NPR continues its examination of medical marijuana: "Fourteen states and the District of Columbia have launched a medical experiment that doesn't follow any of the rules of science. By approving the use of marijuana as a medicine - with varying kinds of restrictions - these jurisdictions are bypassing the federal government's elaborate processes for approving medicines." "That's highly unusual. In fact, it's only happened once in recent memory: In the late 1970s, about half the states legalized the use of laetrile, an extract of apricot pits, as a cancer treatment... 
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