Marijuana and Firearms in Massachusetts:
The Federal-State Conflict

Massachusetts and federal law answer different parts of the marijuana-and-firearms question. Massachusetts permits adults age 21 or older to possess up to 2 ounces of marijuana in public and up to 10 ounces at their primary residence.^[1] That state authorization does not by itself determine whether a person may receive or possess a firearm under federal law.

The Federal Rule

18 U.S.C. Section 922(g)(3) prohibits firearm receipt or possession by a person who is an unlawful user of or addicted to a controlled substance.^[2] ATF's January 22, 2026 interim final rule defines an unlawful user as someone who regularly uses a controlled substance over an extended period continuing into the present. The rule says isolated, sporadic, or ceased unlawful use is not enough.^[3]

2026 Scheduling Developments

An April 2026 federal action placed certain FDA-approved marijuana products and products supplied under qualifying state medical-marijuana licenses in Schedule III.^[7] That product-specific action did not make recreational marijuana generally lawful under federal law. The broader proposal to move marijuana from Schedule I to Schedule III remained a separate administrative proceeding.^[8] Neither development, by itself, resolves every application of 18 U.S.C. Section 922(g)(3).

What United States v. Hemani Changed

On June 18, 2026, the Supreme Court held that the government could not constitutionally apply the unlawful-user provision to Ali Hemani when its case relied solely on his regular marijuana use and did not allege that his use made him a danger to himself or others.^[4]

The decision is narrow. It did not decide the statute's separate addict provision, possession while presently intoxicated, legislation directed at a particular drug, or a prosecution supported by individualized evidence that drug use made the person dangerous. It also did not erase Section 922(g)(3) from the U.S. Code. Whether the provision can be applied outside the facts of Hemani remains fact-specific.

Purchases From a Dealer

Federal firearms licensees must use the current ATF Form 4473 and follow the federal transfer process.^[5] Hemani is not permission to provide a false answer. A buyer must answer the form truthfully, and an FFL should not invent a new eligibility rule beyond the current form, statute, regulations, and controlling court decisions.

Massachusetts Licensing

Massachusetts Section 121F does not list lawful adult marijuana use, by itself, as a categorical state licensing disqualifier. It does require the State Police to certify that issuance would not violate state or federal law, and it permits an unsuitability denial only on reliable, articulable, and credible information indicating a public-safety risk or danger to the applicant or others.^[6]

Practical Compliance

• Do not treat Massachusetts legalization as a complete answer to federal firearm eligibility.
• Do not treat Hemani as a blanket ruling for every controlled-substance user or every factual situation.
• FFL staff should use the current Form 4473 and escalate a fact-specific uncertainty instead of guessing.
• A person facing a licensing, possession, or transfer decision should obtain advice from a qualified attorney based on the current facts.