He had written to the two agencies involved in the Reno problems seeking answers.One high-profile case that was turned down by the Arizona U.S. Attorney???s office involved a man who had purchased and transported hundreds of inert grenade hulls, pins and other materials to Mexico, according to an Oct. 12, 2011, letter obtained by the RGJ, written by Grassley and Rep. Darrell Issa to U.S. Attorney