Lisa Ling steps into the world of marijuana cultivators, reporting from secret farms and not-so-secret grow houses.The big question after all these years and scientific findings, is why the US government still classifies marijuana as a class one drug, akin to heroin and crank. It's a mystery, doctors will tell you the miracles it works for the chronically ill, cancer patients and for a natural sleep aid. It's a crop that earns more than corn, and Americans grow some of the best of it in the world. The legitimate earning potential for farmers and distributors is astronomical.
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