A marijuana leaf is displayed at Canna Pi medical marijuana dispensary in Seattle, Washington, in this November 27, 2012 file photo. Fifty-two percent of Americans support legalizing the use of marijuana, the first time polls have shown most Americans back legalization, a Pew Research Center poll showed April 4, 2013. REUTERS/Anthony Bolante/Files (UNITED STATES – Tags: SOCIETY DRUGS POLITICS HEALTH AGRICULTURE BUSINESS)
