Workers trim the buds of marijuana plants at Alternative Solutions, a DC area medical marijuana producer, April 20, 2016 in Washington, DC. Security cameras and barbed wire suggested this was the right place, an old warehouse on a dead-end street not far from the White House housing one of the few legal marijuana farms in the US capital. Alternative Solutions is one of seven facilities in Washington authorized to grow medical marijuana for nearly 3,700 local patients. / AFP / Brendan Smialowski / TO GO WITH AFP STORY by Elodie MAZEIN, "'Grown in Washington': the marijuana farms near US power hub" (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)