Glass jars containing various strains of marijuana sit on a counter as sales associate Mattt Hart works at the 3D Dispensary on Friday, Dec. 19, 2014, in Denver. (AP Photo/David Zalubowski) ** FILE **
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Glass jars containing various strains of marijuana sit on a counter as sales associate Mattt Hart works at the 3D Dispensary on Friday, Dec. 19, 2014, in Denver. (AP Photo/David Zalubowski) ** FILE **
