United States v. Tasha Michelle Blackburn , 398 F. App'x 453 ( 2010 )


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  •                                                           [DO NOT PUBLISH]
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE ELEVENTH CIRCUIT
    ________________________          FILED
    U.S. COURT OF APPEALS
    No. 09-14422         ELEVENTH CIRCUIT
    SEPTEMBER 30, 2010
    Non-Argument Calendar
    JOHN LEY
    ________________________
    CLERK
    D. C. Docket No. 08-00256-CR-1-WS
    UNITED STATES OF AMERICA,
    Plaintiff-Appellee,
    versus
    TASHA MICHELLE BLACKBURN,
    BARRY JAY SULLIVAN,
    Defendants-Appellants.
    ________________________
    Appeals from the United States District Court
    for the Southern District of Alabama
    _________________________
    (September 30, 2010)
    Before CARNES, MARCUS and FAY, Circuit Judges.
    PER CURIAM:
    Tasha Michelle Blackburn and Barry Jay Sullivan appeal from their
    convictions for conspiracy to possess with intent to distribute more than 50 grams
    of methamphetamine, in violation of 
    21 U.S.C. §§ 841
    (a)(1) and 846 (“Count 1”).
    In addition, Sullivan appeals from his convictions for possession with intent to
    distribute approximately 31 grams of methamphetamine, in violation of 
    21 U.S.C. § 841
    (a)(1) and 
    18 U.S.C. § 2
     (“Count 3”), and possession with intent to distribute
    approximately 23 grams of cocaine, in violation of 
    21 U.S.C. § 841
    (a)(1) and 
    18 U.S.C. § 2
     (“Count 4”).
    On appeal, Blackburn argues that the district court erred by denying her
    motion to suppress evidence seized from her bedroom. She contends that,
    although her consent to police officers’ request to search her home was voluntary,
    her consent was tainted by a preceding illegal traffic stop, and the evidence seized
    pursuant to her consent should have been suppressed as the fruit of the illegal
    traffic stop.
    Sullivan argues that the evidence was insufficient to support all of his
    convictions. In support of this argument, Sullivan asserts that the government’s
    cooperating witnesses were motivated to provide testimony against him in order to
    receive more lenient sentences in their criminal cases. He further argues that
    several of the government’s cooperating witnesses—including Ham Xaysana and
    2
    Benjamin Adams—may have fabricated their testimony against him and
    Blackburn.
    Finally, Sullivan and Blackburn contend that the court erred by permitting a
    police officer, Jeffrey Stone, to provide his opinions regarding the significance of
    certain items—a gas torch, digital scales, crystal methamphetamine, and a piece of
    paper with the figure “1700” written on it—that were seized from the bedroom
    shared by Blackburn and Sullivan. They argue that the court should not have
    admitted these opinions as expert testimony under Fed.R.Evid. 702 because
    Stone’s opinions invaded the fact-finding province of the jury, and included
    improper speculation. Sullivan and Blackburn further assert that the government
    did not adequately establish how Stone’s experience as a narcotics officer could be
    applied reliably to the facts of the present case. They also argue, in the alternative,
    that the government impermissibly sought to avoid meeting the requirements for
    expert testimony, set forth in Fed.R.Evid. 702, by introducing Sullivan’s opinions
    as those of a lay witness. The government responds that any error that the district
    court may have made in admitting Stone’s opinion testimony was harmless, in light
    of the substantial evidence of Blackburn’s and Sullivan’s guilt.
    For the reasons set forth below, we affirm.
    3
    I.
    A federal grand jury indicted Blackburn and Sullivan, charging them with
    the offenses described above. In addition, the jury charged Blackburn with
    possession of pseudoephedrine with knowledge that it would be used to
    manufacture a controlled substance, in violation of 
    21 U.S.C. § 841
    (c)(2) (“Count
    2”).1
    Blackburn filed a motion to suppress, asserting that the court should
    suppress pseudoephedrine pills seized from her car as the fruit of an unlawful
    traffic stop and subsequent search of her car. Blackburn also sought to suppress
    physical evidence seized from her home, contending that this evidence also
    constituted the fruit of the illegal traffic stop.
    The court held a suppression hearing, during which Samuel Entrekin, a
    police officer employed by the Mobile, Alabama, Police Department (“MPD”),
    testified that, around midnight on May 22, 2009, he was wearing a police uniform
    and was driving a marked police car on Calvert Road. As Entrekin approached the
    intersection of Calvert Road and Airport Boulevard, he observed that a white
    Blazer was preparing to turn left onto Calvert Road from Airport Boulevard.
    1
    Immediately before trial, the court granted the government’s motion to dismiss Count 2
    against Blackburn as a result of the court’s earlier order suppressing the pseudoephedrine pills
    discovered in her car.
    4
    Entrekin next observed that the Blazer stopped and made a “U-turn” on Airport
    Boulevard instead of turning left onto Calvert Road. Entrekin concluded that this
    U-turn was suspicious, because he believed that it constituted evasive action by the
    driver to avoid his police car. Accordingly, Entrekin stopped the Blazer.
    Entrekin further testified that, after he stopped the Blazer, the driver of the
    car, Blackburn, informed him that she did not have a driver’s license on her person,
    but that she had been issued a license by the state of Mississippi. Entrekin
    explained that, when an individual could not provide him with proper
    identification, he would detain the individual in the backseat of his police car until
    he was able to identify the person. Based on the information that Blackburn
    provided to him, Entrekin determined that Blackburn had been issued a driver’s
    license by Mississippi, but that the license was suspended. Entrekin further
    explained that, pursuant to MPD policy, when an officer discovered that an
    individual was not legally permitted to drive her car, the officer should first
    inventory the contents of the car, and then have the car towed. Accordingly,
    Entrekin called for a second police officer, Joey Zeibach, to conduct an inventory
    search of Blackburn’s car while Entrekin issued a citation to Blackburn for driving
    with a suspended license. During the inventory search, Zeibach discovered a roll
    of approximately 100 pseudoephedrine pills in the Blazer. Entrekin responded by
    5
    calling Stone, a narcotics investigator.
    Stone testified that, after he arrived at the scene of the traffic stop, he told
    Blackburn that the officers had found pseudoephedrine pills in her car, and that he
    suspected that these pills were intended to be used in the manufacture of
    methamphetamine. Blackburn responded that she had no connection to the drug
    trade, and Stone stated that, he believed her, but that, in order to verify this belief,
    he “needed to go to her house to look for signs of drug activity.” Blackburn agreed
    that the officers could come to her house. Stone stated to Blackburn that, at that
    point, “she was only being detained for investigation.” Stone also told her that she
    would need to sign a form in order “to protect her rights and [Stone’s] rights too
    when it went to court,” and that he would explain this form to her once they arrived
    at her house. Stone explained that he and Entrekin permitted Blackburn to drive
    her car to her home, because her house was only a short distance away from the
    site of the traffic stop.
    Stone further testified that, after Blackburn and the officers arrived at
    Blackburn’s house and exited their cars, Blackburn began to cry. Stone told
    Blackburn that he “wanted her to cooperate,” but that the officers would leave if
    she asked them to do so. Stone also told Blackburn, however, that if the officers
    left, she would still be detained, and they would apply for a search warrant for her
    6
    house. Blackburn responded by calming down, and agreeing that the officers could
    enter her house to review the consent form. Blackburn then used her key to open
    the door to her house and allow the officers inside. Stone and Blackburn then sat
    on a couch, where Stone reviewed the consent form with Blackburn while the other
    officers executed a protective sweep.2 Stone read the form aloud to Blackburn, and
    underlined the following statements on the form: “I do not have to consent to the
    search”; “I have the right to deny consent, knowing and understanding that I do not
    have to”; and “I [consent] voluntarily.” Blackburn appeared to understand the
    form, and she signed the form. The parties do not dispute that approximately one-
    and-a-half hours elapsed between the time of the traffic stop and the time that
    Blackburn signed the consent form, and that Blackburn signed the form at 1:11
    a.m. on May 23, 2007.
    Stone also testified that, after Blackburn signed the consent form, the
    officers who had conducted the protective sweep told Stone that they had observed
    marijuana on a living room table, and that one of the rooms in the house was
    locked. Blackburn informed the officers that the marijuana did not belong to her,
    and that she did not wish to go to jail due to the marijuana. Stone told Blackburn
    2
    Entrekin testified that he, Zeibach, and another officer conducted the protective sweep
    while Stone reviewed the consent form with Blackburn. Thereafter, Entrekin, Stone, and
    Zeibach remained inside the house, while the fourth officer waited outside of Blackburn’s house.
    7
    that, while he was not concerned about the marijuana, he was concerned about the
    room that was locked from the outside. Blackburn told the officers that she and her
    boyfriend shared the locked room, and she used a key to unlock the door and allow
    the officers inside.
    Stone, Entrekin, and Blackburn entered the bedroom, where the officers
    observed, in plain view, a digital scale and crystal methamphetamine. In addition,
    the officers observed a gas torch, and additional drug paraphernalia. Under the
    mattress, Stone discovered a document listing various numbers and figures. After
    the search of Blackburn’s house had ended, Stone and Entrekin observed Sullivan
    pull into the driveway, and they subsequently found drug paraphernalia in
    Sullivan’s van.
    After the conclusion of Stone’s testimony, the court found that Entrekin’s
    and Stone’s testimony was credible.
    The court entered an order granting Blackburn’s motion in part, and denying
    the motion in part. The court first determined that Entrekin’s traffic stop was not
    supported by reasonable suspicion. The court found that Entrekin subjectively had
    believed that Blackburn’s U-turn was suspicious, and that he reasonably had drawn
    on his own experience to conclude that the U-turn constituted evasive behavior.
    The court reasoned, however, that evasive behavior, standing by itself, does not
    8
    justify a stop. Accordingly, the court granted Blackburn’s motion to the extent that
    it sought suppression of the pills seized from her car.
    The court next found that the evidence seized from Blackburn’s house did
    not constitute the fruit of the illegal traffic stop, because an intervening
    circumstance—Blackburn’s consent—broke the causal connection between the
    illegal stop and the seizure of evidence from Blackburn’s house. In this regard, the
    court specifically made the following factual findings: (1) Stone explained to
    Blackburn that she was not under arrest, and could refuse consent to search her
    house; (2) Blackburn orally consented to the search of her house; (3) Blackburn
    signed a consent form; and (4) Blackburn specifically consented to the officers’
    search of her bedroom by opening the door with a key. Accordingly, the court
    found that Blackburn voluntarily had consented to a search of her house several
    times.
    In analyzing the causal connection between the traffic stop and the search of
    Blackburn’s house, the court determined that Entrekin had not engaged in
    “flagrant” misconduct by stopping Blackburn. The court also found that
    attenuating circumstances occurred when the officers permitted Blackburn to drive
    to her house, and then gave her the opportunity to withdraw her consent. In
    addition, the court found that approximately one-and-a-half hours elapsed between
    9
    the traffic stop and Blackburn’s consent, which was “appreciable time for
    Blackburn to reflect on her decision to give consent.” As a result, the court
    concluded that the items seized from Blackburn’s bedroom were not the fruits of
    the illegal traffic stop, and denied Blackburn’s motion to the extent it sought the
    suppression of these items.
    Blackburn and Sullivan proceeded to a joint trial by jury. During the trial,
    Stone testified that he had worked for the MPD’s narcotics investigation unit for
    three years. Stone identified the items that he and Entrekin found in Blackburn’s
    bedroom, including the gas torch, the digital scale, the crystal methamphetamine,
    and the piece of paper recovered from underneath Blackburn’s mattress, which had
    the figure “1700” written on it. Stone explained that, based on his experience as a
    narcotics officer, he recognized the torch as an item commonly used to
    manufacture methamphetamine. Stone further explained that the presence of
    crystal methamphetamine indicated to him that an individual had a source who
    supplied him with large amounts of methamphetamine. Stone also testified that, in
    his experience, the presence of a digital scale indicated drug trafficking, and not
    mere drug use. In addition, Stone testified that he believed that a price of $1,700
    could correspond to a drug transaction for cocaine or methamphetamine.
    The court overruled Blackburn’s and Sullivan’s motions to strike Stone’s
    10
    opinions regarding the torch, the crystal methamphetamine, the digital scales, and
    the significance of the “1700” figure, as improper opinion testimony. Thereafter,
    Stone testified that his experience as a narcotics officer included interviewing
    individuals involved with manufacturing and distributing methamphetamine. In
    addition, he had participated in investigations, in an undercover capacity, as a
    buyer of methamphetamine, and had received training in the processes by which
    methamphetamine is manufactured. Although Stone provided this testimony
    regarding his specialized experience as a narcotics officer, the government did not
    expressly request that the court admit Stone’s testimony as expert testimony.
    Stone further testified that, during his encounter with Blackburn, Blackburn
    had informed him and other officers that she shared her bedroom with her
    boyfriend. Stone testified that, after the officers arrested Blackburn, Sullivan, who
    was driving a van, pulled into Blackburn’s driveway. During a subsequent search
    of Sullivan’s van, Stone discovered drug paraphernalia, digital scales, cocaine,
    methamphetamine, and crystal methamphetamine. Stone also found plastic tubing
    in the van, and testified that, in his experience as a narcotics officer, he had learned
    that plastic tubing was used to manufacture methamphetamine. Stone also
    discovered numerous small, plastic bags in Sullivan’s van, some of which were
    empty, and some of which contained narcotics. In his experience, Stone had
    11
    learned that such bags were used to package narcotics for sale.
    After the completion of Stone’s testimony, several witnesses, including
    Stacey Dewayne Merritt, Xaysana, Adams, Nelson Oxner, and Christopher
    Michael Long, testified that they had conducted methamphetamine transactions
    with both Blackburn and Sullivan. Merritt, Xaysana, Adams, and Long all testified
    that they had met with Blackburn and Sullivan at a trailer on Ramsey Road to
    conduct methamphetamine transactions. Adams had also met with Blackburn and
    Sullivan at a Motel 6 location at “Tillman’s Corner.”
    Merritt also testified that, over the course of his dealings with Blackburn and
    Sullivan, they had exchanged drug quantities that, together, had a value of
    approximately $40,000. He conceded that, during an interview with a police
    officer, he had not been able to identify Sullivan in a photographic line-up.
    Xaysana testified that he had been introduced to Blackburn and Sullivan by
    a mutual friend, Oxner. Initially, Oxner had purchased drugs from Xaysana, and
    then provided the drugs to Blackburn and Sullivan. Eventually, however, Xaysana
    began to sell methamphetamine directly to Blackburn and Sullivan. Xaysana’s
    drug-trafficking records reflected that, during an approximate two-month period,
    he sold amounts of methamphetamine to Blackburn and Sullivan that ranged
    between one-half of an ounce to three ounces, and at prices that ranged between
    12
    $2,200 and $6,000. On cross-examination, Xaysana admitted that, during the
    previous 13 months, he had been incarcerated at the same prison as other
    government witnesses in the present case.
    Adams testified that he met Blackburn and Sullivan in 2006, and that the
    three agreed that Blackburn and Sullivan would sell methamphetamine for Adams.
    Thereafter, Adams began visiting Blackburn and Sullivan’s trailer, and typically
    would bring an ounce of methamphetamine with him. After Adams arrived, either
    Blackburn or Sullivan would leave to sell the methamphetamine, and the other
    would remain at the trailer with Adams. While he was in prison, Adams spoke
    with Xaysana and another prisoner, Danny Lee, and the three discussed the
    individuals with whom they had bought and sold drugs. Accordingly, the three
    realized that they had all conducted drug transactions with Blackburn and Sullivan.
    When Adams learned that police officers had contacted Xaysana and Lee to ask
    them about Blackburn and Sullivan, Adams wrote a letter to a police officer,
    Joseph Wolfe, to inform Wolfe that he also could provide information about
    Blackburn and Sullivan.
    Oxner testified that, on numerous occasions, he had obtained
    methamphetamine from Xaysana, and, in turn, had sold the methamphetamine to
    Blackburn and Sullivan. Eventually, Xaysana asked Oxner to introduce him to
    13
    Blackburn and Sullivan because they were “moving a lot of methamphetamine.”
    Xaysana subsequently met with Blackburn and Sullivan to discuss prospective
    methamphetamine transactions, and, thereafter, Xaysana sold methamphetamine
    directly to Blackburn and Sullivan. Oxner also had purchased drugs from
    Blackburn on several occasions. While Oxner primarily dealt with Blackburn on
    these occasions, Sullivan would be present. Oxner also stated, “[Blackburn] would
    always talk to [Sullivan], you know. [Blackburn] was doing something and like,
    say, going to sell something to somebody, [and] she would always make sure it
    was all right with [Sullivan].”
    Long testified that, during 2007, he had purchased methamphetamine from
    Blackburn and Sullivan approximately once every one or two weeks. On cross-
    examination, Long testified that he had been unable to identify Sullivan from a
    photographic line-up, despite the fact that he had used drugs or conducted drug
    transactions with Blackburn and Sullivan on approximately 30 to 40 occasions.
    Merritt, Xaysana, Adams, Oxner, and Long each had pled guilty to federal
    drug charges, and, each witness, as part of his plea agreement, had agreed to
    provide substantial assistance to the government in exchange for the government’s
    recommendation that he receive a sentence reduction. These plea agreements were
    admitted into evidence. Each of these witnesses admitted that he hoped to provide
    14
    such substantial assistance by testifying in the present case.
    Wolfe testified that he was employed by the MPD as a Drug Enforcement
    Administration task force officer, and had participated in the investigation of
    Blackburn and Sullivan. Wolfe had shown photographic line-ups of individuals to
    Xaysana, and Xaysana had identified both Blackburn and Sullivan out of the line-
    ups. Adams and Oxner also were able to identify both Blackburn and Sullivan
    from photographic line-ups. When Wolfe interviewed Adams in February 2008,
    Adams provided Wolfe with a list of names of individuals involved in drug
    trafficking. This list included an individual named “Tasha Newton.”
    As a result of his interview with Adams, Wolfe reviewed records from the
    Motel 6 location at Tillman’s corner, and discovered that Blackburn and Sullivan
    had rented a room at that location. Wolfe reviewed telephone records associated
    with the telephone numbers used by Blackburn, Merritt, Xaysana, and Oxner. In
    reviewing these records, Wolfe confirmed the following: (1) between May 21,
    2007, and July 31, 2007, Blackburn called Merritt 512 times, and Merritt called
    Blackburn 52 times; between July 25, 2007, and September 20, 2007, Blackburn
    called Xaysana 4 times, and Xaysana called Blackburn 3 times; and (3) between
    August 1, 2007, and September 25, 2007, Blackburn called Oxner 66 times, and
    Oxner called Blackburn 42 times. The majority of all of these telephone calls
    15
    lasted for approximately one or two minutes.
    On cross-examination, Wolfe admitted that Lee had not been able to identify
    Sullivan out of a photographic line-up. He confirmed that Sullivan’s name was not
    included on the list of individuals that Adams had provided to him in February
    2008. One month after the grand jury issued its July 2008 indictment against
    Blackburn and Sullivan, however, Adams had written a letter to Wolfe, stating that
    he had information about both Sullivan and Blackburn.
    Sullivan moved for a judgment of acquittal as to Count 1, asserting that the
    government had failed to prove the existence of an agreement between himself and
    Blackburn. Sullivan also moved for judgment of acquittal as to Counts 3 and 4,
    asserting that the government had failed to demonstrate that he intended to
    distribute narcotics. The court denied these motions.
    The jury found both Blackburn and Sullivan guilty as to Count 1, and found
    Sullivan guilty as to Counts 3 and 4. The court sentenced Blackburn and Sullivan
    each to terms of 300 months’ imprisonment.
    II.
    “A district court’s ruling on a motion to suppress presents a mixed question
    of law and fact.” United States v. Santa, 
    236 F.3d 662
    , 668 (11th Cir. 2000)
    (quotation omitted). In this context, we review the district court’s factual findings
    16
    for clear error, and construe the facts “in the light most favorable to the party that
    prevailed in the district court.” 
    Id.
     (quotation omitted). We review de novo the
    district court’s application of the law to the facts. 
    Id.
    Where an individual’s consent to a search follows illegal activity by the
    police, we conduct a two-step inquiry to determine whether the exclusionary rule
    should apply to bar the admission of evidence found pursuant to the individual’s
    consent. United States v. Delancy, 
    502 F.3d 1297
    , 1308 (11th Cir. 2007). “First, a
    court must determine whether the consent was voluntary.” 
    Id.
     “Second, the court
    must determine whether the consent, even if voluntary, requires exclusion of the
    evidence found during the search because it was the fruit of the poisonous tree.”
    
    Id.
     (quotation omitted). The second element of this analysis does not focus on “but
    for” causation, but “whether, granting establishment of the primary illegality, the
    evidence to which instant objection is made has been come at by exploitation of
    that illegality or instead by means sufficiently distinguishable to be purged of the
    primary taint.” 
    Id. at 1308-09
     (quoting Wong Sun v. United States, 
    371 U.S. 471
    ,
    488, 
    83 S.Ct. 407
    , 417, 
    9 L.Ed.2d 441
     (1963)).
    In determining whether an individual’s consent was “tainted” by a preceding
    illegal search or seizure, we conduct a “fact-specific” inquiry, considering the
    following non-exhaustive list of factors: (1) temporal proximity; (2) intervening
    17
    circumstances; and (3) the purpose and flagrancy of the government’s conduct.
    Delancy, 
    502 F.3d at 1309-12
    .
    The first factor—temporal proximity—focuses on “the time elapsed between
    the illegal act and a subject’s consent to search.” Delancy, 
    502 F.3d at 1310
    .
    “There is no bright-line rule defining the temporal factor.” 
    Id.
     If the period of
    elapsed time is “extremely short,” then this factor weighs in favor of exclusion. 
    Id.
    In contrast, “a longer interval obviously weighs in favor of admissibility.” 
    Id.
     In
    evaluating temporal proximity, a court should consider the “character” of the
    interaction between the consenting individual and the police officers, considering
    whether the interaction was conversational, or threatening. See 
    id. at 1311
    (holding that, although only 15 minutes elapsed between the allegedly illegal
    police action and the subject’s consent, the interaction between the consenting
    individual and the officers was “conversational” and non-threatening, and thus, on
    the facts of that particular case, “timing [was] not the most important factor”).
    The second factor—intervening circumstances—focuses on whether any
    circumstances or events “interrupt[ed] the causal connection between the illegal act
    and the possibly tainted consent.” Delancy, 
    502 F.3d at 1311
    . An individual’s
    review and signing of a consent form, which clearly states that she had the right to
    refuse consent, may constitute “an important intervening circumstance.” 
    Id.
    18
    In addressing the final factor—the purpose and flagrancy of the officers’
    conduct—we have considered whether: (1) the preceding illegal police activity was
    taken “with the express purpose of exploiting [the] illegal action”; (2) the search
    was limited or broad in its scope; and (3) officers used illegally seized evidence to
    obtain consent. See Delancy, 
    502 F.3d at 1312-13
    ; United States v. Lopez-Garcia,
    
    565 F.3d 1306
    , 1316 (11th Cir.), cert. denied, 
    130 S.Ct. 1012
     (2009).
    Blackburn concedes that her consent was voluntary, and, as a result, we
    focus on the causal connection between Entrekin’s illegal traffic stop and
    Blackburn’s consent for the officers to search her home. As for the first
    factor—temporal proximity—it is undisputed that approximately one-and-a-half
    hours elapsed between Entrekin’s traffic stop and the time that Blackburn signed
    the consent form. Because there is no bright-line rule stating what amount of time
    weighs in favor of admission or exclusion, we examine the character of the
    interaction between Blackburn and the police officers.
    There is no evidence that the police officers threatened Blackburn, pointed
    weapons at her, or handcuffed her. Stone explained to Blackburn that she was not
    under arrest, and informed her that she had the right to refuse consent. Moreover,
    Stone testified that he asked for Blackburn’s consent to search her home once at
    the traffic stop, once outside her home, and a third time when reviewing the
    19
    consent form. In addition, while Blackburn may not have been free to leave when
    she drove her car to her house, the fact that she was able to drive her own car to her
    home demonstrates that she retained appreciable freedom of movement. Based on
    these facts, it appears that the interaction between the police officers and
    Blackburn was non-threatening, and relatively conversational. Moreover, because
    Stone asked for Blackburn’s consent on three separate occasions, Blackburn had
    the opportunity to reflect upon and change her answer before signing the consent
    form. Accordingly, we conclude that temporal proximity is not the most important
    factor in this case. See Delancy, 
    502 F.3d at 1311
    .
    Next, at least one significant attenuating event occurred between the traffic
    stop and Blackburn’s signing of the consent form—Stone’s review of the consent
    form with Blackburn, during which he underlined portions of the form that stated
    that Blackburn had the right to refuse consent. See Delancy, 
    502 F.3d at 1311-12
    .
    This showed that, at the time that Blackburn signed the consent form and allowed
    the officers into her bedroom, she was aware of her rights under the Fourth
    Amendment.
    Finally, although Entrekin’s traffic stop may not have been supported by
    reasonable suspicion, there is no evidence that the officers acted flagrantly. See
    Delancy, 
    502 F.3d at 1309
    . There is no evidence that Entrekin stopped Blackburn
    20
    with the ulterior motive of coercing her into giving consent to search her home, or
    conducting a general, exploratory search. There is no evidence that the searches of
    Blackburn’s car or home were overly broad. See 
    id. at 1312-13
    . As discussed
    above, the evidence also shows that the officers did not threaten Blackburn. In
    addition, although the discovery of the pseudoephedrine pills prompted Stone to
    ask Blackburn for permission to search her house, it does not appear that he
    exploited this evidence to obtain Blackburn’s consent, as he repeatedly informed
    Blackburn that she could refuse consent.
    Accordingly, the three factors discussed above weigh in favor of admission
    of the evidence found in Blackburn’s bedroom. See Delancy, 
    502 F.3d at 1309-12, 1314
    . Although the officers would not have searched Blackburn’s home but for
    Entrekin’s illegal traffic stop, the relevant analysis does not focus on “but for”
    causation. See 
    id.,
     
    502 F.3d at 1309
    . Rather, because Blackburn had several
    opportunities to refuse consent, had been informed of her Fourth Amendment
    rights before the officers searched her bedroom, and was not subjected to flagrant
    police conduct, her consent was not tainted by the illegal traffic stop, and the
    district court did not err in denying her motion to suppress the evidence found in
    her bedroom. See 
    id. at 1309-12, 1314
    .
    21
    III.
    “We review challenges to the sufficiency of the evidence de novo.” United
    States v. Mercer, 
    541 F.3d 1070
    , 1074 (11th Cir. 2008). “We view the evidence in
    the light most favorable to the government and all reasonable inferences . . . in the
    government’s favor.” 
    Id.
     In addition, “[b]ecause credibility determinations are the
    exclusive province of the fact finder, we cannot disregard the jury’s credibility
    determination unless it is unbelievable on its face.” United States v. Garcia, 
    405 F.3d 1260
    , 1270 (11th Cir. 2005) (quotation omitted). We must decide whether a
    reasonable fact finder “could have found the defendant guilty beyond a reasonable
    doubt.” Mercer, 
    541 F.3d at 1074
    .
    Pursuant to 
    21 U.S.C. §§ 841
    (a)(1) and 846, it is illegal for an individual to
    conspire to possess with intent to distribute methamphetamine. See 
    21 U.S.C. §§ 841
    (a)(1) and 846. “To support a conspiracy conviction, the government must
    prove (1) an agreement between the defendant and one or more persons, (2) the
    object of which is to do . . . an unlawful act.” United States v. Smith, 
    289 F.3d 696
    ,
    706 (11th Cir. 2002) (quotation omitted). “To prove participation in a conspiracy,
    the government must [prove] . . . that a conspiracy existed and that the defendant
    knowingly and voluntarily joined the conspiracy.” Garcia, 405 F.3d at 1269.
    “[T]he government need not prove that the defendants knew all of the detail[s] or
    22
    participated in every aspect of the conspiracy.” Id. at 1270. “Rather, the
    government must only prove that the defendant[] knew the essential nature of the
    conspiracy.” Id. (quotation omitted). Although the defendant’s presence at the
    scene of a crime, standing alone, is insufficient to support a conspiracy conviction,
    his presence is probative of whether he participated in the charged conspiracy.
    United States v. McDowell, 
    250 F.3d 1354
    , 1365 (11th Cir. 2001).
    “To convict a defendant of possession with intent to distribute controlled
    substances, the [g]overnment must prove that he or she possessed drugs with the
    intent to distribute them.” United States v. Miranda, 
    425 F.3d 953
    , 959 (11th Cir.
    2005). “The government may prove each of these elements with direct or
    circumstantial evidence.” 
    Id.
     (quotation omitted). The evidence may be sufficient
    to support a defendant’s convictions for possession with intent to distribute
    narcotics where the evidence shows that the defendant joined in a drug-trafficking
    conspiracy, and was in the presence of large quantities of narcotics. See Miranda,
    
    425 F.3d at 955, 961-62
    .
    Here, the jury heard testimony regarding the witnesses’ plea agreements
    with the government, and the relevant plea agreements were entered into evidence.
    Moreover, the jury heard evidence regarding the timing and circumstances under
    which Xaysana and Adams provided information regarding Blackburn and
    23
    Sullivan to police officers. In addition, the jury heard evidence that Merritt and
    Long could not identify Sullivan out of a photographic line-up. Accordingly, the
    jury was armed with all of the evidence emphasized by Sullivan on appeal when it
    made credibility determinations, and the jury’s decision to credit the testimony of
    the cooperating government witnesses is not “unbelievable on its face.” See
    Garcia, 405 F.3d at 1270. Significantly, several witnesses testified that they had
    met with Blackburn and Sullivan on Ramsey Road. Xaysana and Oxner testified
    consistently with each other that Oxner had introduced Xaysana to Blackburn and
    Sullivan, and that Xaysana subsequently began to directly deal with Blackburn and
    Sullivan. In addition, many of the witnesses’ testimony, that they had met with
    Blackburn and Sullivan to deal drugs, was corroborated by hotel records and
    telephone records. Several witnesses were able to identify both Blackburn and
    Sullivan from photographic line-ups.
    Based on the testimony described above, there was sufficient evidence for a
    reasonable jury to conclude that a conspiracy to buy and sell methamphetamine
    existed, and that Sullivan had joined in that conspiracy. See 
    21 U.S.C. §§ 841
    (a)(1) and 846; Garcia, 405 F.3d at 1269-70. The witnesses testified that
    Sullivan was present during numerous methamphetamine transactions. See
    McDowell, 
    250 F.3d at 1365
    . Importantly, Xaysana testified that he had conducted
    24
    methamphetamine transactions with Sullivan, and Adams testified that Blackburn
    and Sullivan worked together to sell methamphetamine. Oxner testified that
    Blackburn would ask for Sullivan’s approval before she conducted drug
    transactions. Based on this testimony, the jury could reasonably conclude that
    Sullivan knew of the essential nature of the conspiracy, and had participated in the
    conspiracy. See Garcia, 405 F.3d at 1269-70. Accordingly, sufficient evidence
    supports Sullivan’s conviction as to Count 1.
    Sufficient evidence also supports Sullivan’s convictions as to Counts 3 and
    4. As noted above, the evidence showed that Sullivan joined in a conspiracy to
    buy and sell methamphetamine. See Miranda, 
    425 F.3d at 961-62
    . The witnesses’
    testimony showed that Sullivan frequently was in the presence of large amounts of
    methamphetamine, as they testified that a single transaction with Blackburn and
    Sullivan could involve thousands of dollars, or an ounce or more of
    methamphetamine. See 
    id.
     Moreover, Stone testified that he found both cocaine
    and methamphetamine in Sullivan’s van, in close proximity to items typically
    associated with distributing drugs and manufacturing methamphetamine, including
    digital scales, baggies, and plastic tubing. Sullivan does not contest that the
    amounts of cocaine and methamphetamine discovered in his van were equal to 31
    grams of methamphetamine and 23 grams of cocaine, or approximately one ounce
    25
    of each substance.3 All of this evidence was sufficient to support Sullivan’s
    convictions as to Counts 3 and 4. See Miranda, 
    425 F.3d at 959, 961-62
    .
    IV.
    “We review the district court’s decisions regarding the admissibility of
    expert testimony for abuse of discretion.” United States v. Emmanuel, 
    565 F.3d 1324
    , 1335 (11th Cir.), cert. denied, 
    130 S.Ct. 1032
     (2009). Where a defendant
    fails to raise an evidentiary objection before the district court, however, and seeks
    to raise the argument for the first time on appeal, we apply plain-error review. See
    
    id. at 1333
    . “To demonstrate plain error, there must be an (1) error (2) that is plain
    and (3) that affects substantial rights.” 
    Id.
     (quotation omitted).
    Pursuant to Fed.R.Evid. 701, “If the witness is not testifying as an expert,
    the witness’ testimony in the form of opinions or inferences is limited to those
    opinions or inferences which are . . . not based on scientific, technical, or other
    specialized knowledge within the scope of Rule 702.” Fed.R.Evid. 701(c).
    Pursuant to Fed.R.Evid. 702:
    If scientific, technical, or other specialized knowledge will assist the
    trier of fact to understand the evidence or to determine a fact in issue,
    a witness qualified as an expert by knowledge, skill, experience,
    training, or education, may testify thereto in the form of an opinion or
    otherwise, if (1) the testimony is based upon sufficient facts or data,
    (2) the testimony is the product of reliable principles and methods,
    3
    One ounce is equal to approximately 28.35 grams.
    26
    and (3) the witness has applied the principles and methods reliably to
    the facts of the case.
    Fed.R.Evid. 702.
    “The rule is well-established that an experienced narcotics agent may testify
    about the significance of certain conduct or methods of operation unique to the
    drug distribution business.” United States v. Butler, 
    102 F.3d 1191
    , 1199 (11th
    Cir. 1997). Under Rule 702, experienced government agents may provide
    testimony regarding general techniques used by drug traffickers, or the meaning of
    certain jargon used in the drug-trafficking business. See United States v. Chastain,
    
    198 F.3d 1338
    , 1348-49 (11th Cir. 1999) (court did not abuse its discretion by
    permitting a U.S. customs agent, who had ten years’ experience in investigating
    drug smuggling and had received training in the area of drug smuggling with the
    use of airplanes, to provide expert testimony about general techniques used by drug
    traffickers who use airplanes to smuggle drugs). Nevertheless, such opinion
    testimony is improper where a case agent goes beyond providing information about
    methods unique to the drug business and “summarizes his beliefs about the
    defendant’s conduct based upon his knowledge of the case.” Emmanuel, 
    565 F.3d at 1335
     (quotation omitted). Even if a district court errs by admitting opinion
    testimony, however, such a non-constitutional error will not warrant reversal of the
    defendant’s conviction “where [the] error had no substantial influence on the
    27
    outcome, and sufficient evidence uninfected by error supports the verdict.” 
    Id.
    (quotation omitted).
    “[I]t is error to admit [the] opinion testimony of lay witnesses based on
    specialized knowledge,” and a party may not evade the requirements for expert
    testimony, set forth in Rule 702, by proffering an expert witness as if he were a lay
    witness. United States v. Dulcio, 
    441 F.3d 1269
    , 1275 (11th Cir. 2006). Such an
    error, however, is also subject to the harmless-error test described above. See 
    id.
    Here, Stone’s opinions as to the significance of the torch, digital scales,
    crystal methamphetamine, and “1700” figure were based on his specialized
    experience as a narcotics officer, and, as a result, his testimony in this regard
    constituted expert testimony. See Fed.R.Evid 702; Butler, 
    102 F.3d at 1199
    . To
    the extent that Blackburn and Sullivan argue that Stone was not qualified to give an
    expert opinion regarding the significance of certain items in the methamphetamine
    trade, we review this argument only for plain error, because they did not raise this
    objection to the district court. Emmanuel, 
    565 F.3d at 1333
    . In this regard, there
    was no error, let alone plain error, as Stone testified that he had received training in
    the methods by which methamphetamine is manufactured, and had investigated
    narcotics crimes for three years. See Chastain, 
    198 F.3d at 1348-49
    .
    Moreover, most of Stone’s opinion testimony did not invade the fact-finding
    28
    province of the jury. See Emmanuel, 
    565 F.3d at 1335
    . Stone’s opinions regarding
    the gas torch, the crystal methamphetamine, and the digital scales were limited to
    generalizations based on what he had learned as a narcotics officer, and did not
    include an opinion as to how Blackburn or Sullivan used certain items.
    Accordingly, the court did not abuse its discretion in denying Blackburn’s and
    Sullivan’s motions to strike this testimony on the ground that it invaded the
    province of the jury, or amounted to improper speculation. See Emmanuel, 
    565 F.3d at 1335
    ; Fed.R.Evid. 702. While Stone’s opinion regarding the significance
    of the “1700” figure did not bear as clear of a connection to his experience as a
    narcotics officer, any error that the court made in admitting this testimony was
    harmless in light of the substantial evidence of Blackburn’s and Sullivan’s guilt,
    which is described above. See Emmanuel, 
    565 F.3d at 1335
    .
    Sullivan’s and Blackburn’s alternative argument—that the government
    improperly presented Stone’s opinions as those of a lay witness—also lacks merit.
    Because Sullivan and Blackburn did not raise this objection to the district court, it
    is subject to plain error review. See Emmanuel, 
    565 F.3d at 1333
    . Sullivan and
    Blackburn cannot satisfy the plain-error standard because, even if Stone’s opinions
    were improperly presented as those of a lay witness, the error was harmless in light
    of testimony from numerous witnesses that they had conducted methamphetamine
    29
    transactions with both Blackburn and Sullivan, and the fact that nearly one ounce
    each of methamphetamine and cocaine were discovered in Sullivan’s van. See 
    id. at 1333, 1335
    .
    For the foregoing reasons, we affirm Blackburn’s and Sullivan’s
    convictions.
    AFFIRMED.
    30