The better answer to school shootings is principles being acknowledged as keepers of the public trust on par with firemen and policemen; they are to be mandated to receive small arms training, a secure coded safe and one pistol. If they are uncomfortable with that, then they are to assign a teacher designate in ace of them out of the 30-90 teachers on campus. Cost<1000 usd. This is similar to flying on a plane near an emergency exit. We don't need militarized schools= common sense.