One last time guys ........ I'm NOT in favor of doing away with the 2nd amendment. The far left who may want that - I disagree with. I truly believe that most folks of any political tag want metal detectors, 1 point entries, and armed guards. I'd be in favor of screening out mental cases - but I don't profess to know the answer to how the guidelines would be set up. I get the Viet Nam vet, or Afghan or Iraq vets who have PTSD, and how you account for them.
Any steps that are agreed to will never prevent shootings 100%. But should society throw in the towel and say no improvement is worth the effort ?? I'd bet metal detectors, single point entries with cameras - and I'll go a step further - double steel doors, would stop 95% or better of school shootings. With double doors, if a person steps inside the 1st door, and they have to go through a metal detector - and it picks up a possible weapon, BOTH doors automatically lock and they are trapped between those doors until an armed guard can get there. Easy.