In this Tuesday, Dec. 30, 2014, photo, Cannabis City clerk John Golby, left, helps customers looking over a display case of marijuana products at the shop in Seattle. A year into the nation’s experiment with legal, taxed marijuana sales, Washington and Colorado find themselves with a cautionary tale for Oregon, Alaska or other states that might follow suit: They’re wrestling not with the federal interference many initially feared, but with competition from their own medical marijuana systems or even outright black market sales. (AP Photo/Elaine Thompson)
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