Cannabis law in the United States changes state by state, not all at once. As of this update, 24 states and the District of Columbia permit adult-use sales, most states run a medical program, and a small number allow only low-THC CBD products. Federal law has not changed. Cannabis remains a Schedule I controlled substance under the Controlled Substances Act, so a product that is legal in your state is still illegal under federal law, and carrying it across a state line remains a federal offense.
cannabis laws by state penalties
The three legal categories
- Adult use. Adults 21 and older may buy and possess set amounts from licensed retailers. Home grow rules vary by state.
- Medical only. A patient needs a state card or a doctor's certification. Dispensaries sell to registered patients.
- CBD only. Some states allow low-THC or THC-free products with no medical card. Others ban all cannabis products.
Federal law and why it matters at the counter
Congress has not removed cannabis from Schedule I. Federal agencies still enforce possession on federal land, at ports of entry, and in some federally regulated housing. State legalization protects you from state charges, not federal ones.
Cannabis Laws by State: Possession Limits Guide
How to verify your state's current status
- Find the state agency that licenses cannabis where you live. It is often the department of health, the department of revenue, or a dedicated cannabis control board.
- Read the current possession limit for the category that applies to you, whether that is an adult-use customer, a medical patient, or a caregiver.
- Check the effective date on any new law. Ballot measures usually pass in November and take effect months later, so the rules on the shelf today may not match the law you read about.
- Check county and city rules. Some states allow local bans on retail sales, which means a legal state can still have dry counties.
- Confirm testing and labeling requirements for the package you plan to buy.
- Keep the receipt. In a legal state, a licensed receipt is the simplest proof that your purchase came from a regulated source.
What state legalization does not cover
- Possession on federal land, including national parks and some military bases.
- Transport across state lines by any method.
- Driving under the influence, which is illegal in every state.
- Workplace rules. Employers may still test and set their own policies.
- Firearm purchases by cannabis users, under federal law.
Which updates to watch
States with medical programs tend to expand rather than close them, adding qualifying conditions, allowing telehealth renewals, or raising possession limits. States with adult-use programs more often revise packaging, potency caps, and tax rates. When a news headline and an agency bulletin disagree, trust the bulletin.
Cannabis Laws by State for Driving: THC Limits, Zero-Tolerance Rules, and DUI Penalties
Buying in a legal state
Buy from a licensed retailer, keep the product sealed until you leave the premises, and check the label for batch and testing information. Ask staff for the current possession limit if you plan to carry the product farther than your hotel. Rules for visitors sometimes differ from rules for residents.