The government prosecuted Justus Rosemond for his role in a drug transaction that turned violent. Rosemond and confederates arranged to sell marijuana to buyers; during the exchange, the buyers attempted to abscond with the drugs (and/or money), prompting one of Rosemond's associates to fire a handgun. Rosemond was charged with drug trafficking offenses and with violating 18 U.S.C. § 924(c), which criminalizes using or carrying a firearm during and in relation to a drug trafficking crime or crime of violence. The § 924(c) charge was pursued on an aiding-and-abetting theory under 18 U.S.C. § 2 rather than on the basis that Rosemond himself fired or carried the gun. At trial, the district court instructed the jury that it could convict if Rosemond knowingly participated in the drug deal and a confederate used or carried a gun, without requiring the jury to find that Rosemond had advance knowledge of the firearm before or during the crime at a point when he could have chosen to withdraw. The jury convicted on the § 924(c) count. On appeal, the Tenth Circuit affirmed, holding that the instructions sufficiently captured the law of aiding and abetting in this context. The Supreme Court granted certiorari to resolve whether aiding-and-abetting liability for a § 924(c) offense requires proof of advance knowledge that a firearm would be used or carried.
Does a conviction for aiding and abetting a violation of 18 U.S.C. § 924(c) require proof that the defendant had advance knowledge that a confederate would use or carry a firearm during and in relation to the predicate drug trafficking crime or crime of violence?
A defendant is liable for aiding and abetting under 18 U.S.C. § 2 only if he takes an affirmative act in furtherance of the offense with the intent of facilitating its commission. For a § 924(c) offense (use or carry of a firearm during and in relation to a predicate crime), the government must prove the accomplice (1) actively participated in the underlying predicate crime and (2) had advance knowledge that a confederate would use or carry a firearm in the commission of that crime—knowledge obtained at a time when the accomplice could realistically withdraw or otherwise refrain from further participation.
Yes. To convict a defendant of aiding and abetting a § 924(c) offense, the government must show that the defendant actively participated in the underlying predicate crime with advance knowledge that a confederate would use or carry a firearm. Because the jury instructions did not require the jury to find such advance knowledge, the conviction was vacated and the case remanded.
The Court, in an opinion by Justice Kagan, began with the basic principle of aiding-and-abetting liability under § 2: an aider and abettor must intend to facilitate the commission of the charged offense, not merely some lesser-included or related conduct. Applying that principle to § 924(c), the Court explained that the presence and involvement of a firearm transforms the underlying offense into a distinct aggravated crime—"a drug deal becomes an armed drug deal"—and therefore the government must prove that the accomplice intended to facilitate the entire crime including its firearm component. Intent, in turn, is shown by knowledge coupled with continued participation. It is not necessary that the accomplice desire the gun use as an end in itself; rather, if he learns in advance that a firearm will be used or carried and continues to participate, a jury may infer the requisite intent to further an armed offense. Critically, the Court clarified the timing component of knowledge. The defendant must have advance knowledge of the firearm—meaning awareness at a point when he can withdraw from the enterprise. If the accomplice only learns of the gun at the moment it appears or fires, and has no realistic opportunity to quit the crime, the knowledge is too late to support the inference that he intended to facilitate an armed offense. The trial court's instruction, which allowed conviction based merely on participation in the drug deal plus the confederate's gun use, without ensuring the jury found timely knowledge, misstated the law. The Court rejected the government's suggestion that it suffices for an accomplice to learn of the gun at any time during the crime, emphasizing that aiding-and-abetting liability requires a voluntary alignment with the criminal venture as charged. It also rejected Rosemond's argument that the government had to prove he specifically intended that a firearm be used, reiterating that continued participation after gaining advance knowledge allows the jury to find the necessary intent. The Court vacated and remanded for the lower court to determine whether the instructional error was harmless in light of the evidence. Separate opinions agreed in part and disagreed in part on the scope of intent and the interaction with sentencing enhancements, but did not alter the core advance-knowledge rule announced by the majority.
Rosemond is a leading case on accomplice liability and mens rea for compound federal crimes. It firmly establishes that for § 924(c) aiding-and-abetting liability, the government must prove not just participation in the predicate crime, but also timely knowledge of the firearm sufficient to allow withdrawal. The decision shapes federal jury instructions, charging decisions, and plea negotiations in gun-related drug and violence prosecutions. For law students, it illustrates how courts import general principles of accomplice liability into specific statutory frameworks, how timing of knowledge affects intent, and how the Court calibrates criminal culpability when aggravating elements (like a gun) transform the offense.
Rosemond clarifies that aiding-and-abetting liability under federal law requires more than mere presence at a crime scene or after-the-fact awareness of a confederate's conduct. For § 924(c) prosecutions, the government must establish that the accomplice knowingly aligned himself with an armed criminal venture by acquiring advance knowledge of the firearm and choosing to continue his participation.