chief
    witnesses." However, Delgado's counsel was in fact able to impeach
    Officer I's credibility by asking him, among other things, about
    his FBI compensation for participating in Operation Guard Shack; in
    response, Officer I testified that he received approximately $1,400
    per month. During cross-examination of the Special Agent, Rivera's
    trial counsel was able to ask about the alleged misconduct of both
    Officers I and II prior to their involvement with Operation Guard
    Shack. Therefore, the defense did in fact use the information from
    the disclosures to impeach the testimony of Officers I and II.
    Accordingly, in essence Rivera's claim is that -- were he given
    more time to review the materials -- he would have undertaken the
    -69-
    same trial strategy but would have done a somewhat better job of
    attacking the government witnesses' credibility.
    Rivera has failed to explain how, if the Brady/Giglio
    materials had been disclosed earlier or if the continuance had been
    granted, he would have employed a different, more effective trial
    strategy.    See, e.g., United States v. Lemmerer, 
    277 F.3d 579
    , 588
    (1st Cir. 2002) (stating that an appellant cannot rely on "'wholly
    conclusory assertions'" but must make at least "'a prima facie
    showing     of   a   plausible   strategic   option   which   the   delay
    foreclosed'" (quoting 
    Devin, 918 F.2d at 290
    )); United States v.
    Josleyn, 
    99 F.3d 1182
    , 1196 (1st Cir. 1996) ("[A] principal concern
    in delayed disclosure cases [is] whether the failure to supply the
    information in a seasonable fashion caused the defense to change
    its trial strategy." (emphasis added)).
    And even if all the Brady/Giglio information had been
    more effectively presented to the jury, there is not a reasonable
    probability that the jury would have found that the government
    failed to satisfy the elements of the offenses of conviction beyond
    a reasonable doubt. Rivera does not even allege that he could have
    used the Brady/Giglio material to prevent the government from
    meeting its burden of proof on any element of an offense of
    conviction.      Moreover, he does not challenge the district court's
    ruling that the entrapment defense applied only to Delgado.          Nor
    does Rivera argue before us now that the Brady/Giglio material
    -70-
    provided a factual basis for a valid derivative entrapment defense,
    or indeed, any other defense.33        The information contained in the
    disclosure    fails   to   vitiate   the    video   evidence   of   Rivera's
    participation in the sham transaction, which was corroborated by
    his codefendant's admissions at trial as well as the incriminating
    testimony provided by all three witnesses for the government.
    Given that Rivera does not specifically articulate how
    the Brady/Giglio material at issue would have allowed him to either
    (1) effectively challenge the government's burden of proof on any
    element of an offense of conviction, (2) establish a foundation for
    a viable defense, or (3) employ a different, more effective trial
    strategy, he has failed to show a reasonable probability that the
    trial's outcome would have been any different if the court had
    granted his motion for a continuance.        See 
    Pérez-Ruiz, 353 F.3d at 8
    -9.   Therefore, Rivera has failed to demonstrate specific and
    substantial prejudice, and -- although we are indeed troubled by
    what appears to be the district court's blind allegiance to speed
    over careful consideration of Rivera's justifiable request for a
    brief continuance -- his claim on this issue must ultimately fail.
    See 
    Maldonado, 708 F.3d at 42
    -44; 
    Pérez-Ruiz, 353 F.3d at 8
    -9.
    33
    As this issue was not raised on appeal, we express no opinion
    here as to whether an entrapment or derivative entrapment defense
    was available to Rivera. See 
    Williams, 630 F.3d at 50
    (stating
    that underdeveloped arguments are deemed waived on appeal).
    -71-
    2. Voir Dire
    Rivera further argues that the court's voir dire was
    inadequate to protect his right to a fair and impartial jury and to
    intelligently exercise his peremptory challenges.                For the reasons
    described below, we find no merit to this claim.
    Rivera   explicitly      concedes     that   the   court    did    not
    improperly refuse to ask specific questions of the jurors and did
    not generally employ improper procedures during voir dire. Rather,
    he   argues    that    the   court's   "race   to    trial   left   his   counsel
    apparently     incapable     of   participating      in    any   way,   either   by
    suggesting issues to the Court or requesting follow up questions
    about issues likely to create significant prejudice [to] his right
    to a fair trial."       In support of this argument, Rivera notes that
    his trial counsel proposed no questions, and in fact, "did nothing"
    during the voir dire process.
    Rivera further argues that there were four substantive
    issues that did not receive adequate attention at voir dire: (1)
    the trial court should have asked more specific questions about the
    jurors' knowledge of Operation Guard Shack, instead of asking just
    one question concerning whether they knew about "the facts of the
    case"; (2) although the court asked whether any juror worked (or
    had a family member who worked) for a law-enforcement agency, the
    court should have "inquired [] further" into the issue; (3) the
    court should have asked the jurors regarding the fact that the
    -72-
    video of the sham transaction included references to the San Juan
    mayor as a "cokehead," which could have prejudiced jurors who
    supported the mayor against the defendants; and (4) the court
    should have explored the jurors' attitudes regarding homosexuality,
    given that the government later presented evidence and argument
    suggesting that Rivera was romantically interested in a male
    undercover officer.
    Trial courts have "'broad discretion'" -- "'subject only
    to the essential demands of fairness'" -- in determining how to
    conduct voir dire.    United States v. Misla-Aldarondo, 
    478 F.3d 52
    ,
    60 (1st Cir. 2007) (quoting Real v. Hogan, 
    828 F.2d 58
    , 62 (1st
    Cir. 1987)).    The Supreme Court has "repeatedly emphasized" that
    jury selection "is 'particularly within the province of the trial
    judge.'"   Skilling v. United States, 
    130 S. Ct. 2896
    ,           2917 (2010)
    (quoting   Ristaino   v.   Ross,   
    424 U.S. 589
    ,   594–95    (1976)).
    Accordingly, "[n]o hard-and-fast formula dictates the necessary
    depth or breadth of voir dire," 
    id., and we
    review the trial
    judge's voir dire questioning for abuse of discretion, United
    States v. Sherman, 
    551 F.3d 45
    , 49 (1st Cir. 2008) (citing United
    States v. Bergodere, 
    40 F.3d 512
    , 517 (1st Cir. 1994)).            We grant
    "'special deference'" to the district court's determination of jury
    impartiality.   
    Id. at 51
    (quoting United States v. Moreno Morales,
    
    815 F.2d 725
    , 733 (1st Cir. 1987)).
    -73-
    We find no such abuse of discretion here.                    First, as
    previously noted, the trial court did not refuse to ask any
    questions requested by Rivera's counsel.                  Counsel requested no
    questions, and even if he had, the court was entitled to "cover[]
    the substance of the appropriate areas of concern by framing its
    own questions in its own words."               
    Real, 828 F.2d at 62
    (finding
    that   a   trial   court   need   not    "pose    every    voir   dire    question
    requested by a litigant"). The record shows -- and Rivera does not
    dispute -- that the court asked a series of questions to identify
    potential biases and inquired as to whether prospective jurors
    could be fair and impartial in deciding the case. See 
    Sherman, 551 F.3d at 52
    .    Thus, we find no abuse of discretion in the general
    manner in which the district court chose to conduct voir dire.
    We further find no merit to Rivera's four specific
    allegations of deficiencies in the voir dire process. With respect
    to the first two alleged deficiencies, Rivera admits that the
    district court asked about each issue.              While the court did not
    refer to Operation Guard Shack during voir dire, it did review the
    facts alleged in the indictment with the prospective jurors, and
    added that the two defendants "were police officers from Puerto
    Rico at the time the facts of this case allegedly occurred."                   The
    court then asked if any of the potential jurors "have heard of
    something that may be related to the facts of this case."                   No one
    responded in the affirmative.
    -74-
    The court also asked if any prospective jurors were law-
    enforcement   officers,   or    had    "close   relatives   who    are   law-
    enforcement officers, police officers."           None of the prospective
    jurors   indicated   that      they     were    law-enforcement     officers
    themselves; several told the court that they had family members who
    worked in law enforcement, but that this relationship would not
    affect their ability to be fair and impartial.              Given that the
    trial court inquired into both these issues, and in the absence of
    a specific showing of prejudice or more developed argumentation, we
    do not find that the district court abused its discretion in the
    breadth and depth of its questioning.
    With respect to Rivera's final two specific allegations
    of error, regarding disparaging comments concerning the mayor of
    San Juan and statements implicating Rivera's sexuality, Rivera
    concedes that the district court had no reason to know that either
    of these facts might become an issue in the trial.                Hence, the
    court could not have exceeded its "broad discretion" when it failed
    to ask prospective jurors about specific facts unknown to the
    court, unraised by the parties, and not yet at issue.                    See
    
    Misla-Aldarondo, 478 F.3d at 60
    .         On this record, Rivera has not
    shown that the district court abused its discretion in conducting
    voir dire and selecting a jury.
    -75-
    3. Alleged Evidentiary Errors
    Finally, Rivera alleges five evidentiary errors, which
    he argues cumulatively undermined his right to a fair trial.   We
    begin by examining each individual alleged error in turn.
    a. Testimony on Suspicion of Prior Corrupt Acts
    The first alleged evidentiary error identified by Rivera
    concerns the testimony of the government's first witness, the FBI
    Special Agent who helped set up the reverse sting.     The Special
    Agent testified that he was responsible for preparing the "bricks,"
    the undercover apartment, and the video equipment to record the
    sham transaction.   Though he did not object at trial, Rivera now
    complains that the Special Agent was permitted to testify that,
    before approaching a target for a reverse sting, undercover agents
    must have had a "reasonable suspicion" that the target was "corrupt
    or involved in illegal activities or believed to be involved in
    illegal activities."   Rivera asserts that such testimony was not
    relevant and was overwhelmingly prejudicial.    He argues that the
    testimony served only to suggest to the jury -- without any
    supporting evidence -- that Rivera had committed some crime or
    similar bad act before becoming involved in the reverse sting.
    Because Rivera failed to object at trial, we review the
    trial court's admission of the testimony for plain error.        See
    United States v. Powers, 
    702 F.3d 1
    , 10 (1st Cir. 2012).         The
    plain-error test is an "exacting standard."    See Long v. Fairbank
    -76-
    Reconstruction Corp., 
    701 F.3d 1
    , 5 (1st Cir. 2012) ("To establish
    plain error, a party must show that there was error, that it was
    plain, and that it affected the party's substantial rights; an
    appellate court may then notice the error only if it 'seriously
    affect[ed]    the   fairness,   integrity,     or    public   reputation     of
    judicial proceedings.'" (quoting United States v. Borrero–Acevedo,
    
    533 F.3d 11
    , 15 (1st Cir. 2008))).
    Rivera's   argument   misses    the    mark.     The    government
    presented no evidence that the FBI targeted Rivera, or that any
    government     agents   approached     him   to     recruit    him    for   the
    transaction.    Rivera was approached by his partner Delgado, who in
    turn was approached by Officer I.       Thus, the allegedly prejudicial
    effects of which Rivera complains concerned whether the undercover
    agents had a reasonable suspicion of Delgado, not Rivera. Contrary
    to Rivera's argument, the Special Agent's testimony did not suggest
    that Rivera himself had previously committed some crime or similar
    bad act. While Rivera and Delgado were charged with conspiracy and
    aiding and abetting each other, Rivera fails to explain how the
    implication that the government agents may have had a reasonable
    suspicion of Delgado affected Rivera's substantial rights.
    Given that the two codefendants were tried together, we
    do not think it improbable that an evidentiary error pertaining to
    one defendant could impact the rights of the other, or that a
    suggestion of corruption or criminality on the part of Delgado
    -77-
    could implicate Rivera by association.                 However, Rivera fails to
    connect the dots of such a theory, or explain how this alleged
    error meets the standard for plain-error review.                   Even assuming
    that    it   was   error    to    admit    the   testimony,    Rivera     has   not
    demonstrated       that    such    an    error   was    "plain,"   affected     his
    "substantial       rights,"      and    "seriously     affected"   the   fairness,
    integrity, or public reputation of the trial.                See 
    Long, 701 F.3d at 5
    .    Thus, his cursory argument has fallen short of the "rather
    steep" road to success under the "exacting" plain-error standard.
    See 
    Gelin, 712 F.3d at 620
    ; 
    Long, 703 F.3d at 5
    .
    Rivera further alleges that the Special Agent's testimony
    regarding reasonable suspicion of corruption or illegal activities
    violated Federal Rules of Evidence 403, 404(b), 405, 602, 701, and
    802.    Apart from reciting these conclusory allegations, however,
    Rivera fails to specifically explain how the Special Agent's
    testimony violated these evidentiary rules.                We need not consider
    such bare assertions on appeal.             See 
    Zannino, 895 F.2d at 17
    ("It
    is not enough merely to mention a possible argument in the most
    skeletal way, leaving the court to do counsel's work, create the
    ossature for the argument, and put flesh on its bones.").
    b. Sexual Orientation Evidence
    Secondly, Rivera argues that the introduction of evidence
    of the defendants' respective sexual orientations violated Federal
    Rules of Evidence 402 and 403 and violated his right to a fair
    -78-
    trial.   Rivera challenges the admission of two categories of such
    evidence: (1) evidence of Delgado's sexual orientation, and (2)
    evidence of Rivera's sexual orientation. Where there was a proper
    objection at trial, we review the district court's evidentiary
    ruling for abuse of discretion; where no such objection was made,
    we review for plain error.        See 
    Powers, 702 F.3d at 10
    .
    i. Delgado's Sexual Orientation
    We begin with the introduction of evidence regarding
    Delgado's    sexual    orientation.      Because       the    defense   properly
    objected to this evidence at trial, we review the admission of this
    testimony for abuse of discretion.           See 
    id. During the
    government's redirect examination of its first
    witness (the Special Agent referred to above), the government
    inquired    as   to   whether   the   Special   Agent        knew   "what   Raquel
    Delgado's civil status is."           Delgado's counsel objected to the
    questioning as irrelevant and outside the scope of Delgado's cross-
    examination.      Seeking to inquire further as to the reasons for
    Delgado's    divorce,    the    government    proffered       that   "the    agent
    interviewed Ms. Delgado's ex-husband, and he told him that they got
    divorced because she was having an affair with a female Sergeant."
    The court sustained the objection, explaining that "in the context
    of what we have in the case right now, it is extremely prejudicial,
    beyond the facts of the case."
    -79-
    Later in the trial, as previously described, Delgado
    testified that she had romantic affairs with Officer I, first in
    2005, and then during the summer of 2009 when she was rejecting his
    persistent invitations of part-time employment.              Delgado testified
    that in 2005, she and Officer I "had a sporadic relationship"
    during which they went on dates, visited each other's homes, and
    "slept together several times."           She further testified that weeks
    after the sham transaction, she and Officer I again had sexual
    intercourse.     An important component of Delgado's defense, theory
    of the case, and trial strategy was that Officer I improperly
    induced her to participate in the sham transaction by appealing to
    their long-lasting friendship and romantic relationship.
    Delgado's ex-husband also testified for the defense,
    stating   --   among   other    things    --   that    he   and   Delgado   "were
    boyfriend and girlfriend for almost three years, and we were
    legally married for five years."          He testified that he and Delgado
    had   children    together,     but   eventually       divorced    and   stopped
    communicating     regularly      except      through    their     children.
    During its cross-examination of Delgado's ex-husband, the
    government asked: "In fact, didn't you tell the FBI if they wanted
    to know any details about Raquel Delgado's wife -- or rather life,
    you would have to ask her girlfriend, San Juan Municipal female
    Sergeant Wanda Rivera?"        Delgado's counsel objected, and the court
    responded: "Overruled.     Isn't that what you told the agents? . . .
    -80-
    You have to answer the question, sir.    That's not an answer.   You
    have to answer the question."    In response, Delgado's ex-husband
    answered: "What I said was that if he wanted -- if they wanted to
    know about Mrs. Delgado, they should ask her friends, and Mrs.
    Wanda Rivera, who would have direct information."
    The government immediately pressed the point further:
    "Wait a minute.     You didn't tell the FBI that when you divorced
    Raquel Delgado, she was having an affair with Sergeant [Rivera]."
    At this point, the court overruled another objection from Delgado's
    counsel, who then requested a sidebar.     The court explained its
    reasoning to Delgado's counsel as follows:
    [N]ow it's relevant, because you are -- you
    are intimating in your evidence . . . that
    there is a man-woman relationship between the
    witness and your client. And I think the jury
    should consider whether there was a lesbian
    relationship between this woman and somebody
    else,   because   one   thing  is   kind   of
    inconsistent with the other.
    Usually lesbians or gay people don't
    cross lines to the opposite sex. Don't you
    think?
    Counsel disagreed, and the court responded, "Well, that's what I
    understand. . . .   That's what I've learned and seen in my 67 years
    of age."
    Delgado's counsel argued that the government was trying
    to elicit statements regarding Delgado's sexual orientation in
    order to divert the jury's attention from facts relevant to the
    defense of entrapment -- whether she had a predisposition to commit
    -81-
    a crime or if she was improperly induced -- to a matter (her sexual
    orientation) that had no bearing on the case.       Counsel continued:
    "She could have a perfect relationship with this man.         She had it
    for 16 years.     And she also had a relationship with a woman.     And
    that doesn't make her a criminal. . . .            It doesn't make it
    impossible to concede she had another male relationship."            The
    court replied, "[b]ut it is kind of inconsistent."       When Delgado's
    counsel   began    to   argue   that   the   evidence   was   "extremely
    prejudicial" under Rule 403, the court concluded: "well if you're
    asking under 403, the balancing is that it's relevant. Overruled."
    With that, the bench conference concluded, and the government
    continued asking the witness about Delgado's same-sex relationship.
    The inadequacy of the district court's faulty reasoning
    and Rule 403 "balancing" on this issue should be immediately
    obvious from the excerpts of the trial transcript referenced above.
    Nonetheless, we will spell out a few of the concerns here.           The
    competing arguments were effectively presented by Delgado's counsel
    (in favor of exclusion) and the district court (in favor of
    admission).     To the extent that the disputed testimony had any
    relevance to a fact of consequence in determining the case, such
    putative relevance was predicated on the idea that Delgado's one
    alleged homosexual relationship made it somewhat less probable that
    she also engaged in a heterosexual romantic relationship with
    Officer I, which in turn had some bearing on her entrapment
    -82-
    defense.    See Fed. R. Evid. 401 ("Evidence is relevant if: (a) it
    has any tendency to make a fact more or less probable than it would
    be without the evidence; and (b) the fact is of consequence in
    determining the action.").
    Whatever limited probative value this evidence might have
    had in isolation, however, was further undercut by the undisputed
    testimony    of    Delgado's    ex-husband      that      the   two    had   children
    together and maintained an eight-year heterosexual relationship --
    including three years of dating and five years of marriage.
    Regardless of what the district judge may have previously "learned
    and seen in [his] 67 years of age" about "lesbians or gay people
    [not] cross[ing] lines to the opposite sex," there was specific,
    uncontroverted testimony in this very case that Delgado maintained
    an eight-year heterosexual relationship with her ex-husband.
    No evidence was presented that Delgado was not interested
    in sexual relationships with men, or even that she preferred women
    to   men    as    sexual    partners.        Accordingly,       evidence      of   one
    relationship      with     another   woman     had   --   at    best   --    marginal
    relevance to the question whether she had a sexual relationship
    with Officer I.          Moreover, Delgado's entrapment defense did not
    hinge solely on the sexual nature of her relationship with Officer
    I, but rather also on testimony that the two had been friends since
    middle school, and that Officer I appealed to this relationship and
    -83-
    solicited her on a near-daily basis for approximately one month
    before she acquiesced to provide security for the sham transaction.
    As evinced in part by the government's persistence in
    hammering   the   largely      irrelevant        point   of    Delgado's      same-sex
    relationship,     evidence     of       homosexuality    has     the    potential   to
    unfairly prejudice a defendant.                  See, e.g., United States v.
    Yazzie,   
    59 F.3d 807
    ,    811       (9th    Cir.    1995)    ("[E]vidence      of
    homosexuality can be extremely prejudicial . . . ."); United States
    v. Ham, 
    998 F.2d 1247
    , 1252 (4th Cir. 1993) ("We accept without
    need of extensive argument that implications of . . . homosexuality
    . . . unfairly prejudice a defendant." (footnote omitted)); State
    v. Ford, 
    926 P.2d 245
    , 250 (Mont. 1996) ("There will be, on
    virtually every jury, people who would find the lifestyle and
    sexual    preferences     of        a     homosexual      or     bisexual      person
    offensive. . . .        [O]ur criminal justice system must take the
    necessary precautions to assure that people are convicted based on
    evidence of guilt, and not on the basis of some inflammatory
    personal trait."); ABA Standards for Criminal Justice, Prosecution
    Function and Defense Function, Standard 3–5.8(c), p. 106 (3d ed.
    1993) ("The prosecutor should not make arguments calculated to
    appeal to the prejudices of the jury.").                 Given the extremely low
    probative value of the evidence pertaining to Delgado's same-sex
    relationship,     we   think    it      patently   obvious       that   its    minimal
    probative value was substantially outweighed by the dangers of
    -84-
    unfair prejudice, confusing the issues, and misleading the jury.
    See Fed. R. Evid. 403.
    It is true that "[w]e give great deference to a district
    judge's balancing of probative value versus unfair prejudice."
    United States v. Breton, No. 12-2293, 
    2014 WL 30517
    , at *10 (1st
    Cir. Jan. 6, 2014).     This is the case "even when a judge does not
    expressly explain the Rule 403 balancing process on the record."
    
    Id. But while
    our review of a trial court's Rule 403 decision is
    deferential, it "is not completely without bite." Espeaignnette v.
    Gene Tierney Co., Inc., 
    43 F.3d 1
    , 5 (1st Cir. 1994).                    Here, we
    find that the trial court abused its discretion because, for the
    reasons explained above, the court made a serious mistake in
    weighing the danger of unfair prejudice against the testimony's
    minimal probative value.          See id.; see also Corporate Techs., Inc.
    v. Harnett, 
    731 F.3d 6
    , 10 (1st Cir. 2013).
    That determination does not end the inquiry, however.
    See 
    Espeaignnette, 43 F.3d at 9
    .         We may not disturb the verdict if
    the error was harmless -- that is, if it did not affect Rivera's
    substantial rights.     See id.; see also Fed. R. Evid. 103(a); Fed.
    R. Crim. P. 52(a).     For an evidentiary error of non-constitutional
    dimension,    the   error    is    harmless   if   we    "can   say   'with    fair
    assurance, after pondering all that happened without stripping the
    erroneous    action   from    the    whole,   that      the   judgment   was    not
    substantially swayed by the error.'"          United States v. Melvin, 730
    -85-
    F.3d 29, 39 (1st Cir. 2013) (quoting United States v. Sasso, 
    695 F.3d 25
    , 29 (1st Cir. 2012)); 
    Espeaignnette, 43 F.3d at 9
    .          We have
    such fair assurance here.
    For many of the same reasons that the testimony at issue
    was not highly probative of a fact of consequence in determining
    the action, the testimony was unlikely to have substantially swayed
    the jury's verdict as to Rivera.          On the theory espoused by the
    government and the district court, evidence of Delgado's sexual
    orientation was introduced to impugn one aspect of Delgado's
    testimony on the improper inducement element of her entrapment
    defense -- whether she had a romantic or sexual relationship with
    Officer I.     Delgado's sexual orientation has little to do with
    whether the elements of the offenses were satisfied as to Rivera or
    whether Rivera had a viable defense. The trial testimony and video
    provide damning evidence that Rivera participated in the sham
    transaction     and   satisfied   the   elements   of   the    offenses    of
    conviction.    Furthermore, as previously discussed, Rivera does not
    challenge    the   district   court's   ruling   that   no    entrapment   or
    derivative entrapment defense was available to him.               For those
    reasons, the district court's error in allowing testimony as to
    Delgado's sexual orientation was harmless as to Rivera, and we will
    not disturb the judgment below on the basis of this error.             See
    Fed. R. Evid. 103(a); Fed. R. Crim. P. 52(a); 
    Espeaignnette, 43 F.3d at 9
    .
    -86-
    ii. Rivera's Sexual Orientation
    Turning to evidence of Rivera's sexual orientation, we
    next consider his argument that what he deems to be "homosexual
    banter" in the video of the sham transaction -- coupled with
    testimony   and    argument   which    suggested   that   he   was   sexually
    interested in Officer III, the male undercover agent playing the
    role of the buyer -- sent a clear message to the jury about
    Rivera's homosexuality in order to "prey on long-standing and
    deeply rooted prejudices about homosexuals as deviants, miscreants,
    sinners and criminals." Specifically, Rivera directs our attention
    to three types of allegedly improper references to his sexual
    orientation   at   trial:     (1)   the   "homosexual   banter"   among   the
    participants depicted in the video of the sham transaction; (2) the
    testimony by Officer I that Rivera wanted the phone number of
    Officer III in order to give him a present and "get in touch with
    him" after the sham transaction;34 and (3) the testimony by Officer
    34
    During its opening statement, the government referenced this
    expected testimony from Officer I, arguing that Rivera "was so
    comfortable with the situation, he want[ed] a phone number of the
    buyer" -- Officer III -- after the deal was over. Indeed, the
    government continued to stress that after the sham transaction was
    completed, Rivera contacted Officer I "several times" because he
    wanted Officer III's phone number. At that point, Rivera's counsel
    objected, and asked to approach the bench. The court overruled the
    objection without sidebar, explanation, or further discussion,
    instructing the government to "[g]o ahead."          The government
    continued: "[Rivera] wants his phone number because he has a
    souvenir for him and wants to go out with him."           Given the
    objection at trial, we review the district court's admission of
    this statement in the government's opening for abuse of discretion.
    See 
    Powers, 702 F.3d at 10
    ; see also McPheeters v. Black & Veatch
    -87-
    II that "Angel [Rivera] was kind of interested in the guy, the
    other guy that was there" (presumably referring to Officer III).
    There were no objections at trial to these three types of evidence
    of Rivera's sexual orientation, so we review their admission for
    plain error.    See 
    Powers, 702 F.3d at 10
    .
    Even if it was error to admit the foregoing evidence and
    argument, such an error will not permit us to overturn Rivera's
    conviction if the error was harmless.     See Fed. R. Crim. P. 52(a);
    see also   
    Landrón-Class, 696 F.3d at 68
    ; United States v. York, 
    572 F.3d 415
    , 429 (7th Cir. 2009) ("Under either a plain error standard
    or an abuse-of-discretion standard, if those errors were harmless,
    [appellant's] conviction will stand.").     Here, we find that "it is
    highly probable" that any error in allowing evidence of Rivera's
    sexual orientation did not affect the verdict; thus, any such error
    was harmless.   See 
    Pridgen, 518 F.3d at 91
    .
    We agree with Rivera that evidence of his homosexuality
    was "relevant to nothing."       However, that same irrelevance cuts
    against him on the harmless-error analysis here.     Rivera's sexual
    orientation had absolutely nothing to do with whether his conduct
    satisfied the elements of the offenses of conviction, or whether he
    had a valid defense.    Rivera    fails   to explain -- under the
    particular facts of this case -- precisely how evidence of his
    Corp., 
    427 F.3d 1095
    , 1102 (8th Cir. 2005) ("We review a district
    court's management of opening statements for an abuse of
    discretion.").
    -88-
    homosexuality affected the jury's guilty verdict regarding his
    participation in the sham transaction.
    Unlike     Delgado,    Rivera    did    not   seek    to   support    an
    entrapment defense by presenting testimony and argument that an
    undercover agent improperly induced him to participate in the
    transaction by means of a romantic or sexual relationship.                      And
    Rivera   makes   no    argument   that     the    government's    evidence      was
    otherwise so weak that evidence of his homosexuality was likely to
    have tipped the scales against him.          Particularly given the highly
    incriminating evidence here -- including the video recording and
    the testimony of the government witnesses and his codefendant --
    there is a high probability that the alleged error concerning
    Rivera's homosexuality did not affect the verdict.                     See 
    id. Therefore, any
    such error was harmless and cannot serve to overturn
    his conviction. See id.; see also Fed. R. Crim. P. 52(a); Landrón-
    
    Class, 696 F.3d at 68
    ; 
    York, 572 F.3d at 429-30
    .
    c. Requiring Delgado to Admit the Charges
    In his third allegation of evidentiary error, Rivera
    argues that the district court violated his right to a fair trial
    when it required his codefendant Delgado to testify whether she
    admitted all the allegations of the indictment.                       He further
    maintains that "[t]he Court's sua sponte insistence on requiring
    Delgado to admit her culpability to the charge that she conspired
    -89-
    with [Rivera] demolished the presumption of innocence to him, no
    matter how she answered."
    Delgado testified in her own defense at trial.                   During
    direct    examination      by   her    counsel,       with   regard   to    the   sham
    transaction,      Delgado    admitted        that    she   "understood     that   what
    [Officer I] was doing was not something legal," and that she
    expected that she and Rivera would each make $2,000 for their
    participation.          Delgado also testified that "[a]fter all this
    insistence" from Officer I, she contacted Rivera, and together they
    "decided to go to the place" of the transaction.                         She further
    responded in the affirmative when her counsel asked, "Now, you were
    aware those were narcotics?            You realized it was something wrong
    you   were    doing?"       There     were    no    objections   to   any    of   this
    testimony.
    The government began its cross-examination of Delgado by
    immediately asking whether she admitted to participating in the
    drug transaction.        She agreed, saying, "I've admitted I did it, as
    I said, and I repeat, because of [Officer I's] insistence and
    because      of   the    relationship,         the    sentimental     or    romantic
    relationship I had with him and my trust in him."                     Hearing that,
    the government pressed her further: "So you admit every count in
    this Indictment; is that correct?"                   Delgado responded, "I was
    there, I repeat, I didn't --."               The district judge cut her short,
    interjecting, "[t]he question is whether -- we want an answer
    -90-
    whether you admit all the charges that are against you in this
    accusation.    That's all."
    Delgado's counsel objected, arguing that the question
    improperly elicited an answer as to the charges, although Delgado
    had already entered a plea. The court overruled the objection, and
    the government continued to press the point, asking whether she did
    the things alleged in the indictment. Delgado continued to respond
    that she "was there, and [her actions were] wrong."    She admitted
    that she knew the transaction involved drugs, but she did not admit
    that she knew the type of drug or the quantity involved.     Again,
    Rivera's counsel did not object to this line of questioning.
    On appeal, Rivera argues that the district court erred
    by not "remain[ing] alert" to his right against self-incrimination
    when Delgado waived her own right in her testimony at trial.     In
    Rivera's view, the district court "demolished the presumption of
    [his] innocence" when it forced Delgado to admit the charges on the
    stand, requiring Rivera "to rebut this powerfully incriminating
    evidence."    Rivera further complains that no appropriate curative
    instruction was given, and argues that this was a plain error of
    constitutional dimension.
    We agree with Rivera that it was highly improper -- for
    not just the prosecution, but especially for the trial judge
    himself -- to ask Delgado on the stand whether she admitted all the
    charges against her.    See, e.g., United States v. Levine, 180 F.3d
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    869, 872 (7th Cir. 1999) (stating that "the judge [must] make[] it
    clear to the jury that neither the questioner nor the witness
    defines the elements of the offense"); United States v. Espino, 
    32 F.3d 253
    , 257 (7th Cir. 1994) (finding the question whether the
    defendant was "admitting the conspiracy" to be improper because it
    required     a   conclusion     about     the   legal    consequences    of   the
    defendant's conduct, and not just about the predicate facts for
    such a conclusion -- namely, the existence of a conspiratorial
    agreement).      Even assuming an error of constitutional dimension
    with respect to the questions asked of Delgado, however, we find
    that   the   government    has    met   its     burden   of   proving   beyond   a
    reasonable doubt that the error did not influence Rivera's verdict.
    See 
    Melvin, 730 F.3d at 39
    (quoting 
    Sasso, 695 F.3d at 29
    ).
    With respect to the relevant testimony elicited from
    Delgado on cross, she did not ultimately yield to the demands of
    the prosecution and the district court to state a legal conclusion
    as   to   whether   she   was    guilty    of   the   counts   charged   in   the
    indictment.      Nor did she make any factual admissions that were
    materially different from her testimony on direct examination.
    Delgado's testimony, on both direct and cross, was consistent with
    her theory of the case -- namely, that she participated in the sham
    transaction, but that she was entitled to an entrapment defense
    because she was improperly induced by Officer I.                 Therefore, the
    exchange of which Rivera complains did not alter the nature or
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    extent of the evidence before the jury.        We are convinced beyond a
    reasonable doubt that the introduction of Delgado's redundant
    testimony on cross did not influence the verdict; hence, any error
    on this issue was harmless.      See 
    id. d. Restriction
    of Cross-Examination, and Opinion
    Testimony from Lay Witnesses
    Lastly, Rivera seeks to piggyback on Delgado's arguments
    regarding two final alleged evidentiary errors: (1) that the
    district court unduly restricted cross-examination to issues raised
    on direct, thereby refusing to allow proper impeachment questions;
    and (2) that the court erred by admitting inadmissible lay opinion
    testimony from Delgado's ex-husband.
    Rivera's brief devotes a grand total of five sentences to
    addressing these two issues.           And two of those five sentences
    merely state that Rivera adopts the relevant arguments presented in
    Delgado's   brief.      Rivera   was   certainly   entitled   to   join   in
    Delgado's brief or to adopt by reference parts of her brief.              See
    Fed. R. App. P. 28(i).      However, "[a]doption by reference cannot
    occur in a vacuum and the arguments must actually be transferable"
    from Delgado's case to Rivera's appeal.            See United States v.
    Brown, 
    669 F.3d 10
    , 16 n.5 (1st Cir. 2012).           "In this context,
    issues that are averted to in a perfunctory manner absent developed
    argumentation are waived."        
    Id. Here, as
    in Brown, Rivera's
    attempt to join Delgado's arguments on these two errors was
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    "textbook perfunctory -- he offered no explanation as to why her
    arguments pertained to him."        See 
    id. Delgado's argument
    on the first issue focused on her
    claim that the improper limitations on the cross-examination of
    Officer I "prevented Delgado [] from presenting important evidence
    that aided her in establishing her only defense, that she was
    entrapped   by   [Officer    I]   into   participating     in   the   offense
    conduct."    With respect to the second issue, Delgado argued that
    the admission of improper lay opinion testimony from her ex-husband
    "cannot be considered harmless since precisely the matter [on]
    which he expressed an opinion o[r] belief concerned the most
    crucial ultimate issue of fact at trial; that the jury should
    reject Delgado['s] entrapment defense based on his opinion as to
    what he would do under similar circumstances."            Thus, both issues
    concern Delgado's sole defense of entrapment.
    As previously discussed, Rivera does not appeal the
    district court's ruling that no such defense was available to him.
    Having failed to "'connect the arguments adopted with the specific
    facts   pertaining'   to    him,"   Rivera    has   not   properly    adopted
    Delgado's arguments.       See United States v. De La Paz-Rentas, 
    613 F.3d 18
    , 29 (1st Cir. 2010) (quoting United States v. Bennett, 
    75 F.3d 40
    , 49 (1st Cir. 1996)).       For that reason, Rivera has waived
    these two issues.     See 
    Brown, 669 F.3d at 16
    n.5.         Moreover, even
    without a finding of waiver, we are convinced that any alleged
    -94-
    error with respect to these two evidentiary issues was harmless.
    See 
    Melvin, 730 F.3d at 39
    .
    e. Cumulative Error
    Having found that none of the five evidentiary errors
    alleged by Rivera are individually cause for relief, we turn
    finally to his claim that these errors cumulatively undermined his
    right   to    a       fair   trial.      We    have      previously   accepted    the
    "theoretical underpinnings" of such a cumulative-error claim --
    namely, that "[i]ndividual errors, insufficient in themselves to
    necessitate       a    new   trial,    may    in   the    aggregate   have   a   more
    debilitating effect."           United States v. Sepulveda, 
    15 F.3d 1161
    ,
    1195-96 (1st Cir. 1993).              In examining such claims, we weigh the
    trial errors "against the background of the case as a whole, paying
    particular weight to factors such as the nature and number of the
    errors committed; their interrelationship, if any, and combined
    effect; how the district court dealt with the errors as they arose
    (including the efficacy -- or lack of efficacy -- of any remedial
    efforts); and the strength of the government's case." 
    Id. at 1196.
    Rivera was entitled "to a fair trial, not to a mistake-
    free trial."          See 
    id. Considering the
    nature of the errors here,
    we find that these errors were largely tangential to facts material
    to the jury's adjudication of Rivera's guilt.                         As previously
    described, the government's case against Rivera was strong; it
    included testimony by three government agents involved in the
    -95-
    sting, as well as a video depicting Rivera's participation in the
    sham transaction. Moreover, Rivera's codefendant Delgado testified
    that she and Rivera participated in the transaction.             On this
    record, we cannot say that the five alleged evidentiary errors
    cumulatively "call into doubt the reliability of the verdict and
    'the underlying fairness of the trial.'"          See United States v.
    Sanabria, 
    645 F.3d 5
    05, 519 (1st Cir. 2011) (quoting United States
    v. Meserve, 
    271 F.3d 314
    , 332 (1st Cir. 2001)).          Therefore, like
    his     individual   allegations   of     evidentiary   error,   Rivera's
    cumulative-error claim must also fail.
    III. Conclusion
    Based on the foregoing, Delgado's convictions are vacated
    and her case is remanded for a new trial.
    With respect to Rivera's case, for the reasons described
    above, his sentence cannot stand in light of the Supreme Court's
    decision in Alleyne.        We therefore withhold judgment on his
    convictions for thirty days, during which time the government can
    request either that we affirm Rivera's convictions and remand for
    resentencing under 21 U.S.C. § 841(b)(1)(C), or that we vacate
    Rivera's convictions and remand for a new trial, allowing the
    question of drug quantity to be properly submitted to a jury
    applying the beyond-a-reasonable-doubt standard.
    Vacated and remanded in part, and judgment withheld in
    part.
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