Federal law still applies in every state
Cannabis is a Schedule I controlled substance under the federal Controlled Substances Act (CSA). That status does not change when a state legalizes medical or adult use. A state law removes state penalties. It cannot repeal federal law or bind federal agencies. Possession, cultivation, and sale remain federal offenses in all 50 states, the District of Columbia, and the territories.
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Enforcement looks different from the statute. Federal prosecutors in states with regulated markets tend to focus on interstate trafficking, unlicensed operations, diversion to minors, and violence tied to illegal sales. The legal conflict itself does not disappear. Anyone who holds, grows, or sells cannabis is exposed to federal charges no matter what their state allows.
Where state legalization stands
As of 2025, 39 states, the District of Columbia, and several territories run medical cannabis programs. Adult use is legal in 24 states, plus DC and three territories. States that have not acted keep cannabis prohibited at both levels. Programs differ on possession limits, home grow rules, licensing, taxes, and product testing.
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Federal rules that shape state markets
Schedule I and the CSA
Schedule I means the federal government classifies cannabis as having no accepted medical use and a high potential for abuse. That listing drives banking limits, tax limits, and research barriers for licensed state operators.
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DOJ enforcement memos
The 2013 Cole Memorandum told federal prosecutors to deprioritize enforcement in states with strong regulations. The Department of Justice rescinded it in January 2018. No replacement memo offers the same guidance, so federal priorities sit with each US Attorney.
Appropriations rider for medical programs
Since 2014, annual appropriations language has barred the DOJ from spending funds to prevent states from carrying out medical cannabis programs. The protection covers medical use only, not adult use, and it depends on renewal each funding cycle.
Hemp is a separate category
The 2018 Farm Bill removed hemp from the CSA definition of marijuana. Hemp is cannabis with delta-9 THC at or below 0.3 percent on a dry weight basis. Hemp-derived intoxicating cannabinoids sit in a gray zone, and several states have moved to restrict them.
Rescheduling
In May 2024, the DEA proposed moving marijuana from Schedule I to Schedule III. Administrative hearings followed. A final rule has not taken effect. Schedule III would ease some federal tax and research problems, but it would not legalize state adult-use markets or end federal criminal exposure for unregistered activity.
Consequences that follow from the split
- Banking: most federally insured banks avoid cannabis accounts. The SAFER Banking Act has not become law.
- Taxes: IRC section 280E blocks normal business deductions for Schedule I and II operations.
- Transport: carrying cannabis into another state, even one that permits it, can be charged as federal trafficking.
- Federal property: national parks, military bases, and federal buildings fall under federal jurisdiction.
- Firearms: 18 U.S.C. section 922(g)(3) bars unlawful users of controlled substances from possessing guns.
- Immigration: cannabis use or work can affect visa applications and naturalization.
- Employment: DOT testing rules, federal contracts, and security clearances follow federal standards.
How to check your position under both systems
- Identify your state's category: adult use, medical only, CBD-limited, or prohibited.
- Read the state statute for possession limits, home grow counts, and purchase caps.
- Check county and city ordinances, since local bans are common in legal states.
- Note any federal jurisdiction where you live, work, or travel, including parks and military land.
- Confirm your employer's policy in writing before you use or possess anything.
- Keep cannabis inside the state where you bought it and carry your patient card if you hold one.
What would change the picture
Only Congress can remove marijuana from the CSA. Options discussed in recent sessions include full descheduling, a rescheduling framework, and protections for state programs. None has been enacted. Until that changes, the answer stays the same: state legalization creates a state-law defense, not a federal one.