This is one of the most-asked questions we see, and it makes sense why: Colorado has a large legal marijuana market, plenty of medical and recreational users also own firearms, and the answer has never come from Colorado law at all. It comes from federal law — and federal law just moved, in a real way, for the first time in decades.
The federal rule, and why Colorado's legality never mattered to it
Federal law, 18 U.S.C. § 922(g)(3), makes it a crime for an "unlawful user of or addicted to any controlled substance" to possess a firearm. Marijuana remains a federally controlled substance regardless of Colorado's recreational and medical framework—state legality does not answer the separate federal question. This resembles the state-and-federal overlap we've discussed with suppressors and NFA compliance: an activity permitted by one jurisdiction may still raise a separate issue under another jurisdiction's rules.
That federal question gets asked directly, in writing, every time you buy from a licensed dealer. ATF Form 4473 — the form every buyer fills out — has long included a question asking whether you are "an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance," with language making clear that federal law controls regardless of state legalization. Answering that question falsely is a separate federal crime on its own, independent of whatever the underlying marijuana use itself would or wouldn't have meant for your eligibility.
What actually changed: United States v. Hemani
On June 18, 2026, the Supreme Court ruled 9–0 in United States v. Hemani, 608 U.S. ___ (2026) — an opinion by Justice Gorsuch, with separate concurrences from Justices Thomas, Jackson (joined by Justice Sotomayor), and Alito (joined by Justice Kagan) concurring in the judgment. The facts: FBI agents searching Hemani's home found a Glock 19, marijuana, and a small amount of cocaine; he told agents he used marijuana roughly every other day and was indicted under § 922(g)(3) for possessing a firearm as a habitual drug user.
The Court held that § 922(g)(3), as applied to Hemani, violated the Second Amendment. The core reasoning: the government can't strip someone of their Second Amendment rights based on drug use alone, without some individualized showing tied to actual dangerousness — contemporaneous impairment, active intoxication while armed, something more than the underlying fact of regular use. Being a marijuana user and a gun owner, standing alone, isn't enough to sustain a federal firearms prosecution anymore.
It's worth being precise about how narrow this actually is, because "the Supreme Court legalized guns for marijuana users" is an overstatement of what the Court did. The ruling is an as-applied decision, not a facial invalidation of § 922(g)(3) — the statute itself remains on the books, and the government can still prosecute cases where it can show something more than bare use, like active impairment while in possession of a firearm, or use so extreme and continuous that a court is willing to treat it the way it would treat genuine incapacity. Several justices wrote separately specifically to flag that the door isn't closed to future prosecutions built on a stronger dangerousness showing.
The regulatory landscape moving alongside it
This isn't happening in isolation. In January 2026, ATF issued an interim final rule narrowing its own definition of "unlawful user" — requiring regular use over an extended period, continuing into the present, with enough regularity and recency to show active, ongoing engagement, rather than any use at any point in someone's life. Then, on May 8, 2026, ATF proposed revised language for Form 4473, changing the current blanket marijuana warning to language that reads: "Federal law does not permit the use or possession of marijuana for recreational purposes" — notably dropping the explicit reference to medical marijuana that's been on the form for years. The public comment period on that proposed form closed August 6, 2026. As of this post, ATF hasn't announced a final version or new guidance implementing it.
Layer all three of these together — the Hemani ruling, the narrower "unlawful user" rule, and a Form 4473 rewrite that's been proposed but not finalized — and you get a real, ongoing shift, but not a settled one. Nobody should read any of this as "marijuana use no longer matters federally." What's actually true is narrower and still moving: the government's ability to prosecute based on use alone just got meaningfully harder, the agency's own internal standard for what counts as a disqualifying "user" just got tighter, and the form buyers sign is expected to change but hasn't yet.
What this means if you're in Colorado
The developments discussed here are federal: the current Form 4473 language, the federal statute Hemani limited as applied in that case, and ATF rulemaking that remains in motion. Colorado's marijuana framework does not resolve those federal questions. If you're a Colorado medical or recreational marijuana user who also wants to buy or possess a firearm, this is an unsettled, actively changing issue worth discussing with an attorney rather than assuming either "it's all fine now" or "nothing changed"—both oversimplify where things stand as of this writing.
As always, we are not lawyers—just Colorado citizens trying to understand the rules, statutes, and court decisions and share what we learn. The information on this website is for general informational purposes only and does not constitute legal advice, nor does it create an attorney/client relationship. The accuracy, completeness, or currency of the content is not warranted. Your use of content on this website is at your own risk. Consult an attorney about your specific circumstances.
