There has not been a mass shooting at a school since Sandy Hook.

The FBI's criteria for a mass shooting include 4 or more deaths at one site, not including the perpetrator. There have been school shootings, and attempts at shootings, but none has reached the mass level as defined. This should give us pause, not so much for a sense of relief, but rather to inquire "Why?" Have security procedures at schools fundamentally changed? Which procedure was in effect when an incident was thwarted? More armed security? Fewer points of campus ingress? School pack inspection? Cameras? Safe room lockdowns? More rapid response? Many who are concerned about school mass shootings have advocated for "hardening the target." Perhaps this is happening.

To each and all, have you seen stories, or have first-hand knowledge of new measures taken at schools? If so, let's talk about them.