FOID cards and cannabis in Illinois: what State Police, the ATF and the Supreme Court say

For adults 21+. General information, not legal advice. The linked statutes, agency pages and court opinion control; talk to a lawyer licensed in Illinois about your own situation. Nothing here is a health claim, a price claim or an offer to sell.

Illinois State Police say a medical cannabis card or lawful cannabis use alone won't get a FOID card revoked or an application denied. Federal law is separate: 18 U.S.C. 922(g)(3) bars unlawful drug users from having guns. In 2026 ATF revised its unlawful-user definition, and the Supreme Court decided United States v. Hemani.

Key facts - ISP: a medical cannabis license, caregiver status, or other cannabis use consistent with Illinois law will not, by itself, revoke a FOID or CCL or deny an application (Illinois State Police FOID page, checked Nov. 6, 2026). - ISP still posts a federal-law warning: 18 U.S.C. §922 restrictions remain until the medical card is revoked or relinquished, or until one year after last cannabis use, whichever is later (same ISP page, checked Nov. 6, 2026). - Federal statute: 18 U.S.C. 922(g)(3) bars an "unlawful user of or addicted to" a controlled substance from possessing a firearm (ATF interim final rule preamble, Jan. 22, 2026). - ATF, Jan. 22, 2026: revised the regulatory definition and removed the old single-use inference examples; regular use over an extended period continuing into the present is required (91 FR 2698). - United States v. Hemani (June 18, 2026): the government's prosecution of Mr. Hemani under §922(g)(3)'s unlawful-user provision was inconsistent with the Second Amendment; the Court called the decision narrow (slip opinion).

Illinois adults can buy and possess cannabis within the state's possession limits, and many of them also hold — or want — a Firearm Owner's Identification (FOID) card. State and federal rules answer that combination differently. Here's what Illinois State Police, the ATF and the Supreme Court have each said, as of Nov. 6, 2026.

Can you have a FOID card and use cannabis in Illinois?

On the state side, Illinois State Police say yes — lawful cannabis use alone is not a FOID disqualifier.

ISP's FOID page (checked Nov. 6, 2026) states:

"If you possess a Medical Marijuana License, are a caregiver pursuant to the Compassionate Use of Medical Cannabis Pilot Program Act, and/or otherwise use cannabis consistent with Illinois law, your FOID card or CCL will not be revoked nor will your application(s) denied. Medical Marijuana Licenses are state-issued and cannot result in the denial of any right or privilege."

That covers medical patients, caregivers and other people whose cannabis use tracks Illinois law. ISP then immediately points to federal law as a separate problem — the next section.

What does federal law say about cannabis users and guns?

Federal law is not the FOID Act. Under 18 U.S.C. 922(g)(3), it is unlawful for any person who is an "unlawful user of or addicted to any controlled substance" (as defined in the Controlled Substances Act) to ship, transport, possess or receive a firearm that has moved through interstate or foreign commerce. The ATF's January 2026 rule preamble restates that statutory bar.

ISP's FOID page still mirrors a long-standing federal-guidance warning. As of Nov. 6, 2026, the page says federal restrictions under the Gun Control Act of 1968, specifically 18 U.S.C. §922, "remain in effect until the revocation or relinquishment of your medical cannabis card or until one year after you last used cannabis, whichever is later." That one-year language was still posted when we opened the page; ISP had not rewritten it to reflect the ATF's 2026 definition change or the Hemani decision.

Cannabis scheduling itself is also in flux. The Justice Department's April 28, 2026 rule moved some medical marijuana to Schedule III, while Illinois adult-use marijuana remained Schedule I under that rule — details in our Schedule III medical-cannabis explainer and on our federal rules tracker. Scheduling changes do not, by themselves, rewrite 922(g)(3).

What did the ATF change in 2026?

On Jan. 22, 2026, ATF published an interim final rule in the Federal Register — Document Number 2026-01141, 91 FR 2698 — titled "Revising Definition of 'Unlawful User of or Addicted to Controlled Substance.'" It amends 27 CFR 478.11 and took effect the same day.

The rule's core change is how "unlawful user" is defined for firearms purposes. Under the revised text:

• An unlawful user is "a person who regularly uses a controlled substance over an extended period of time continuing into the present, without a lawful prescription or in a manner substantially different from that prescribed by a licensed physician."
• Unlawful use "requires evidence that the person has unlawfully used the substance with sufficient regularity and recency to indicate that the individual is actively engaged in such conduct."
• A person is not an unlawful user "if the person has ceased regularly unlawfully using the substance, or if the person's unlawful use is isolated or sporadic or does not otherwise demonstrate a pattern of ongoing use."

ATF also removed the older inference examples that had let a single recent admission, positive drug test or similar one-off incident stand in as proof of current use for NICS denials. The agency said those examples no longer matched court decisions requiring a pattern of regular use, and that future 922(g)(3) denials should rest on evidence of regular and recent use.

The rule is an interim final rule with a comment period; ATF said it may reassess the definition after Hemani and after public comments. It does not repeal 922(g)(3) itself.

What did the Supreme Court decide in Hemani?

In United States v. Hemani, No. 24-1234, decided June 18, 2026, the Supreme Court affirmed the Fifth Circuit and held that the government's prosecution of Ali Hemani under §922(g)(3)'s unlawful-user provision was inconsistent with the Second Amendment.

The facts the Court recited: Mr. Hemani admitted he used marijuana about every other day and possessed a gun in his home. The government charged him under 922(g)(3) based solely on that admitted marijuana use. It did not claim he was an addict, that his use had made him a danger to himself or others, or that he had misused the gun.

The government defended an automatic ban that, on its account, stripped an "unlawful user" of firearms from the moment of that status until it ended, without regard to the drug, the amount, or individualized danger. The Court rejected the government's historical analogy to "habitual drunkard" laws and held that prosecution, under that theory, failed the Second Amendment test set out in Bruen and Rahimi.

What Hemani does not decide. The opinion is explicit about its limits (slip op. pp. 18–19). The Court said it does not address:

• efforts to ban addicts from possessing a firearm;
• bans on people who are presently intoxicated;
• other prophylactic laws Congress might adopt after finding that users of a particular drug pose a special risk of misusing firearms;
• 18 U.S.C. §922(g)(1)'s provision disarming people convicted of felonies;
• whether the government could bring a 922(g)(3) prosecution accompanied by individualized proof that the defendant's drug use renders him a danger to himself or others, or proof that a certain drug always renders its users dangerous.

Hemani does not make it legal for every cannabis user to own a gun. It decides the prosecution that was before the Court.

What questions are still open?

Several.

ISP's posted federal guidance. As of Nov. 6, 2026, Illinois State Police still tell FOID applicants that federal 922 restrictions last until the medical card ends or one year after last use, whichever is later. That paragraph had not been updated to cite the ATF's January 2026 definition or Hemani. Whether ISP revises the page later is a separate question from what the page currently says.

How NICS and dealers apply the new ATF definition. The interim final rule tells NICS and ATF to stop relying on the old single-use inference examples and to look for regular, recent use. Case-by-case facts still matter, and the comment period was open when the rule published.

What Hemani leaves for later cases. The Court left open prosecutions with individualized danger proof, addiction-based applications, intoxication-based rules, felony-disarmament questions and new Congress-written prophylactic schemes. Lower courts will test those lines.

Scheduling and adult-use. Medical cannabis under a state medical license moved to Schedule III in April 2026 for covered products; Illinois adult-use activity remained Schedule I under that rule (our Schedule III story; federal tracker). How scheduling interacts with "unlawful user" status for a given person is a fact-specific federal question this guide does not answer.

None of this is legal advice. For a personal FOID, CCL or federal-firearms question, talk to a lawyer who practices in Illinois and knows both the FOID Act and federal firearms law.

Frequently asked questions

Will Illinois revoke my FOID for having a medical cannabis card? No, not for that reason alone, according to Illinois State Police. ISP's FOID page says a medical marijuana license, caregiver status, or other cannabis use consistent with Illinois law will not revoke a FOID or CCL or deny an application.

Does Hemani make it legal for every cannabis user to own a gun? No. The Court held that the government's prosecution of Mr. Hemani under §922(g)(3)'s unlawful-user provision was inconsistent with the Second Amendment. It said the decision is narrow and does not address addicts, people presently intoxicated, other prophylactic laws, §922(g)(1) felony disarmament, or prosecutions with individualized proof of danger.

Is ISP's one-year federal guidance still posted? Yes, as of Nov. 6, 2026. ISP still says federal 18 U.S.C. §922 restrictions remain until the medical card is revoked or relinquished, or until one year after last cannabis use, whichever is later. ISP had not rewritten that paragraph after the ATF rule or Hemani.

Where can I read the ATF definition of unlawful user? In the ATF interim final rule published Jan. 22, 2026, in the Federal Register (91 FR 2698; Document Number 2026-01141), which revises 27 CFR 478.11.

Can you have a FOID card and a medical card in Illinois? Under ISP's posted guidance, holding a medical cannabis license does not, by itself, cause FOID denial or revocation. Federal firearms law is a separate question under 18 U.S.C. 922(g)(3), the ATF's 2026 definition and Hemani.

Sources

• Firearm Owner's Identification (FOID) (Illinois State Police)
• Revising Definition of "Unlawful User of or Addicted to Controlled Substance" (Federal Register / ATF, Jan. 22, 2026)
• United States v. Hemani, No. 24-1234 (Supreme Court of the United States, June 18, 2026)
• Federal cannabis rules (The Highline Report)
• Schedule III for medical cannabis: what it means in Illinois (The Highline Report)
• Illinois cannabis possession limits (The Highline Report)

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Sources were opened and checked Nov. 6, 2026. Laws and agency pages can change; the linked primary sources control. Drafted with AI assistance from primary sources. Written and edited by The Highline Report newsroom under Monsaur Othman's editorial standards. Read how we use AI, our editorial policy and our corrections policy.

For adults 21+. News and education only. General information, not legal advice. Nothing here is a health claim or an offer to sell.