In this Nov. 7, 2012 file photo, Jake Dimmock, co-owner of the Northwest Patient Resource Center medical marijuana dispensary, works with flowering plants in a grow room in Seattle. Congressional lawmakers from both parties are working to change U.S. marijuana laws, including altering tax codes to let marijuana dispensaries deduct business expenses on federal taxes, and changing banking laws to make it easier for marijuana-related businesses to get bank accounts. (AP Photo/Ted S. Warren, File)

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