After the atrocity in Newtown, Conn., in December 2012, when 20-year-old Adam Lanza killed 20 six- and seven-year-olds and six adult staffers at Sandy Hook Elementary, legislators around the country grasped for ways to prevent another such disaster. Some proposed arming school guards; others moved to ban guns from being kept at school by anyone. Debates raged over spending on metal detectors, more surveillance, combat training for teachers, and blastproof locks on classroom doors. In the wake of every school shooting since the 1999 Columbine massacre, these discussions have been endless because the stakes are so high and the solutions so imperfect. Lock every door, and the gunman can still shoot through a window. Arm the principal with a gun, and the shooter might disarm her, kill her, and gain another weapon. 

Full story here.