Medical Uses Of Marijuana For several decades, researchers have sought to determine whether marijuana has legitimate medical uses, and narcotics control agencies have discouraged them from finding out. Now a new round of federally funded research may provide some answers-or will it? The latest skirmish between scientists and police comes on the heels of two popular referenda, in California and Arizona, legalizing the medical use of marijuana. But since it remains a federal crime to grow, sell, or prescribe cannabis, the referenda have created only a legal morass. Barry McCaffrey, director of the White House Office of National