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This area is shifting fast in 2026, so treat any single rule as a starting point, not the last word. On travel: after state-licensed medical cannabis moved to Schedule III in April 2026, TSA updated its 'What Can I Bring?' page to list medical marijuana as allowed in carry-on and checked bags with 'special instructions' — but TSA says its actual screening policy hasn't changed, its officers look for security threats rather than drugs, the final decision rests with the officer, and none of this shields you from the laws of the state you land in (interstate and international travel stay risky). On firearms: federal law (Section 922(g)(3)) still bars 'unlawful users' of a controlled substance from buying or possessing guns, and knowingly lying on the background-check form is a felony — that part hasn't changed. What is changing is the form: ATF's draft Form 4473, open for public comment through August 2026, would stop singling out medical-marijuana patients and aim the warning at recreational use, tracking the Schedule III shift — but a form is not the law, and only Congress or the courts can undo the underlying ban.