The [[National Institute for Money in State Politics]], in [[Helena]], [[Montana]], said last year that fewer than 10 percent of gun control measures introduced in state legislatures after [[mass murder|mass shooting]]s in 2012 became law. | The [[National Institute for Money in State Politics]], in [[Helena]], [[Montana]], said last year that fewer than 10 percent of gun control measures introduced in state legislatures after [[mass murder|mass shooting]]s in 2012 became law. |