http://www.nytimes.com/2011/11/07/opinion/reefer-madness.html?_r=1&ref=marijuana

“The Treasury Department has forced banks to close accounts of medical marijuana businesses operating legally under state law. The Internal Revenue Service has required dispensary owners to pay punitive taxes required of no other businesses. The Bureau of Alcohol, Tobacco, Firearms and Explosives recently ruled that state-sanctioned medical marijuana patients can not purchase firearms.” -NYTimes