United States v. Rose , 802 F.3d 114 ( 2015 )


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  •             United States Court of Appeals
    For the First Circuit
    Nos. 13-1525
    13-1683
    13-2420
    13-2460
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    RUSSELL C. ROSE;
    KELVIN FRYE,
    Defendants, Appellants.
    APPEALS FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Nathaniel M. Gorton, U.S. District Judge]
    Before
    Howard, Chief Judge,
    Torruella and Kayatta, Circuit Judges.
    Rosemary Curran Scapicchio for appellant Kelvin Frye.
    Jamesa J. Drake and Drake Law, LLC, for appellant Russell C.
    Rose
    Kirby A. Heller, Attorney, Appellate Section, Criminal
    Division, U.S. Department of Justice, with whom Carmen M. Ortiz,
    United States Attorney, James E. Arnold and David J. D'Addio,
    Assistant United States Attorneys, District of Massachusetts,
    Leslie R. Caldwell, Assistant Attorney General, and David A.
    O'Neil, Acting Deputy Assistant Attorney   General,   Criminal
    Division, were on brief, for appellee.
    September 18, 2015
    HOWARD, Chief Judge. Russell Rose and Kelvin Frye appeal
    convictions stemming from their respective roles in a Cape Cod
    based   drug-distribution   conspiracy.       Their     claims   challenge
    several aspects of the proceedings below.           Finding no reversible
    error, we affirm.
    I.
    We begin with a brief overview of the case, saving a
    detailed recitation of the facts for the applicable analytical
    section below.    We present the facts in an objective manner.        See
    United States v. Burgos-Montes, 
    786 F.3d 92
    , 99 (1st Cir. 2015).
    The government charged Rose, Frye, and fourteen others
    with conspiring to distribute, and to possess with intent to
    distribute, cocaine and heroin.       See 21 U.S.C. §§ 846, 841(a)(1),
    841(b)(1)(B).     The conspiracy was alleged to have lasted from
    approximately March 2008 until November 2010, and Rose and Frye
    were purportedly leaders in it.
    The government's investigation into Rose and Frye picked
    up steam in mid-2010, and the two were ultimately arrested,
    indicted, and tried.      At trial, the government relied on the
    testimony of the case agent (Agent Timothy Quinn), recordings of
    wiretapped phone calls between the co-conspirators, and testimony
    from    co-conspirators   Delrico    Graham   and    Stefan   Pina.    The
    prosecution     also   introduced      physical     evidence,    including
    contraband discovered at Rose's residence.
    - 3 -
    A jury ultimately convicted both Rose and Frye on the
    drug-conspiracy charge, and the judge sentenced each of them to
    twenty-five years in prison.        This timely appeal followed.
    II.
    After carefully considering each of the defendants'
    contentions and extensively reviewing the record, we find four
    arguments to be worthy of discussion; the remainder lack arguable
    merit.    We therefore limit our focus to: (1) the defendants'
    complaints    respecting     the   government's    wiretapping   of   their
    phones; (2) Rose and Frye's arguments concerning Agent Quinn's
    testimony; (3) Rose's challenge to the search of his home; and (4)
    both defendants' sentencing challenges grounded on Alleyne v.
    United States, 
    133 S. Ct. 2151
    (2013).
    A.   Wiretaps
    At trial, the government relied heavily on the tapes of
    intercepted     phone     calls    between   the   co-conspirators.    Both
    defendants argue that the phone wiretaps that produced the tapes
    were unnecessary and were therefore improperly authorized.
    1.      Background
    Nearly two years into the government's investigation,
    agents requested permission to intercept calls to or from the
    telephones of Frye and Michael Andrews (another co-conspirator).
    To support that request, Agent Quinn submitted an 89-page affidavit
    that detailed the alleged criminal activities of Frye and Andrews,
    - 4 -
    the sources of information that led to that background knowledge,
    and   details   of    the    investigation    itself.       The   affidavit
    specifically enumerated the prior, unsuccessful use of various
    other investigative methods, including: physical surveillance;
    review of prison tapes; use of confidential informants; use of pen
    registers, trap and trace devices, and toll records; execution of
    search    warrants;    use    of   grand    jury   subpoenas;   interviews;
    intelligence from undercover agents; and examinations of discarded
    trash.    Agent Quinn also explained why the government believed
    that there was probable cause for intercepting the calls.
    Agent Quinn eventually filed six additional, analogous
    requests targeting phones belonging to Frye, Graham, and Rose.
    Although each affidavit was extensive in its own right, each also
    incorporated the facts from the previously submitted requests.          As
    in the initial application, Agent Quinn meticulously described the
    prior investigative techniques and then explained why the phone
    intercepts were necessary.          Based on these descriptions, the
    warrant judge (Saris, C.J., D. Mass.), authorized each wiretap.
    Prior to trial, the defendants moved to suppress the
    wiretaps, see 18 U.S.C. § 2518(1)(c), and the court denied the
    motion.   At trial, recordings of several of the calls were played,
    with a significant number capturing these defendants (along with
    other co-conspirators) discussing, albeit in code, their plans to
    purchase or sell drugs.
    - 5 -
    2.    Discussion
    Our inquiry is guided by Title III of the Omnibus Crime
    Control and Safe Streets Act of 1968, 18 U.S.C. §§ 2510-2522, which
    governs the rules for federal telephone wiretaps. The law requires
    an officer to obtain judicial preclearance before instituting a
    wiretap by filing "a full and complete statement as to whether or
    not other investigative procedures have been tried and failed or
    why they reasonably appear to be unlikely to succeed if tried or
    to be too dangerous."          
    Id. at §
    2518(1)(c).        This aptly-named
    "necessity"   prong    requires    the     government     to    have    "made     a
    reasonable,   good     faith    effort   to   run   the    gamut       of    normal
    investigative procedures before resorting to means so intrusive as
    electronic interception of telephone calls."               United States v.
    Cartagena, 
    593 F.3d 104
    , 109 (1st Cir. 2010) (internal quotation
    marks and citation omitted).
    When   a   defendant    challenges      on    appeal   a        court's
    "necessity" determination, we ask whether "the facts set forth in
    the   application      were    minimally      adequate     to    support        the
    determination that was made."       United States v. Yeje-Cabrera, 
    430 F.3d 1
    , 7 (1st Cir. 2005) (internal quotation marks and citation
    omitted).   Likewise, when a defendant asserts that the requesting
    officer omitted critical information from the affidavit that would
    have otherwise altered the court's necessity analysis, we only
    consider "whether, had the omitted information been included,
    - 6 -
    there would still have been a 'minimally adequate' basis for
    determining that the wiretap was necessary."              
    Burgos-Montes, 786 F.3d at 103
    .
    Rose and Frye begin with a broad attack on Agent Quinn's
    affidavit.     They argue that Quinn withheld critical information
    from the judge when applying for the wiretaps, namely, that the
    government had placed a GPS tracking device on Frye's car.
    Although    Agent    Quinn   theorized   about      the   possible,
    future use of a GPS-tracking device, he was far from Goldfinch-
    ian in the level of detail he provided about his actual, past
    reliance on it.      Nonetheless, he did adequately explain why the
    telephone intercepts would have still been necessary even if the
    officers were to utilize a tracker in the future. That explanation
    clarified why a GPS-tracking device was inferior to a telephone
    intercept    and   why    the    GPS-device   was   insufficient       for   this
    investigation.      For    instance,      Quinn   wrote   that    "there     is   a
    significant risk that any GPS device[] would be discovered," and
    that such devices "provide no information about who (if anyone)
    [an individual] is meeting with, why he [or she] traveled to a
    particular location, and what happened once he [or she] was there."
    More specifically, Agent Quinn, aware from a wiretapped call that
    an individual had previously informed Frye to check his car for a
    "tracker," noted that "Frye (or at least one of his associates) is
    well aware of this law enforcement technique."
    - 7 -
    Agent     Quinn's     reasoning     equally   explains    why    the
    wiretaps were necessary, even given the government's actual use of
    the GPS device.    Indeed, if Agent Quinn had written his statements
    in the past tense, rather than as a hypothetical, the judge's
    necessity inquiry would have remained exactly the same.                    If
    anything, the failure to put more information about the GPS tracker
    actually undersold the probable cause that existed to support the
    application.    We ultimately "find no reason to conclude that the
    inclusion of [more information respecting past use of the GPS
    tracker] would have prevented the judge from deciding that a
    wiretap should [have been] issued."          
    Cartagena, 593 F.3d at 111
    .
    After that broad pitch, Rose specifically narrows in on
    wiretap applications #4 (Graham's phone) and #7 (Rose's phone).
    He notes that Agent Quinn's proffered justification for tapping
    phone #4 was to discover the "source of supply" of the drug
    conspiracy.    Tapping phone #7, meanwhile, was allegedly necessary
    in order to learn more information about another co-conspirator,
    "Papa Doc."     But, Rose says, these justifications were overly
    broad, and the applications sought information that the government
    already possessed.
    The     central     flaw   in    Rose's   argument   is   that    he
    incorrectly     assumes     that     any     "partial   success     of     the
    investigation" eliminates the need for further evidence.              United
    - 8 -
    States v. Cao, 
    471 F.3d 1
    , 3 (1st Cir. 2006).1      As Agent Quinn
    persuasively demonstrated, however -- and in sufficient detail,
    despite Rose's protestations otherwise -- the government was still
    seeking a wealth of information at the time that it submitted the
    wiretap applications.   Further, Agent Quinn adequately described
    why any other investigative technique would not yield the evidence
    obtainable by a wiretap.
    For example, Quinn noted that "although agents have
    observed Graham in the presence of Rose and Frye on multiple
    occasions, I know very little about the nature of his relationship
    with them."    As for "Papa Doc," Agent Quinn wrote that "my
    information about Papa Doc is quite limited, as I do not know his
    true identity," and that he was unaware of the amount of product
    that came from "Papa Doc."   He also indicated that the wiretaps
    could provide information as to how the conspirators obtained the
    drugs, the role that each individual played in the conspiracy, and
    the "means, and methods of the operation of the conspiracy."    As
    Agent Quinn wrote,
    I believe that Graham, who has served as
    Rose's   narcotics  courier  and   has   been
    intercepted      discussing      distribution
    quantities of cocaine with Frye . . . [will
    assist] investigators [to] obtain a more
    1  Indeed, such a rule would make little sense. An affiant
    seeking a wiretap is required to establish probable cause.       In
    order to do so, one would expect for other investigative techniques
    to have been somewhat successful at the time of the wiretap
    application.
    - 9 -
    detailed understanding of Graham's role [and]
    to identify more fully the members of the
    conspiracy, its methods and manners of
    operations, sources of supply, associates,
    customers, and illicit profits.
    These       detailed   representations     to   the   court   were   minimally
    adequate to support the warrant-judge's decision.2
    Ultimately, given Agent Quinn's extensive declarations,
    combined with the deferential standard of review applicable to
    this wiretap challenge, we are satisfied that no error occurred.
    B.   Overview Testimony
    Frye    and   Rose   next   contend    that    the    government
    improperly utilized Agent Quinn as an "overview witness," that is,
    he allegedly provided a broad summary of the government's entire
    case and discussed evidence not then in the record.
    Frye advances two other arguments that fall within the
    2
    penumbra of this challenge. First, he challenges the use of the
    GPS tracking device itself under the Supreme Court's decision in
    United States v. Jones, 
    132 S. Ct. 945
    , 949 (2012) (finding that
    such an investigative technique constitutes a search for Fourth
    Amendment purposes). As in United States v. Sparks, however, the
    good-faith exception to the exclusionary rule would apply to this
    pre-Jones use of a GPS tracker. 
    711 F.3d 58
    , 62 (1st Cir. 2013)
    (concluding that before Jones, it was reasonable for an officer to
    believe that the Fourth Amendment did not apply to investigations
    of vehicles on public ways). Second, Frye asserts that a Franks
    hearing was required to investigate Agent Quinn's decision to omit
    information about the past use of the GPS tracker in his wiretap
    application.     Given the dearth of evidence reflecting an
    intentional or reckless omission, no clear error existed in the
    denial of that request. See United States v. Hicks, 
    575 F.3d 130
    ,
    138 (1st Cir. 2009).
    - 10 -
    1.   Background
    The government's central witness was Agent Quinn.      The
    government called him on the third day of trial, and his testimony
    described activities covering the entire length of the conspiracy.
    Most notably, he spent a significant period of time testifying
    about the taped phone calls between the co-conspirators.
    To lay a proper foundation, Agent Quinn first explained
    how the phone wiretaps operated logistically.     He then clarified
    the role that he played in reviewing the calls and testified that
    he heard nearly 90% of the calls in real time.           From this
    experience, Agent Quinn said that he became familiar with the
    voices of the key players in the conspiracy, along with the terms
    that they used.   He also noted that he was conversant in the drug-
    distribution "lingo" from prior investigations.
    His testimony developed a consistent rhythm.     After the
    prosecutor played a tape recording of an intercepted call between
    co-conspirators, Agent Quinn would answer questions respecting
    what he heard.    As calls were played, Agent Quinn noted whom he
    believed was talking and then described his understanding of the
    discussion's context.   In doing so, he defined his understanding
    of terms such as "the shop," "a ball," "half a rope," "brown," and
    "tuck or swallow" -- all common nomenclature in this and other
    drug conspiracies.
    - 11 -
    The defendants fastidiously preserved their objections
    to this testimony and moved for a mistrial.                     The district court
    overruled their objections and denied the motion.
    2.      Discussion
    We review the district court's rulings for abuse of
    discretion.     United States v. Vázquez-Rivera, 
    665 F.3d 351
    , 357
    (1st Cir. 2011) (evidentiary rulings); United States v. Freeman,
    
    208 F.3d 332
    , 339 (1st Cir. 2000) (denial of a motion for a
    mistrial).
    Both Rose and Frye argue that Agent Quinn's testimony
    essentially    "link[ed]    together       the    testimony      provided   by   law
    enforcement     and   other        non-cooperating         witnesses      and    two
    cooperating witnesses."         In the defendants' view, Agent Quinn
    "placed   an   imprimatur     of    veracity"       on    the    other   witnesses'
    statements.     Compounding all of this, they say, was that his
    testimony    "was   presented      early   during        trial   to   describe   the
    government's theory of the case."
    We have consistently admonished against the use of an
    "overview witness" by the government.              Such a witness is typically
    "a government agent who testifies as one of the prosecution's first
    witnesses and, as the term implies, provides an overview or roadmap
    of the prosecution's case to come."              United States v. Etienne, 
    772 F.3d 907
    , 913 (1st Cir. 2014); see, e.g., United States v. Meises,
    
    645 F.3d 5
    , 13-18 (1st Cir. 2011) United States v. Flores-de-
    - 12 -
    Jesús, 
    569 F.3d 8
    , 20-26 (1st Cir. 2009); United States v. Casas,
    
    356 F.3d 104
    , 117-21 (1st Cir. 2004).                  An overview witness is
    generally problematic as he or she may influence the jury's
    determination of facts or credibility assessments not yet in
    evidence; he or she may also provide testimony differing from what
    is to come; and the jury may place greater weight on the witness's
    testimony   since     it    "has   the    imprimatur    of   the   government."
    
    Etienne, 772 F.3d at 913
    (internal citation omitted).
    Overview       testimony     customarily    contains    "conclusory
    statements that are not based on the witness' personal knowledge,
    and which are unreliable because they often consist of inadmissible
    hearsay evidence," rather than testimony that is "squarely based
    on [a witness'] personal knowledge."            United States v. Díaz-Arias,
    
    717 F.3d 1
    , 13 (1st Cir. 2013).                 Where an officer testifies
    exclusively about his or her role in an investigation and speaks
    only to information about which he or she has first-hand knowledge,
    the testimony is generally (barring a different evidentiary issue)
    permissible.     See 
    id. (noting that
    such testimony is admissible
    since it is not the type of broad, overarching discussion about
    "the   results   of    a    criminal     investigation,      usually   including
    aspects" the agent did not participate in) (internal citation
    omitted); see also United States v. Rosado-Pérez, 
    605 F.3d 48
    , 55
    (1st Cir. 2010).
    - 13 -
    We do not find Agent Quinn's testimony (which, it should
    be noted, occurred on the third of seven days of trial, and thus
    was not the first testimony that the jury heard) to be overview
    testimony, let alone improper overview testimony.                 Agent Quinn
    testified exclusively from his personal knowledge, and he based
    his statements on his familiarity with the investigation and his
    exposure to the voices on the calls.            Indeed, he first testified
    that he had heard 90% of the calls as they came in and, as a
    result, became intimately familiar with the voices and terms that
    were used.     While his testimony may have canvassed the entire
    breadth of the conspiracy, he limited his discussion to his
    specific     role     in   the     investigation    and     his     first-hand
    understanding of the events.            That Agent Quinn was actually
    involved throughout the entire investigation, and thus was able to
    provide such detail about it, is simply not a reason to re-
    characterize his statements as inappropriate overview testimony.
    See United States v. Laureano-Pérez, -- F.3d --, 
    2015 WL 4577763
    at *15 (1st Cir. July 30, 2015) ("Appropriate testimony does not
    become     improper    overview     testimony    just     because       one   law
    enforcement     official     was     present     throughout       the     entire
    investigation and is then called to walk the jury through the
    investigation from beginning to end."). Nor, we note, did he vouch
    for other witness' credibility, discuss evidence not yet in the
    record, or provide testimony that would otherwise raise red flags
    - 14 -
    in this context.    See, e.g, 
    Etienne, 772 F.3d at 913
    ; 
    Meises, 645 F.3d at 15
    .
    Finding nothing to give us concern, we need go no further
    to reject this challenge.3
    C.   Search of Rose's Home
    We     next   turn   to     Rose's   argument   that   officers
    impermissibly searched the curtilage of his home, and that the
    government then obtained a warrant for that property based solely
    on the search.
    1.     Background
    On November 16, 2010, Rose and Frye were overheard on a
    wiretapped call discussing a plan to purchase two kilograms of
    cocaine from "Papa Doc."       Rose and Frye then met at a pharmacy
    where Frye gave Rose $28,000 for the deal. Rose subsequently drove
    home and arranged for Omay Ford (another co-conspirator) to pick
    up the drugs.    Later in the day, Ford drove to a gas station near
    Rose's residence and waited for roughly twenty-five minutes until
    3    The parties, particularly Rose, also appear to make a
    slightly distinct though overlapping argument. They suggest that
    Agent Quinn's testimony violated Federal Rules of Evidence 701 and
    702 because he both lacked personal knowledge and because his
    testimony did not aid the jury. As noted, however, Agent Quinn
    testified exclusively from his personal knowledge. Moreover, his
    testimony plainly assisted the jury in that it helped to place a
    significant number of calls into context. The district court did
    not abuse its discretion in admitting this evidence. See Díaz-
    
    Arias, 717 F.3d at 11-15
    .
    - 15 -
    an Acura SUV parked next to him.        Ford approached the SUV, leaned
    in, and appeared to retrieve something.
    Government agents were surveilling Ford and followed him
    to Rose's home.      After Ford entered the residence, agents, led by
    Detective Brian Cohoon, took up a perimeter around the house.
    Detective Cohoon crouched near the front door and peered through
    its glass.    After observing for a period of time, Detective Cohoon
    saw Rose carrying a stack of cash.           Cohoon thus approached the
    door, knocked, and announced, "Police, can you open the door?"
    Rose responded by screaming, closing the blinds, grabbing several
    items, and running upstairs with Ford.            Believing that Rose and
    Ford were about to destroy contraband, the officers entered the
    home.   They then arrested Rose and Ford before securing the scene.
    The following day, Agent Quinn obtained and executed a
    search warrant for the home.          That search yielded roughly two
    kilograms of cocaine, 440 grams of marijuana, and more than $75,000
    in cash.
    Rose   moved   to   suppress   the   fruits   of   the   search.
    Although the district court perfunctorily stated that the officers
    entered the property in "bad faith," it nonetheless denied the
    motion.      It held that the agents' entry on November 16 was
    justified by exigent circumstances, and that the warrant obtained
    on the 17th was saved by the independent source doctrine.
    - 16 -
    2.     Discussion
    We review legal questions underpinning the denial of the
    motion to suppress de novo and any factual findings for clear
    error.    United States v. Silva, 
    554 F.3d 13
    , 18 (1st Cir. 2009).
    Rose   highlights       two   alleged    errors    in   the   district
    court's decision.       First, he focuses on the night of November 16
    and argues that the officer's presence on the curtilage of the
    property constituted an impermissible search.                  He then contends
    that the district court failed to consider the effect of this
    illegal    activity     on    the   alleged    exigent    circumstances       that
    followed.      Second, Rose argues that this impermissible search was
    the primary impetus for the search warrant the following day and,
    accordingly, tainted any physical evidence obtained from that
    search.
    As we explain, we are not able to definitively resolve
    the legal merits of Rose's argument.               Even assuming that Rose is
    correct   in     his   assertion     of   error,    however,    any   error    was
    ultimately harmless.         To reach that end point, we briefly examine
    the two relevant exceptions to the exclusionary rule: the exigent
    circumstances and independent source doctrines.               We begin with the
    former.
    The    exclusionary      rule     is   inapplicable     where   "'the
    exigencies of the situation' make the needs of law enforcement so
    compelling that the warrantless search is objectively reasonable
    - 17 -
    under the Fourth Amendment."    Mincey v. Arizona, 
    437 U.S. 385
    , 394
    (1978) (quoting McDonald v. United States, 
    335 U.S. 451
    , 456
    (1948)).   A recent case in which the Supreme Court applied this
    doctrine was Kentucky v. King, 
    131 S. Ct. 1849
    (2011).          There,
    officers approached a residence with the intent to knock on a door
    and chat with the inhabitants. 
    Id. at 1854.
    However, the officers
    believed that they heard the defendants destroying evidence, and
    thus entered the property.     
    Id. The Court
    held that the exigent
    circumstances doctrine applied since, inter alia, in approaching
    the door and knocking, the officers did nothing more than any
    ordinary citizen had a right to do.      
    Id. at 1862.
    Here, the district court relied on King when applying
    the exigent circumstances doctrine. But the district court appears
    not to have addressed the threshold issue of whether the officers
    "violat[ed] the Fourth Amendment," 
    id. at 1858,
    by conducting a
    search around the curtilage of Rose's home and, if so, whether
    that violation sparked the exigent circumstances.       The outcome of
    that threshold inquiry depends on "whether the officer's conduct
    was . . . objectively reasonable," that is, "whether the officers
    had an implied license to enter" the curtilage and then station
    themselves around the house. Florida v. Jardines, 
    133 S. Ct. 1409
    ,
    1417 (2012). If not, and if "their behavior objectively reveal[ed]
    a purpose to conduct a search, which is not what anyone would think
    - 18 -
    he [or she] had license to do," 
    id. at 1417,
    then their presence
    on the property was impermissible.
    This record leaves us unable to determine precisely what
    the officers were doing when they entered the property on the
    evening of November 16.         The district court briefly noted that the
    officers   entered     the   property       in    "bad    faith";      a    conclusory
    statement without any predicate factual findings, and one that is
    not dispositive as to whether the officers' presence violated the
    Constitution.        See 
    King, 131 S. Ct. at 1859
    .                 Other than that
    single statement, the district court did not find any additional
    facts that shed light on the length of time that the officers
    surveilled before knocking on the door, or that described the
    officers' intent, or that otherwise established the officers'
    precise movements.         Simply stated, we do not know whether the
    officers observed Rose's incriminating actions because they were
    waiting    to   approach     the    suspects      until     they    had      proof   of
    contraband,     or    whether      the     officers      were   just       positioning
    themselves around the property in anticipation of a knock and talk.
    See 
    Jardines, 133 S. Ct. at 1415
    ("[The Fourth Amendment] would be
    of little practical value if the State's agents could stand in a
    home's porch or side garden and trawl for evidence with impunity;
    the right to retreat would be significantly diminished if the
    police could enter a man's property to observe his repose from
    just outside the front window"); see also 
    King, 131 S. Ct. at 1858
    - 19 -
    ("The exigent circumstances rule justifies a warrantless search
    when the conduct of the police preceding the exigency is reasonable
    in the same sense."); cf. Horton v. California, 
    496 U.S. 128
    , 136-
    40 (1990).
    Given that absence of factual findings on the issue of
    lawful presence, we proceed under the assumption that the officers'
    entry on November 16 was improper.          As such, we next ask whether
    the search warrant obtained the following day was thereby tainted.
    As the district court noted, that claim hinges on whether the
    warrant was obtained independently of any impermissible police
    conduct and thus saved by the independent source doctrine.              To
    evaluate an independent source claim, we ask whether "the agents'
    decision to seek the warrant was prompted by what they had seen
    during the initial [illegal] entry."        United States v. Dessesaure,
    
    429 F.3d 359
    , 369 (1st Cir. 2005) (quoting Murray v. United States,
    
    487 U.S. 533
    , 542 (1988).        That subjective inquiry thus turns on
    whether the particular officer would have still sought the warrant
    absent the unlawfully-obtained information.             "In making [that]
    factual determination . . . the district court is not bound by
    after-the-fact assurances of [the officer's] intent, but instead
    must   assess   the   totality   of   the   attendant   circumstances   to
    - 20 -
    ascertain     whether   those   assurances    appear   implausible."      
    Id. internal quotation
    marks omitted).4
    In this case, the district court concluded that the
    independent source doctrine applied.          It noted that "the evidence
    Agent Quinn marshaled in support of the search warrant application
    came from sources wholly unconnected with the entry and was known
    to    the   agents   well   before   the   initial   entry."      While   that
    observation is true enough, it reveals little about Agent Quinn's
    subjective intent.      That is, there was no finding that Agent Quinn
    would have sought the warrant irrespective of the November 16
    search.
    As we see it, the record (specifically Agent Quinn's
    declarations in the wiretap applications that he would seek a
    warrant for Rose's residence as soon as drugs were connected to
    his    house)    "provide[s]    [some]     support   for   the   Government's
    position.       
    Murray, 487 U.S. at 543
    .       But, as the Supreme Court
    reminded in Murray, "it is the function of the District Court
    rather than the Court of Appeals to determine the facts."                 
    Id. This is
    true even where a court of appeals could theoretically
    4In addition to the subjective prong of the analysis, we
    examine whether "information obtained during the entry was
    presented to the Magistrate and affected his [or her] decision to
    issue the warrant." 
    Id. at 365
    (quoting 
    Murray, 487 U.S. at 542
    ).
    This aspect of the analysis is "wholly objective." 
    Id. On this
    factor, our review of the warrant application leaves little doubt
    that the independent information was sufficient to support the
    judge's decision to issue the warrant.
    - 21 -
    cobble   together   varying     aspects   of   the   record   to    infer   the
    officer's subjective intent.        See 
    id. (concluding that
    while the
    district court found that one could "perhaps infer from [the facts]
    that the agents who made the entry already planned to obtain the
    'critical evidence through a warrant-authorized search' it was not
    strong enough for the court of appeals to find the fact on its
    own); see also United States v. Wright, 493 F.App'x 265, 271-72
    (3d Cir. 2012); cf. United States v. Cordero-Rosario, 
    786 F.3d 64
    ,
    78 (1st Cir. 2015).     Thus, even if we were inclined to say that
    the district court would likely have found an intent to seek the
    warrant given the court's ultimate adoption of the independent
    source doctrine, the absence of such a finding hinders our ability
    to conclusively rule on this challenge.
    As noted, however, remand is not necessarily required
    even were we to credit the defendant's arguments.                  Instead, we
    must ask whether the "government can prove beyond a reasonable
    doubt that the [putative] error complained of did not contribute
    to the verdict obtained."        United States v. Green, 
    698 F.3d 48
    ,
    53-54 (1st Cir. 2012) (internal quotation marks and citation
    omitted).
    In   this   case,     the     government    referred      to    the
    potentially-tainted physical evidence in its opening and closing
    arguments.   But, such evidence played a minimal role in the larger
    context of the government's case.         We are therefore confident that
    - 22 -
    the remaining evidence was so overwhelming that, even if this
    evidence should have been excluded, its inclusion did not affect
    the verdicts.   A brief summary shows why.
    The government presented compelling evidence reflecting
    the length and breadth of the conspiracy, along with the specific
    role that each defendant played.    That evidence begins with the
    detailed testimony of two eyewitnesses, co-conspirators Pina and
    Graham.
    Graham testified that he agreed to, and did, distribute
    both cocaine and heroin with Rose and Frye.         Indeed, Graham
    discussed a number of occasions on which he delivered drugs
    directly to both defendants, and to occasions when he saw both
    individuals with large quantities of cocaine.    He indicated that
    he had known Frye for twelve years, transported cocaine on his
    behalf, and was often paid in cocaine for his services.    He also
    discussed a specific instance in which he had transported cocaine
    from Rhode Island to a condominium where Frye and Rose were waiting
    for the delivery.   Finally, he identified Ford as Rose's supplier.
    For his part, Pina testified in significant detail about
    times in which he had obtained drugs for Frye.          He further
    testified that he received an "eight-ball" of heroin from Rose and
    Frye.   Significantly, he discussed an instance when Rose and Frye
    came to his house and obtained a kilo of cocaine, then pressed it,
    blended it, cut it up, and bagged it for sale.
    - 23 -
    Crucially, the government's case did not rest on the
    admittedly sufficient, but arguably always open to challenge,
    testimony of cooperating witnesses.      Rather, that testimony was
    corroborated and repeatedly reinforced by the vivid portrait of
    defendants painted in their recorded conversations and surveilled
    actions, as well as the physical contraband unconnected with the
    challenged search or its arguable fruits.       This evidence easily
    established four central events that formed the heart of the
    government's case.
    First, the government introduced evidence that on the
    evening of September 19, 2010, Rose was in contact with his seller,
    Omay Ford.    Rose then sent Graham to pick up a kilogram of cocaine
    from Ford. Graham subsequently did so and then delivered the drugs
    to Rose.   Rose, however, was displeased with the product.   He thus
    ordered Graham to return the bag because the product was "no good."
    He also paid Graham for these services in cocaine that was, in
    contrast to the cocaine obtained from Ford, described as "banging."
    Second, the government established that on September 21,
    2010, Frye and Pina attempted to mail a package of heroine to
    Anthony Vaughn.    Frye and Pina went to a pharmacy and purchased an
    item in which to hide the drugs.         Frye then arranged for an
    associate to mail the package, but a postal inspector recovered
    the package mid-transport.    The inspector found nearly 10 grams of
    heroin inside of the package.
    - 24 -
    The government also highlighted an event from later that
    same month in which Frye and Pina were awaiting a delivery of
    cocaine.     Law enforcement had been surveilling the van making the
    delivery.      A state trooper pulled the van over for a driving
    violation, searched the vehicle, and discovered nearly 200 grams
    of   heroin.     The   co-conspirators       were    later   overheard   during
    wiretapped conversations discussing this event.5
    The final, central event, previously discussed, occurred
    just before the putatively illegal search on November 16.                   The
    government     established   that   before     the    officers   even    entered
    Rose's property, Rose and Frye had agreed to purchase two kilograms
    of cocaine for $28,000.      The two then took multiple overt steps -
    - most notably, transferring money from one individual to the other
    -- to accomplish that goal.
    On the whole, we are satisfied beyond a reasonable doubt
    that a jury would have convicted these two defendants even if the
    evidence recovered from the search of Rose's home was improperly
    admitted.      The challenged evidence was cumulative; there was
    already sufficient testimony and physical evidence respecting both
    5Even defendant's use of code words of the "trade" (itself
    an inculpatory behavior) did not conceal the probative force of
    their conversations. Thus, for example, in describing the truck
    that was pulled over and what was found in the truck, Adalberto
    Graciani said to Frye, "Ah, estimate about 40, 40,000 I think in
    heroin, and -- I mean, $40,000 worth in the streets and she he --
    they was sayin."
    - 25 -
    the conspiracy itself and the vast quantity of drugs flowing
    through it.    Nor, given all of this other evidence, do we think
    that the brief mention of the physical contraband during arguments
    at trial affected the result.6    Thus, questions about the legality
    of the officers' conduct in entering Rose's home on November 16,
    2010, are not sufficient to disrupt the convictions.
    D.   Alleyne
    This brings us to the defendants' sentences.     Rose and
    Frye argue that the district court, rather than the jury, made
    certain drug-quantity findings, and that the court then imposed a
    6  Early in its opening statement to the jury, the government
    did appear to emphasize the physical evidence.           But, the
    prosecutor's reference to the items seized on November 16 quickly
    transitioned into a discussion of the events and evidence that led
    to the government's search that day. Indeed, of the nearly thirty
    minute opening statement, the government spent roughly five
    minutes discussing the events of the 16th. Only about one minute
    of that time discussed the physical contraband.
    The closing argument even more plainly manifests the minimal
    role that the physical contraband played in the case.          The
    government began its closing argument by reminding the jury of the
    evidence that it had heard. The prosecutor specifically referenced
    the taped phone calls and the live testimony, while only obliquely
    referring to "all of the exhibits." Following this, the government
    discussed the events of November 16 and emphasized that Rose and
    Frye's actions on that day were sufficient by themselves for the
    jury to find the two guilty.       In making that argument, the
    government again focused on the phone calls and the events leading
    up to the search; not the physical evidence.        In total, the
    government spent roughly one third of its thirty-three minute
    closing argument on the events of November 16. Of that time, it
    devoted about one minute to the physical contraband. Although the
    government thereafter referred to the physical evidence (including
    contraband independent of the events of November 16), it simply
    did so sporadically and as icing on an already-baked cake.
    - 26 -
    statutory mandated sentence based on those findings, in violation
    of Alleyne v. United States, 
    133 S. Ct. 2151
    (2013).
    1.     Background
    At   sentencing,    the    district     court   determined   by   a
    preponderance of the evidence that Rose was responsible for at
    least 9 grams of cocaine, 20 grams of heroin, and 1.77 kilograms
    of marijuana.        Those quantities subjected Rose to a mandatory
    minimum sentence of 20 years, 21 U.S.C. §§ 841(b)(1)(A)&(B) & 846,
    although neither the court nor the parties mentioned that mandatory
    minimum at sentencing.         In contrast to the 240-month statutory
    minimum,    calculations    pursuant     to   the    sentencing    guidelines
    resulted    in   a    recommended     360-month     to   life   incarcerative
    sentence.    The district court, finding that the guidelines range
    was inflated, imposed a below-guidelines sentence of 300 months.
    Likewise, the court concluded that Frye was responsible
    for 14 kilograms of cocaine and 923.05 grams of heroin, which also
    subjected him to a 20-year mandatory minimum. At Frye's sentencing
    hearing, the district court noted in passing that this mandatory
    minimum applied. Like Rose, Frye's guidelines range was 360 months
    to life. The court, relying on the factors enumerated in 18 U.S.C.
    § 3553(a), varied below the guidelines range and also sentenced
    Frye to 300 months in prison.
    - 27 -
    2.    Discussion
    Typically, we review de novo whether a sentence was
    improper under Alleyne.          See 
    Etienne, 772 F.3d at 922
    .            But
    unpreserved claims of Alleyne error, such as those here, are
    reviewed for plain error.       United States v. Harakaly, 
    734 F.3d 88
    ,
    94 (1st Cir. 2013); see United States v. Ramos-González, 
    775 F.3d 483
    , 499 (1st Cir. 2015) (plain error requires a showing of an
    error that "was clear or obvious, and that it both affected [the
    defendant's]      substantial    rights   and    seriously    impaired    the
    fairness,      integrity,   or      public      reputation     of   judicial
    proceedings.").7
    The    government    states   that    "[t]he     district    court
    violated Alleyne by concluding that Rose [and Frye were] subject
    to a mandatory minimum based on judge-found drug quantities."
    Despite that apparent concession, we question whether any Alleyne
    error actually occurred.        See 
    Etienne, 772 F.3d at 922
    ("Although
    the parties agree an Alleyne error occurred, their stipulation on
    this question of law is of no import.").             In United States v.
    7   Rose concedes that he did not preserve his Alleyne claim
    and thus plain error review applies. Frye, by contrast, goes to
    some length to show that he preserved the issue.       Yet, in the
    district court below, he objected only to "the quantities set forth
    in the PSR and request[ed] an evidentiary hearing on the issue of
    quantity." He did not argue that the jury, rather than the court,
    was required to make the drug quantity determination beyond a
    reasonable doubt. Accordingly, Frye has not preserved the precise
    claim that he now asserts. See United States v. Samboy, 
    433 F.3d 154
    , 161 (1st Cir. 2005).
    - 28 -
    Ramírez-Negrón, we noted that "failing to prove an individualized
    drug quantity is an Alleyne error only in cases in which the
    defendant has been convicted and sentenced under the aggravated
    version of the statute -- that is, where an enhanced mandatory
    minimum applies." 
    751 F.3d 42
    , 49 (1st Cir. 2014) (emphasis added)
    (internal quotation marks and citation omitted).            With respect to
    one of the defendants in that case, we concluded that "[t]he record
    provides no evidence that the district court made any findings to
    trigger a . . . mandatory minimum; rather, it shows that the court
    imposed a Guidelines sentence."       
    Id. at 50.
        We found it relevant
    that "neither the judge nor either party at sentencing even
    mentioned that a mandatory minimum was under consideration . . . .
    Instead, the sentence was based only on Guidelines consideration."
    
    Id. The record
    here -- other than a brief reference to the
    mandatory minimum in Frye's case -- is quite similar.                 For both
    defendants,    the   court   exclusively   based    its    sentence    on   the
    guidelines, and thus seemed to avoid sentencing the defendants
    under   the    aggravated    statutory     provisions.        Indeed,       when
    discussing    the    drug-quantity   findings,     the    court   framed    the
    question as one that solely affected the guidelines inquiry.                The
    court stated that it would "use that [its findings] as [to] the
    number of kilos to establish the base offense level."              Utilizing
    that base offense level, and the factors referenced in 18 U.S.C.
    - 29 -
    § 3553(a), the court then imposed sentences based purely on
    guidelines considerations.             While the court's single reference to
    the mandatory minimum perhaps makes Frye's case a bit closer, we
    are nonetheless inclined to say that Alleyne was not implicated
    here.    See United States v. Lanza-Vázquez, ___ F.3d ___, 
    2015 WL 5042806
    , at *14 (1st Cir. Aug. 27, 2015) ("Although the district
    court in this case made a passing reference that the amount of
    drugs 'is the minimum pursuant to the statutory minimum,' its
    actual   sentencing          decision     was      based   purely      on     Guidelines
    considerations        and    the    factors     enumerated        in     18   U.S.C.    §
    3553(a).").
    Either way, neither party can establish the necessary
    prejudice to sustain their claim.                    Following Alleyne, we have
    repeatedly emphasized that no prejudice exists when "it can fairly
    be said . . . that the assigned error did not contribute to the
    result   of    which       appellant    complains,"        and   "[i]n      drug   cases,
    overwhelming evidence of the requisite drug types and quantities
    generally serves as a proxy for determining whether the Alleyne
    error contributed to the result."                  United States v. Morris, 
    784 F.3d 870
    , 874 (1st Cir. 2015) (internal quotation marks and
    citations omitted); see also 
    Ramírez-Negrón, 751 F.3d at 51
    n.8.
    In    this    case,   the    government      established        that   both
    defendants         were    individually     responsible          for   conspiring      to
    distribute more than five kilograms of controlled substances (even
    - 30 -
    excluding the drugs found at Rose's residence).        Some of the
    evidence to establish drug quantity presented at trial included:
    Rose and Frye's agreement to purchase two kilograms of cocaine on
    November 16 (irrespective of the legality of the seizure of those
    drugs); Graham's testimony that he transported a kilogram of
    cocaine for Frye "every three weeks, two a month, every month" for
    a year; Pina and Graham's testimony that they observed both Rose
    and Frye "pressing, cutting, and bagging" kilograms of cocaine for
    distribution; Graham's testimony that he was paid in cocaine by
    Rose and picked up approximately one kilogram of cocaine from Rose
    "plenty" of times; Graham's testimony that Rose ordered him to
    return a kilogram of cocaine because it was "no good"; Graham's
    testimony that he met Ford on four to five occasions at Rose's
    residence to transport cocaine; testimony relating to 200 grams of
    heroin that Frye was expecting for delivery; and testimony from
    another   co-conspirator,   Bonnie   Bearse,   that   Rose   stashed
    significant quantities of cocaine at her house.         Given this
    overwhelming evidence, the defendants cannot establish plain error
    justifying relief.8
    8  Frye also argues that the district court impermissibly
    utilized a prior offense (conspiring to provide contraband to a
    federal inmate, 18 U.S.C. § 371) to move him into the grasp of the
    guidelines' career offender provision.      Although the statute
    pertaining to his prior conviction was divisible, he argues that
    the district court failed to engage in the appropriate analysis to
    determine whether the prior offense was actually a drug crime.
    See Descamps v. United States, 
    133 S. Ct. 2276
    , 2283 (2013);
    - 31 -
    III.
    Finding   no   reason    to      disturb   the   convictions   or
    sentences, we affirm.
    Shepard v. United States, 
    544 U.S. 13
    , 19 (2005). We need not
    determine if an error occurred, since any mistake was harmless.
    First, the career offender classification had no impact on Frye's
    base offense level.   Second, while the offense did move Frye's
    criminal history from category V to category VI, that designation
    ultimately had no impact on the guidelines recommendation, which
    ultimately drove the district court's sentencing decision.
    Indeed, given the severity of the offense, the guidelines still
    recommended 360 months to life, irrespective of Frye's criminal
    history. U.S.S.G. ch. 5, pt. 8.
    - 32 -