United States v. Herbert Green ( 2014 )


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  •                               PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 12-4879
    UNITED STATES OF AMERICA,
    Plaintiff – Appellee,
    v.
    HERBERT GREEN,
    Defendant – Appellant.
    Appeal from the United States District Court for the Western
    District of Virginia, at Roanoke.     Glen E. Conrad, Chief
    District Judge. (7:11-cr-00057-GEC-1)
    Argued:   October 31, 2013                Decided:   January 17, 2014
    Before GREGORY, SHEDD, and KEENAN, Circuit Judges.
    Affirmed by published opinion.    Judge Shedd wrote the opinion,
    in which Judge Gregory and Judge Keenan joined.
    ARGUED: Randy Virlin Cargill, OFFICE OF THE FEDERAL PUBLIC
    DEFENDER, Roanoke, Virginia, for Appellant.       Thomas Ernest
    Booth, UNITED STATES DEPARTMENT OF JUSTICE, Washington, D.C.,
    for Appellee.    ON BRIEF: Larry W. Shelton, Federal Public
    Defender, OFFICE OF THE FEDERAL PUBLIC DEFENDER, Roanoke,
    Virginia, for Appellant.     Timothy J. Heaphy, United States
    Attorney, Ashley B. Neese, Assistant United States Attorney,
    OFFICE OF THE UNITED STATES ATTORNEY, Roanoke, Virginia; Mythili
    Raman, Acting Assistant Attorney General, Denis J. McInerney,
    Acting Deputy Assistant Attorney General, Criminal Division,
    UNITED STATES   DEPARTMENT   OF   JUSTICE,   Washington,   D.C.,   for
    Appellee.
    2
    SHEDD, Circuit Judge:
    A federal grand jury indicted Herbert Green on one count of
    possession with intent to distribute 500 grams or more of a
    mixture    or   substance   containing     cocaine,    in   violation      of    21
    U.S.C.    §§ 841(a)(1)    and    (b)(1)(B).   Before   trial,      Green   moved
    twice to suppress the cocaine, arguing that the police seized it
    in violation of the Fourth Amendment. The district court denied
    both motions, and Green entered a conditional plea of guilty to
    the   charge    against   him,   preserving    the    right   to   appeal       the
    district court’s denial of his suppression motions based on the
    scope and duration of the stop and the reliability of the drug-
    detection dog. The district court sentenced Green to 200 months
    in prison and 5 years of supervised release. For the reasons
    stated below, we affirm the district court’s denial of Green’s
    motions to suppress.
    I.
    In reviewing the denial of a motion to suppress, we review
    the district court’s factual findings for clear error and its
    legal conclusions de novo. United States v. Black, 
    707 F.3d 531
    ,
    537 (4th Cir. 2013). We construe the evidence in the light most
    favorable to the government, as the prevailing party below. 
    Id. at 534.
    The district court found the following facts, which the
    parties do not contest on appeal.
    3
    On the morning of March 17, 2011, Virginia State Police
    Trooper Daryl Johnson executed a traffic stop of Green’s vehicle
    because the windows appeared to be excessively tinted and the
    license       plate    was     partially         obscured.      Before   activating     his
    patrol       car’s    blue     lights       at   approximately      10:07:58,      Trooper
    Johnson       contacted      Trooper        Brian    Dillon,      who    was   driving    a
    separate patrol car, and notified him of his location in case he
    needed assistance.
    At 10:08:35, Trooper Johnson approached Green’s vehicle and
    asked him for his driver’s license and vehicle registration.
    Trooper       Johnson       explained        that    Green’s       license     plate    was
    partially obscured, in violation of Virginia law. He also asked
    Green about the window tint; Green responded that the windows
    were    already       tinted    when    he       bought   the    car.    Trooper   Johnson
    later testified that Green appeared to be excessively nervous
    and that the vehicle contained a strong odor of air freshener
    and had a “lived-in look.”
    At 10:10:30, Trooper Johnson asked Green to accompany him
    to     the    patrol    car     so     he    could    check      Green’s     license    and
    registration on his computer. Upon exiting the vehicle, Green
    mentioned that his lawyer had advised him not to get out of his
    car during traffic stops. Once inside the patrol car, Trooper
    Johnson asked Green why he had a lawyer, and Green responded
    that     he    was     in      the   entertainment           business.       During    this
    4
    conversation, Trooper Johnson began checking Green’s license and
    registration.
    At 10:11:20, Trooper Johnson radioed Trooper Dillon, who
    had parked some distance behind Trooper Johnson, and told him to
    “come   on    up.”        Trooper      Johnson           then    asked      Green   about    his
    itinerary.        Green     responded        that        he     and   his    passenger      were
    driving      to        Pittsburgh     from       Atlanta,         where      they   had     been
    performing shows. At 10:11:35, Trooper Johnson reiterated the
    reasons for the traffic stop.
    At 10:13, Trooper Johnson’s computer program responded to
    his   inquiry,         notifying      him   of       a    concealed      weapons    permit    in
    Green’s name and a protective order against him, both of which
    alerted Trooper Johnson to potential officer safety issues. At
    10:14, dispatch told Trooper Johnson that the concealed weapons
    permit did not belong to Green but confirmed that Green had a
    protective order against him. Trooper Johnson and Green had a
    brief exchange about the protective order and the underlying
    facts, and Trooper Johnson requested additional information from
    dispatch. He again asked Green about his travel plans and the
    identity of his passenger. Green explained that the passenger
    was his recording artist and that they had been in Atlanta for
    eight days.
    Between 10:15 and 10:16, Trooper Johnson told Green that he
    was   going       to    check   the    tint      on      the    vehicle's      windows.     Upon
    5
    exiting    his    patrol         car,   Trooper     Johnson      spoke    with      Trooper
    Dillon, who had arrived on the scene. At 10:16, Trooper Johnson
    approached the front passenger window of Green’s vehicle and
    spoke with the passenger. The passenger informed Trooper Johnson
    that he had been in Atlanta with Green for two weeks, where he
    performed as an R&B singer. During this conversation, Trooper
    Johnson    measured        the    window    tint    and    found   that     it      violated
    Virginia    law.      At    10:17,      Trooper    Johnson      walked    back       to   his
    patrol car and told Green that the window tint was illegal.
    Trooper Johnson then asked Green whether there were any illegal
    drugs in the vehicle. Green stated that there were not, but
    Trooper     Johnson        testified       that    Green       began   breathing          very
    rapidly and appeared to be uncomfortable when Trooper Johnson
    questioned him about illegal drugs. At 10:17:49, Trooper Johnson
    requested a check of Green’s criminal history from dispatch.
    At 10:18, Trooper Johnson asked Green if he had ever been
    arrested.    Green         responded     that      he    had    “beat[en]      up    a    few
    people,” and that he was arrested for narcotics in the 1980s.
    Trooper     Johnson        also     asked    how        long   Green     had     lived     in
    Pittsburgh.      At   10:18:46,         Trooper    Johnson      reiterated       that      the
    window tint was illegal.
    At 10:19, Trooper Johnson left his patrol car to speak with
    Trooper Dillon, telling him that Green had “lawyered up” before
    getting out of his car, that Green was “dirty,” and that Green
    6
    had a “history” but would not tell Trooper Johnson about it. He
    stated that he was checking Green’s criminal history and asked
    Trooper Dillon to perform a free-air sniff of Green’s vehicle
    using Trooper Dillon’s drug-detection dog, Bono.
    At 10:19:42, Trooper Johnson told Green that Trooper Dillon
    was going to conduct an exterior sweep of Green’s vehicle with
    the dog and that he was waiting to hear back from dispatch about
    the   protective    order.        Bono    alerted      to   the    vehicle’s     rear
    passenger panel and completed the free-air sniff at 10:21. When
    Trooper Johnson told Green that Bono had detected the presence
    of narcotics, Green stated that he did not want anyone to search
    the vehicle. Trooper Johnson explained that Bono’s alert gave
    the officers probable cause for a search.
    At 10:21:55, just after Bono completed the sniff, dispatch
    informed Trooper Johnson that Green’s criminal history raised
    multiple   officer     safety       issues       and    included     charges      for
    homicide, carrying concealed weapons, robbery, kidnapping, and
    terroristic threats. At 10:27:05, upon the arrival of a third
    officer,   the     troopers       began       searching     the    vehicle.      They
    discovered a duffle bag containing over one kilogram of cocaine
    and approximately $7,000 in cash.
    After a grand jury returned an indictment charging Green
    with possession with intent to distribute 500 grams or more of
    cocaine,   Green   moved     to    suppress      the    evidence    found   in    the
    7
    vehicle, arguing that the traffic stop was unreasonable in its
    scope    and   duration     and    that    the      delay   was    not   justified      by
    reasonable suspicion of criminal activity. The district court
    denied    Green’s     motion,     holding      that    Trooper     Johnson       did    not
    unreasonably or unnecessarily prolong Green’s detention and that
    Green was lawfully seized for the traffic violation at the time
    the free-air sniff occurred. United States v. Green, 
    2011 WL 6439387
    , at *7 (W.D. Va. Dec. 21, 2011).
    Green then filed a second motion to suppress, arguing that
    Bono’s field performance was so poor that his positive alert did
    not provide probable cause to search the vehicle. The district
    court     denied    this    motion,       concluding        that    “the    record      is
    sufficient to establish Bono’s reliability and, thus, that his
    positive alert provided probable cause to search the defendant’s
    vehicle.” United States v. Green, 
    2012 WL 2924055
    , at *5 (W.D.
    Va. June 28, 2012). On appeal, Green argues that the district
    court erred in denying both motions to suppress.
    II.
    Green argues that the district court erred in denying his
    first motion to suppress because the scope and duration of the
    detention      were      unreasonable,         in    violation      of     his    Fourth
    Amendment      rights.     For    the   following      reasons,     we     reject      this
    contention.
    8
    The Fourth Amendment guarantees “[t]he right of the people
    to   be   secure     in    their   persons,        houses,       papers,    and   effects,
    against     unreasonable       searches        and    seizures.”      The    stop    of    a
    vehicle by the police amounts to a seizure within the meaning of
    the Fourth Amendment. Whren v. United States, 
    517 U.S. 806
    , 809-
    10 (1996).
    A lawful traffic stop “begins when a vehicle is pulled over
    for investigation of a traffic violation” and ends “when the
    police have no further need to control the scene, and inform the
    driver      and   passengers       they    are     free     to    leave.”    Arizona       v.
    Johnson, 
    555 U.S. 323
    , 333 (2009). Because an ordinary traffic
    stop   is    more    analogous     to     an   investigative         detention      than    a
    custodial arrest, we analyze the propriety of a traffic stop
    using the dual inquiry announced in the Supreme Court’s holding
    in Terry v. Ohio, 
    392 U.S. 1
    , 19-20 (1968). United States v.
    Rusher,     
    966 F.2d 868
    ,    875    (4th       Cir.   1992).    Accordingly,         we
    consider first whether the officer’s actions were justified at
    their inception and second whether his subsequent actions were
    reasonably related in scope to the circumstances that justified
    the stop. 
    Id. (quoting Terry,
    392 U.S. at 20).
    Because Green does not contest that the traffic stop in
    this case was justified at its inception, we proceed directly to
    9
    the second prong of the Terry analysis. 1 Green argues that the
    14-minute period of detention between the initial stop and the
    alert by the drug-detection dog was not reasonably related in
    scope to the circumstances that justified the stop. Green cites
    to our decision in United States v. Digiovanni, 
    650 F.3d 498
    (4th Cir. 2011), and argues that the scope and duration of the
    detention      were    unreasonable      because      Trooper    Johnson    used   the
    traffic stop to embark on an unlawful drug investigation.
    In Digiovanni, a police officer initiated a traffic stop
    after observing Digiovanni traveling too close to the car in
    front    of   him,     asked   Digiovanni       for   his   driver’s   license     and
    vehicle       registration,        and   then     “embarked      on    a   sustained
    investigation         into   the   presence     of    drugs,    instead    of   either
    completing the warning ticket or beginning the driver’s license
    1
    Because   “[o]bserving  a   traffic  violation   provides
    sufficient justification for a police officer to detain the
    offending vehicle for as long as it takes to perform the
    traditional incidents of a routine traffic stop,” United States
    v. Branch, 
    537 F.3d 328
    , 335 (4th Cir. 2008), there is ample
    support for the conclusion that this stop was justified at its
    inception. Trooper Johnson testified that he first observed the
    tinted windows on Green’s vehicle, which appeared to violate
    Virginia law. He further explained that he noticed that the
    license plate was partially obscured when he began to call the
    plate into dispatch, but the illegally tinted windows alone were
    sufficient to justify the stop. See Va. Code Ann. § 46.2-
    1052(C)(2) (“No sun-shading or tinting films may be applied or
    affixed to the front side windows of any motor vehicle operated
    on the highways of this Commonwealth that reduce total light
    transmittance of such window to less than 50 percent[.]”).
    10
    check.” 
    Id. at 501-02,
    509-10. The officer did not initiate the
    driver’s license check until after he questioned Digiovanni for
    approximately 10 minutes and returned to his patrol car to radio
    for back-up assistance. 
    Id. at 510.
    Approximately 15 minutes
    into the stop, the officer returned Digiovanni’s license and
    issued him a warning ticket. 
    Id. The officer
    then immediately
    returned    to    the    subject      of     drugs    and    requested     to    search
    Digiovanni’s vehicle. 
    Id. at 504,
    510. We held that the search
    violated Digiovanni’s Fourth Amendment rights because the record
    made it “clear that at just about every turn [the officer] was
    conducting a drug investigation instead of a traffic infraction
    investigation. Indeed, the bulk of the encounter between [the
    officer] and Digiovanni involved a drug investigation . . . .”
    
    Id. at 510.
    As    we    explained      in    Digiovanni,     a     traffic   stop      must   be
    limited in both scope and duration. 
    Id. at 507.
    With regard to
    scope, the officer’s investigative methods should be “the least
    intrusive means reasonably available to verify or dispel the
    officer’s suspicion in a short period of time.” 
    Id. However, questions
    unrelated to the purpose of the traffic stop do not
    necessarily      run    afoul    of    the    scope    component      of   the    Terry
    inquiry. See 
    id. With regard
    to duration, we determine “whether the police
    diligently pursued a means of investigation that was likely to
    11
    confirm or dispel their suspicions quickly, during which time it
    was necessary to detain the defendant.” 
    Id. (internal quotation
    marks     omitted).    Although       the       maximum          acceptable       length     of    a
    routine      traffic       stop     cannot           be    stated      with       mathematical
    precision, 
    Branch, 537 F.3d at 336
    , a stop may become unlawful
    if   “it    is    prolonged       beyond    the          time    reasonably       required        to
    complete [its] mission,” Illinois v. Caballes, 
    543 U.S. 405
    , 407
    (2005).     The    reasonableness          of        a    stop    turns      on   whether     the
    officer’s overall course of action, “viewed objectively and in
    its totality, is reasonably directed toward the proper ends of
    the stop.” 
    Digiovanni, 650 F.3d at 508
    .
    During a routine traffic stop, an officer “may request a
    driver’s license and vehicle registration, run a computer check,
    and issue a citation.” 
    Rusher, 966 F.2d at 876
    . An officer may
    also conduct an exterior dog sniff of the vehicle, as long as it
    is "performed within the time reasonably required to issue a
    traffic citation." 
    Branch, 537 F.3d at 335
    (internal quotation
    marks omitted). To prolong a traffic stop beyond the scope of a
    routine stop, the officer must have either the driver’s consent
    or   a    reasonable       suspicion       of    illegal         activity.        
    Id. at 336.
    However,     where     a    delay    in     conducting             a   dog    sniff     can       be
    characterized        as     de     minimis           under       the    totality        of    the
    circumstances, the delay does not violate the defendant’s Fourth
    12
    Amendment rights. See United States v. Farrior, 
    535 F.3d 210
    ,
    220 (4th Cir. 2008).
    Applying        this    framework,          we    conclude       that    the    district
    court       correctly       held       that    the       traffic      stop      at   issue     was
    reasonable in scope and duration and that Green was lawfully
    seized      for     a   traffic    violation         when       the   dog    sniff     occurred.
    After       initiating      the    traffic          stop,      Trooper      Johnson     promptly
    informed Green that it appeared his window tint and partially
    obscured license plate violated Virginia law, and he asked Green
    for   his      driver’s        license        and    vehicle       registration.         Trooper
    Johnson      asked      Green     to    accompany         him    to   the    patrol     car    and
    immediately began verifying the documents on his computer and
    through       his       dispatcher.       While          waiting      approximately          three
    minutes for a response, Trooper Johnson addressed the grounds
    for the traffic stop and questioned Green about his travel plans
    and his lawyer.
    When dispatch informed Trooper Johnson that Green had a
    protective          order      against        him,        Trooper        Johnson       requested
    additional          information         because,          as     he    explained        at    the
    suppression hearing, the existence of a protective order raises
    officer safety concerns. 2 Trooper Johnson checked the window tint
    2
    Trooper Johnson’s computer program also informed him that
    Green had a concealed weapons permit, but dispatch promptly
    confirmed that the permit did not belong to Green. Although
    (Continued)
    13
    on Green’s vehicle and confirmed that it violated Virginia law
    while    he    waited    for    a    response          about    the    protective       order.
    Trooper Johnson did not immediately issue a citation, but rather
    called     dispatch      and    requested          a    check    of     Green’s     criminal
    history. Trooper Johnson then waited approximately four minutes
    for a response. During that time, Bono completed the exterior
    sniff of Green’s vehicle.
    Trooper Johnson’s brief questioning about matters unrelated
    to   the      traffic   violations       did       not    run    afoul     of     the    scope
    component of Terry’s second prong. See 
    Johnson, 555 U.S. at 333
    (“An     officer’s       inquiries       into          matters        unrelated     to     the
    justification      for    the       traffic    stop . . .         do    not     convert    the
    encounter into something other than a lawful seizure, so long as
    those inquiries do not measurably extend the duration of the
    stop.”);      
    Digiovanni, 650 F.3d at 507
    .    Although      the   criminal
    history check extended the duration of the traffic stop, the
    totality of the circumstances demonstrates that Trooper Johnson
    diligently pursued the purposes of the stop. See 
    Digiovanni, 650 F.3d at 508
    .
    Trooper Johnson requested the criminal history check out of
    concern for officer safety. See 
    id. (“The diligence
    calculus
    concealed weapons permits do signal officer safety concerns, the
    computer’s initial alert does not factor into our analysis.
    14
    includes       an   examination        of . . . whether        the     unrelated
    questioning was conducted out of concern for officer safety.”).
    He did not learn that Green had a protective order against him
    until after he made the initial inquiry into Green’s driver’s
    license and vehicle registration, and he requested the criminal
    history check before receiving additional information about the
    protective      order.    Further,     Trooper      Johnson    testified      that
    Green’s demeanor and behavior throughout the traffic stop in
    conjunction     with     the   protective     order   raised   concerns      about
    officer safety. Given these facts, Trooper Johnson did not act
    unreasonably or unnecessarily prolong Green’s detention.
    Finally, the criminal history check added just four minutes
    to the traffic stop. Under the circumstances, we are convinced
    that such a delay, at most, amounted to a de minimis intrusion
    on   Green’s    liberty    interest     and    thus   did   not   constitute    a
    violation of his Fourth Amendment rights. See 
    Farrior, 535 F.3d at 220
    . We    therefore      hold   that    the   district   court   correctly
    denied Green’s first suppression motion.
    III.
    Green also argues that the district court erred in denying
    his second suppression motion because Bono’s track record in the
    field is not sufficiently reliable for his positive alert to
    provide    probable      cause   to   search    Green’s     vehicle.   For    the
    following reasons, we reject this contention.
    15
    Probable        cause    is   “a       flexible,     common-sense           standard.”
    Texas v. Brown, 
    460 U.S. 730
    , 742 (1983) (plurality opinion). It
    requires only that “the facts available to the officer would
    warrant a man of reasonable caution in the belief that certain
    items may be contraband . . . or useful as evidence of a crime;
    it does not demand any showing that such a belief be correct or
    more likely true than false.” 
    Id. (internal quotation
    marks and
    citations omitted). Probable cause to conduct a search based on
    a drug-detection dog’s alert exists when the totality of the
    circumstances, “viewed through the lens of common sense, would
    make    a    reasonably        prudent     person     think    that       a    search    would
    reveal contraband or evidence of a crime.” Florida v. Harris,
    
    133 S. Ct. 1050
    , 1058 (2013).
    After the district court denied Green’s second suppression
    motion, the Supreme Court in Harris addressed how courts should
    determine whether an alert from a drug-detection dog provides
    probable       cause    to     search     a    vehicle      when    the       defendant    has
    challenged the dog’s 
    reliability. 133 S. Ct. at 1053
    . In that
    case,       Harris   moved      to   suppress       evidence       found      in   his   truck
    during a search based on a drug-detection dog’s alert, arguing
    that the dog was unreliable and thus his alert did not give the
    officer      probable     cause.     
    Id. at 1054.
      Harris     argued       that   the
    alert by the dog was unreliable because on both occasions that
    the dog alerted on his vehicle, the officers were unable to find
    16
    any substances that the dog was trained to detect. 
    Id. at 1058-
    59.     The    Court   rejected    Harris’       contention,      holding      that
    “evidence of a dog’s satisfactory performance in a certification
    or    training    program   can   itself      provide   sufficient     reason   to
    trust    his   alert,”    and   based    on   this    evidence,   “a   court    can
    presume (subject to any conflicting evidence offered) that the
    dog’s alert provides probable cause to search.” 
    Id. at 1057.
    The
    Court explained:
    If a dog on patrol fails to alert to a car containing
    drugs, the mistake usually will go undetected because
    the officer will not initiate a search. Field data
    thus may not capture a dog’s false negatives.
    Conversely (and more relevant here), if the dog alerts
    to a car in which the officer finds no narcotics, the
    dog may not have made a mistake at all. The dog may
    have detected substances that were too well hidden or
    present in quantities too small for the officer to
    locate. Or the dog may have smelled the residual odor
    of drugs previously in the vehicle or on the driver’s
    person. Field data thus may markedly overstate a dog’s
    real false positives. By contrast, those inaccuracies—
    in either direction—do not taint records of a dog’s
    performance in standard training and certification
    settings. There, the designers of an assessment know
    where drugs are hidden and where they are not—and so
    where a dog should alert and where he should not.
    
    Id. at 1056-57.
    Based on this reasoning, the Court held that “in
    most    cases,”    a     drug-detection       dog’s   field   performance       has
    “relatively limited import” and that the better measure of a
    dog’s    reliability      comes   from    his    performance      in   controlled
    testing environments. 
    Id. 17 The
       Court    explained       that    a    defendant       may    challenge    the
    government’s evidence of a dog’s reliability by, for example,
    contesting the adequacy of the drug-detection certification or
    training program or examining how the dog or handler performed
    in the program. 
    Id. at 1057.
    The Court also stated that evidence
    of the dog’s or handler’s previous performance in the field “may
    sometimes be relevant,” but it warned against “inferring too
    much from the failure of a dog’s alert to lead to drugs.” 
    Id. at 1057,
    1059. In Harris, the State introduced substantial evidence
    of   the    drug-detection      dog’s     training         and    his    proficiency   in
    finding drugs. 
    Id. at 1058.
    Harris responded only that the dog’s
    field performance showed that his alert was unreliable. See 
    id. The Court
    held that because the State had “produced proof from
    controlled settings that a dog performs reliably in detecting
    drugs,”     and    Harris    had   failed         to    undermine    that   showing    by
    challenging some aspect of the dog’s training, the officer had
    probable cause to search the defendant’s truck. 
    Id. at 1058-
    59.
    Applying       this    framework,       we       conclude    that   the   district
    court correctly held that Bono was sufficiently reliable and
    that his positive alert provided probable cause for the search
    of   Green’s      vehicle.    Green    presented          Bono’s    field   performance
    reports, which showed that drugs were found only 22 of the 85
    times that Bono had alerted in the field before his alert on
    Green’s vehicle. He argues that, based on this success rate in
    18
    the field of 25.88%, no reasonably prudent person would think
    that a search based on Bono’s alert would reveal contraband or
    evidence of a crime. Although the field performance reports show
    that Bono’s alert in an uncontrolled environment does not always
    result in the discovery of drugs, the district court found that
    Bono’s success rate rises from 25.88 to 43% after factoring in
    the cases in which Bono’s alert did not lead to the discovery of
    drugs but     officers   found   direct    evidence   that      drugs   or   drug
    users had recently been in the vehicle. 3 Moreover, the district
    court correctly determined that, when taking Bono’s training and
    certification record into account, the record is sufficient to
    establish Bono’s reliability.
    As in Harris, the government presented extensive evidence
    of   Bono’s   reliable   performance      in   training   and    certification
    programs, and Green has not introduced any evidence to undermine
    3
    Green argues that these false positives should not be
    considered because the probable cause inquiry focuses on the
    presence of drugs, not the mere odor of drugs. He contends that
    when a drug-detection dog alerts and no drugs are found, that
    dog has not predicted the presence of drugs. But Green
    misapprehends the concept of probable cause. The calculus of
    probable cause deals with the possibility, not the guarantee, of
    criminal conduct. The presence of drug odors is certainly
    relevant to that issue. Moreover, the Supreme Court explained in
    Harris that “[a] well-trained drug-detection dog should alert to
    such [residual] odors; his response to them might appear a
    mistake, but in fact it is 
    not.” 133 S. Ct. at 1059
    . These false
    positive cases are correctly factored into Bono’s success rate
    because he alerted to the odor of drugs as he was trained.
    19
    that showing. Trooper Dillon, Bono’s handler, began working with
    Bono   in     2007,   when   the   pair   completed     a   thirteen-week   drug-
    detection course at the Virginia State Police training academy.
    After completing the course, Bono passed a certification test
    before going out into the field with Trooper Dillon. To keep
    their certification current, Trooper Dillon and Bono complete
    four hours of training each week and 20 hours of in-service
    training each month. The pair has been recertified as a team
    every year since 2007, and Bono has maintained a 100% success
    rate     in     controlled     testing         environments.    Trooper     Dillon
    testified that in controlled testing Bono has never failed and
    has only alerted on vehicles containing drugs or the odor of
    drugs.
    The government also presented testimony from Senior Trooper
    Sydney Scott Settle, a canine trainer for the Virginia State
    Police, who confirmed that Bono has passed all of his annual
    certification tests. Settle testified, based on his experience
    training Bono, that Bono is a reliable drug-detection dog.
    When     considering     Bono’s     field     performance      records   in
    conjunction with his degree of training, his performance during
    training and recertification exercises, and his evaluations by
    Troopers Dillon and Settle, the totality of the circumstances
    establish      Bono’s    reliability      in    detecting   drugs.    Because   the
    government      has     established    Bono’s     reliability   and    Green    has
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    failed to undermine that showing, we agree with the district
    court that Troopers Johnson and Dillon had probable cause to
    search Green’s vehicle. Accordingly, we hold that the district
    court correctly denied Green’s second motion to suppress.
    IV.
    For the foregoing reasons, we affirm the judgment of the
    district court.
    AFFIRMED
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