Marijuana and Firearms in Massachusetts:
The Federal-State Conflict

I use marijuana legally under Massachusetts law. Can I still own firearms?

Massachusetts approved recreational marijuana for adults 21 and older through a 2016 ballot initiative (Question 4), now codified at MGL c.94G. Adults 21 and older may lawfully possess up to one ounce of marijuana in public and up to five ounces at their residences. Despite full state legalization, federal law creates an absolute conflict for firearms owners.

The Federal Prohibition

18 U.S.C. Section 922(g)(3) ^[2] prohibits any person who is an "unlawful user of or addicted to any controlled substance" from possessing firearms or ammunition. Marijuana remains Schedule I under 21 U.S.C. Section 812 ^[3], regardless of state legalization. The base penalty is up to 15 years imprisonment under 18 U.S.C. Section 924(a)(8), as amended by the Bipartisan Safer Communities Act (2022).

ATF Form 4473, Question 21.e, asks firearms buyers directly whether they are unlawful users of, or addicted to, marijuana or any controlled substance. A bold warning states that marijuana use "remains unlawful under Federal law regardless of whether it has been legalized or decriminalized" in the buyer's state. Answering falsely is a separate federal felony under 18 U.S.C. Section 922(a)(6), carrying up to 10 years imprisonment.

ATF Guidance and the January 2026 Interim Final Rule

ATF's September 2011 Open Letter to all FFLs remains operative: possession of a state-issued medical marijuana card gives a dealer "reasonable cause to believe" the person is an unlawful user, and the dealer may not complete the transfer. In Massachusetts, the medical-use of marijuana program issues registration cards to qualifying patients. A state-issued cannabis registration could, under the ATF interpretation, create a documented trail that a dealer might treat as reasonable cause to believe a person is an unlawful user.

On January 22, 2026, ATF published an Interim Final Rule revising the regulatory definition of "unlawful user of or addicted to any controlled substance" in 27 C.F.R. Section 478.11 ^[4]. The IFR narrowed "unlawful user" to a person who regularly uses a controlled substance over an extended period continuing into the present, without a lawful prescription or in a manner substantially different from prescribed. ATF described this as an interim measure pending the Supreme Court's decision in United States v. Hemani.

On April 29, 2026, ATF issued a final rule package that narrowed the standard further. Under the April 29 rule, a person qualifies as an unlawful user only if they meet at least one of three criteria at the time of possession: (1) active impairment by a controlled substance; (2) a conviction for a controlled-substance offense within the preceding 12 months; or (3) clinical evidence of dependence on a controlled substance within the preceding 12 months. The prior "any positive test" standard is eliminated. ATF described the April 29 rule as implementing the narrowed framework consistent with the constitutional avoidance reasoning signaled by the Court's questioning in Hemani. This is a federal-only change; state marijuana laws and state firearms licensing are not affected.

The Circuit Courts, Hemani, and the March 2026 Oral Arguments

The Ninth Circuit upheld Section 922(g)(3) in Wilson v. Lynch, 835 F.3d 1083 (9th Cir. 2016), but that decision predates the NYSRPA v. Bruen (2022) framework. The Fifth Circuit held Section 922(g)(3) unconstitutional as applied to a marijuana user in United States v. Daniels, 77 F.4th 337 (5th Cir. 2023). No First Circuit decision has directly addressed Section 922(g)(3) as applied to marijuana users under the Bruen historical tradition framework.

The Supreme Court granted certiorari in United States v. Hemani (Docket 24-1234). On March 2, 2026, the Court heard oral arguments ^[6]. During arguments, multiple justices appeared skeptical of the government's position defending the constitutionality of Section 922(g)(3) as applied to marijuana users. The questioning focused on the difficulty of defining "habitual user," the distinction between unlawful behavior and dangerous behavior, and whether the historical laws cited by the government were sufficiently analogous under Bruen ^[7]. Legal commentators noted that a narrow ruling -- rather than a complete overturning of Section 922(g)(3) -- appears most likely. A decision is expected by late June 2026.

Massachusetts State Law

Under MGL c.94G, marijuana use alone does not disqualify a Massachusetts resident from possessing firearms or obtaining an LTC or FID card under state law. Massachusetts has not enacted any "cannabis consumer protection" statute shielding firearms purchasers from scrutiny based on marijuana use.

However, the LTC suitability determination under MGL c.140 §131 grants local licensing authorities discretion to deny an LTC if the applicant is deemed "unsuitable." Some licensing authorities have treated regular marijuana use as a suitability factor, though no published Massachusetts appellate decision has established that marijuana use alone justifies denial under the post-Bruen framework. After Chapter 135, FID card applicants are subject to an unsuitability determination under MGL c.140 §129B(a) and the §121F standard, in addition to the prohibited-person disqualifiers. DCJIS does not cross-reference the medical marijuana patient registry with firearms records.

Bottom Line

Settled: Current marijuana users are federally prohibited persons under Section 922(g)(3) regardless of Massachusetts legalization. Lying on Form 4473 is a separate federal felony.

Unsettled: Whether Section 922(g)(3) survives Second Amendment scrutiny under Bruen. Whether a Massachusetts licensing authority may treat marijuana use as a suitability factor under the MGL c.140 §131 suitability standard. Whether the ATF's revised "unlawful user" definition will take final effect.

Watch: The Supreme Court's decision in Hemani (expected June 2026) could reshape this conflict nationwide. If the Court narrows or invalidates Section 922(g)(3) as applied to marijuana users, the ATF's Interim Final Rule, Form 4473 warnings, and the entire federal enforcement framework would require revision.