Marijuana Use and Firearm Possession Under Federal Law

Under federal law, you cannot legally own or buy a gun if you regularly use marijuana, even in a state where marijuana is fully legal. The Gun Control Act, at 18 U.S.C. § 922(g)(3), makes it a felony for any “unlawful user of or addicted to” a controlled substance to possess a firearm or ammunition, with a maximum sentence of 15 years in federal prison.¹ Marijuana is still a Schedule I controlled substance federally, and there is no medical exception, no recreational carve-out, and no quantity threshold that makes marijuana use compatible with gun ownership under current federal law.²

The prohibition covers ammunition on its own. You do not need to own a gun to violate the law; a box of cartridges in the closet is enough if you are a regular user.¹ Handguns, rifles, shotguns, and antique reproductions that fire modern ammunition are all covered.

Who Counts as an “Unlawful User”

In January 2026, the ATF published an interim final rule rewriting the regulatory definition. An “unlawful user” is now someone who regularly uses a controlled substance over an extended period of time continuing into the present, without a lawful prescription or in a manner substantially different from what a physician prescribed.³ The rule dropped the earlier single-incident triggers, so one failed drug test, one arrest, or one conviction in the past year no longer automatically qualifies. The government now needs evidence of regular use with enough frequency and recency to show you are actively engaged in that conduct.

Two things follow that matter for anyone weighing their own situation. You do not have to be high when you touch a gun. A pattern of recent, regular use is enough, even if you were sober the day of the purchase or the day police showed up. On the other side, isolated or sporadic use no longer qualifies on its own. Someone who tried marijuana once at a party six months ago, with no ongoing pattern, would not be treated as a prohibited user under the 2026 rule.³

The statute also reaches anyone “addicted to” a controlled substance. The 2026 rule defines that as a person who uses a controlled substance and shows a pattern of compulsive use with impaired control.³ That is a separate ground, so a person could be disqualified even where the underlying use is prescribed, if the pattern reflects compulsive behavior beyond what the doctor directed.

Medical Marijuana Cardholders

Holding a state-issued medical marijuana card is one of the riskiest situations. A card is strong evidence of regular, ongoing use, because it signals you applied for legal access to a substance you intend to use on a continuing basis. Federal authorities and background-check systems treat active cardholders as presumptively prohibited, and the 2026 rule carves out no exception for state-authorized patients.³

Buying from a Dealer: Form 4473

Every purchase from a licensed dealer requires ATF Form 4473, signed under penalty of perjury. Question 21.f asks directly whether you are an unlawful user of, or addicted to, marijuana or any other controlled substance, with a bold warning that marijuana use remains unlawful federally regardless of state law.⁴

Answering “no” while you are a regular user is a separate federal crime under 18 U.S.C. § 922(a)(6), which prohibits knowingly making a false statement in connection with a firearm purchase.¹ A marijuana user who buys from a dealer is exposed to two felonies at once: the false statement and the possession.

Private Sales, Gifts, and Inherited Guns

Buying privately does not solve the problem. A separate provision makes it illegal for any person to sell or transfer a firearm to someone they know or have reasonable cause to believe is an unlawful user.¹ That reaches neighbors, hunting partners, and relatives. If they know you use and sell to you anyway, both of you are exposed.

The possession ban applies regardless of how the gun got to you. Inheriting a firearm, receiving one as a gift, or already owning guns before you started using marijuana does not change the analysis. Keeping those firearms while you use is a federal violation.

Living in a Household with Guns

Households where one person uses marijuana and another owns firearms are a particular trap. Federal prosecutors have argued that a marijuana user living in a home with accessible firearms can be charged with constructive possession, even when the guns belong to someone else and are stored in a safe. The theory: regular use plus access equals possession under § 922(g)(3). Prosecutors do not have to show you carried the gun at the moment you used marijuana. A firearm locked in a bedroom safe while marijuana is used elsewhere in the house has been treated as enough.

The safer arrangement is to make sure the marijuana user genuinely cannot access the firearms. That means storage in a container or room only the non-using household member can open, with the user having no combination and no key.

State Legalization Doesn’t Change the Federal Rule

A majority of states have legalized marijuana for medical use, recreational use, or both. None of that alters the federal analysis. The Supremacy Clause gives federal law precedence where it conflicts with state law, and federal courts have consistently held that state legalization creates no exception to the Gun Control Act.

You can legally buy marijuana at a licensed dispensary in your state, walk next door to a gun store, and commit a federal felony trying to buy a rifle. Prosecutions most often arise when marijuana use surfaces during an investigation into something else, but the legal exposure is there for anyone in this situation.

Penalties

Illegal possession by an unlawful user: up to 15 years in federal prison under 18 U.S.C. § 924(a)(8). The Bipartisan Safer Communities Act of 2022 raised this ceiling from 10 years.⁵
False statement on Form 4473: up to 10 years.⁵
Stacked charges: a person who lies on the form and then takes the gun can face both, with a combined statutory maximum of 25 years.
Permanent firearm disability: a federal felony conviction strips your gun rights for life, so the original offense bars ownership permanently.

Both offenses also carry substantial fines. Federal sentences typically include supervised release after prison, and violations during that period can send you back inside.

Getting Your Firearm Rights Back After You Stop Using

The prohibition is not permanent in theory. The 2026 rule explicitly says a person is not an unlawful user if they have “ceased regularly unlawfully using the substance.”³ The rule does not set a fixed waiting period, so it is a judgment call based on the whole picture.

If you hold a medical marijuana card, stopping use is unlikely to be enough on its own. The card itself is evidence of ongoing access and can be flagged by background-check systems. The practical steps start with formally surrendering or revoking the card through your state’s process rather than letting it lapse passively. After that, letting a meaningful period of non-use pass before trying to buy reduces the risk of a denial or prosecution. Some state police agencies have said federal restrictions remain in effect for at least one year after a medical card is relinquished.

There is no federal form for a clearance letter. The determination happens case by case, and the burden is on you to be sure you no longer meet the definition before you buy or possess.

What Might Change: Harris and Rescheduling

The constitutional foundation of § 922(g)(3) is under active challenge. In September 2025, a cert petition was filed in Harris v. United States asking the Supreme Court whether the ban violates the Second Amendment as applied to someone who occasionally uses marijuana but was not intoxicated at the time of possession.⁶ Several lower federal courts have already found the statute unconstitutional as applied to marijuana users, creating a circuit split that makes review more likely. As of mid-2026, the Court has not said whether it will take the case. Until it rules, the statute is fully enforceable everywhere, and betting on a constitutional defense to criminal charges is a high-risk gamble.

On rescheduling, the Department of Justice and the DEA in 2026 immediately placed FDA-approved marijuana products and state-regulated medical marijuana products into Schedule III, and an administrative hearing on moving all marijuana to Schedule III is set to begin on June 29, 2026.⁷ Even full rescheduling would not automatically restore firearm rights for marijuana users. The federal firearm ban reaches unlawful users of any controlled substance, not just Schedule I. If marijuana moves to Schedule III, using it without a valid prescription would still be federally unlawful, and possessing a firearm while doing so would still violate § 922(g)(3). What would change is the picture for patients with legitimate prescriptions, because prescribed use of a Schedule III substance is lawful. The Trump administration’s Solicitor General has told the Supreme Court that rescheduling “does not affect the proper resolution” of the constitutional question in Harris.

Rescheduling is not legalization. Until Congress removes marijuana from the controlled substances schedules or amends § 922(g)(3) to exclude it, the conflict between marijuana use and gun ownership will persist in some form for recreational users.

1
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
2
Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances
3
Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
4
Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Form 4473 – Firearms Transaction Record
5
Office of the Law Revision Counsel. 18 USC 924 – Penalties
6
Supreme Court of the United States. Harris v. United States – Petition for Writ of Certiorari
7
U.S. Department of Justice. Justice Department Places FDA-Approved Marijuana Products and Products Containing Marijuana in Schedule III