Part of the ventilation system in the  Bud Room  in the Green Room medical marijuana dispensary in Boulder on Monday. The city’s code requires
Part of the ventilation system in the Bud Room in the Green Room medical marijuana dispensary in Boulder on Monday. The city's code requires medical marijuana businesses to have proper ventilation, so that the odor of the plant cannot be detected by a person with a normal sense of smell outside the building. (Paul Aiken/Camera)