Short answer
Medical marijuana is regulated at the state level in the United States. There is no single federal medical cannabis program. Each state that allows it sets its own qualifying conditions, requires a physician certification or recommendation, issues patient cards or registrations, and caps possession and purchase amounts. Cannabis remains a Schedule I substance under federal law, while hemp-derived CBD is legal under the 2018 Farm Bill, with state rules on sales and labeling. A product legal in one state may be illegal in another.
Medical Marijuana Regulations by State: A Buyer's Guide
Who sets the rules
State legislatures pass medical cannabis statutes, and state agencies write the details. Health departments handle patient registration and physician certification. Agriculture or cannabis control boards handle cultivation, testing labs, packaging, and dispensary licensing. Local governments may add zoning, operating hours, and storefront limits. Federal agencies do not approve medical marijuana, and the FDA has not approved cannabis as a medicine.
What state programs require
- Confirm the condition qualifies. State lists vary and can include cancer, epilepsy, chronic pain, and PTSD. Some states let physicians certify any condition they believe benefits.
- Get certification from a licensed physician in the state. Most states require an in-person or telehealth visit and a written recommendation.
- Register with the state and pay the fee. You receive a patient card or an electronic record. Some states allow caregivers.
- Buy only from licensed dispensaries. Unlicensed sales fall outside testing and age rules.
- Stay inside the possession and purchase limit. Limits count in ounces, grams, or a 30-day supply, depending on the state.
Product testing and labeling
Licensed medical markets require lab testing for potency, pesticides, heavy metals, mold, and residual solvents. Labels list cannabinoid content, batch numbers, and expiration dates. Keep the label and receipt. If a product causes a reaction, the batch number is the first thing a health department asks for.
Medical Marijuana Laws by State Guide
Medical cannabis compared with CBD
Hemp CBD and medical marijuana are regulated under different frameworks. Hemp must contain no more than 0.3 percent THC on a dry weight basis under federal law, and states license growers and retailers. Medical cannabis products can exceed that THC limit and are sold only through state-licensed dispensaries to registered patients. A CBD product sold online is not a substitute for a state medical card, and a medical card does not authorize online hemp purchases from another state.
Medical Marijuana Legislation Guide
What to check before you buy
- Is the seller licensed in your state, and is the license number posted?
- Does the label show a batch number and a third-party lab result?
- Does the THC content fit your state hemp or medical limits?
- Are there age limits and purchase caps that apply to you?
Common mistakes
- Assuming a card from one state works in another. Most states do not honor out-of-state medical cards, and none are universal.
- Carrying cannabis across state lines, including on flights. Federal law applies at borders and airports.
- Treating a CBD label claim as an approved medical claim. The FDA does not approve CBD as a treatment for any condition.