Cannabis and Gun Ownership in Montana: What the Law Says Today — and What May Change Soon

Under current federal law, cannabis users are prohibited from possessing firearms—even in Montana, where cannabis is fully legal under state law. This restriction comes from 18 U.S.C. § 922(g)(3), which applies to anyone who is an “unlawful user” of a controlled substance. Federal courts have begun questioning whether this prohibition is constitutional, and the U.S. Supreme Court is now actively shaping the future of firearm restrictions. Until federal law changes, the prohibition technically remains in effect, despite Montana’s broad protections for both cannabis use and firearm ownership.

Montana Has Some of the Broadest Firearm Rights in the Country

Montana has one of the strongest gun ownership cultures in the United States. Surveys consistently rank Montana among the top states for firearm ownership, with estimates that a majority of households own at least one firearm. Montana also recognizes constitutional and statutory protections for firearm possession and carry.

The Montana Constitution provides:

“The right of any person to keep and bear arms in defense of his own home, person, and property… shall not be called in question.”
— Mont. Const. art. II, § 12

Montana law also allows permitless concealed carry in most public places. See Mont. Code Ann. § 45-8-316.

In practical terms, Montana law imposes relatively few restrictions on firearm ownership for otherwise law-abiding adults.

But federal law operates independently—and more restrictively.

Federal Law Prohibits Firearm Possession by Cannabis Users

The key federal statute is:

“It shall be unlawful for any person… who is an unlawful user of or addicted to any controlled substance… to possess… any firearm or ammunition.”
— 18 U.S.C. § 922(g)(3)

Marijuana remains a controlled substance under federal law. See 21 U.S.C. § 812(c).

That creates a direct legal conflict:

• Montana law permits cannabis use
• Federal law still classifies marijuana users as “unlawful users”
• Federal firearm restrictions apply regardless of state legalization

This conflict exists because federal law—not state law—controls federal firearm eligibility.

The Immediate Practical Issue: ATF Form 4473

Anyone purchasing a firearm from a licensed dealer must complete ATF Form 4473.

The form asks whether the purchaser is an unlawful user of marijuana or other controlled substances and explicitly states:

“Marijuana remains illegal under Federal law regardless of whether it has been legalized or decriminalized… in the state where you reside.”

Making a false statement on this form is itself a federal crime. See 18 U.S.C. § 922(a)(6).

This creates a serious legal risk. A cannabis user attempting to purchase a firearm from a licensed dealer faces two options:

• Answer truthfully → firearm purchase denied
• Answer falsely → potential federal felony

Neither outcome is ideal.

Concealed Carry Rights Do Not Override Federal Law

Montana allows permitless concealed carry for eligible individuals. Mont. Code Ann. § 45-8-316.

However, state concealed carry rights do not override federal firearm prohibitions.

Federal law applies regardless of whether a person:

• Has a Montana concealed carry permit
• Is legally allowed to carry under Montana law
• Has never been charged with any crime

This is a federal eligibility issue—not a state licensing issue.

Federal Courts Are Now Questioning the Constitutionality of the Ban

The legal landscape began shifting after the Supreme Court’s decision in New York State Rifle & Pistol Ass’n v. Bruen, 597 U.S. 1 (2022).

Bruen held that firearm restrictions must be consistent with the nation’s historical tradition of firearm regulation.

Following Bruen, federal courts have begun striking down or limiting certain firearm prohibitions.

Most notably:

United States v. Daniels, 77 F.4th 337 (5th Cir. 2023)

In Daniels, the Fifth Circuit held that the federal prohibition on firearm possession by marijuana users was unconstitutional as applied to the defendant. The court found insufficient historical precedent for disarming individuals based solely on cannabis use.

This was a significant development.

However, Daniels applies directly only within the Fifth Circuit (Texas, Louisiana, Mississippi). Other federal courts have reached different conclusions, and the issue remains unsettled nationwide.

The Supreme Court Has Already Begun Clarifying the Limits of Firearm Restrictions

In United States v. Rahimi, 602 U.S. 680 (2024), the Supreme Court upheld a different federal firearm prohibition (for persons subject to domestic violence restraining orders), but clarified that firearm restrictions must be grounded in historical tradition and justified by public safety concerns.

Rahimi confirmed that courts must closely examine modern firearm prohibitions under the Second Amendment.

This framework is now being applied to cannabis-related firearm restrictions.

Federal Rescheduling Will Not Automatically Restore Firearm Rights

Even if marijuana is moved from Schedule I to Schedule III, it will still remain a controlled substance. The firearm prohibition applies to unlawful users of controlled substances generally—not just Schedule I substances. See 18 U.S.C. § 922(g)(3).

Rescheduling may strengthen constitutional challenges and influence future litigation, but it does not automatically eliminate the prohibition. Congress or the Supreme Court would need to act more directly to fully resolve the issue.

Why This Legal Conflict Exists

Federal firearm restrictions involving controlled substances were enacted decades before state-level cannabis legalization existed. At the time, lawmakers assumed controlled substance use was uniformly illegal nationwide. 

That assumption is no longer true.

Today, millions of Americans legally use cannabis under state law while remaining technically prohibited from firearm possession under federal law. Courts are now being asked to reconcile this contradiction.

What Montana Cannabis Users and Businesses Should Understand Today

As of now:

• Federal law still prohibits firearm possession by cannabis users
• Montana law does not override federal firearm restrictions
• Concealed carry rights under Montana law do not eliminate federal restrictions
• Federal courts are actively reconsidering the constitutionality of the prohibition
• The Supreme Court has signaled that firearm restrictions must meet strict constitutional scrutiny

This is an evolving area of law, and significant changes may occur within the next few years.

Conclusion: A Legal Landscape in Transition

Montana residents enjoy some of the strongest firearm rights in the country, along with fully legal cannabis under state law.

But federal law has not yet caught up. The federal prohibition on firearm possession by cannabis users remains in effect—for now—but it is under serious constitutional challenge. Future Supreme Court decisions, federal legislation, or broader cannabis reform could resolve the conflict.



Until then, cannabis users should understand that federal firearm law operates independently of Montana law and continues to carry legal consequences.