Phoenix New Times:  “The U.S. Alcohol, Tobacco and Firearms Bureau, the same agency that lets drug cartel members buy guns, is warning firearms dealers not to sell to medical marijuana users.  In an open letter to the nation’s licensed firearms sellers, the ATF reminds dealers that federal law prohibits any user of a controlled substance from possessing or buying guns.  A standard form filled out by gun buyers asks if the buyer is a ‘user of’ or ‘addicted’ to any controlled substance — checking ‘yes’ effectively cancels the sale.”