United States v. Lonnie Morris ( 2009 )


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  •                              In the
    United States Court of Appeals
    For the Seventh Circuit
    No. 08-2979
    U NITED S TATES OF A MERICA,
    Plaintiff-Appellee,
    v.
    L ONNIE D. M ORRIS,
    Defendant-Appellant.
    Appeal from the United States District Court
    for the Northern District of Illinois, Western Division.
    No. 06 CR 50007—James B. Zagel, Judge.
    A RGUED JUNE 2, 2009—D ECIDED A UGUST 10, 2009
    Before P OSNER, R IPPLE, and K ANNE, Circuit Judges.
    K ANNE, Circuit Judge. In 2007, a jury convicted Lonnie
    Morris of drug and firearm offenses. On appeal, he chal-
    lenges the sufficiency of the evidence, the jury instruc-
    tions, and the admission of certain expert testimony.
    We affirm his conviction.
    I. B ACKGROUND
    In late May 2005, authorities began investigating sus-
    pected drug trafficking activities at 707 Albert Avenue, a
    2                                            No. 08-2979
    residence on the west side of Rockford, Illinois. The
    investigation was conducted by the Metro Narcotics
    Unit, a joint enterprise between the Rockford Police
    Department and the Winnebago County Sheriff’s De-
    partment. Sergeant Marc Welsh supervised the MNU.
    Between five and ten times from May 22 to June 2,
    Richard Gambini, a detective with the MNU, surveilled
    707 Albert. The house was leased by Tamica Wilson, who
    lived there with her two children. On at least five occa-
    sions, Gambini observed the defendant, Lonnie Morris,
    on or near the premises. Morris was frequently seen
    coming and going in a maroon-colored 1995 Chrysler
    Cirrus.
    Early in the morning on June 2, Gambini and a
    colleague searched trash bags that were left on the curb
    in front of 707 Albert. Inside, they found approximately
    three hundred plastic sandwich bags with the bottoms
    cut off; remnants of a package of Dormin, an over-the-
    counter sleeping pill commonly used to “cut,” or dilute,
    heroin for sale; and a handful of documents sent to
    Lonnie Morris’s attention at a different address.
    Later that day, Gambini returned to 707 Albert with a
    search warrant for both the house and the Chrysler
    Cirrus. Gambini drove by the home and elected not to
    execute the warrant at that time because the Cirrus
    was not parked at the house.
    Within minutes, Gambini found the Cirrus in a liquor
    store parking lot a short drive from 707 Albert. Morris
    was in the driver’s seat, alone in the car. As Gambini
    watched, an individual approached Morris’s car window,
    No. 08-2979                                             3
    where the two engaged in a short conversation and ex-
    changed unidentifiable items.
    Following this first exchange, Morris drove the Cirrus
    out of the parking lot. Gambini followed. After driving
    for several blocks, Morris pulled the car to the curb near
    an intersection. The scene from the liquor store repeated
    itself. A different individual approached the car, spoke
    with Morris through the driver’s window, and engaged
    in a hand-to-hand exchange with Morris. Again, Gambini
    was unable to identify the items that the men exchanged.
    From there, Morris, with Gambini still on his tail, pro-
    ceeded to 707 Albert. Morris parked the Cirrus in the
    driveway but remained in the car. A short time later, a
    second car pulled into the driveway behind the Cirrus.
    The driver of the second car emerged and walked to
    the Cirrus, where he had a short discussion with Mor-
    ris. For a third time, Morris handed something to the
    individual through the driver’s window, received some-
    thing in return, and the man departed. Morris then
    entered the house.
    At that point, Gambini summoned his team to execute
    the warrant on 707 Albert. Within ten minutes, the
    MNU raid squad arrived and entered the premises
    through its back door. Gambini, who was the last one
    through the door, heard someone running up a set of
    stairs located to his right that led to the home’s base-
    ment. He moved to the top of the stairs and observed
    Morris scaling the last few steps before running through
    the door and out of the house. An officer stationed
    outside tackled Morris.
    4                                              No. 08-2979
    In the basement of the house, officers found a washer
    and dryer, a cellular telephone, a razor blade, a digital
    scale, and two empty plastic sandwich bags. In addition
    to random debris, the basement contained a mattress
    leaned against a corner wall. Behind the mattress, the
    search team found a one-gallon plastic bag containing a
    chunky, brown, powdery substance that was later identi-
    fied as 23.6 grams of heroin. Officers searched the
    entire residence but found no tangible evidence linking
    Morris to the house.
    Police also discovered pertinent evidence inside the
    Chrysler Cirrus. In the door’s handle well, Detective
    Gambini found a small plastic bag, inside of which were
    two smaller plastic bags. The two smaller plastic bags
    contained an off-white powdery substance, later
    identified as a total of 0.09 grams of a mixture containing
    heroin. Underneath the bag with the heroin, Gambini
    found another plastic bag, in which he recognized four
    pink Dormin tablets. Like many cars, the Cirrus had a
    storage compartment in the lower portion of the
    driver’s door. In that compartment, Gambini observed a
    document and a Jennings .22-caliber handgun. Further
    inspection revealed that Morris’s name was on the docu-
    ment.
    The search proceeded to 707 Albert’s detached garage.
    There, Gambini discovered two vehicles, one being a
    Lincoln Town Car. The Town Car’s trunk was ajar, and
    inside Gambini found three plastic bags filled with a
    total of nearly $5,000 in cash. Subsequent analysis
    revealed Morris’s fingerprints on one of the bags. Using
    No. 08-2979                                             5
    a distinctive red key chain found inside the house,
    Gambini opened the Town Car, where he found a docu-
    ment from the Department of Public Aid addressed to
    Lonnie Morris.
    Following the search, Detective Gambini and a colleague,
    Detective Rossow, escorted Morris to jail. According to
    Gambini’s testimony, Morris told the two detectives
    while in transit: “This case is dropped. You had no proba-
    ble cause to get in my house.”
    Morris was subsequently released. Four days later,
    authorities pulled him over for driving without wearing
    a seat belt. Detective Gambini came to the traffic stop,
    where he observed and seized the same distinctive red
    key chain that he had used to open the Town Car during
    the search of 707 Albert.
    In February 2006, a federal grand jury returned an
    indictment charging Morris with three offenses.
    Count One alleged that Morris knowingly and intention-
    ally possessed, with intent to distribute, 23.7 grams of
    a substance containing heroin, thereby violating 21
    U.S.C. § 841(a)(1). Count Two charged Morris, a con-
    victed felon, with possessing a firearm. See 18 U.S.C.
    §§ 922(g)(1), 924(e)(1). Count Three averred that Morris
    had knowingly possessed a firearm in furtherance of
    the drug trafficking crime alleged in Count One, a viola-
    tion of 18 U.S.C. § 924(c). Morris was arrested shortly
    thereafter.
    A jury trial was held in January 2007. The government
    presented evidence of the preceding facts, as well as
    several expert witnesses, including Sergeant Welsh, who
    6                                                No. 08-2979
    testified to common practices observed in the area
    drug trade. The jury found Morris guilty of all three
    counts contained in the indictment. The court later sen-
    tenced Morris to a total of 300 months in prison. Morris
    now appeals the conviction.
    II. A NALYSIS
    Morris presents three arguments on appeal. First, he
    contends that the evidence was insufficient to support
    his conviction. Specifically, he argues (1) that the gov-
    ernment failed to prove that he constructively possessed
    either the drugs or the gun, and (2) that if he did possess
    the gun, the evidence did not support the jury’s finding
    that such possession was “in furtherance of” a drug
    trafficking crime. Second, and relatedly, Morris asserts
    that the district court erred in refusing to give a proffered
    jury instruction defining the term “in furtherance of.”
    Finally, Morris challenges the district court’s decision
    to admit Sergeant Welsh’s expert testimony con-
    cerning distributable quantities of heroin. Although we
    see some merit in these challenges, none are ultimately
    persuasive.
    A. Sufficiency of the Evidence
    A defendant attacking the sufficiency of the evidence
    used to convict him “ ‘faces a nearly insurmountable
    hurdle.’ ” United States v. Pulido, 
    69 F.3d 192
    , 205 (7th Cir.
    1995) (quoting United States v. Teague, 
    956 F.2d 1427
    , 1433
    (7th Cir. 1992)). To succeed, Morris must show that,
    No. 08-2979                                                  7
    based on the evidence presented at trial, no rational
    juror could find guilt beyond a reasonable doubt. United
    States v. Luster, 
    480 F.3d 551
    , 555 (7th Cir. 2007); United
    States v. Hach, 
    162 F.3d 937
    , 942 (7th Cir. 1998) (“Only if
    the record is devoid of evidence from which a jury
    could find guilt will we reverse.”). In conducting this
    analysis, we view the evidence in the light most favor-
    able to the government. United States v. Richardson, 
    208 F.3d 626
    , 631 (7th Cir. 2000).
    Morris’s initial sufficiency of the evidence arguments
    relate to his possession of the drugs and firearm. His
    remaining challenge is that the evidence was insufficient
    to find that he possessed the firearm “in furtherance of”
    a drug trafficking crime.
    1. Constructive Possession
    All three counts on which the jury convicted Morris—
    possessing heroin with intent to distribute, see 21 U.S.C.
    § 841(a)(1); possessing a firearm in furtherance of a drug
    trafficking crime, see 18 U.S.C. § 924(c)(1)(A); and possess-
    ing a firearm as a convicted felon, see 
    id. § 922(g)(1)—
    involve one common element: possession. Morris now
    challenges this element with respect to each of his
    three convictions.
    For each of these offenses, possession can be either
    actual or constructive. See United States v. Irby, 
    558 F.3d 651
    , 654 (7th Cir. 2009) (applying § 841(a)(1)); United
    States v. Castillo, 
    406 F.3d 806
    , 812 (7th Cir. 2005) (applying
    § 924(c)(1)); United States v. Caldwell, 
    423 F.3d 754
    , 757-58
    8                                                No. 08-2979
    (7th Cir. 2005) (applying § 922(g)(1)). Constructive posses-
    sion is a legal fiction whereby an individual is deemed
    to “possess” contraband items even when he does not
    actually have immediate, physical control of the objects,
    i.e., the individual “does not possess them in a literal
    sense.” United States v. Windom, 
    19 F.3d 1190
    , 1200 (7th Cir.
    1994); see also United States v. Kitchen, 
    57 F.3d 516
    , 524 n.2
    (7th Cir. 1995) (defining “actual possession”). Because the
    government does not contend that Morris actually pos-
    sessed either the drugs or the gun, we confine our dis-
    cussion to constructive possession.
    To determine constructive possession of both the drugs
    and the gun, we apply the same test. See, e.g., United
    States v. Kelly, 
    519 F.3d 355
    , 361 (7th Cir. 2008). Compare
    
    Irby, 558 F.3d at 654
    (requiring proof of “owner-
    ship, dominion, or control” to demonstrate constructive
    possession of drugs), with 
    Caldwell, 423 F.3d at 758
    (requir-
    ing that a person “ha[ve] the power . . . to exercise domin-
    ion and control” over a gun). In either case, the govern-
    ment must prove a nexus between the defendant and
    the relevant item to separate true possessors from mere
    bystanders. 
    Richardson, 208 F.3d at 632
    . Proximity to the
    item, presence on the property where the item is located,
    or association with a person in actual possession of the
    item, without more, is not enough to support a finding
    of constructive possession. 
    Windom, 19 F.3d at 1200
    (citing United States v. DiNovo, 
    523 F.2d 197
    , 201 (7th Cir.
    1975)). Instead, the defendant must exercise dominion
    and control over the item. 
    Irby, 558 F.3d at 654
    ; 
    Kelly, 519 F.3d at 361
    . The government may prove constructive
    possession through direct as well as circumstantial evi-
    dence. 
    Kelly, 519 F.3d at 361
    .
    No. 08-2979                                              9
    We turn first to the question of whether Morris con-
    structively possessed the heroin found in the basement
    at 707 Albert. We then consider whether Morris construc-
    tively possessed the heroin and the pistol found in the
    door of the Chrysler Cirrus.
    a.   Constructive Possession of the Heroin in 707 Albert’s
    Basement
    Upon executing the search warrant at 707 Albert, author-
    ities discovered 23.6 grams of heroin in the basement.
    Morris argues that the evidence was insufficient to
    prove the requisite nexus connecting him to these drugs.
    Such a nexus is typically shown in one of two ways.
    First, if the government demonstrates that the defendant
    had “exclusive control” over the property where the
    drugs were discovered, one may infer that the defen-
    dant constructively possessed the items, including drugs,
    found on that property. 
    Castillo, 406 F.3d at 812
    . In
    this case, however, the government did not rest its argu-
    ments at trial on whether Morris possessed such control.
    Instead, the government focused on the second means
    of proving a nexus between Morris and the drugs in the
    basement: substantial connection.
    In the absence of exclusive control, evidence that a
    defendant had a “substantial connection” to the location
    where contraband was seized is sufficient to establish
    the nexus between that person and the drugs. See Richard-
    
    son, 208 F.3d at 632
    ; see also United States v. Brown, 
    328 F.3d 352
    , 355 (7th Cir. 2003). As we will discuss, we have
    found a substantial connection in a variety of circum-
    10                                            No. 08-2979
    stances, and we conclude that such a connection existed
    here.
    In Richardson, 
    208 F.3d 626
    , for example, we found the
    defendant to be substantially connected to a residence
    when he kept clothes and medicine at the house,
    received mail there, and “admitted that he was the care-
    taker and landlord of the address.” 
    Id. at 632.
    Similarly,
    in Kitchen, 
    57 F.3d 516
    , we held that the jury was right
    to find constructive possession when the defendant
    had received calls at the home where weapons were
    found, had stated that he lived at that address, and had
    been seen at the address on numerous occasions. 
    Id. at 520.
    In addition, investigators located the defendant’s
    clothing, jewelry, and mail at the residence. 
    Id. Finally, the
    defendant had spent substantial amounts of money
    repairing the house. 
    Id. The facts
    of the instant case are not as straightforward
    as those in Richardson and Kitchen. During the search of
    707 Albert, the police did not recover any tangible
    items linking Morris to the premises. They found no
    clothing, no personal items, and no mail sent to Morris
    at that address. Morris claims that the government’s case
    was founded on mere proximity alone and that the
    absence of tangible evidence linking him to 707 Albert
    is determinative. In support, Morris relies principally
    on two cases, Windom, 
    19 F.3d 1190
    , and United States v.
    Herrera, 
    757 F.2d 144
    (7th Cir. 1985).
    In Windom, the government produced no evidence
    linking the defendant to drugs found in a backpack
    that was recovered from a house belonging to the defen-
    No. 08-2979                                               11
    dant’s 
    niece. 19 F.3d at 1201
    . The defendant was in the
    house when the backpack was discovered, but the court
    held that his presence alone was not enough to support
    the jury’s conviction. 
    Id. at 1200-01.
      We reached the same conclusion in Herrera. There, the
    defendant was arrested after he left a house carrying a
    brown bag that contained 
    heroin. 757 F.2d at 147
    . A
    search of the house he was leaving revealed a locked
    footlocker containing numerous packages of heroin, a
    gun, money, a scale, and plastic bags. 
    Id. The district
    court
    convicted the defendant of possessing the heroin found
    in the footlocker. 
    Id. at 148.
    On appeal, we overturned
    the conviction related to these drugs, concluding that
    the government had not shown that the defendant had
    the ability to exercise dominion and control over them.
    
    Id. at 150.
    The footlocker was locked, the defendant had
    no key, and the purity of the heroin seized on the defen-
    dant’s person did not match the purity of the heroin
    found inside the locker. 
    Id. The only
    evidence of the
    defendant’s “possession” of the drugs in the footlocker
    was his presence on the property where it was located,
    and that was insufficient. 
    Id. We agree
    with Morris that his case bears some semblance
    to Windom and Herrera. There is a dearth of tangible
    evidence linking Morris to 707 Albert, and we recognize
    that much of the government’s case at trial rested on
    Morris’s proximity to the drugs in the basement. As
    we mentioned, however, the government may use cir-
    cumstantial evidence to demonstrate the substantial
    connection sufficient to prove constructive possession.
    12                                             No. 08-2979
    
    Kelly, 519 F.3d at 361
    . And, although proximity alone
    is not enough to establish constructive possession, the
    requisite additional evidence, circumstantial though it
    may be, need not take the form of physical, tangible
    items that link an individual to a given location.
    The D.C. Circuit, in words that we find persuasive, has
    said that “proximity coupled with evidence of some
    other factor—including connection with [an impermissible
    item], proof of motive, a gesture implying control, evasive
    conduct, or a statement indicating involvement in an
    enterprise is enough to sustain a guilty verdict.” United
    States v. Richardson, 
    161 F.3d 728
    , 732 (D.C. Cir. 1998)
    (quotations omitted); see also United States v. Gibbs, 
    904 F.2d 52
    , 57 (D.C. Cir. 1990). We find that there was
    ample evidence of these “other factors.”
    We begin with Morris’s flight from the basement. We
    have previously identified a defendant’s flight as the
    “something more” sufficient to overcome the mere pres-
    ence doctrine. See United States v. Starks, 
    309 F.3d 1017
    ,
    1025 (7th Cir. 2002). In Starks, police raided a house
    and discovered the two defendants in a room with a table
    full of drugs. 
    Id. at 1019.
    The men fled, hiding in a
    closet. 
    Id. at 1020.
    The house itself was largely devoid of
    possessions, resulting in no tangible evidence to link the
    defendants to the house. 
    Id. The defense
    argued on
    appeal that mere presence was insufficient to support a
    finding of possession by one of the defendants. 
    Id. at 1022.
    In upholding the conviction, we identified the de-
    fendant’s flight as one factor supporting the jury’s
    verdict. 
    Id. at 1025
    (“From the very infancy of criminal
    No. 08-2979                                                    13
    litigation, juries have been permitted to consider flight
    as evidence of consciousness of guilt and thus of guilt
    itself.” (quotations omitted)). In the present case, the
    inference of guilt drawn from Morris’s flight is only
    strengthened when the area from where he was fleeing
    contained nothing of any substance but the drugs and
    accompanying paraphernalia.1
    Morris’s flight was not the only circumstantial evidence
    of his “substantial connection” to 707 Albert. His own
    words provided more. Morris made two statements
    indicating a connection with the house. First, following
    his arrest, Morris told Detective Gambini: “This case is
    dropped. You had no probable cause to get in my
    house” (emphasis added). Next, according to a written
    statement provided by Donte Webb, one of Morris’s
    cousins, Morris told Webb “that the police had raided one
    of [Morris’s] houses.” Such statements certainly give rise
    to the inference that Morris was substantially connected
    to 707 Albert. See 
    Starks, 309 F.3d at 1024
    (discussing that
    a “link” distinguishing mere presence from participa-
    tion could include “the giving of incriminating state-
    ments”); cf. 
    Richardson, 208 F.3d at 632
    (denying a
    sufficiency-of-the-evidence challenge in part because
    1
    As previously noted, the contents of the basement included a
    mattress leaned against one wall, behind which police located
    the bag of heroin; a washer and dryer; a cellular telephone; a
    razor blade; a digital scale; some small plastic bags; and debris.
    Only the washer and dryer would seem to have any legitimate
    purpose, and we doubt very much that Morris was doing
    laundry.
    14                                               No. 08-2979
    the defendant admitted to being the landlord of the
    property); 
    Richardson, 161 F.3d at 732
    (indicating that a
    statement intimating involvement would be enough to
    support a conviction); 
    Kitchen, 57 F.3d at 520
    (denying a
    sufficiency-of-the-evidence challenge in part because
    the defendant admitted to living at the address).
    Other evidence supporting the jury’s finding of the
    requisite connection between Morris and 707 Albert
    included the frequency of Morris’s presence at the
    house during previous weeks, see 
    Kitchen, 57 F.3d at 520
    (noting that the defendant had been seen at the house
    “on numerous occasions”), and the Lincoln Town Car
    parked in the house’s garage, which contained a docu-
    ment addressed to Morris and whose key Morris
    possessed during the traffic stop four days after the
    search. In addition, police recovered his fingerprint on
    the money bag that was found in the Town Car. Also, in
    a search of 707 Albert’s garbage, police discovered mail
    to Morris, albeit not sent to that address.
    In sum, although the evidence might not have been
    as persuasive as Morris’s name on the lease, his clothes
    in the closet, or his letters in the mailbox, it provided
    sufficient circumstantial support for the jury’s finding
    that Morris had a substantial connection to 707 Albert.
    This connection gave rise to the permissible inference
    that Morris constructively possessed the drugs contained
    in its basement. See 
    Starks, 309 F.3d at 1021-22
    (“[T]he trier
    of fact is entitled to employ common sense in making
    reasonable inferences from circumstantial evidence.”).
    Thus, we reject Morris’s challenge to the sufficiency of the
    No. 08-2979                                                 15
    evidence related to the 23.6 grams of heroin found in 707
    Albert, and we turn to the sufficiency of the evidence
    pertaining to the drugs and firearm found in the
    Chrysler Cirrus parked in the driveway.
    b.   Constructive Possession of the Heroin and Firearm in the
    Cirrus
    The search warrant executed at 707 Albert also autho-
    rized the search of two vehicles, one of which was the
    Chrysler Cirrus that Morris drove to the house the day
    of the raid. From storage areas in the Cirrus’s driver’s-side
    door, police recovered two small bags of “an off-white
    powdery substance,” later identified as 0.09 grams of a
    mixture containing heroin; a handgun; and a document
    with Morris’s name on it. Again, because the govern-
    ment does not claim that Morris was ever seen
    handling either the drugs or the gun, Morris challenges
    the sufficiency of the evidence demonstrating that he
    constructively possessed the items found in the car.
    We find this to be a much simpler question than Morris’s
    initial challenge concerning the drugs in 707 Albert’s
    basement.
    Morris’s arguments again rest on the mere presence
    doctrine. The car was registered in another person’s
    name, and there was evidence that other people drove
    the vehicle during the days and weeks preceding the
    search on June 2. Morris’s fingerprints were found on
    neither the firearm nor the bags containing the drugs.
    That, however, is where the evidence favorable to
    Morris ends.
    16                                             No. 08-2979
    Detective Gambini testified that he had seen Morris
    driving the Cirrus on multiple occasions during his
    surveillance of 707 Albert. On June 2, the day of the raid,
    Gambini observed Morris in the Cirrus near the house.
    As Gambini watched, Morris engaged in three separate
    exchanges with individuals approaching the car, the
    third of which occurred in 707 Albert’s driveway. After
    the final exchange, Morris exited the car and entered 707
    Albert, which authorities raided shortly thereafter.
    Gambini testified that no one else accessed the car in
    the interim.
    This evidence is sufficient to sustain the jury’s finding
    that Morris constructively possessed both the drugs
    and the firearm found in the Cirrus. Although Gambini
    did not see what Morris exchanged with his three
    visitors, it was reasonable for the jury to conclude, par-
    ticularly given the drugs, the gun, and the document in
    Morris’s name later found in the car, that Gambini wit-
    nessed three drug transactions. See 
    Brown, 328 F.3d at 355
    (noting that authorities “need not catch a defendant red-
    handed to satisfy the possession requirement”); 
    Starks, 309 F.3d at 1021-22
    (commenting that juries may use
    common sense to reach reasonable inferences from cir-
    cumstantial evidence). That Morris was dealing drugs
    from the Cirrus and possessed the drugs and gun found
    in the car is certainly a reasonable inference jurors could
    draw from these facts.
    This case bears notable similarity to United States v.
    Garrett, 
    903 F.2d 1105
    (7th Cir. 1990), where we upheld a
    conviction on a firearms charge when police appre-
    No. 08-2979                                                   17
    hended a man who was suspected of soliciting a prostitute.
    
    Id. at 1107,
    1110. The man was arrested just before he
    entered a vehicle that contained both drugs and a gun;
    neither the car nor the gun was registered to the defen-
    dant. 
    Id. at 1107-08.
    That the defendant had keys to the car,
    and that the gun and drugs were on the floor of the
    driver’s side, were facts sufficient to support the convic-
    tion. 
    Id. at 1110-12;
    cf. United States v. Moralez, 
    964 F.2d 677
    ,
    680 (7th Cir. 1992) (finding facts “even more incriminating
    than [those] in Garrett” when the defendant, who was
    apprehended driving a car containing nearly thirty pounds
    of marijuana, was “in complete control and possession of
    the vehicle”).
    Here, where Morris was seen driving the vehicle on
    multiple occasions in the days prior to the raid, where
    he was seen conducting probable drug transactions from
    the car on the day of the raid, and where he was the
    vehicle’s last known driver, the evidence was sufficient
    to find that he constructively possessed the heroin and
    the firearm found in the storage compartments of the
    car’s door. Given these circumstances, that the car
    was not registered in Morris’s name, that other people
    occasionally had access to the vehicle, and that there
    were no fingerprints found on the drugs or the gun do
    nothing to change that conclusion.
    2.   Possessing a Firearm “in Furtherance of” a Drug Traffick-
    ing Crime
    Having concluded that Morris constructively possessed
    the firearm and the drugs, it is a small step, given the
    18                                             No. 08-2979
    facts, to link the two together and conclude that there
    was ample evidence to convict Morris of possessing that
    firearm in furtherance of a drug trafficking crime. See
    18 U.S.C. § 924(c)(1)(A).
    Morris argues that the evidence failed to establish a
    “specific nexus between the particular weapon and the
    particular drug crime at issue,” quoting 
    Castillo, 406 F.3d at 815
    . Such a nexus is certainly required, but we fail to
    see what additional evidence the government could have
    shown short of Morris having had the gun on his person—
    which, as we have made clear, is not necessary. See 
    id. at 812
    (noting that a § 924(c) violation can be shown
    through either actual or constructive possession).
    To address Morris’s claim, we first reiterate the “par-
    ticular drug crime” that the jury found “furthered” by
    his possession of the firearm. It was described in Count
    One of the indictment, which alleged possession, with
    intent to distribute, 23.7 grams of heroin. This
    amount encompassed both the 23.6 grams of heroin
    authorities found in 707 Albert and the 0.09 grams of
    heroin recovered from the Cirrus.
    Morris attempts to distinguish between the drugs found
    in the car and those found in the house. In his eyes, the
    small amount of heroin from the car was not enough to
    imply any intent to distribute, only to use. The gun,
    therefore, which the government could link only to that
    smaller quantity, was not furthering any drug trafficking
    activity whatsoever.
    But Morris’s argument misses the mark. It is true that
    0.09 grams is well below the quantities that the govern-
    No. 08-2979                                               19
    ment’s expert testified would generally be considered
    a distributable amount. But such testimony is meant
    only as a guideline; it is incontrovertible that any amount
    is “distributable” when, as here, there is circumstantial
    evidence that the quantity of drugs, no matter how
    small, was in fact intended for distribution. That is what
    the jury must have concluded in this case—a reasonable
    conclusion given that police had just observed Morris
    engage in three probable drug transactions and later
    found additional drugs, packaged for resale, in the car
    from which those transactions occurred.
    Furthermore, as we just noted, the indictment, which
    charged Morris with the total amount of heroin dis-
    covered from both the house and the car, made no dis-
    tinction between the two locations where the drugs were
    located. Implicit in the jury’s guilty verdict on Count One
    was its finding that Morris possessed the quantity of
    heroin specified therein—which included the 0.09 grams
    from the car—for distribution, not personal use. Cf.
    United States v. Luciano, 
    329 F.3d 1
    , 6 (1st Cir. 2003) (con-
    cluding that a jury “inescapably found” that the
    defendant possessed heroin discovered both on his
    person and inside his house when the jury’s findings as
    to quantity mathematically mandated such a conclu-
    sion); 
    Castillo, 406 F.3d at 818
    (discussing Luciano). Thus,
    the “particular drug crime” involved both the drugs
    from the car and the house, and the statute requires
    only that the firearm be linked to this crime, not that it
    be linked to all, or any particular subset of, the under-
    lying drugs. See 18 U.S.C. § 924(c)(1)(A).
    20                                                No. 08-2979
    We turn, then, to the evidence tying the gun to that
    crime. It was substantial. To begin, the government’s
    expert, Sergeant Marc Welsh, testified that firearms
    were commonly used by drug dealers for protection from
    both police and other dealers.2 The evidence presented
    comported with Welsh’s testimony. The gun, partially
    concealed by a document bearing Morris’s name, was
    in the driver’s door. Morris was the driver. Police watched
    Morris engage in three exchanges that the jury could
    reasonably have concluded were drug transactions, the
    last of which occurred in 707 Albert’s driveway, where
    Morris parked and exited the car. Searches of the house
    where the car was parked and the car itself revealed
    23.6 and 0.09 grams of heroin, respectively. It was entirely
    reasonable for the jury to conclude that Morris possessed
    the gun to protect either himself, his drugs, or his
    money while he trafficked the drugs in the car and the
    house.
    Our case law, bolstered by cases from our sister circuits,
    leaves no room to question the jury’s conclusion under
    such facts. See United States v. Seymour, 
    519 F.3d 700
    , 715
    (7th Cir. 2008) (listing factors useful in analyzing the “in
    furtherance of” question, including the type of drug
    activity being conducted, the firearm’s accessibility
    and proximity to the drugs, and the circumstances under
    which the firearm was found); 
    Castillo, 406 F.3d at 815
    2
    Sergeant Welsh served as both an investigator and a wit-
    ness in this case. Below, we address the potential implications
    of Welsh’s dual role. See infra, pt. II.C.
    No. 08-2979                                              21
    (giving as an example of the required nexus “that the
    specific weapon at issue . . . [was] available for the pro-
    tection of the drug dealer or his drugs”); United States v.
    Gaston, 
    357 F.3d 77
    , 83 (D.C. Cir. 2004) (concluding that
    weapons were possessed “in furtherance of” when they
    were “strategically located” for quick and easy accessibil-
    ity); 
    Luciano, 329 F.3d at 3-4
    , 6 (upholding an “in further-
    ance of” conviction when the defendant was caught
    dealing drugs outside his apartment but firearms and
    additional drugs were found inside the apartment).
    Having reached the end of Morris’s arguments
    relating to the sufficiency of the evidence, we turn to his
    remaining claims, beginning with his challenge to the
    court’s decision not to instruct the jury on the meaning
    of “in furtherance of.”
    B. “In Furtherance Of” Instruction
    During the instructions conference, Morris’s counsel
    offered the following instruction pertaining to Count Two
    of the indictment, which charged Morris with possessing
    a firearm “in furtherance of” a drug trafficking crime,
    in violation of 18 U.S.C. § 924(c)(1)(A):
    The phrase “in furtherance of” as used in these
    instructions means to advance or promote the
    commission of the underlying drug trafficking
    offense. The government must prove a specific
    nexus between the firearm and the crime charged.
    After some discussion, and over defense counsel’s
    objection, the court declined to give the instruction.
    22                                               No. 08-2979
    We review the district court’s refusal to give a jury in-
    struction for an abuse of discretion. United States v. Muham-
    mad, 
    502 F.3d 646
    , 655 (7th Cir. 2007).
    The problem with Morris’s argument is that it rests
    on the faulty premise that “in furtherance of” requires
    definition. In Castillo, 
    406 F.3d 806
    , we noted that “an
    instructive line of cases holds that it is not error—plain
    or otherwise—to fail to give a definition of a statutory
    term or phrase that carries its natural meaning and that
    meaning is accessible to lay jurors.” 
    Id. at 821.
    Other
    cases have alluded to this same principle. Cf. United
    States v. Santos, 
    932 F.2d 244
    , 252 (3d Cir. 1991) (finding
    no plain error when the district court declined to define
    “preponderance of the evidence” because, in part, the
    phrase’s legal meaning was consistent with its common
    meaning); United States v. Sherwood, 
    770 F.2d 650
    , 654
    (7th Cir. 1985) (finding no plain error when the district
    court declined to define “willfully” because the
    ordinary meaning of the term likely did not confuse
    the jury).
    In Castillo, we discussed “in furtherance of” at length,
    commenting on the phrase’s “natural 
    meaning,” 406 F.3d at 814
    (“furthering, advancing or helping forward”
    (quotations omitted)), and stating that it “means what
    it says,” 
    id. at 815;
    see also 
    id. at 821
    (“ ‘[I]n furtherance
    of’ naturally and necessarily connotes more than mere
    presence or innocent possession.” (first emphasis added)).
    Thus, although the court was free to give an instruc-
    tion defining “in furtherance of,” we determined that it
    was not error to decline to do so. 
    Id. at 821-22.
    No. 08-2979                                                  23
    In an attempt to minimize Castillo’s weight, Morris
    notes, correctly, that the discussion regarding the plain
    meaning of “in furtherance of” was not the core holding
    of the case. Indeed, by our count, the phrase’s plain
    meaning was one of three reasons we provided to
    support our conclusion that the district court did not
    plainly err in refusing to define “in furtherance of.” 
    Id. at 820-21.
    But that fact does nothing to detract from the
    import of our comments, which was that the phrase
    carries a readily understood meaning that jurors compre-
    hend without additional definition.
    Further, the facts of Castillo are closer to those now
    before us than Morris would have us believe. A second
    factor we found important in our “in furtherance of”
    discussion was the comments made by the attorneys
    during closing arguments. 
    Id. There, the
    prosecutor said
    the following: “So how did that shotgun further a drug
    crime? That’s the question. Did it further—simply did it
    help the drug crime? Did it aid a drug crime in some way?
    How did that shotgun help this defendant possess with
    intent to distribute narcotics?” 
    Id. at 820.
      Here, the prosecutor did not use words like “help” or
    “aid.” But taken in context, his comments left little
    doubt about the meaning of “in furtherance of”:
    [W]hat furthers the crime of drug trafficking.
    Protection of your product, protection of your
    proceeds, protection of your person. . . . It’s impor-
    tant for drug dealers to protect themselves, first
    and foremost, and almost as importantly their
    product and their cash, and that’s exactly what
    24                                             No. 08-2979
    happened here. The defendant had the gun in the
    driver’s side door just below the drugs that he
    was selling, protecting that product, protecting
    his person, and he was using guns to protect the
    money that he was generating from the heroin
    sales.
    We conclude that the district court did not err by refus-
    ing to include a jury instruction defining the phrase “in
    furtherance of,” as used in 18 U.S.C. § 924(c)(1)(A).
    The words have a plain meaning that is easily under-
    stood by jurors, rendering any definitional instruction
    perhaps helpful but not necessary. This conclusion is
    bolstered by the prosecutor’s comments during closing
    arguments, which, to the extent further illumination
    might have been desired, provided additional light.
    C. Admission of Sergeant Welsh’s Expert Testimony
    Morris’s final argument is that the district court
    should not have admitted testimony by Sergeant Marc
    Welsh, who testified as an expert for the government. The
    government offered Welsh’s testimony to explain com-
    mon practices of street-level narcotics sales, including
    what quantities of drugs are generally possessed
    for purposes of distribution rather than individual con-
    sumption. Welsh testified that 23.7 grams of heroin
    “would be consistent with distribution quantity.”
    The rub, however, is that Welsh was also the supervisor
    of the MNU at the time the unit raided 707 Albert. Testi-
    mony by other members of the search team and by
    No. 08-2979                                                25
    Welsh himself on cross-examination made it clear that
    Welsh was personally involved in executing the warrant
    on the house. Morris claims that Welsh’s dual role—as both
    investigator and expert witness—caused his testimony to
    run afoul of the Federal Rules of Evidence, particularly
    Rules 704(b) and 403. We disagree.
    Government prosecutors often call expert witnesses to
    discuss common practices employed by drug dealers.
    See United States v. Foster, 
    939 F.2d 445
    , 451 & n.6 (7th
    Cir. 1991) (collecting cases and noting that our circuit
    “is quite familiar with the use during trial of expert
    testimony as to the methods used by drug dealers”);
    see also United States v. Anderson, 
    61 F.3d 1290
    , 1297 (7th
    Cir. 1995). We have upheld the practice in a number of
    contexts related to the narcotics trade. See United States
    v. Upton, 
    512 F.3d 394
    , 401 (7th Cir. 2008) (discussing
    various contexts); see also, e.g., United States v. Gonzalez,
    
    933 F.2d 417
    , 428-29 (7th Cir. 1991) (use of short phone
    calls to avoid detection); United States v. Solis, 
    923 F.2d 548
    , 551 (7th Cir. 1991) (use of beepers); United States v.
    Rollins, 
    862 F.2d 1282
    , 1292 (7th Cir. 1988) (use of
    narcotics code words).
    For many drug crimes, the government bears the
    burden of proving that the defendant possessed a given
    state of mind—often, as here, the intent to distribute
    narcotics. See 21 U.S.C. § 841(a)(1). But it is usually diffi-
    cult or impossible to provide direct evidence of a defen-
    dant’s mental state. Cf. Pavlick v. Mifflin, 
    90 F.3d 205
    , 209
    (7th Cir. 1996) (“Direct evidence of knowledge is diffi-
    cult—sometimes impossible—to obtain; therefore the
    26                                                 No. 08-2979
    Supreme Court has held that [a defendant’s mental state]
    need not be proven by direct evidence.”). Instead, an
    individual’s intent is generally proven through circumstan-
    tial evidence, often in the form of expert testimony. See,
    e.g., United States v. Lipscomb, 
    14 F.3d 1236
    , 1239-43 (7th Cir.
    1994) (examining in depth the role of expert testimony
    by law enforcement officers as circumstantial evidence
    of an individual’s intent); 
    Solis, 923 F.2d at 551
    (finding
    expert testimony helpful “to establish . . . intent through
    circumstantial evidence”); cf. 
    Pavlick, 90 F.3d at 209
    (“Whether a [defendant acted with a requisite mental
    state] is a question of fact subject to demonstration in the
    usual ways, including inference from circumstantial
    evidence.” (quotations omitted)). As we have explained,
    experts “simply describe[] in general terms the
    common practices of those [hypothetical individuals]
    who clearly do possess the requisite intent, leaving un-
    stated the inference that the defendant, having been
    caught engaging in more or less the same practices, also
    possessed the requisite intent.” 
    Lipscomb, 14 F.3d at 1239
    .
    The jury is then left to decide whether to make the
    logical connection from the expert’s testimony to the case
    at hand.
    In offering expert testimony as circumstantial evidence
    of a defendant’s intent, however, courts must be wary that
    the expert witness not cross into the jury’s realm or
    otherwise risk prejudicing the jury. See Fed. R. Evid. 704(b),
    403. Morris contends Welsh’s testimony did both.
    Rule 704 governs opinions that witnesses offer on so-
    called “ultimate issues.” The rule is divided into two
    No. 08-2979                                                    27
    parts, a general rule and an exception. The general rule
    states that “testimony in the form of an opinion or infer-
    ence otherwise admissible is not objectionable because it
    embraces an ultimate issue to be decided by the trier of
    fact.” Fed. R. Evid. 704(a). The exception provides as
    follows:
    No expert witness testifying with respect to the
    mental state or condition of a defendant in a
    criminal case may state an opinion or inference
    as to whether the defendant did or did not have
    the mental state or condition constituting an
    element of the crime charged or of a defense
    thereto. Such ultimate issues are matters for the
    trier of fact alone.
    
    Id. 704(b).3 Under
    the rule, the potential problem arises when
    experts stray from their analysis of detached facts and offer
    opinions regarding the defendant’s actual mental state;
    such conclusions are meant to be the exclusive province
    of the jury. It must be clear from the expert’s testi-
    mony that he “was merely identifying an inference that
    might be drawn from the circumstances surrounding the
    defendant’s arrest, and was not purporting to express
    an opinion as to the defendant’s actual mental state.”
    
    Lipscomb, 14 F.3d at 1240
    (quotations omitted).
    3
    In Lipscomb, we questioned the applicability of Rule 704(b)
    to non-medical experts but ultimately acknowledged that the
    rule limits the expert testimony of law enforcement officials
    as 
    well. 14 F.3d at 1242
    ; see also United States v. Mancillas, 
    183 F.3d 682
    , 706 (7th Cir. 1999).
    28                                              No. 08-2979
    Rule 403, meanwhile, permits a court to exclude
    evidence “if its probative value is substantially out-
    weighed by the danger of unfair prejudice.” Testimony
    runs the risk of being overly prejudicial when, as here,
    the expert witness was a law enforcement officer who
    was also involved in the investigation at issue. See 
    Upton, 512 F.3d at 401
    ; 
    Lipscomb, 14 F.3d at 1242
    ; see also United
    States v. Alvarez, 
    837 F.2d 1024
    , 1030 (11th Cir. 1988)
    (discussing the “serious risk of undue prejudice” that
    arises from a government agent testifying as an expert);
    United States v. Brown, 
    776 F.2d 397
    , 401 n.6 (2d Cir. 1985)
    (noting that the risk of prejudice is increased when the
    expert opinion “is given by the very officers who were
    in charge of the investigation” (quotations omitted)). The
    danger is “that the jury may attach undue weight to
    the officer’s testimony, either by mistaking an expert
    opinion for what is really only an eyewitness observa-
    tion, or by inferring that the officer’s opinion about the
    criminal nature of the defendant’s activity is based on
    knowledge of the defendant beyond the evidence at
    trial.” 
    Lipscomb, 14 F.3d at 1242
    (quotations omitted).
    We find that the content and context of Sergeant
    Welsh’s testimony avoided the potential pitfalls contem-
    plated by Rules 704 and 403. Perhaps most importantly,
    Welsh testified only as an expert. This is a marked differ-
    ence from previous cases dealing with this issue, where
    the relevant witness took the stand as both a lay witness
    and an expert. See, e.g., 
    Upton, 512 F.3d at 398
    ; United
    States v. Mansoori, 
    304 F.3d 635
    , 653 (7th Cir. 2002);
    
    Lipscomb, 14 F.3d at 1238
    ; United States v. de Soto, 
    885 F.2d 354
    , 360 (7th Cir. 1989).
    No. 08-2979                                              29
    Here, the government produced numerous members
    of the Metro Narcotics Unit who testified to the events of
    June 2, 2005, the day of the raid on 707 Albert. Sergeant
    Welsh was not one of them. Instead, Welsh’s testimony
    focused exclusively on his expert opinions regarding the
    drug trade in Rockford and his analysis of the facts
    related to Morris’s case, e.g., that 23.7 grams of heroin,
    possessed by anyone, “would be consistent with distribu-
    tion quantity.” Never once did Welsh refer to Lonnie
    Morris specifically or even allude to his impressions or
    recollections from the day of the search, nor did he
    express an opinion about Morris’s actual state of mind. See
    
    Mancillas, 183 F.3d at 706
    (concluding that a dual-role
    witness “based his opinion on his knowledge of the
    drug trade rather than on any alleged or conceived famil-
    iarity with the working of [the defendant’s] mind”);
    
    Lipscomb, 14 F.3d at 1243
    .
    This is not to say that the jury was unaware of Welsh’s
    role in the Morris investigation. Several government
    witnesses referred to Sergeant Welsh during their testi-
    mony, and Welsh acknowledged on the stand that he
    was the supervisor of the MNU and had been involved
    in the search of 707 Albert. Notably, however, virtually
    all of Welsh’s statements regarding his role in the investi-
    gation were not brought out by the government but
    rather were elicited by defense counsel on cross-exam-
    ination.
    The government’s decision not to use Welsh as a fact
    witness was an important step in avoiding potential
    juror confusion or crossing the line into improper opinion.
    30                                            No. 08-2979
    See 
    Mansoori, 304 F.3d at 654
    (recognizing a reduced
    potential for prejudice where the government structures
    testimony “in such a way as to make clear when the
    witness is testifying to facts and when he is offering
    his opinion as an expert”).
    In addition, the district court gave a standard instruc-
    tion to the jury, reminding it of the following:
    You should judge [expert] testimony in the same
    way that you judge the testimony of any other
    witness. The fact that such a person has given an
    opinion does not mean you’re required to accept
    it. Give the testimony whatever weight you think
    it deserves considering the reasons given for the
    opinion, the witness’ qualifications, and all the
    other evidence in the case.
    We have found the use of similar instructions to be an-
    other factor mitigating against jury confusion. See, e.g.,
    
    id. (finding it
    helpful when the jury was instructed that
    “the fact an expert has given an opinion does not mean
    that it is binding upon you or that you are obligated to
    accept the expert’s opinion as to the facts”).
    Given these facts, we conclude that the district court
    did not admit Sergeant Welsh’s testimony in violation of
    Rule 704(b) because it was made clear “in the nature of
    the examination[] that the opinion [was] based on the
    expert’s knowledge of common criminal practices, and
    not on some special knowledge of the defendant’s
    mental processes.” 
    Lipscomb, 14 F.3d at 1242
    . For the same
    reasons, Welsh’s testimony was not unfairly prejudicial
    and did not violate Rule 403.
    No. 08-2979                                              31
    III. C ONCLUSION
    First, there was sufficient evidence to sustain Morris’s
    conviction on the three counts contained in the indict-
    ment. Second, the district court did not err by refusing to
    define the phrase “in furtherance of” in its instructions to
    the jury. Finally, the court properly admitted the expert
    testimony of Sergeant Welsh. We A FFIRM Morris’s con-
    viction.
    8-10-09