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

Hemp growers may try to block federal ban on marijuana extracts

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