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Lewis Koski, left, chief investigator of the Colorado Marijuana Enforcement Division, demonstrates a handheld radio-frequency reader, which is part of its new marijuana inventory tracking system, known as MITS, during a news conference, in Denver, Wednesday, Dec. 11, 2013. Ron Kammerzell, the senior director of enforcement for the Colorado Dept. of Revenue, is pictured at right. Roughly 150 Colorado medical marijuana dispensaries are hoping to begin selling to recreational users when it becomes legal to sell on Jan. 1, 2014. (AP Photo/Brennan Linsley)