Short answer
Yes. A federal agent can arrest you for cannabis possession or sale in a state where it is legal. State law does not bind federal officers. Federal law lists cannabis as a Schedule I controlled substance under 21 U.S.C. § 812. No state ballot measure changes that schedule.
is cannabis federally legal in the united states
How the two systems overlap
The Controlled Substances Act of 1970 bans possession, cultivation, and distribution of cannabis. Federal penalties run from 21 U.S.C. § 844 for simple possession to 21 U.S.C. § 841 for manufacture and distribution. A first simple possession offense carries up to 1 year in prison and a $1,000 minimum fine. Distribution of 1,000 kilograms or more carries 10 years to life.
what does schedule 1 mean for weed legality
DEA, FBI, ATF, and U.S. Attorney offices enforce those statutes. They operate in all 50 states. A state license to sell does not work as a defense in a federal charging document.
Does Federal Law Allow Medical Marijuana Patients?
What limits federal agents
Congress has used appropriations riders to restrict Justice Department spending. Since 2014, an amendment (Rohrabacher-Farr, later Rohrabacher-Blumer) bars DOJ from using funds to prevent states from carrying out their medical cannabis laws. The 9th Circuit ruled in United States v. McIntosh (2016) that defendants who comply with state medical cannabis rules cannot be prosecuted with those funds.
The rider covers medical programs. It does not cover adult-use programs. Congress must renew it each fiscal year.
Where federal arrests happen
- Federal land: national parks, national forests, military bases, federal courthouses. Possession is a federal offense there, no matter the state law.
- Airports and border crossings, which sit under federal jurisdiction.
- Cases with interstate shipment, firearms, money laundering, or large weights.
- Distribution cases where a U.S. Attorney files charges after a state investigation.
Federal prosecutors hold discretion. Most file charges when federal interests appear: violence, trafficking networks, or interstate commerce.
Rescheduling status
In May 2024 the DEA proposed moving cannabis from Schedule I to Schedule III. As of early 2025 the rule is not final. Schedule III would not legalize possession. It would change tax rules and research access.
Consequences beyond prison
A federal drug conviction triggers immigration consequences. It can block naturalization and lead to removal. A federal conviction also bars firearm possession under 18 U.S.C. § 922(g).