Once I have a medical marijuana permit, how do I get cannabis?

Each state medical marijuana law allows patients with a doctor's authorization to grow, possess and use medical marijuana. There are dispensaries that sell marijuana and marijuana plants in California.

There are patient support groups in every medical marijuana state that give out or trade plants, strains and medicine. It is also legal for patients with a doctor's authorization to obtain cannabis and plants on the black market, though the person selling it is breaking the law (they probably know that), the patient is not.