Few questions generate more confusion at the gun counter than the intersection of marijuana and firearms. With recreational marijuana legal in many states and medical marijuana programs in most others, dealers regularly encounter buyers who are either current users or card holders. The federal law on this topic is unambiguous — even if it's uncomfortable for many dealers and buyers to navigate.

The Federal Position Hasn't Changed

Marijuana remains a Schedule I controlled substance under federal law. The Controlled Substances Act has not been amended to exempt state-legal marijuana use. This means that a person who uses marijuana — even for state-authorized medical purposes, even in a state where recreational use is fully legal — is an "unlawful user of or addicted to any controlled substance" under 18 U.S.C. § 922(g)(3), and is federally prohibited from purchasing or possessing firearms.

The ATF has been explicit about this. The ATF issued an open letter to all FFLs in 2011 clarifying that state-legal medical marijuana use does not change the federal prohibition. That position has not changed despite significant shifts in state marijuana laws since then.

Form 4473 Question 21e

Question 21e on Form 4473 asks: "Are you an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance?" The accompanying instruction note on the current Form 4473 explicitly states that marijuana use is unlawful under federal law regardless of whether it is legal under state or local law. There is no ambiguity in the question's scope.

A medical marijuana cardholder who answers "no" to Question 21e because they believe their state-legal use is lawful is making a false statement on the federal form. That's a federal felony — 18 U.S.C. § 922(a)(6).

Your Liability as a Dealer

Your liability attaches when you know, or have reasonable cause to believe, that a transfer is unlawful. If a buyer presents a medical marijuana card alongside their ID — or if they tell you they're a cardholder while answering "no" to Question 21e — you have reason to believe the transfer may be unlawful. In that scenario, completing the transfer despite that knowledge exposes you to liability. The buyer's false statement doesn't insulate you if you proceeded knowing it was likely false.

What to Do When a Buyer Has a Medical Marijuana Card

If a buyer presents a medical marijuana card as identification, do not use it as the primary identification document — it's not a government-issued photo ID for 4473 purposes. Note its presence. If the buyer then answers "no" to Question 21e, you are aware of a potential inconsistency. You may ask clarifying questions. If you have reasonable cause to believe the buyer is a current marijuana user who answered "no" to 21e, declining the transfer is the legally defensible choice.

Former Users

The prohibition applies to current unlawful users, not former users. Someone who used marijuana in the past but has not used it within the relevant timeframe and is not addicted may legitimately answer "no" to Question 21e. The distinction between current and former use is inherently subjective and difficult to verify at the counter — but it's a legally meaningful distinction.

Potential Changes on the Horizon

There is ongoing federal legislative activity related to marijuana rescheduling and potential changes to federal firearms law. As of 2026, none of these changes have taken effect in a way that modifies the firearms purchase prohibition for marijuana users. Dealers should monitor developments but not act as though changes have occurred until they actually have.

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