Ean Seeb and Andy Betts of Denver Relief help patients select a strain of marijuana for purchase in the dispensary room of their facility. The dispensary is located adjascent to the Cop Shop, a store catering to police officers. Denver Releif's proprietors were selected from more than a dozen dispensary applicants for the retail space in the centrally located office building. ..Denver-based medical marijuana dispensaries --Colorado is one of 19 states to permit the medicinal use of marijuana. In the city of Denver, well over 100 marijuana dispensaries have sprung up to meet the demand. Patients are required to register with the state and have a valid doctor's note for dispensaries to sell them marijuana.