Assistant manager Dunn Ericson refills a jar of medical marijuana at the River Rock Medical Marijuana Center in Denver, Colorado, on May 16, 2013. (Anthony Souffle/Chicago Tribune/MCT via Getty Images)
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Assistant manager Dunn Ericson refills a jar of medical marijuana at the River Rock Medical Marijuana Center in Denver, Colorado, on May 16, 2013. (Anthony Souffle/Chicago Tribune/MCT via Getty Images)
