Two changes will stop the majority of school shootings.
1) require all teachers to pass a background check, just as if they were buying a gun and then require, mandatory, annual gun safety classes. Specific instructions on how to render different firearms safe.
2) allow teachers who have their CW to carry at school.
Most school districts now require extensive background checks for hiring the teachers in the first place. And those districts in Texas and Colorado have already begun
gun and safety training for their teachers. The
latter is far more necessary than the former. But don't have teachers who already own guns conceal them. Let
the kids see them holstered. Let the word get 'round that, yes, the faculty is armed, and maybe the vice principal, too. That just might get a potential school shooter
to think twice. And if he doesn't? Go ahead, make their day . . . ;)