PHOENIX — Police have arrested an American man who allegedly smuggled parts for as many as 2,000 grenades into Mexico for drug cartels, more than a year after he was released by U.S. agents who stopped him at the Arizona-Mexico border for having more than a hundred grenade parts. While a Department of Justice official said the case will be added to the investigation of Operation Fast and Furious, a flawed effort by the Bureau of Alcohol, Tobacco, Firearms and... (GunPolicy.org)