More than half of U.S. states and the District of Columbia have legalized medical marijuana in some form, and more are considering bills to do the same. Yet while many people are using marijuana, the FDA has only approved it for treatment of two rare and severe forms of epilepsy, Dravet syndrome and Lennox-Gastaut syndrome.
Why hasn’t more research been done? One reason is that the U.S. Drug Enforcement Administration (DEA) considers marijuana a Schedule I drug, the same as heroin, LSD, and ecstasy, and likely to be abused and lacking in medical value. Because of that, researchers need a special license to study it, says Marcel Bonn-Miller, PhD, a substance abuse specialist at the University of Pennsylvania Perelman School of Medicine.
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