ATLANTA — It's been a disappointing year for American cities seeking to curb violence via tough gun laws. Since last June, when the US Supreme Court struck down key parts of the District of Columbia's gun-control ordinance, cities have seen the 20,000 local gun regulations enacted over the years begin to slip from their grip, one by one. Philadelphia's ban on assault weapons and limits on handgun purchases are the latest to succumb, struck down Thursday by a state... (GunPolicy.org)