United States v. Flores , 368 F. App'x 424 ( 2010 )


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  •                              UNPUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 09-4191
    UNITED STATES OF AMERICA,
    Plaintiff - Appellee,
    v.
    ALEJANDRO FLORES,
    Defendant - Appellant.
    Appeal from the United States District Court for the Western
    District of North Carolina, at Asheville.  Lacy H. Thornburg,
    District Judge. (1:08-cr-00073-LHT-1)
    Argued:   January 29, 2010                  Decided:   March 5, 2010
    Before TRAXLER, Chief Judge, NIEMEYER, Circuit Judge, and
    Jackson L. KISER, Senior United States District Judge for the
    Western District of Virginia, sitting by designation.
    Affirmed by unpublished per curiam opinion.
    ARGUED: Andrew Brady Banzhoff, Asheville, North Carolina, for
    Appellant.    Amy Elizabeth Ray, OFFICE OF THE UNITED STATES
    ATTORNEY, Asheville, North Carolina, for Appellee.    ON BRIEF:
    Edward R. Ryan, Acting United States Attorney, Charlotte, North
    Carolina, for Appellee.
    Unpublished opinions are not binding precedent in this circuit.
    PER CURIAM:
    Alejandro Flores (“Flores”) pled guilty to possession with
    intent    to    distribute          at    least       five    kilograms    of     cocaine   in
    violation of 
    21 U.S.C. § 841
    (a)(1) and received a sentence of
    seventy months of imprisonment and three years of supervised
    release.       Flores’s guilty plea was conditional pursuant to Rule
    11(a)(2) of the Federal Rules of Criminal Procedure and reserved
    his right to appeal the district court’s denial of his motion to
    suppress all evidence seized from the search of his vehicle and
    trailer.       On appeal, Flores argues that the trial court should
    have granted his motion because the stop of his vehicle and
    ensuing search violated the Fourth Amendment.                             For the reasons
    that follow, we conclude that the search and seizure of Flores’s
    vehicle and trailer was consistent with Constitutional mandates.
    Specifically,      we        find   that       the    entire    search    was     within    the
    scope of Flores’s consent and that the troopers had probable
    cause to conduct the search even absent consent.                                Accordingly,
    we affirm.
    I. Facts
    On    June        10,    2008,       at    approximately          11:00    a.m.,   North
    Carolina       State    Highway          Patrol       Trooper    Ray    Herndon    (“Trooper
    Herndon” or “Herndon”) was on stationary patrol on Interstate 40
    in Haywood County, North Carolina.                           He observed Flores’s white
    2
    Ford       Bronco      traveling      east,     and    as    the     vehicle     approached
    Trooper Herndon, Flores braked sharply, causing his vehicle to
    travel to the right of the white fog line and nearly collide
    with       the    bridge    rail. 1        As   the       Bronco     passed     Herndon      at
    approximately sixty miles per hour, the trooper observed Flores
    “sitting very fixed and rigid” in his seat and tightly grasping
    the steering wheel.             Although Herndon acknowledged that everyone
    is nervous during a traffic stop, he described Flores’s reaction
    to seeing him as “extreme.”                     The trooper pursued Flores and
    observed         the   Bronco     travel      across      the      fog   line    once    more,
    traverse back into its lane, and then cross the dotted center
    line.        After      following      Flores       for     approximately        two    miles,
    Herndon initiated a vehicle stop at 11:05 a.m.
    Approaching the vehicle on the passenger side, the trooper
    noticed “greasy smudges all over the white rims” of the two-
    wheel trailer affixed to the Bronco.                        He also observed that the
    lug nuts appeared to have been worn to the point they were very
    shiny, as if they had been taken off and put on numerous times.
    The    flat      bed    trailer    contained        only     a     spare   tire,       and   the
    tailgate         was   wired    shut.         Although       the    Bronco      displayed      a
    Colorado license plate, the trailer had an Arizona registration
    plate.
    1
    The bridge railing at that section of the highway was
    approximately one and a half to two feet from the fog line.
    3
    In the cabin, Trooper Herndon observed Flores sitting in
    the   driver’s      seat,    an    adult    female      sitting     in    the   passenger
    seat, and a juvenile female with a dog seated in the back.
    Herndon asked for Flores’s license and registration, at which
    point    he     observed         that   Flores’s        hands      were     shaking    so
    dramatically        that    he    repeatedly      fumbled     in    his    attempts    to
    retrieve      his   driver’s      license       from    his   wallet.        Flores   was
    breathing out of his mouth as if out of breath, and the whole
    side of his neck was visibly pounding with a rapid pulse.                             The
    adult female passenger opened the glove box to search for the
    vehicle’s registration, and Trooper Herndon noticed her hands
    were also visibly shaking, and she appeared to have a rapid
    pulse    as   well.        The    trooper    was       alarmed     by    this   behavior,
    particularly the extent of nervousness of the female passenger,
    because such passengers are not typically nervous during traffic
    stops.     Sensing something was not right, Herndon asked Flores to
    join him at the rear of the vehicle.                     After obtaining consent,
    the trooper patted Flores down for weapons and noted Flores’s
    heart was racing “as if he had been exercising heavily.”
    Trooper Herndon advised Flores he had stopped him because
    he was “all over the road,” and the two had a brief conversation
    in    English    about      Flores’s    lane      violations.            Afterward,   the
    trooper asked Flores to sit in the front passenger seat of his
    patrol car while he checked Flores’s license and registration.
    4
    Although    there       was   no    problem        with    Flores’s    license         or   the
    registration       on    the       Bronco,     the        Arizona    trailer       was      not
    registered under Flores’s name or the name provided by Flores. 2
    Trooper Herndon notified Flores he would only receive a warning
    for   his   lane    violations,          but   Flores       continued       to   exhibit      a
    “[h]eightened      state      of    nervousness,”          thereby    further      arousing
    the trooper’s suspicions.
    After    Herndon        returned    Flores’s         license    and    registration
    and issued him a copy of the warning, the trooper asked Flores
    if he could ask him some questions before he left.                                     Flores
    agreed, and Herndon posed some general inquiries about where
    Flores was going and why, to which Flores replied they were
    traveling     to   somewhere        in   North      Carolina    to    move       the   female
    passenger’s uncle’s belongings to Colorado.                           Flores could not
    identify the destination city in North Carolina or the uncle’s
    name.     He did, however, indicate they would be moving all of the
    uncle’s     belongings,         including          sofas,     couches,       and       tables,
    despite the trooper’s opinion that the five foot by twelve foot
    trailer could not reasonably accommodate that many items.
    Increasingly suspicious, Herndon asked Flores if he could
    speak with the adult female passenger, whom Flores identified as
    2
    Before Trooper Herndon checked the registration, Flores
    identified an individual named “Juan” as the owner of the
    trailer.    Trooper Herndon’s check revealed it was actually
    registered to “a Pablo something.”
    5
    “Marilena        or    Marilyn,”    his     girlfriend    of      “five,       six,   seven
    years.”         Flores agreed, and the trooper proceeded to the Bronco,
    where the female passenger identified herself as Nereyda Mendez
    (“Mendez”). 3          Mendez confirmed that she was Flores’s girlfriend
    and that they were traveling to a location in North Carolina to
    pick up furniture to move to Colorado.                      Mendez identified the
    owner of the furniture as her cousin, though, and when asked for
    his    or       her    name,    Mendez      responded     with      a     blank       stare.
    Eventually, Mendez articulated they were traveling to Lumberton,
    North Carolina, but she was not able to produce a name for the
    cousin.         Throughout the conversation, Trooper Herndon continued
    to    notice      “a   quick,     rapid   pounding    pulse”      in     Mendez’s     neck,
    which the trooper found abnormal.
    Herndon         returned     to    his    patrol     car     to     discuss      the
    inconsistencies           between         Flores’s    and      Mendez’s           stories.
    Ultimately, the trooper explained to Flores that he suspected
    them       of    possessing       illegal       contraband,       and     he    requested
    permission to search Flores’s vehicle.                    Flores consented, both
    orally and in writing. 4                 Flores inquired whether the trooper
    would damage the vehicle in the search, and Herndon said he
    3
    “Marilyn or Marilena” turned out to be the name of the
    young girl seated in the back of the Bronco.
    4
    Trooper Herndon used a printed “consent to search” form
    that included Flores’s information, the vehicle information, and
    the trailer information.   The Trooper did not read the form to
    Flores or advise him of any rights in relation to the form.
    6
    would not, but “if [he] did damage it accidentally or something,
    . . . [the Highway Patrol] would take care of the damage.”
    Herndon    then   requested       assistance,      and    Trooper    Michael     Hicks
    (“Trooper    Hicks”)      arrived    shortly    thereafter        to   aid     in   the
    search.
    During the search, Flores remained in Herndon’s patrol car.
    Trooper Hicks stood by the patrol car door with Mendez, the
    juvenile child, and the dog.              No one was handcuffed.               Trooper
    Herndon started by searching the Bronco.                   Despite the parties’
    explanation about traveling across the country, Trooper Herndon
    found no luggage.           The trooper then proceeded to examine the
    trailer.     Herndon noticed that the lug nuts on the driver’s side
    were shiny, just as on the passenger side, and there were greasy
    smudges on the rims, just like on the other side.                      The floor of
    the trailer was “very thin” and had no reinforcement, and the
    axles   “appeared      to    be   extremely     large”      for     such   a    small,
    lightweight trailer.          Herndon laid on the ground to examine the
    axles further, and he observed several locations with new bolts
    and greasy handprints.            Trooper Herndon’s examination convinced
    him the shackles had been removed many times, and the axles
    “obviously    .   .   .     had   been   apart.”         This   further    increased
    Herndon’s suspicions, as trailer axles do not typically require
    much maintenance.           Because of his training and experience in
    drug interdiction, the trooper was aware that axles are a common
    7
    place to conceal contraband due to their being hollow.                            Based on
    this information--as well as the parties’ nervousness and their
    vague and conflicting stories--he “became quite confident that
    the axles likely contained some kind of illegal contraband.”
    Trooper      Herndon      determined    he    could       not   conduct        further
    inspection of the axles at the roadside, so he asked Mendez if
    she would be willing to travel with the troopers to the next
    exit so they could continue searching for contraband.                                 Herndon
    then   asked       Mendez   to    assist   him      in    explaining       to    Flores    in
    Spanish what Herndon wanted to do.                   Although Flores had spoken
    “perfect English” that day, Herndon believed the conversation
    was becoming more complex, and he wanted to make “double sure”
    Flores     understood.            After    Mendez        finished      explaining         the
    situation, Flores consented to the additional search.                                 Flores
    then drove the Bronco to a Pilot truck stop service bay at the
    next exit.          Herndon asked Trooper Hicks to accompany Flores,
    Mendez, and the juvenile child to the Pilot store and to the
    restroom      if    they    wished    while      Herndon         examined       the   axles.
    According to Herndon, Flores, Mendez, and the child were free to
    move about.
    Upon    closer       inspection,       Trooper      Herndon      confirmed         the
    presence      of    the    greasy   handprints,          shiny    bolts,    new       shackle
    bolts, and other evidence the axles had been tampered with and
    removed.      He determined the quickest, least intrusive, and most
    8
    efficient way to investigate would be to drill a small hole in
    the axle, as that would not damage its functionality.                         Using a
    5/16   inch     drill   bit,    Herndon    drilled      a    hole    into   the   axle
    approximately one foot from the right side.                     Although the axle
    should have been hollow, the trooper encountered another sleeve
    inside the axle.          According to Trooper Herndon, this sort of
    inner sleeve is often used by smugglers to facilitate ease of
    insertion      and    removal    of   contraband       inside   an    axle.       Upon
    drilling into the inner sleeve, the trooper noticed a white,
    powdery substance on the end of his drill, and he immediately
    smelled cocaine.        A field test revealed the substance was indeed
    cocaine.       When Flores and Mendez returned from the Pilot store,
    Herndon arrested them.           Further inspection of the axle revealed
    eighteen bundles of cocaine, which weighed out to a total of
    approximately nine kilograms.
    After    a    suppression      hearing,   the    district      court    denied
    Flores’s motion to suppress evidence obtained as a result of the
    search and seizure of Flores and his vehicle.                       Judge Thornburg
    first determined that Trooper Herndon’s initial stop of Flores
    was proper because there was probable cause to believe Flores
    violated    North     Carolina     traffic    law.      By    state   statute,     law
    enforcement personnel may issue warning tickets for conduct that
    may potentially cause harm to the public.                   Since Trooper Herndon
    observed Flores cross the fog line twice and center line once,
    9
    the stop was proper.            Second, Judge Thornburg ruled that the
    “numerous      conversations        between        Trooper    Herndon        and     Flores
    established” that Flores’s consent was knowingly and voluntarily
    given, including the consent to move the Bronco to a second
    location for further searching.                  The Judge found Flores could
    readily understand and respond to the trooper’s questions and
    pose his own, and Trooper Herndon did not employ a menacing or
    intimidating tone.          Judge Thornburg further determined that the
    trooper’s     failure      to   notify      Flores    of     his     right     to    refuse
    consent      did    not   vitiate     the    voluntariness         of    his       consent.
    Third, the district court held that drilling a hole in Flores’s
    axle   did    not    exceed     the   scope      of   consent.          Given       Trooper
    Herndon’s explicit questions about drugs, the Judge concluded a
    reasonable person would have understood that the trooper was
    asking for consent to search the entire vehicle and trailer for
    contraband.          Although    Flores      inquired        about    damage        to   the
    vehicle,     he    did    not   object      when    the    trooper      mentioned        the
    possibility the Highway Patrol might have to repair some damage,
    so he did not limit his consent.                   Furthermore, drilling a small
    hole was a reasonable method of conducting the search, as the
    likely alternative would have required the troopers to prolong
    the search by completely dismantling the axle.                          Finally, Judge
    Thornburg determined Trooper Herndon, based on his training and
    10
    experience, had probable cause to search the axle and employed
    the least intrusive method of doing so.
    II. Analysis
    In   reviewing   a   trial   court’s   denial   of   a   motion    to
    suppress, this Court reviews factual findings for clear error
    and legal determinations de novo.       Ornelas v. United States, 
    517 U.S. 690
    , 699 (1996); United States v. Mowatt, 
    513 F.3d 395
    , 399
    (4th Cir. 2008); United States v. Hamlin, 
    319 F.3d 666
    , 671 (4th
    Cir. 2003).
    A. Legality of the Stop
    Flores argues the district court erred in determining that
    Trooper Herndon’s initial stop was consistent with the Fourth
    Amendment.    Flores acknowledges the traffic offense of “Failing
    to Maintain a Lane,” codified as follows: “A vehicle shall be
    driven as nearly as practicable entirely within a single lane
    and shall not be moved from such lane until the driver has first
    ascertained that such movement can be made with safety.”               
    N.C. Gen. Stat. § 20-146
    (d)(1) (2008).       Flores asserts, however, that
    crossing the fog line twice and the center line once does not
    amount to a violation of section 146(d)(1).          In support of his
    argument, Flores relies on United States v. Gregory, 
    79 F.3d 973
    (10th Cir. 1996), a case in which the Tenth Circuit examined a
    11
    similar      Utah        statute     and    concluded        that    weaving       into    the
    emergency         lane    once     was     not    a     traffic     violation      providing
    probable cause for search and seizure.                          Therefore, according to
    Flores,      Trooper       Herndon       lacked        probable     cause    to    make    the
    initial      stop.         Alternatively,         Flores        asserts     that    no    North
    Carolina appellate case has concluded that crossing the fog line
    constitutes a violation of section 146(d)(1).
    The Government responds that Flores’s swerving off the road
    amounted to a violation of section 20-146(d)(1).                            Based on State
    v. Baublitz, 
    172 N.C. App. 801
    , 
    616 S.E.2d 615
     (N.C. Ct. App.
    2005), and United States v. Gallardo-Gonzales, No. 08-4284, 
    2009 WL 1426907
     (4th Cir. May 22, 2009), the Government argues that a
    stop    based      on     a   “readily       observable”          traffic    violation      is
    supported by probable cause.                     Alternatively, even if crossing
    the fog and center lines was not sufficient to provide probable
    cause,      the    Government        asserts      that     the     trooper’s       subjective
    belief that criminal activity might have been afoot, based on
    the totality of the circumstances known to the trooper, rendered
    the stop reasonable.
    It    is    well-established          that        “the    decision     to    stop    an
    automobile is reasonable where the police have probable cause to
    believe that a traffic violation has occurred.”                           Whren v. United
    States, 
    517 U.S. 806
    , 809-10 (1996).                        In other words, “‘[w]hen
    an   officer       observes      a   traffic          offense--however       minor--he      has
    12
    probable cause to stop the driver of the vehicle.’”                                      United
    States v. Hassan-El, 
    5 F.3d 726
    , 730 (4th Cir. 1993) (quoting
    United States v. Cummins, 
    920 F.2d 498
    , 500 (8th Cir. 1990)).
    Additionally, pursuant to state and federal precedent, when a
    North Carolina patrol trooper observes a driver swerving out of
    his or her lane, the trooper has probable cause for a stop.                                   See
    Gallardo-Gonzales,             
    2009 WL 1426907
    ,       at        *1    (holding        that
    Gallardo-Gonzales’s            “readily      observable”       violation            of   section
    20-146(d) provided the officer with probable cause to effectuate
    a stop); Baublitz, 172 N.C. App. at 807, 
    616 S.E.2d at 619
    (concluding that the investigator’s two observations of Baublitz
    crossing the center line of a highway in violation of section
    20-146(a) supplied probable cause for the stop).
    Based      on    the    precedent,      there    can    be        little      doubt    the
    district       court     was       correct     in    ruling        Trooper      Herndon        had
    probable cause to stop Flores.                      When Flores first noticed the
    trooper, his Bronco suddenly swerved right of the fog line and
    nearly collided with the bridge railing.                            The trooper pursued
    Flores and observed two additional instances of his inability to
    maintain a single lane.                Although Flores appears to be correct
    that   no    North       Carolina      state     appellate         court      has    addressed
    whether     this       sort   of     conduct    constitutes         a    violation       of    the
    statute,     at    least       one    unpublished      case    from          this   Court     has
    concluded, with little difficulty, that a single incident of
    13
    crossing over the fog line is a violation of that section.                               See
    Gallardo-Gonzales,           
    2009 WL 1426907
    ,        at    *1.      Moreover,      the
    absence of state precedent on the matter may simply be due to
    the fact that the language found in section 20-146(d)(1) is so
    clear that there can be little doubt that swerving in and out of
    a lane constitutes a violation of the statute unless additional
    circumstances         make   maintenance         of    a   single      lane    impractical.
    See    §    20-146(d)(1).           In    any    event,     Flores’s      three     readily
    observable       traffic     infractions             permitted    Trooper      Herndon    to
    effectuate a stop consistent with the Fourth Amendment.                                  See
    Whren, 
    517 U.S. 816
    ; Gallardo-Gonzales, 
    2009 WL 1426907
    , at *1;
    Baublitz, 172 N.C. App. at 807, 
    616 S.E.2d at 619
    ; see also 
    N.C. Gen. Stat. § 20-183
    (b) (2008) (authorizing law enforcement to
    issue warning tickets for conduct that could harm the public).
    Flores’s reliance on the Tenth Circuit’s opinion in United
    States v. Gregory is misplaced.                       Although the Utah statute in
    Gregory is similar to section 20-146(d), 5 the facts presented are
    substantially different.                 In ruling that the officer did not
    have       probable     cause       to    stop       Gregory,     the     Tenth    Circuit
    emphasized that Gregory’s single lane crossing was likely due to
    the    winding    road,      mountainous         terrain,       and    windy   conditions.
    5
    In Gregory, the court interpreted Utah Code section 41-6-
    69(1), which provides that “[a] vehicle shall be operated as
    nearly as practical entirely within a single lane and may not be
    moved from the lane until the operator has determined the
    movement can be made safely.” Gregory, 
    79 F.3d at
    976 n.2.
    14
    Gregory, 
    79 F.3d at 978
    .              The court noted that the Utah statute
    only requires a vehicle to remain in a single lane “as nearly as
    practical” and concluded that, “[u]nder these conditions[,] any
    vehicle could be subject to an isolated incident of moving into
    the right shoulder of the roadway[] without giving rise to a
    suspicion of criminal activity.”                 
    Id.
     (emphasis added).          Unlike
    in Gregory, the present case presents no indication that weather
    or road conditions made it impractical for Flores to maintain a
    single lane.           Moreover, unlike Gregory, Trooper Herndon observed
    Flores      swerve      out   of    his   lane   three    times,   not   just    once.
    Gregory is therefore distinguishable from the present facts, and
    nothing on the record indicates the district court erred in fact
    or   law     in    holding    that    probable    cause    supported     the   initial
    stop.
    B. Consent to Search and Seize
    Flores next argues that Trooper Herndon did not have valid
    consent      to    search     the    vehicle     and   trailer.     First,      Flores
    maintains that Herndon should have let Flores go after returning
    Flores’s license and registration and issuing him a ticket, as
    Flores’s nervousness was not sufficient to create a reasonable
    suspicion         of   additional     criminal     activity. 6     Second,      Flores
    6
    According to Flores, “[t]he Trooper later acknowledged
    that       the defendant’s status as an illegal alien might have
    15
    asserts that the language employed by Trooper Herndon to ask
    Flores if he could pose additional questions was “coercive and
    confusing”    and     conditioned   Flores’s      freedom   to   leave   on   his
    willingness to answer questions. 7               According to Flores, this
    rendered Flores’s continued detention involuntary and vitiated
    his consent.     Third, Flores argues that “the physical appearance
    of   the   officer,    including    his    all   black   para-military     style
    outfit[] and his physically imposing size provided an inherently
    coercive atmosphere . . . .” 8            When coupled with the fact that
    Trooper Herndon did not advise Flores of his rights or ability
    to   refuse    consent,    this     further      rendered   Flores’s     consent
    accounted for his nervousness.”  This reading of the testimony
    is patently incorrect.    The portion of the record cited by
    Flores reads as follows:
    Q. Would you agree, wouldn’t you, that if he was in
    this country illegally, that certainly would account
    for that nervousness[?]
    A. You want my opinion? Is that what you’re asking?
    Q. Well, I mean—
    A. I don’t necessarily agree with your broad statement
    there, no.
    Q. If he is an illegal alien, that certainly would
    make him nervous in the presence of a law enforcement
    officer, wouldn’t [it]?
    A. Well, that would depend on the illegal alien.
    Everybody is different.
    7
    Trooper Herndon testified that he wrote in his report: “I
    asked Mr. Flores if I could ask him some questions before he
    left.”
    8
    Flores’s Brief details Trooper Herndon’s clothing, height,
    and weight on the date in question. The description appears to
    match that of a normal highway patrol officer and does not
    present anything even arguably out of the ordinary.
    16
    involuntary.       Flores argues he would not have subjected himself
    to the “embarrassment and humiliation” of traveling by police
    escort to the truck station but for his belief he was not free
    to decline.
    The Government counters that the evidence reveals Flores
    knowingly    and    voluntarily        consented      to    the     searches      of    his
    vehicle, including both the initial search and the later search
    at the truck station.            Relying on several Fourth Circuit cases,
    the   Government     argues      Herndon’s     return       of    Flores’s       driver’s
    license and registration was a crucial moment separating the
    compulsory    portion      of    the   stop    from     the      voluntary       portion.
    According    to    the    Government,      once    Herndon        returned       Flores’s
    driver’s    license      and    registration      and      issued    a    warning,      the
    trooper’s    language      and    conduct     would     have      led     a    reasonable
    person to believe any further questioning was voluntary.                              Under
    these   circumstances,          Flores’s      explicit,          verbal       consent    to
    additional     questioning         prevents       the      conclusion          that     the
    continued inquiry violated the Fourth Amendment.                         The Government
    notes, based on Fourth Circuit precedent, that advising Flores
    of his right to refuse consent was not a prerequisite to it
    being voluntary.         The Government further asserts that Flores’s
    statements and conduct--including the fact that Flores helped
    the troopers move the Bronco and trailer to the truck station
    with knowledge of Trooper Herndon’s specific suspicions--provide
    17
    ample proof of his consent to the later search.                            Finally, the
    Government points out that the district court found no evidence
    of    coercion.        Therefore,        based   on     the        totality     of     the
    circumstances, the Government maintains that the lower court’s
    decision should be upheld.
    Even where an initial stop is justified by probable cause,
    after satisfying the purpose for which the stop was made and
    issuing   a   citation     or     warning,     the   officer        must    permit     the
    driver to proceed on his way without further delay, and any
    continued     detention      for       questioning      is     illegal        absent     a
    reasonable     suspicion     of    a   serious   crime.            United    States     v.
    Foreman, 
    369 F.3d 776
    , 781 (4th Cir. 2004); United States v.
    Rusher, 
    966 F.2d 868
    , 876-77 (4th Cir. 1992).                       In circumstances
    where the individual would be free to go but voluntarily stays
    and   engages     in   a   dialogue      with    the    officer,       however,        the
    questioning is considered consensual and does not trigger Fourth
    Amendment scrutiny.        United States v. Meikle, 
    407 F.3d 670
    , 672-
    73 (4th Cir. 2005).         This exception applies where “a reasonable
    person would have felt free to decline the officer’s request or
    otherwise     terminate    the     encounter.”         
    Id. at 672
    .      Likewise,
    although a warrantless search conducted without consent is per
    se unreasonable, voluntary consent to search is an exception to
    that general rule.         Schneckloth v. Bustamonte, 
    412 U.S. 218
    , 219
    (1973).     In examining whether consent was freely and voluntarily
    18
    given, the court must consider the totality of the circumstances
    surrounding the consent, including the age, maturity, education,
    intelligence, and experience of the defendant, as well as the
    conditions under which the consent was given.                              United States v.
    Lattimore, 
    87 F.3d 647
    , 650 (4th Cir. 1996).                                The question of
    voluntariness of consent is a factual question, and the district
    court’s      conclusion         should       be       upheld     unless    the     finding    is
    clearly erroneous.              
    Id.
        Where the lower court “bases a finding
    of consent on the oral testimony at a suppression hearing, the
    clearly     erroneous       standard         is        particularly       strong    since     the
    [court]     had     the    opportunity            to    observe    the     demeanor    of    the
    witnesses.”       
    Id. at 650-51
     (internal quotation omitted).
    In    this      case,     the       district       court’s     determination         that
    Flores      voluntarily         consented         to     Trooper     Herndon’s       continued
    questioning       is      not    clearly         in     error.      In     fact,    this     case
    presents an almost identical set of facts to those in Meikle.
    In    Meikle,       as    here,       an    officer       stopped     the    defendant       for
    crossing the fog line and became suspicious about drugs due to
    the    defendant’s         “extreme         nervousness,”          which    continued       even
    after the officer notified the defendant he would only receive a
    warning.        
    407 F.3d at 671
    .                   After returning the defendant’s
    license and registration and issuing the warning, the officer
    “asked [the defendant] if he could talk to him again,” and the
    defendant replied “yes.”                   
    Id.
            We there concluded that, having
    19
    reacquired      his    license       and    registration     and        received   the
    warning, a “reasonable person would have felt free to decline
    [the officer’s] request to speak” further, despite the officer’s
    failure to explicitly say that the defendant was free to go or
    that he could refuse consent.              
    Id. at 673
    .      In the present case,
    the district court found that Trooper Herndon posed his request
    for further questioning in a manner similar to the officer in
    Meikle, and Flores replied with an affirmative “yes.”                           As in
    Meikle,   the     trooper’s    language,         coupled   with    the    surrounding
    circumstances, would inform a reasonable person that he or she
    could refuse consent.          Nothing in the record indicates that the
    trooper    used    a   menacing      or    intimidating     tone,       and   Flores’s
    description of Herndon’s physical appearance does not seem out
    of the ordinary in any respect.                  At the time Herndon requested
    the    opportunity     for    additional         questioning,     the    trooper   had
    already returned Flores’s license and registration, so Herndon
    was not withholding or restricting Flores’s means of going about
    his business.       See United States v. Weaver, 
    282 F.3d 302
    , 310-11
    (4th   Cir.   2002)     (describing        the    significance     of    returning   a
    defendant’s license and registration).                 Although Herndon did not
    notify Flores of his right to refuse consent, “the Government
    need not demonstrate that the defendant knew of his right to
    refuse    consent      to    prove    that       the   consent    was     voluntary.”
    20
    Lattimore, 
    87 F.3d at 650
    . 9             Based on all of these factors, the
    district     court       did    not   err    in     finding    Flores     voluntarily
    consented to the questioning.
    Nor can it be said the district court erred in concluding
    Flores consented to the initial search of his vehicle and the
    later     search    at    the    truck      station.        Contrary     to    Flores’s
    argument    that     Trooper      Herndon    employed       confusing     language    to
    elicit    consent,       it    appears   the      trooper   went    to   considerable
    lengths to ensure Flores understood exactly what the officer was
    asking.      Prior       to    requesting      permission     to    search,     Herndon
    specifically inquired whether Flores was carrying illegal drugs
    “such as marijuana, cocaine, methamphetamine, [or] heroin” in
    his   vehicle.       The       trooper   then     explained    that      he   suspected
    Flores of engaging in criminal activity and requested permission
    to search Flores’s vehicle for contraband.                    Only after this did
    Flores    provide     consent--both         verbally    and    in   writing--to      the
    search.     Even if Flores’s English reading skills were limited in
    9
    The Supreme Court elaborated on this point in Ohio v.
    Robinette, 
    519 U.S. 33
     (1996):
    “While knowledge of the right to refuse consent is one
    factor to be taken into account, the government need
    not establish such knowledge as the sine qua non of an
    effective consent . . . .       [S]o too would it be
    unrealistic to require police officers to always
    inform detainees that they are free to go before a
    consent to search may be deemed voluntary.”
    
    Id. at 39-40
    .
    21
    some degree, as Flores argued before the district court, he was
    able     to     converse       in    perfect           English     with      Trooper        Herndon
    throughout their numerous conversations.                               He demonstrated his
    ability        to     understand      the        trooper’s       questions          and    respond
    appropriately.            By    asking          whether      Herndon        would    damage     his
    vehicle in the search, he further established he was able to
    pose questions of his own.                      At the very least, Flores’s verbal
    consent to the initial search was free, voluntary, and knowingly
    provided,       and     nothing      in     the    record        or     testimony         indicates
    Flores was confused about what the trooper was asking.
    Moreover,        when    Herndon          concluded       he     could      not     properly
    search    the        vehicle   on    the        side    of   the      highway,       he    employed
    Mendez’s       Spanish-speaking            skills        “to     make       double    sure    that
    [Flores]       understood”          what    the        trooper     was       asking.         Flores
    unequivocally responded that “that was fine,” and the troopers
    could do “whatever [they] needed to do.”                              To further evince his
    consent, Flores then proceeded to drive his Bronco and trailer
    to the truck stop, park it in the service bay, and exit the
    vehicle so the trooper could continue his search.                                   Based on all
    of     these        circumstances,         as     established          at    the     suppression
    hearing through Trooper Herndon’s testimony, the district court
    did not commit clear error in finding Flores consented to both
    searches.
    22
    C. Scope of Consent and Probable Cause to Search
    In his third assignment of error, Flores argues that he
    limited his consent by requesting that the troopers not damage
    his vehicle.      Because of this, Flores asserts that Herndon could
    only have drilled into his axle if they had probable cause,
    which    Flores    maintains     they   lacked.         According    to    Flores,
    although Trooper Herndon testified at length about the axles not
    appearing to be “factory axles,” that created nothing more than
    an    inarticulable    hunch     insufficient     to    form    probable    cause.
    Relying on case law from other Circuits, Flores argues that,
    although the axles could be capable of holding contraband, the
    troopers did not have any additional specific facts indicating a
    fair    probability    that    drugs    would   be     found    therein,   thereby
    depriving them of probable cause.
    The     Government      responds       with      three     justifications
    supporting the district court’s conclusion that the troopers did
    not exceed the scope of Flores’s consent.                First, the Government
    argues that Flores did not limit the scope of his consent; he
    simply inquired whether the troopers would damage his vehicle in
    the search.        When Trooper Herndon responded that the Highway
    Patrol would take care of any damage that occurred, Flores did
    not    object,    thereby     demonstrating     his    satisfaction       with   the
    trooper’s answer.           Second, the government maintains that, in
    driving his Bronco and trailer to a truck stop mechanic’s bay,
    23
    Flores understood the troopers would be looking for drugs in
    hidden areas, including the axles.                  By going along with this,
    Flores’s conduct bolsters the conclusion that the search of the
    axles was within the scope of his consent.                              Third, even if
    Flores    limited   the    scope    of   his    consent         by     inquiring     about
    damage, the Government asserts that drilling the axles did not
    exceed the limitation, as the small drill hole did not impair
    the functionality of the axles in any way.
    Where   a   defendant    argues     that       law    enforcement          officers
    exceeded his or her consent, “[t]he standard for measuring the
    scope of . . . consent under the Fourth Amendment is that of
    ‘objective’    reasonableness--what           would       the    typical      reasonable
    person have understood by the exchange between the officer and
    the   suspect?”      Florida   v.    Jimeno,        
    500 U.S. 248
    ,   251   (1991)
    (citing   Illinois    v.   Rodriguez,         
    497 U.S. 177
    ,    183-89      (1990),
    Florida v. Royer, 
    460 U.S. 491
    , 501-02 (1983), and 
    id. at 514
    (Blackmun, J., dissenting)); see also United States v. Neely,
    
    564 F.3d 346
    , 350 (4th Cir. 2009).                  In this case, the district
    court correctly concluded that a reasonable person in Flores’s
    position would have understood he was consenting to a search of
    the trailer’s axles.         Flores inquired whether the search would
    cause any damage to his vehicle, and Trooper Herndon notified
    him of that possibility.            Only after that notice did Flores
    execute the written consent to search form, thereby consenting
    24
    with   full   awareness    that     the    troopers    might      look   within   the
    axles.    Additionally, when Trooper Herndon asked for additional
    consent to move the vehicle to the Pilot station, he explicitly
    stated the reason he wished to do so: he wanted to conduct a
    “closer inspection of the trailer axles because [he] suspected
    they contained some kind of contraband.”                   At the point Flores
    again consented, he was conscious to both the possibility of
    damage and the trooper’s interest in the contents of the axles.
    In other words, based on the trooper’s numerous explanations, at
    the time Flores consented to the continued search, a reasonable
    person would have known what the search would entail.
    In addition, the district court did not err in finding that
    Trooper   Herndon,    based    on    his       training    and    experience,     had
    probable cause to search the axle.                 If an officer has probable
    cause to believe a suspect is engaged in criminal activity, the
    officer may search the suspect’s vehicle even absent consent or
    a warrant.     United States v. White, 
    549 F.3d 946
    , 949 (4th Cir.
    2008).    Probable cause exists where “there is a fair probability
    that   contraband    or   evidence        of   a   crime   will    be    found   in   a
    particular place.”        Illinois v. Gates, 
    462 U.S. 213
    , 238 (1983).
    In evaluating whether the officer had probable cause, courts
    examine the totality of the circumstances.                   White, 
    549 F.3d at 949
    .
    25
    Although there does not appear to be any Fourth Circuit
    precedent     with     analogous          facts,      case     law     from      other
    jurisdictions lends support for the district court’s finding of
    probable    cause.      For    instance,       in   United    States    v.    Martel-
    Martines, the Eighth Circuit found that officers had probable
    cause to search a suspect’s vehicle by punching a hole in the
    suspect’s     truck    bed     based      on   the     suspect’s       evasive     and
    inconsistent responses to questions, the fact that the suspect’s
    vehicle’s underside had been modified, and the existence of an
    inaccessible hidden compartment in the suspect’s truck.                           
    988 F.2d 855
    , 858-59 (8th Cir. 1993).              Likewise, in United States v.
    Arango, the Tenth Circuit held that the existence of a secreted
    compartment in the defendant’s truck, coupled with the fact that
    the defendant did not have adequate luggage for his reported
    two-week vacation, supplied probable cause.                    
    912 F.2d 441
    , 447
    (10th Cir. 1990).       In United States v. Price, where burn marks
    on the bed of a truck drew the attention of officers, who then
    discovered    a    secret     compartment       within   the    bed,     the     Fifth
    Circuit determined the officers had probable cause to search the
    compartment       itself.      
    869 F.2d 801
    ,    804    (5th     Cir.    1989).
    Although    customization      of    an    automobile,       standing    alone,    is
    likely insufficient to support probable cause, see United States
    v. Orrengo-Fernandez, 
    78 F.3d 1497
    , 1504-05 (10th Cir. 1996),
    Martel-Martines, Arango, and Price indicate that the existence
    26
    of a hidden compartment is much more substantial, especially
    when coupled with other factors, see Martel-Martines, 
    988 F.2d at 858-59
    ; Arango, 
    912 F.2d at 447
    ; Price, 
    869 F.2d at 804
    .
    Additionally, circumstances indicating that an auto part is
    meant    to   conceal    contraband       can    provide     added     support    to   an
    officer’s belief in the existence of probable cause.                        In United
    States v. Strickland, an officer noticed an uncharacteristically
    large, incongruently worn tire in the defendant’s trunk. 
    902 F.2d 937
    , 939, 943 (11th Cir. 1990).                    The tire was made by a
    different manufacturer than the other tires on the vehicle, had
    a bent rim, and was extremely heavy.                      
    Id. at 943
    .          When the
    officer moved the tire, he noticed a flopping sound within.                            
    Id.
    These factors, coupled with the officer’s specialized knowledge
    based on training and experience in drug concealment methods,
    convinced the Eleventh Circuit that the officer had probable
    cause to cut the tire open and search inside.                          Id.; see also
    United    States    v.   Davis,    
    458 F.2d 819
    ,    822   (D.C.    Cir.     1972)
    (“[C]onduct       innocent    in   the    eyes    of   the   untrained     may     carry
    entirely different         ‘messages’      to    the   experienced        or     trained
    observer.” (internal quotation omitted)).
    In    this    case,     Trooper     Herndon    noticed      the    axles    on    the
    small,    lightweight,       two-wheel      trailer       were   extremely       large,
    especially considering the fact that the trailer bed was not
    reinforced to carry great weights.                Upon examining the axles, he
    27
    and Trooper Hicks reached the conclusion--based on the numerous
    greasy smudges and handprints, the shiny, worn-down bolts, and
    other signs of removal--that the axles had been taken off and
    put on numerous times, even though such axles usually require
    little    maintenance.             Because    of    his    eleven    years       of       Highway
    Patrol    and    drug       interdiction      experience,        Trooper        Herndon       was
    aware that vehicle axles are a common place for smugglers to
    hide drugs due to the fact that they are just hollow tubes, and
    the    unusual        size    of    these     axles       indicated      they        contained
    contraband.          Moreover, both Flores and Mendez exhibited signs of
    extreme       nervousness       beyond       that     normally      shown       by     traffic
    offenders in routine stops.                  The nervousness was not alleviated
    when    the     Trooper      notified        Flores    he    would       only     receive      a
    warning.       Flores and Mendez offered differing accounts of where
    they were going and what they were doing.                        In fact, Flores could
    not    identify        Mendez’s      name,     despite      claiming        she       was     his
    longtime girlfriend, and neither Mendez nor Flores could provide
    the    name     of    the    cousin     or    uncle       they    were    out        to     help.
    According to Trooper Herndon, the trailer affixed to Flores’s
    Bronco was clearly insufficient to move all the property Flores
    alleged they would transport, and, despite Flores and Mendez’s
    story that they were traveling across the country, the troopers
    found no luggage consistent with such a voyage.                             Based on the
    totality of the circumstances, the district court was correct in
    28
    concluding       that     Trooper      Herndon       had   a   fair     probability    of
    discovering contraband in Flores’s trailer axles, and the search
    was permissible under the Fourth Amendment.
    Finally, Flores’s argument that the search was not within
    the scope of the Fourth Amendment’s automobile exception due to
    the fact that the vehicle was not “readily mobile” after Flores
    exited is without merit.               Numerous cases clarify that the ready
    mobility requirement is meant to distinguish a movable vehicle--
    which     can    easily        be   relocated        to    prevent      a   search    for
    contraband--from          something     that     would      more   appropriately       be
    described       as   a    stationary     home.         See,    e.g.,     California    v.
    Carney, 
    471 U.S. 386
    , 392-93 (1985); United States v. Brookins,
    
    345 F.3d 231
    , 237 n.7 (4th Cir. 2003).                         In other words, the
    ready mobility element centers on “the nature of the use of the
    vehicle” and is more appropriate for consideration where the
    thing    searched        was   being    used    as    a    house   or    exhibited    the
    characteristics of a fixed dwelling rather than a functioning
    vehicle.        Brookins, 
    345 F.3d at
    237 n.7; see also Carney, 
    471 U.S. at 392-93
    .           Since Trooper Herndon observed Flores’s Bronco
    traveling on a public highway immediately prior to the search,
    this case satisfies the ready mobility requirement, and Flores’s
    objection is unavailing.            See Carney, 
    471 U.S. at 392-93
    .
    29
    III. Conclusion
    For the above-stated reasons, we affirm the judgment of the
    district court.
    AFFIRMED
    30