WASHINGTON, DC

Qualifying patients or their caregivers may possess no more than two ounces of cannabis at any one time and must obtain it from a licensed distribution. Four medical cannabis distribution centers in the District of Columbia have been approved by the Department of Health as of June 2012 and should be operational in summer 2012. Six cultivation centers have been approved separately; each is restricted to cultivating no more than 95 plants. Qualifying conditions are limited to cancer, HIV/AIDS, glaucoma or severe muscle spasms; there are provisions for expanding the list.