Carrying a gun into a cannabis dispensary is illegal under federal law before any state rule or store policy enters the picture. Anyone who uses cannabis is a prohibited person under 18 U.S.C. § 922(g)(3), so possessing a firearm at all — much less bringing one into a dispensary — violates federal law, regardless of a medical card, a concealed carry permit, or state legalization.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts A Supreme Court challenge to that ban is pending as of 2026, but until the Court rules, the prohibition applies nationwide.
Why Federal Law Blocks It Before You Walk In
Cannabis is still a Schedule I controlled substance under federal law, even though more than 40 states have legalized it in some form.2Drug Enforcement Administration. Drug Scheduling Section 922(g)(3) prohibits any “unlawful user of or addicted to any controlled substance” from shipping, transporting, receiving, or possessing a firearm or ammunition.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts That language sweeps in every cannabis consumer in the country, including state-registered medical patients.
You don’t have to be high while carrying the gun. You don’t have to bring it into the dispensary specifically. Federal courts have generally read “unlawful user” to mean someone who uses a controlled substance with enough regularity to be an ongoing user, not someone who tried it years ago. If you use cannabis with any regularity and own a firearm, the statute already applies to you. Walking into a dispensary with that firearm doesn’t create the violation — it just makes it visible.
The Form 4473 Trap
Every firearm purchase through a licensed dealer requires ATF Form 4473. Question 21(e) asks directly whether the buyer is “an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug or any other controlled substance.” The form warns that cannabis use “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.”3Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Form 4473 – Firearms Transaction Record
There is no good answer for a cannabis user. Answer honestly and the dealer denies the sale. Lie and you have committed a separate federal felony under 18 U.S.C. § 922(a)(6). The form itself warns that certain Gun Control Act violations carry up to 15 years in prison and fines up to $250,000.3Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF Form 4473 – Firearms Transaction Record
Medical Cards, Concealed Carry, and the State-Federal Mismatch
State medical marijuana registries are generally not shared with or accessible through the FBI’s National Instant Criminal Background Check System, and no federal mechanism automatically cross-references the two. That absence of a data link does not make the purchase legal. If you answer Form 4473 truthfully, the sale is denied whether or not your card ever appeared in a database.
The interaction between a concealed carry permit and a medical card varies by state. Most states do not automatically revoke one when you get the other, which creates a gray zone: your state may treat both permits as valid while federal law treats the combination as a crime. Carrying under a valid state permit while also using cannabis still violates § 922(g)(3).1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts State permission does not override the federal prohibition.
State Rules on Firearms Inside Dispensaries
Layered on top of the federal ban, states restrict where firearms can be carried by designating certain locations as “sensitive places.” The Supreme Court affirmed in New York State Rifle & Pistol Association, Inc. v. Bruen (2022) that states retain authority to restrict firearms in sensitive places, while cautioning that the category cannot be stretched to every public gathering spot.4Supreme Court of the United States. New York State Rifle and Pistol Association Inc v Bruen
Whether dispensaries qualify is unsettled in most states. Some have enacted laws that explicitly prohibit firearms inside licensed dispensaries. Others have no specific provision, which leaves dispensaries in the same legal category as any other retail store. States also differ on open carry, concealed carry, and permitless carry. Because the variation is wide, anyone considering carrying near a dispensary needs to check the specific state and local rules rather than assume. None of those state permissions cure the federal problem.
Dispensary Policies and the Trespass Risk
Even where state law does not ban firearms in dispensaries, the businesses themselves almost always do. As private property, they can prohibit guns on the premises, and many post “no firearms” signs and screen for weapons at the door. This reflects both the cash-intensive nature of the industry and regulatory expectations tied to state licensing.
Ignoring a posted policy carries consequences beyond being asked to leave. Refusing to leave after being told firearms are not permitted can support a criminal trespass charge. Depending on the state, a first-offense trespass conviction can result in fines ranging from roughly $75 to several thousand dollars, and in some jurisdictions it is a misdemeanor that goes on your criminal record. That charge is separate from any federal violation, so both exposures can stack.
What the Supreme Court and Rescheduling Could Change
The federal ban is facing its most serious legal challenge yet. The U.S. Court of Appeals for the Fifth Circuit ruled that § 922(g)(3) is unconstitutional when used to prosecute a regular drug user who was not shown to be under the influence while possessing the firearm. Based on that ruling, a federal district judge dismissed charges against a Texas man after agents found a pistol and marijuana in his home.5SCOTUSblog. Supreme Court Skeptical of Law Banning Drug Users From Possessing Firearms
The federal government appealed, and the Supreme Court heard oral arguments in March 2026. A majority appeared skeptical that the indictment could stand, and a decision is expected by summer 2026.5SCOTUSblog. Supreme Court Skeptical of Law Banning Drug Users From Possessing Firearms Until then, § 922(g)(3) remains enforceable in every federal circuit except the Fifth.
Rescheduling is the other moving piece. In December 2025, President Trump signed an executive order directing the Attorney General to move cannabis from Schedule I to Schedule III “in the most expeditious manner.” As of early 2026, the DEA has said the administrative process is still underway and no schedule change has taken legal effect. Even if the move is finalized, the gun ban likely stays. Section 922(g)(3) applies to unlawful users of any controlled substance, not just Schedule I drugs, and Schedule III substances are still controlled substances.1Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts A Congressional Research Service analysis concluded that most collateral consequences of marijuana use, including the inability to purchase and possess firearms, “would remain the same if it is moved to Schedule III.”6Library of Congress. Rescheduling Marijuana – Implications for Criminal and Collateral Consequences The Department of Justice has told the Supreme Court that the ban should be upheld even if rescheduling is finalized. Only full descheduling or an act of Congress would clearly resolve the conflict.
For now, the two layers of law contradict each other. Your state may let you carry a firearm and buy cannabis. Federal law says doing both makes you a prohibited person who cannot legally possess a gun at all, and bringing one into a dispensary compounds the problem with likely policy and possible state violations on top.