17 states (I think it's 17 now that MA is included) allow marijuana for medical use. This is strictly grown, processed, and available only in specially controlled locations by valid medical prescription. I have never had a problem with that, nor I think has the federal government, because of the intended humanitarian use (and rather minimal amounts) of the drug. But now that Colorado and Washington have passed their bills to legalize recreational pot, somebody please splain me how is that going to work, when the federal government still recognizes pot as an illegal substance and at this time, has no intention of revising laws requiring prosecution?