Robert Mangum, right, assists member Nate Murray in purchasing medical marijuana products at the Green Hope Patient Network, Tuesday, Dec. 14, 2010, in Shoreline, Wash. The Washington State Department... more 
Robert Mangum, right, assists member Nate Murray in purchasing medical marijuana products at the Green Hope Patient Network, Tuesday, Dec. 14, 2010, in Shoreline, Wash. The Washington State Department of Revenue recently mailed letters to 90 dispensaries and related organizations, insisting that medical marijuana is not exempt from state sales tax. (AP Photo) less 
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Associated Press
Thu, Dec 16, 2010 4:16 PM EST