Participants chat in a corner room during the 2nd National Marijuana Business Conference and Expo in Auburn, Washington November 8, 2013. REUTERS/David Ryder (UNITED STATES - Tags: SOCIETY POLITICS ... more 
Participants chat in a corner room during the 2nd National Marijuana Business Conference and Expo in Auburn, Washington November 8, 2013. REUTERS/David Ryder (UNITED STATES - Tags: SOCIETY POLITICS DRUGS BUSINESS) less 
1 / 15
Reuters | Photo By DAVID RYDER / REUTERS
Fri, Nov 8, 2013 8:45 PM EST