Bruce Barcott

Marijuana, scientifically known as Cannabis sativa, thrived underground as the nation's most popular illegal drug. Now the tide has shifted: In 1996, California passed the nation's first medical marijuana law, which allowed patients to grow it and use it with a doctor's permission. By 2010, twenty states and the District of Columbia had adopted medical pot laws. In 2012, Colorado and Washington state passed ballot measures legalizing marijuana for...