Can You Carry a Gun With a Medical Marijuana Card?

Under federal law, you cannot legally carry a gun with a medical marijuana card, even in the 40-plus states that have legalized medical cannabis. Federal firearms law bars any “unlawful user” of a controlled substance from possessing firearms or ammunition, and because marijuana remains federally illegal, using it, medical card or not, puts you in that category.¹ Several federal appeals courts have recently struck down or limited this ban on Second Amendment grounds, and the Supreme Court heard oral arguments on the question in March 2026. Until the Court rules, the federal prohibition is still on the books.

Why Federal Law Says No

Two federal statutes work together to create the conflict. Marijuana is classified as a Schedule I controlled substance under the Controlled Substances Act, with no federal medical exception.² Separately, 18 U.S.C. § 922(g)(3) prohibits anyone who is “an unlawful user of or addicted to any controlled substance” from shipping, transporting, receiving, or possessing firearms or ammunition.¹

The ATF spelled this out in a 2011 open letter to all federal firearms dealers, stating that anyone who uses marijuana is prohibited from possessing firearms or ammunition “regardless of whether his or her State has passed legislation authorizing marijuana use for medicinal purposes.”³ Your state’s authorization has no bearing on federal firearms law.

What Happens When You Try to Buy a Gun

Every purchase from a licensed dealer requires ATF Form 4473. Question 21.f on the current form asks whether you are “an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance.”⁴ If you use medical marijuana, the truthful answer is yes, and the dealer cannot complete the sale.

Lying on the form is a separate federal felony carrying its own prison term.⁵ So a medical marijuana patient faces a bind at the counter: answer honestly and get denied, or lie and risk prosecution.

The ATF’s 2011 guidance goes a step further. If a dealer knows or has reason to believe a buyer holds a state medical marijuana card, the dealer cannot transfer the firearm even if the buyer checks “no” on the drug question. Simply holding the card gives the dealer “reasonable cause to believe” you are an unlawful user.³

Guns You Already Own

The federal prohibition is not limited to new purchases. Section 922(g)(3) bans possessing firearms and ammunition, so guns already sitting in your home become a legal problem the moment you begin using marijuana.¹ The statute does not include an explicit surrender requirement, but keeping firearms while using medical cannabis puts you in ongoing violation. If federal agents investigated, every firearm in the house could be evidence of a felony.

Recent Court Decisions Are Changing the Picture

Since the Supreme Court’s 2022 Bruen decision required gun regulations to align with the historical tradition of firearm regulation, federal appeals courts have started dismantling the marijuana-user ban.

Fifth Circuit: United States v. Daniels

In January 2025, the Fifth Circuit ruled that § 922(g)(3) is unconstitutional as applied to someone convicted solely for habitual or occasional marijuana use. Historical intoxication laws banned carrying weapons while drunk, but none banned gun ownership by regular drinkers. The court held that § 922(g)(3) imposes a “far greater burden” by prohibiting all possession by an “unlawful user” even when the person is completely sober.⁶

The ruling was narrow. The court did not strike the statute down entirely and left open that the ban could survive against someone whose drug use was “so frequent, severe, and impairing as to render him analogous to the dangerously mentally ill.”⁶

Eleventh Circuit: Florida Commissioner of Agriculture v. Attorney General

In August 2025, a unanimous Eleventh Circuit panel ruled that medical marijuana patients have a presumptive Second Amendment right to bear arms. The court rejected the DOJ’s argument that drug users aren’t part of “the people” protected by the Second Amendment, noting the plaintiffs had never been convicted of any crime. Cannabis patients, the court wrote, “simply cannot be labeled ‘dangerous’ without supporting allegations that they acted (or were likely to act) in a dangerous manner.”⁷

Supreme Court: U.S. v. Hemani

The Supreme Court held oral arguments in U.S. v. Hemani on March 2, 2026, directly addressing whether § 922(g)(3) violates the Second Amendment as applied to marijuana users. No decision has been issued. Until the Court rules, the practical answer depends partly on which federal circuit you live in, but the statute remains enforceable nationwide.

The 2026 ATF Rule and Who It Actually Helps

In January 2026, the ATF published an interim final rule narrowing the definition of “unlawful user.” The agency now requires evidence of “regular and recent” use rather than any use within the past twelve months, and it carved out people whose use was “isolated or sporadic” or who have stopped using the substance regularly.⁸

The rule sets no specific number of months of abstinence that clears you. For active medical marijuana patients, the change offers little practical relief, because state-authorized medical use on an ongoing basis is regular and recent by any reasonable reading.

Would Rescheduling Marijuana Fix This?

The federal government has moved toward reclassifying marijuana from Schedule I to Schedule III. That change would not solve the firearms problem. Section 922(g)(3) applies to users of any controlled substance, not just Schedule I substances, and Schedule III still means federally controlled. Users of ketamine and anabolic steroids, both Schedule III, are already covered by the same prohibition.

The Department of Justice argued this point directly to the Supreme Court, contending that the ban must be upheld regardless of rescheduling because marijuana use makes people “uniquely dangerous and deserving of disarmament.”¹ Only full descheduling or a change to § 922(g)(3) itself would end the conflict at the federal level.

Penalties

A knowing violation of § 922(g) carries up to 15 years in federal prison, a fine, or both under 18 U.S.C. § 924(a)(8).⁹ The maximum was raised from 10 years by the Bipartisan Safer Communities Act of 2022. Lying on Form 4473 is a separate felony with additional prison exposure.⁵ Firearms and ammunition involved in a knowing violation are also subject to federal seizure and forfeiture.¹⁰

Caregivers and Former Users

If you are registered as a medical marijuana caregiver but don’t personally use cannabis, the federal ban likely doesn’t apply to you. The statute targets unlawful users and addicts, and holding a caregiver card alone doesn’t make you either.¹ Practically, the ATF’s 2011 guidance instructed dealers to treat any marijuana authorization card as reasonable cause to deny a sale, so you may still hit obstacles at the counter.³

Former users may eventually fall outside the prohibition. Under the 2026 interim rule, a person who has “ceased regularly unlawfully using the substance” is no longer an unlawful user.⁸ There is no bright-line waiting period. Surrendering your card and stopping use entirely helps, but no official moment guarantees you are clear.

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
Bureau of Alcohol, Tobacco, Firearms and Explosives. Open Letter to All Federal Firearms Licensees
4
Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Form 4473 – Firearms Transaction Record
5
Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Prosecutors Aggressively Pursuing Those Who Lie in Connection With Firearm Transactions
6
United States Court of Appeals for the Fifth Circuit. United States of America v Patrick Darnell Daniels Jr
7
Duke Center for Firearms Law. Litigation Highlight: Guns and Marijuana at the Eleventh Circuit
8
Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
9
Office of the Law Revision Counsel. 18 USC 924 – Penalties
10
eCFR. 27 CFR 478.152 – Seizure and Forfeiture