Reporting from Mexico City and Washington— Last fall's slaying of Mario Gonzalez, the brother of a Mexican state prosecutor, shocked people on both sides of the border. Sensational news reports revealed that cartel hit men had tortured Gonzalez, and forced him to make a videotaped "confession" that his high-powered sister was on the take. But American authorities concealed one disturbing fact about the case from their Mexican counterparts: U.S. federal agents had... (GunPolicy.org)