What are medical cannabis laws?
Medical cannabis laws are state rules that let people with qualifying conditions use cannabis with a physician's authorization. Roughly 38 states plus the District of Columbia, Guam, Puerto Rico, and the U.S. Virgin Islands run comprehensive medical programs. Federal law still lists cannabis as a Schedule I controlled substance, so state and federal rules do not match.
How do state medical cannabis programs differ?
Each state writes its own rules, so a patient card from one state rarely transfers to another. Most programs differ on qualifying conditions, possession limits, THC caps, home grow rights, and whether dispensaries must be state-licensed. Some states also charge annual registration fees and require renewals.
Qualifying conditions
- Common listings include chronic pain, cancer, epilepsy, glaucoma, PTSD, Crohn's disease, and multiple sclerosis.
- A few states allow any condition a physician certifies; others publish a closed list.
Possession limits and product caps
- Limits are usually counted in ounces of flower, milligrams of THC, or a 30-day supply.
- Concentrates, edibles, and tinctures often carry separate caps.
Does federal law recognize medical cannabis?
No. Cannabis remains federally illegal, and the FDA has not approved it as a medicine. Congress has passed appropriations riders since 2014 that bar the Justice Department from using funds to prosecute state-compliant medical cannabis patients and providers. The FDA has approved one cannabis-derived drug, Epidiolex, plus a few synthetic cannabinoid products.
Where does CBD fit into medical cannabis laws?
Hemp-derived CBD with no more than 0.3 percent THC is federally legal under the 2018 Farm Bill. That federal status does not override state rules, and some states restrict CBD sales, labeling, or age limits. Prescription CBD products sit under drug law instead of hemp law.
What should patients check before buying?
- Confirm the product's legal status in your state.
- Ask for a certificate of analysis from an ISO-accredited lab.
- Check the THC content against your state's cap.
Is a medical cannabis card required?
In most medical-only states, yes. Recreational states may not require a card, though a card can lower taxes or raise possession limits.
Can I travel with medical cannabis?
Not across state lines, and never through federal property such as airports with federal jurisdiction. Transporting cannabis across a state border is a federal offense even when both states allow it.