In the

United States Court of Appeals

For the Seventh Circuit ____________________

No. 18-2023

UNITED STATES OF AMERICA,

Plaintiff-Appellee,

v.

DERRICK W. JOHNSON,

Defendant-Appellant.

____________________

Appeal from the United States District Court for the

Western District of Wisconsin.

No. 17-CR-72 — William M. Conley, Judge.

____________________

ARGUED NOVEMBER 6, 2018 — FEBRUARY 21, 2019

____________________

Before WOOD, Chief Judge, and EASTERBROOK and KANNE,

Circuit Judges.

KANNE, Circuit Judge. Derrick Johnson appeals his conviction for possession of a firearm in furtherance of a drug trafficking crime. Police arrested him at a Madison, Wisconsin,

bar carrying five hydrocodone pills, two cell phones, gem 

packs containing marijuana residue, a plastic bag of antihistamine, and a loaded pistol. Johnson pled guilty to possession 

of a controlled substance with intent to deliver but went to 
2 No. 18-2023

trial on the firearm charge. On appeal, Johnson claims the district court committed reversible error in three ways. First, he 

claims the jury instructions misstated the law and confused 

the jury. Second, he contends that the district court should not 

have admitted the government’s proffered expert testimony. 

Lastly, Johnson argues the government presented insufficient 

evidence to support his conviction. We affirm.

I. BACKGROUND

A Madison, Wisconsin, police officer named Joseph Buccellato recognized Derrick Johnson outside of a campus bar 

on June 17, 2017. Johnson wore a jacket; a wardrobe choice 

that struck the officer as odd for a warm summer night. He 

suspected Johnson was armed. After confirming an outstanding warrant for Johnson’s arrest, Buccellato and another officer confronted and attempted to apprehend him. Johnson 

wrestled free from the pair and made a short-lived escape into 

the bar where the officers ultimately arrested him. The officers searched Johnson and discovered a Crown Royal whiskey 

bag containing small plastic bags known as gem packs. Some 

gem packs remained unused, others contained marijuana residue, and five gem packs each contained a hydrocodone pill. 

The officers also found two cell phones and another plastic 

bag filled with powdered antihistamine. Data pulled from 

one of the cell phones revealed Facebook conversations in 

which Johnson appeared to arrange drug deals. Most significantly, the officers discovered a loaded pistol with a bullet in 

its chamber zipped up in Johnson’s jacket pocket.

A grand jury indicted Johnson with one count of possessing hydrocodone with intent to distribute and one count 

of possessing a handgun in furtherance of a drug trafficking 

crime in violation of 21 U.S.C. § 841(a)(1) and 18 U.S.C. 
No. 18-2023 3

§ 924(c), respectively. Johnson pled guilty to possessing hydrocodone with intent to distribute but went to trial on the 

firearm charge.

Prior to trial, the government designated Bureau of Alcohol, Tobacco, and Firearms (“ATF”) Special Agent Michael 

Aalto as an expert witness on drug distribution and trafficking. The government included Aalto’s curriculum vitae with its 

expert testimony notice. Special Agent Aalto’s law enforcement career spanned more than twenty years. He spent more 

than half of his time with the ATF, where he served undercover in the drug trade and worked with informants. The expert witness notification explained that Aalto would offer his 

opinion on the habits, customs, and practices of drug dealers. 

Specifically, Aalto would testify about the different items discovered in Johnson’s possession during his arrest and their 

relationship to drug dealing. According to the government, 

this testimony would help the jury understand how Johnson 

used the pistol “in furtherance of” the drug crime. The government also identified Buccellato as an expert witness.

Johnson moved in limine to exclude the testimony of both 

Aalto and Buccellato as irrelevant. Johnson argued that because he pled guilty to possession with intent to distribute, 

the government no longer needed to prove he dealt drugs. Alternatively, Johnson contended that the district court should 

weigh and exclude Aalto’s and Buccellato’s testimony under 

Federal Rule of Evidence 702.

The district court held a hearing and, relying on our cases 

describing such testimony as helpful and relevant, rejected 

Johnson’s Rule 702 argument. The court also noted that expert 

testimony about why drug dealers possess guns and how 
4 No. 18-2023

they use them provides helpful information for lay jurors unfamiliar with the clandestine narcotics world and accordingly 

rejected Johnson’s relevance argument. The court explained 

that testimony concerning the other items Buccellato recovered from Johnson during the arrest could provide context for

Johnson’s firearm possession.

At trial, Aalto testified to a variety of factors. Based on the 

Facebook conversation data taken from one of Johnson’s 

phones, Aalto concluded that Johnson made an appointment 

to sell Xanax two and a half hours before his arrest. Aalto explained that drug dealers commonly use gem packs to package drugs for sale. The government asked Aalto about the relationship between drugs and guns. He observed that due to 

drug dealing’s dangerous nature, guns and drugs go hand-inhand and concluded “[w]here there’s guns, there’s drugs, and 

where there’s drugs, there’s guns.” On cross-examination by 

Johnson’s counsel, Aalto walked back his broad assertion, 

noting that drugs and guns go together not always, but 

“[m]ost of the time.”

As trial closed, the district court considered the parties’

proposed jury instructions. The government asked the court 

to supplement the pattern jury instruction explaining the “in 

furtherance of” element with factors identified in United States 

v. Duran, 407 F.3d 828, 845 (7th Cir. 2005). Conversely, Johnson requested that the district court borrow a jury instruction 

used in a previous case which included a dictionary definition 

of the word “facilitate.” Over Johnson’s objection, the district 

court ultimately administered a pattern-based jury instruction but added both the dictionary definition of “facilitate” 

and the Duran factors the court deemed relevant to the case. 
No. 18-2023 5

The court omitted Duran factors related to the gun’s legal status because it previously granted the government’s motion in 

limineto exclude evidence about whether Johnson legally possessed the pistol.

In the following presentation of the jury instruction, the 

bolded text highlights the added Duran factors. Johnson’s requested dictionary language defining “facilitate” is italicized:

As used in the second element of Count 2, a person 

possesses a firearm in furtherance of a drug trafficking crime if the firearm furthers, advances, moves 

forward or facilitates the crime. The mere presence 

of a firearm at the scene of a drug trafficking crime 

is not enough to establish that the firearm was possessed in furtherance of the crime. There must be 

some additional connection between the firearm and 

the crime. In making this determination, you should 

consider all of the evidence, including: the type of 

drug activity that is being conducted; the type, 

value and amount of drugs; the accessibility of the 

firearm; the type of the firearm; whether the firearm 

is loaded; the proximity of the firearm to drugs or 

drug profits; the time and circumstances under 

which the gun is found; and whether the firearm makes 

the crime possible, easier to commit, or more likely to succeed. While these factors or any other factor you 

deem important may be useful, they are not to be 

applied rigidly or with equal weight. The weight, if 

any, you give these or other factors is up to you. No 

factor or combination of factors is dispositive. Instead, you are to be guided primarily by common 

sense in deciding if “the firearm furthered, advanced, moved forward or facilitated the crime.”

(R. 72 at 6). 
6 No. 18-2023

The jury convicted Johnson. He subsequently challenged

the sufficiency of the evidence under Federal Rule of Criminal 

Procedure 29, which the district court denied. He appealed.

II. ANALYSIS

Johnson argues the district court erred in three ways. First,

he contends the court administered jury instructions that misstated the law and confused the jury. Second, he challenges 

the admission of the government’s expert witness testimony. 

Third, Johnson maintains that insufficient evidence supported his conviction.

A. The District Court Administered Adequate Jury Instructions

Johnson argues that the jury instructions misstated the law 

and confused the jury. He objects to the instructions because

the district court included the Duran factors in the “in furtherance of” instruction and placed his proposed dictionary definition language among the factors.

We review whether a jury instruction accurately states the 

law de novo. United States v. DiSantis, 565 F.3d 354, 359 (7th Cir. 

2009). District courts can improve pattern jury instruction language or “start from scratch.” United States v. Edwards, 869 

F.3d 490, 500 (7th Cir. 2017). We give the district court discretion on precise wording “so long as the final result, read as a 

whole, completely and correctly states the law.” DiSantis, 565 

F.3d at 359 (quoting United States v. Gibson, 530 F.3d 606, 609 

(7th Cir. 2008).

The jury convicted Johnson of possessing a firearm in furtherance of a drug crime. 18 U.S.C. § 924(c). The statute provides that “[a]ny person who, during and in relation to any 

crime of violence or drug trafficking crime ... in furtherance 
No. 18-2023 7

of any such crime, possesses a firearm, shall ... be sentenced 

to a term of imprisonment of not less than 5 years[.]”

§ 924(c)(1)(A)(i). 

We previously examined the statute’s “in furtherance of”

language and determined it requires that the weapon “further, advance, move forward, promote or facilitate the drugtrafficking crime.” Duran, 407 F.3d at 840 (citing United States 

v. Castillo, 406 F.3d 806 (7th Cir. 2005)). The recurring factual 

inquiry in cases where an arrested drug dealer possesses (but

does not brandish) a firearm centers on the dealer’s purpose 

for carrying the weapon. In Duran, we recognized the difficulty in distinguishing between lawful carrying for personal 

protection and carrying to protect a drug stash. Duran, 407 

F.3d at 840. 

To help the juries, we borrowed a list of factors articulated 

by the Fifth Circuit including, “the type of drug activity that 

is being conducted, accessibility of the firearm, the type of the 

weapon, whether the weapon is stolen, the status of the possession (legitimate or illegal), whether the gun is loaded, 

proximity to drugs or drug profits, and the time and circumstances under which the gun is found.” Id. (quoting United 

States v. Ceballos-Torres, 218 F.3d 409, 414–15 (5th Cir.), modified on denial of rehearing, 226 F.3d 651 (5th Cir. 2000)). As 

we noted in Duran, these factors are not exhaustive, nor are 

they necessary. 407 F.3d at 840. Overall, we emphasize common sense as the jury’s guide. Id.

Here, Johnson raises two main objections to the instruction. First, he believes the instruction’s arrangement led the 

jury to believe it could discard part of the legal standard. Specifically, the district court added the dictionary language de-
8 No. 18-2023

fining “facilitate” to the end of the listed Duran factors. Because the instruction described the Duran factors as optional, 

Johnson believes the jury could have interpreted the instruction to mean that it was optional to find that the gun “facilitated” the drug crime. And because “facilitate” is one of the 

words used to describe “furthered,” the jury could have 

thought that it was optional to find that Johnson possessed the 

gun “in furtherance of” his drug dealing. Second, Johnson argues that the district court abused its discretion by including

the Duran factors in the instruction. Johnson complains that 

the court only included factors detrimental to his case and excluded potentially helpful factors. Moreover, he claims that 

even though the commentary to the pattern instruction recommends providing jurors with the Duran factors, providing 

them in this case distracted the jury from its primary task.

We disagree. The administered jury instruction included 

the critical Castillo standard twice—at the beginning and end. 

Although the district court placed the dictionary language 

prior to a sentence advising the jury to give the Duran factors

the weight—if any—it deemed appropriate, the instruction 

definitively and properly concluded with Castillo’s standard. 

The instruction effectively gave the jury its task, listed considerations to weigh in its discretion, and then iterated the 

proper legal standard. The instruction clearly informed the 

jury that it must ultimately determine whether “the firearm 

furthered, advanced, moved forward or facilitated the crime.”

Castillo, 406 F.3d at 821. By bookending the non-patterned language with the Castillo standard, the instruction sufficiently 

informed the jury of its task of determining whether he possessed the firearm in furtherance of his drug dealing.
No. 18-2023 9

We similarly disagree with Johnson’s argument that the 

district court abused its discretion by including the Duran factors or prejudiced him by including only a few. We previously 

explained that not all the Duran factors are equally helpful in 

a given situation. United States v. Brown, 724 F.3d 801, 803 (7th 

Cir. 2013). Because the instruction clearly articulated the Castillo standard, we doubt that listing relevant Duran factors 

caused the jury significant confusion. Further, the instruction 

cautioned the jury to only consider the factors to the extent 

they proved helpful and suggested that the jury could consider additional, unlisted factors.

Although the jury instructions accurately stated the law in 

this case, we re-emphasize that common sense should serve 

as the jury’s primary guide in these cases. Duran, 407 F.3d at 

840. To that end, we urge district courts drafting jury instructions to consider whether “less is more” in each case. While 

the Duran factors provide helpful considerations, simple and 

succinct instructions invite the jury to rely on its own intuition 

and common sense in resolving the cases. Gehring v. Case 

Corp., 43 F.3d 340, 344 (7th Cir. 1994) (“Good instructions use 

simple words in short, concrete sentences.”); see also Brown, 

724 F.3d at 803 (7th Cir. 2013) (noting that “[i]t can be easier 

to determine ‘furtherance’ by a holistic analysis than by dissecting the issue into parts.”).

B. The District Court Did Not Err by Admitting the Government’s Expert Witness Testimony

Johnson argues that the district court erroneously admitted Special Agent Aalto’s expert testimony. He objects to 

Aalto’s testimony on two grounds. First, he argues that the 

district court should have excluded Aalto’s testimony about 

the relationship between drugs and guns because it failed to 
10 No. 18-2023

satisfy the requirements of Federal Rule of Evidence 702 and 

Daubert v. Merrell Dow Pharm., Inc., 509 U.S. 579 (1993). Alternatively, Johnson contends that the court should have excluded as irrelevant any portion of Aalto’s testimony not directly related to the relationship between drugs and guns under Federal Rule of Evidence 401.

1. The District Court Did Not Abuse Its Discretion by Admitting Aalto’s Testimony Under Rule 702

The admission of expert testimony is governed by Federal 

Rule of Evidence 702 and Daubert. See C.W. ex rel. Wood v. Textron, Inc., 807 F.3d 827, 834 (7th Cir. 2015). Under Rule 702, 

expert testimony must assist the trier of fact and demonstrate 

sufficient reliability. Id. 

“We employ a two-step standard of review in cases challenging a district court’s admission or exclusion of the testimony of an expert.” Textron, 807 F.3d at 835. We first review 

the district court’s application of Daubert’s framework de novo. 

Id. Second, if the district court properly applied Daubert, we 

review its decision not to exclude expert testimony for an 

abuse of discretion. Id. We afford the district court’s evidentiary rulings special deference and find an abuse of discretion 

“only where no reasonable person could take the view 

adopted by the trial court.” United States v. Causey, 748 F.3d 

310, 316 (7th Cir. 2014) (quotation omitted).

“The Supreme Court has made clear that in applying Rule 

702, district courts serve a gatekeeping function and must ensure that the expert testimony at issue ‘both rests on a reliable 

foundation and is relevant to the task at hand.’” United States 

v. Cruz-Velasco, 224 F.3d 654, 660 (7th Cir. 2000) (quoting Daubert, 509 U.S. at 597). In Kumho Tire Co. v. Carmichael, the Court 
No. 18-2023 11

explained that when testing the reliability of an expert opinion, courts must adjust the Daubert “gatekeeper” factors to fit 

the facts of the particular case at issue. 526 U.S. 137, 147 (1999).

“Our court has long recognized that testimony regarding 

the methods used by drug dealers is helpful to the jury and 

therefore a proper subject of expert testimony.” United States 

v. Winbush, 580 F.3d 503, 510–11 (7th Cir. 2009); see also United 

States v. Foster, 939 F.2d 445, 452 (7th Cir. 1991) (“‘The investigator and the expert witness both serve as a link to the drug 

culture in providing the jury with [an] understanding of the 

intricate patterns and modus operandi’ of those involved in narcotics trafficking.” (alteration in original) (quoting United 

States v. Gonzalez, 933 F.2d 417, 428–29 (7th Cir. 1991)).

Johnson argues that the district court improperly applied 

the Daubert framework to Aalto’s testimony and instead 

deemed Aalto’s testimony per se reliable and admissible. Specifically, Johnson objects to the district court’s characterization of the case law concerning law enforcement expert testimony about drug dealers’ modus operandi. He claims that the 

district court failed to seriously consider whether and how 

Aalto’s experience and training supported his opinion concerning relationship between drugs and guns.

We disagree. Johnson’s objections to the admission of 

Aalto’s testimony bear a striking resemblance to those raised

in United States v. Tingle, 880 F.3d 851, 854 (7th Cir.), cert. denied, 138 S. Ct. 1567 (2018). In that case, the defendant faced 

charges for possessing and distributing methamphetamine 

and possessing a firearm in furtherance of a drug trafficking 

crime. Id. at 852. He argued that the district court errantly allowed the government’s witness to testify as an expert, “without properly examining his credentials or considering 
12 No. 18-2023

whether expert testimony would assist the jury.” Id. at 854. 

We explained that the district court need not conduct a Daubert hearing, “‘where the reliability of an expert’s methods is 

properly taken for granted.’” Id. (quoting Kumho Tire, 526 U.S. 

at 152). And we relied on the witness’s expertise—with 16 

years of experience with the DEA and 14 years of experience 

with the Missouri State Highway Patrol—to determine that he 

was clearly “qualified to testify as an expert in his field and 

that his testimony could be helpful to the jury.” Tingle, 880 

F.3d at 854. We also noted expert’s formal law enforcement 

training and heavy involvement in drug cases. Id. Even before 

Tingle, this court explained that such testimony is reliable 

when based both on significant law enforcement experience 

and an application of the case’s facts. United States v. Allen, 269 

F.3d 842, 846 (7th Cir. 2001).

Here the district court similarly declined to conduct a 

Daubert hearing concerning Aalto’s expert testimony on the 

relationship between drugs and guns in the narcotics underworld. However, the record reflects that the court considered

Aalto’s significant qualifications and experience, and 

properly applied the Daubert framework.

As to Johnson’s objections to Aalto’s methodologies, the 

district court correctly explained that the premise of admitting testimony like Aalto’s relies on the notion that jurors “are 

not well versed in the behavior of drug dealers.” Winbush, 580 

F.3d at 511 (quoting Foster, 939 F.2d at 452). The court noted 

that Aalto could relay to the jury behaviors he personally witnessed among drug dealers. These experiences could help explain how and why drug dealers possess firearms. In other 

words, Aalto’s shared experiences gave the jurors context for

an unfamiliar subculture and provided them with a better 
No. 18-2023 13

foundational understanding than they might glean from television or popular culture. Foster, 939 F.2d at 452. This testimony was relevant to Johnson’s case because it helped the 

jury better evaluate whether his firearm possession was consistent with and typical to the drug trade.

2. The District Court’s Properly Admitted Aalto’s Other Testimony

Johnson additionally contends that the district court erred 

because it admitted Aalto’s testimony about the other items 

Johnson possessed during the arrest and Johnson’s Facebook 

messages. Because the government only needed to prove the 

firearm charge, Johnson believes the district court should 

have excluded evidence unrelated to the firearm as irrelevant 

under Federal Rule of Evidence 401.

“The standard of review for the admission of evidence

where relevance is at issue is ... abuse of discretion.” United 

States v. Gill, 58 F.3d 334, 337 (7th Cir. 1995). District courts 

properly admit evidence as relevant if “it has any tendency to 

make a fact more or less probable than it would be without 

the evidence.” Fed. R. Evid. 401(a).

Johnson objects to Aalto’s testimony about how his activities resembled those of the typical drug dealer. This includes 

Aalto’s testimony on how drug dealers often carry multiple 

cell phones, how they prepackage drugs, how Johnson’s Facebook messages showed him setting up a drug deal using 

industry slang, and how much money drug dealers carry on 

them at a given time.

We cannot agree with Johnson that the district court 

abused its discretion by admitting this testimony. Aalto’s tes-
14 No. 18-2023

timony provided the jury with relevant context clues concerning Johnson’s firearm. While Johnson could have been carrying a firearm for a lawful purpose—as many citizens do—the 

other items in Johnson’s possession and his Facebook messages undoubtedly changed the situation’s complexion.

Aalto’s testimony showed that Johnson carried many regular 

tools of a drug dealer and the firearm’s presence among them

was not merely incidental.

C. Sufficient Evidence Supported Johnson’s Conviction

Lastly, Johnson argues that the government presented insufficient evidence to support his conviction. Specifically, he 

believes that the government failed to provide evidence linking his firearm to drug dealing. He urges that upholding the

district court’s ruling effectively sets a standard that simply 

possessing a gun while simultaneously possessing drugs sufficiently supports a conviction under 18 U.S.C. § 924(c).

“We review sufficiency of evidence challenges in the light 

most favorable to the prosecution and will only reverse if we 

determine that no reasonable finder of fact could find the defendant guilty beyond a reasonable doubt.” United States v. 

Eller, 670 F.3d 762, 765 (7th Cir. 2012). Our role is “limited to 

ensuring that a valid legal theory supports the conviction and 

that there is some evidence from which a rational jury could 

find in favor of that legal theory.” United States v. Amaya, 828 

F.3d 518, 525 (7th Cir. 2016) (quoting Duran, 407 F.3d at 842).

We previously explained that, “the mere presence of a firearm in a home or location where drugs are sold is not itself 

sufficient to prove the ‘in furtherance of’ prong of the statute 

and that there must be some nexus or connection between the 

firearm and the drug-selling operation.” Eller, 670 F.3d at 765. 
No. 18-2023 15

Although we continue to caution that juries must find reasonable connections (beyond mere proximity) linking the firearm 

and the drug operation, we also iterate that a “fact finder is 

certainly entitled to come to the common-sense conclusion 

that when someone has both drugs and a firearm on their person, the gun is present to further drug trafficking.” Castillo, 

406 F.3d at 815 (quoting United States v. Lomax, 293 F.3d 701, 

706 (4th Cir. 2002)).

We disagree with Johnson’s claim that the government 

presented insufficient evidence to support his conviction. 

Johnson’s Facebook messages indicate that he conducted a 

drug deal earlier the same evening. When Officer Buccellato

made the arrest, Johnson’s pockets contained controlled substances that he packaged individually for sale. Johnson also 

carried other drug-dealing accoutrements. The loaded pistol 

had a bullet in its chamber. A reasonable fact finder could determine that Johnson carried a pistol to protect himself and 

his drugs on the night he was arrested. Altogether, we believe

sufficient evidence supported the jury’s verdict finding Johnson guilty beyond a reasonable doubt.

III. CONCLUSION

The district court administered jury instructions that correctly stated the law and sufficiently charged the jury with its 

task of determining whether Johnson possessed his firearm in 

furtherance of a drug trafficking crime. The district court permissibly admitted Special Agent Aalto’s testimony, which 

Aalto based on significant law enforcement training and drug 

enforcement experience. Lastly, the government presented 

sufficient evidence to support Johnson’s conviction. 

AFFIRMED.