Mayor Bloomberg called for toughening the nation's gun-purchasing background check system Thursday. His demands included closing a loophole that would have prevented the drug-addicted Arizona assassin from buying a firearm. Madman Jared Lee Loughner shot 20 people at point-blank rage - including Rep. Gabrielle Giffords - but never should have been allowed to purchase a gun if a background screening was done correctly, Bloomberg argued. "The law says that drug abusers... (GunPolicy.org)