Oil containing CBD from agricultural hemp is displayed at the Marijuana Business Conference & Expo in Chicago on May 20, 2015.
Oil containing CBD from agricultural hemp is displayed at the Marijuana Business Conference & Expo in Chicago on May 20, 2015. Carla K. Johnson AP
Oil containing CBD from agricultural hemp is displayed at the Marijuana Business Conference & Expo in Chicago on May 20, 2015. Carla K. Johnson AP