If you use cannabis and own a firearm, federal law says you are committing a felony. That has been the legal reality for decades, and it remains technically true in March 2026 — even if you live in one of the 24 states where recreational cannabis is fully legal.
But the ground is shifting fast. The Supreme Court just heard oral arguments in a case that could gut the federal prohibition. The ATF recently narrowed its definition of “unlawful user.” And cannabis rescheduling is advancing under a presidential executive order. For the millions of Americans who use cannabis and also own firearms, the next few months could reshape the legal landscape entirely.
Here is where things stand right now.
The Federal Law: 18 U.S.C. Section 922(g)(3)
The statute at the center of this issue is 18 U.S.C. Section 922(g)(3), part of the Gun Control Act of 1968. It makes it a federal crime for any person “who is an unlawful user of or addicted to any controlled substance” to possess, receive, or transport firearms or ammunition. A violation carries up to 10 years in prison.
Because cannabis remains a Schedule I controlled substance, any cannabis user is by definition an “unlawful user” under federal law. It does not matter that your state has legalized it. It does not matter that you have a medical card.
This law applies to possession, not just purchase. If you already own guns and start using cannabis, you are in violation. The statute draws no distinction between a daily smoker and someone who uses an edible once a month.
ATF Form 4473: The Question That Forces a Choice
Anyone purchasing a firearm from a licensed dealer must fill out ATF Form 4473. Question 21.e asks: “Are you an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance?”
The form warns that marijuana remains federally controlled regardless of state law. Answer “yes” and the sale is denied. Answer “no” while actively using cannabis and you have committed a separate federal crime — making a false statement on a firearms form, punishable by up to 10 years. There is no third option.
The question is phrased in the present tense — it asks whether you “are” an unlawful user, not whether you ever were. If you used cannabis in the past but have genuinely stopped, you can truthfully answer “no.” However, there is no bright-line rule for how long you must have been abstinent. Courts have generally looked at recency, frequency, and pattern of use.
The ATF’s New “Unlawful User” Definition
In January 2026, the ATF published an interim final rule narrowing the regulatory definition of “unlawful user.” The updated rule, effective January 22, moves away from the previous approach where even a single recent instance of drug use could theoretically qualify someone as an unlawful user.
Under the new definition, “unlawful user” means someone who regularly uses a controlled substance over an extended period continuing into the present, without a lawful prescription. The rule explicitly excludes drug use that was “remote, infrequent, or sporadic.”
This is a meaningful shift, but it does not legalize anything — cannabis use of any frequency still makes you an unlawful user of a federally controlled substance. The narrowed definition matters more for enforcement discretion and prosecution decisions than for the underlying legality of your conduct. The comment period runs through June 30, 2026.
United States v. Hemani: The Case That Could Change Everything
On March 2, 2026, the Supreme Court heard oral arguments in United States v. Hemani, the most significant Second Amendment case involving cannabis since the Court’s landmark 2022 Bruen decision.
The facts: in 2022, FBI agents searched Ali Hemani’s home in Texas and found a 9mm handgun and 60 grams of marijuana. Hemani told agents he smoked roughly every other day. He was charged under Section 922(g)(3). A federal trial judge threw out the charge. The Fifth Circuit affirmed, holding the statute is unconstitutional as applied to someone who uses drugs regularly but was not shown to be impaired while possessing the firearm. The government appealed.
This case turns on the Bruen framework. The 2022 Bruen decision changed how courts evaluate gun regulations: the government must demonstrate that a restriction is “consistent with this Nation’s historical tradition of firearm regulation,” pointing to Founding Era or Reconstruction Era analogues rather than simply asserting that a group of people is dangerous.
During oral arguments, multiple justices expressed skepticism. Justice Ketanji Brown Jackson noted that under Bruen, courts cannot simply credit modern legislatures’ judgments about who is dangerous. Several justices highlighted the tension between defending the gun ban while the administration simultaneously pushes to reschedule cannabis — signaling it may not be as dangerous as Schedule I implies.
A decision is expected by late June 2026. Most observers expect the justices to rule in Hemani’s favor. A narrow decision could require proof of impairment while possessing the firearm. A broader ruling could strike down Section 922(g)(3) as applied to cannabis users entirely.
What Happens if Cannabis Is Rescheduled to Schedule III
President Trump has ordered the DEA to move cannabis from Schedule I to Schedule III of the Controlled Substances Act. The rulemaking process is underway and could be finalized in 2026.
Here is the critical point many people misunderstand: rescheduling alone would not restore gun rights for most cannabis users. Section 922(g)(3) prohibits firearm possession by unlawful users of “any controlled substance.” It does not distinguish between schedules. Ketamine and Tylenol with codeine are both Schedule III, and using them without a prescription triggers the same prohibition.
Rescheduling would create one exception. If the FDA approves cannabis-based medications, patients with legitimate prescriptions would no longer be “unlawful” users. But for people buying cannabis at state-licensed dispensaries without an FDA prescription — which is virtually everyone today — rescheduling alone changes nothing.
State-Level Variations
Federal law is clear, but enforcement is largely a federal matter, and several states have taken steps to limit the impact on their residents. Illinois has directed the State Police not to revoke Firearm Owner Identification Cards based solely on legal cannabis use. Oklahoma has advanced legislation protecting gun rights for medical marijuana patients. Minnesota has introduced bills preventing medical cannabis enrollment from disqualifying residents from firearm permits.
These protections matter because most gun-related interactions happen at the state level — carry permits, background checks, and encounters with local law enforcement. But no state law can override the federal prohibition. State protections reduce practical risk; they do not eliminate legal risk.
Practical Advice for Cannabis Users Who Own Firearms
None of this is legal advice, and anyone facing a specific legal situation should consult an attorney. That said, here are practical realities worth understanding.
Know your risk profile. Standalone Section 922(g)(3) prosecutions are relatively rare. Most cases arise when cannabis is discovered during an investigation into something else, as in Hemani. That said, “rarely prosecuted” is not the same as “legal.”
Understand what the form asks. Form 4473 asks about current use, not past use. If you have genuinely stopped using cannabis, you can truthfully answer “no.” There is no mandated waiting period, but courts look at recency and pattern of use.
Be cautious about medical marijuana registries. Some states share registry information with law enforcement databases. An active medical marijuana card combined with a firearm purchase creates a documented contradiction that could attract scrutiny.
Do not assume rescheduling solves the problem. Even if cannabis moves to Schedule III, using it without an FDA-approved prescription still triggers the federal firearms prohibition. Do not make legal decisions based on changes that have not yet taken effect.
Watch the Hemani decision. The Supreme Court ruling expected this summer could substantially narrow or eliminate the ban. But until that decision is published, the current law remains in full effect.
What to Watch in the Coming Months
Three developments deserve close attention in the months ahead.
The Hemani decision, expected by late June 2026, will define the constitutional boundaries of Section 922(g)(3). A broad ruling could effectively end the federal prohibition on gun ownership for cannabis users. A narrow ruling could still force significant changes to enforcement.
DEA rescheduling continues to advance. If finalized, it will not directly restore gun rights for most users, but it will reshape the legal framework and could accelerate FDA-approved cannabis products that would be legally prescribed.
The ATF’s interim final rule on the “unlawful user” definition remains open for public comment through June 30, 2026. The final version will determine how the agency interprets and enforces the prohibition going forward.
For now, the law has not changed. Cannabis users who possess firearms remain in violation of federal law. But the legal architecture supporting that prohibition is under more pressure than at any point in its history, and the people most affected by it should be paying close attention.