Letting your Pennsylvania medical marijuana card expire does not, on its own, restore your right to own or buy a gun. Federal law bars anyone who counts as an “unlawful user” of a controlled substance from possessing firearms or ammunition, and marijuana is still a Schedule I substance under federal law no matter what Pennsylvania’s medical program says.1Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Identify Prohibited Persons So the question of whether you can own a gun after your medical card expires in PA turns on when you actually stopped using marijuana, not on the date printed on the card.
The Card Expiring Is Not the Event That Matters
The Gun Control Act makes it a federal crime for any “unlawful user of or addicted to any controlled substance” to possess a firearm or ammunition.1Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Identify Prohibited Persons Marijuana sits on Schedule I alongside heroin and LSD, and no federal exception exists for state-legal medical use.2Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances Pennsylvania’s Medical Marijuana Act, signed in 2016, built a legal program under state law, but it changed nothing about your status under the federal Gun Control Act.
While your card was active, federal law treated you as a prohibited person. The card itself created an inference that you were a current user. Once the card lapses, that specific inference goes away, but the underlying question stays the same: are you still using marijuana? If the answer is yes, you remain prohibited whether or not the card is valid. If the answer is genuinely no, the analysis moves to the ATF’s revised definition of what counts as a “current” user.
What the ATF’s 2026 Rule Changed
On January 22, 2026, an ATF interim final rule revising the definition of “unlawful user of or addicted to any controlled substance” took effect. This is the most significant development for former medical marijuana cardholders in years.3Federal Register. Revising Definition of Unlawful User of or Addicted to Controlled Substance
The revised rule clarifies two things that matter directly to former cardholders:
- To be an “unlawful user,” a person must use a controlled substance “with sufficient regularity and recency to indicate that the individual is actively engaged in such conduct.” Past use alone is not enough.
- A person is not considered an unlawful user if they have “ceased regularly unlawfully using the substance,” or if their use was “isolated or sporadic” and does not show a pattern of ongoing use.
Here is the frustrating part. The rule sets no specific number of days, months, or years. There is no bright-line “90 days after your last use and you’re clear.” The ATF removed some of the old inference language that treated a single failed drug test or a single conviction within the past year as automatic proof of current use, but the replacement standard is a judgment call about regularity and recency.
The practical effect for a Pennsylvania resident whose card has expired and who has genuinely stopped using marijuana: your legal position is stronger than it was before January 2026, but “stronger” is not “guaranteed.” The longer the gap between your last use and any firearm purchase or possession, the more clearly you fall outside the definition.
Pennsylvania Layers Its Own Prohibition on Top
Pennsylvania’s Uniform Firearms Act governs who can possess, buy, and carry firearms in the state.4Pennsylvania General Assembly. Pennsylvania Code Title 18 Chapter 61 – Firearms and Other Dangerous Articles Under 18 Pa.C.S. § 6105, a person prohibited from possessing firearms under federal law is also prohibited under state law. The federal marijuana prohibition flows straight into Pennsylvania’s statute. As long as you qualify as an unlawful user under the federal standard, Pennsylvania treats you as a prohibited person too, and a violation of § 6105 is a felony.
Every firearm purchase from a licensed dealer in Pennsylvania runs through the Pennsylvania Instant Check System (PICS), which checks state and federal databases to determine eligibility.5Commonwealth of Pennsylvania. Firearms Records Private handgun sales must also go through a licensed dealer or county sheriff’s office for a background check. Private transfers of long guns do not require one, but federal and state prohibitions still apply to the buyer regardless of the transfer method.
The License to Carry Piece
If you held a Pennsylvania License to Carry Firearms (LTCF) before getting your medical marijuana card, your county sheriff likely revoked it or denied a renewal. Under 18 Pa.C.S. § 6109, sheriffs must deny an LTCF to any individual “prohibited from possessing or acquiring a firearm under the statutes of the United States.”6Pennsylvania State Police. Carrying Firearms in Pennsylvania Delaware County’s sheriff’s office, for one, explicitly tells medical marijuana cardholders that holding a card makes it “unlawful for you to apply for, possess or renew a Pennsylvania License to Carry Firearm.”7Delaware County, Pennsylvania. Firearm Licenses
After your card expires and you have stopped using, you would need to apply or reapply for the LTCF through your county sheriff. The sheriff also has discretion to deny the license based on “character and reputation,” so a recent history of medical marijuana use could factor into that assessment even after the federal prohibition no longer clearly applies to you.
Form 4473 and the “No” You’ll Be Asked to Give
When you buy a firearm from a licensed dealer, you fill out ATF Form 4473. Question 21(f) asks: “Are you an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance?” A bolded warning follows: “The use or possession of marijuana remains unlawful under Federal law regardless of whether it has been legalized or decriminalized for medicinal or recreational purposes in the state where you reside.”8Bureau of Alcohol, Tobacco, Firearms and Explosives. Firearms Transaction Record – ATF Form 4473 (5300.9)
If you have genuinely stopped using marijuana and enough time has passed that a reasonable person would not consider you a current user under the 2026 definition, answering “no” is legally defensible. If you are still using, or stopped only recently, answering “no” is a false statement on a federal form. Lying on Form 4473 is a federal crime under 18 U.S.C. § 922(a)(6).9Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
The card expiration date and your last date of use are often different dates, and it is the use that matters. This is where former cardholders get into trouble: treating the expiration date as the finish line rather than as one factor in a longer analysis.
What You’re Risking If You Get It Wrong
The penalties break into two separate offenses, and it helps to keep them straight.
Possessing a firearm while still qualifying as an unlawful user of marijuana is a violation of 18 U.S.C. § 922(g)(3). The penalty is up to 15 years in federal prison, raised from 10 years by the Bipartisan Safer Communities Act of 2022.10Office of the Law Revision Counsel. 18 US Code 924 – Penalties Prosecutions of medical marijuana users for simple firearm possession are rare, but the exposure is real. Note that “possession” covers guns already in your safe, not just new purchases.
Making a false statement on Form 4473 to acquire a firearm is a separate offense under § 922(a)(6), carrying up to 10 years in federal prison.9Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts This one applies even if you never actually receive the gun. Answering “no” to question 21(f) while still an active user is a federal crime whether or not the sale goes through.
Pennsylvania can charge the possession offense too, as a felony under § 6105, which means the same conduct can produce both state and federal cases.
Practical Steps After Your Card Expires
No official number of days will guarantee you are in the clear, but a few steps meaningfully reduce your legal risk:
- Stop using marijuana completely. The card’s expiration date is not the starting point for anything. The date of your last use is.
- Wait a meaningful period before buying or retrieving firearms. The 2026 rule turns on regularity and recency, so the longer the gap, the stronger your position. Some attorneys advise waiting at least a year, though that is not an official standard.
- Do not renew the card. An active card creates an inference of current use under federal regulations even if you have not used marijuana recently. Letting it lapse without renewal removes that inference.
- Consult a firearms attorney familiar with Pennsylvania law before your first purchase or before retrieving stored firearms. How long you held the card, how frequently you used, and any related criminal history all affect your specific risk.
One point worth flagging on your own guns. If you surrendered or stored firearms when you got your card, the same analysis applies before you take them back. Possession is the word in the federal statute, not purchase. A gun in your safe is treated the same as a new one from a dealer for prohibited-person purposes, so the same cessation and waiting period should come first.