Democratic presidential candidate Hillary Clinton responds to a question from Roland Martin, host of TV One's News One Now, during a town hall meeting at Claflin University in Orangeburg, S.C.,
Richard Burkhart/AP Images for TV One
Using chemicals to control bugs or mold is common among commercial cannabis growers. But with no federal oversight, experts are concerned growers may be using dangerous pesticides.
Ted S. Warren/AP
One of three marijuana plants growing in the backyard of a 65-year-old retiree from Pompano Beach, Fla. He grows and smokes his own "happy grass" to alleviate pain.