Yes, you can buy a gun after your medical marijuana card expires, provided you have actually stopped using cannabis. Federal law targets current unlawful users of controlled substances, not people who once held a state-issued card. A January 2026 rule change from ATF makes that distinction clearer than it used to be, but the details around timing, honesty on the purchase form, and guns you already own still matter.
Federal Law Still Sets the Rule, Even After Your Card Lapses
Marijuana remains a Schedule I controlled substance under federal law. The Department of Justice proposed rescheduling it to Schedule III in May 2024, and a December 2025 executive order directed the Attorney General to finish that process quickly, but as of 2026 the rescheduling is still pending and marijuana’s Schedule I status has not changed.1The White House. Increasing Medical Marijuana and Cannabidiol Research
That classification drives the firearm rule. The Gun Control Act makes it illegal for anyone who is “an unlawful user of or addicted to any controlled substance” to possess, receive, ship, or transport any firearm or ammunition.2Office of the Law Revision Counsel. 18 U.S.C. Chapter 44 – Firearms The card itself has never been the disqualifier. Federal law does not prohibit holding a state-issued MMJ card. It prohibits using a controlled substance while possessing or acquiring firearms. So the real question when your card expires is whether you have actually stopped consuming cannabis.
The 2026 ATF Definition of “Unlawful User”
On January 22, 2026, an ATF interim final rule took effect that rewrote the regulatory definition of “unlawful user” in 27 CFR 478.11.3Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
Under the revised rule, an unlawful user is someone who regularly uses a controlled substance over an extended period of time continuing into the present, without a lawful prescription. The rule explicitly states that a person is not an unlawful user if they have ceased regular use, or if their use was isolated or sporadic and does not show a pattern of ongoing use.3Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
This changed the earlier standard, which included inference examples such as a drug conviction, multiple arrests, or a positive drug test within the past year as evidence of current use. The 2026 rule drops those examples and instead requires evidence of regular and recent use sufficient to show the person is actively engaged in that conduct. For someone whose MMJ card has expired and who has genuinely stopped consuming cannabis, that revised standard works in your favor.
How Long Do You Have To Wait After Quitting
Federal law sets no specific waiting period after you stop using marijuana. There is no mandatory 30-day or 90-day clock built into the statute or the regulation.
The regulation does require that your use not be “continuing into the present.” The closer in time your last use is to a firearm purchase, the harder it becomes to credibly say you have ceased. Federal courts have historically looked for a temporal connection between drug use and firearm possession, and the 2026 rule codifies the idea that recency matters even without setting a bright-line date. Using yesterday and trying to buy a gun tomorrow will not work, waiting period or no.
There is no federal checklist for proving you stopped, either. The rule frames the question in terms of what the government must show to establish you are a current user: regular use over an extended period continuing into the present. By implication, the absence of recent, regular use is what puts you in the clear. Time elapsed since your last use, the expiration of your card with no renewal, and the absence of any drug-related arrests or positive tests all cut in your direction. No single factor is decisive. A longer gap between your last use and any purchase strengthens your position considerably. Months of abstinence are far more defensible than days.
Form 4473 and Answering Honestly
Every firearm purchase from a federally licensed dealer requires ATF Form 4473, a sworn statement used to screen for federal disqualifiers. One question asks whether you are an unlawful user of, or addicted to, marijuana or any other controlled substance. The form includes a warning that marijuana use remains unlawful under federal law regardless of state legalization.4Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Licensee Quick Reference and Best Practices Guide
Answer “yes” and the dealer must stop the transaction.4Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Licensee Quick Reference and Best Practices Guide If your card has expired and you have genuinely stopped using marijuana, you can truthfully answer “no.” The burden falls entirely on you. The form is a sworn statement, and your answer needs to be honest at the moment you sign it. If you have any real doubt about whether you still count as a current user, wait longer rather than sign.
Renewing or Reapplying Undermines Cessation
Holding an MMJ card is not itself a federal disqualifier. It is, however, strong circumstantial evidence of current use. Renewing an expired card or obtaining a new one shortly before a firearm purchase makes it much harder to credibly claim you have ceased.
Guns You Already Own and Ammunition
People often focus on Form 4473 and assume the risk disappears if they buy privately or already own guns. It does not. The federal statute bars unlawful users of controlled substances from possessing any firearm or ammunition, regardless of how or when the firearm was acquired.5Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts A private sale with no background check, a gift from a relative, or a hunting rifle you have owned for a decade all fall under the same prohibition if you are a current unlawful user.
The ammunition detail catches people off guard. Federal law treats ammunition identically to firearms for this purpose. An active marijuana user who buys a box of shotgun shells at a sporting goods store is technically committing a federal offense, even without touching a gun.5Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts Once your card has expired and you have stopped using, that possession bar lifts along with the purchase bar, because both hinge on the same “current user” status.
Will a Background Check Catch a Former MMJ Card
The National Instant Criminal Background Check System, run by the FBI, is what dealers use to screen buyers. NICS searches criminal records, protection orders, and other federal and state databases for disqualifying information.6Federal Bureau of Investigation. Firearms Checks (NICS) It does not have access to state medical marijuana patient registries. Those registries are protected by state health privacy laws and are not shared with federal law enforcement databases.
NICS will not flag you simply because you once held an MMJ card. The system relies on your self-disclosure on Form 4473. That does not make lying safe. It means the system is built around your honesty on the form, and the consequences of dishonesty are severe.
Penalties for a False Answer
Making a false statement on Form 4473 to acquire a firearm is a federal felony. The maximum penalty is 10 years in federal prison.7Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Prosecutors Aggressively Pursuing Those Who Lie in Connection With Firearm Transactions Federal prosecutors have made these cases a priority. ATF and the Department of Justice have publicly targeted what they call “lie-and-try” purchases, where someone knowingly misrepresents their eligibility to get through the background check.8United States Department of Justice. U.S. Attorney and ATF Target Those Who Lie-And-Try to Purchase Firearms
A felony conviction for this offense would also permanently strip your firearm rights going forward, producing exactly the kind of long-term disqualification a truthful answer would have avoided.
Two Things That Could Change the Picture
The constitutionality of banning marijuana users from possessing firearms is actively being litigated. The U.S. Court of Appeals for the Fifth Circuit ruled in United States v. Daniels that the federal ban could not constitutionally be applied to someone based solely on prior, occasional, or habitual marijuana use, finding no historical tradition of disarming ordinary citizens for intoxication habits.9United States Court of Appeals for the Fifth Circuit. United States v. Daniels That case reached its final resolution in January 2025 after a remand from the Supreme Court. The Daniels ruling applies only within the Fifth Circuit, and other federal circuits may reach different conclusions.
Rescheduling to Schedule III would also shift things. Schedule III substances can be legally prescribed, which means patients with valid prescriptions would no longer be “unlawful” users. State medical marijuana programs currently operate through recommendations rather than prescriptions in the traditional federal sense, and whether a state MMJ recommendation would qualify as a lawful prescription under the ATF’s revised definition is an unresolved question. Recreational users without a prescription would still be unlawful users of a controlled substance for firearm purposes even after rescheduling. As of mid-2026, marijuana remains Schedule I, so both of these developments are potential shifts, not current law outside the Fifth Circuit.