Marijuana use continues to attract interest and fuel controversy. Big, green pot leaves have adorned the covers of Time, National Review, and Forbes. Almost 100 million Americans have tried marijuana at least once. Groups such as The National Organization for the Reform of Marijuana (NORML) and The Marijuana Policy Project (MPP) have tens of thousands of members. Polls suggest that 70-80% of Americans support medicinal marijuana. At least 11 U.S. states have experimented with decriminalization and medical marijuana laws, with new initiatives appearing each year....