The FDA said in a statement that it and other agencies with the Health and Human Services Department had "concluded that no sound scientific studies supported medical use of marijuana for treatment in the United States, and no animal or human data supported the safety or efficacy of marijuana for general medical use."
A number of states have passed legislation allowing marijuana use for medical purposes, but the FDA said, "These measures are inconsistent with efforts to ensure that medications undergo the rigorous scientific scrutiny of the FDA approval process and are proven safe and effective."
