Good idea.
Volunteer teachers and staff who are willing to defend their school.
Screened and given background checks for suitability.
Interviewed by local law enforcement on protocol and legal limits in their location.
Intensively trained in CCW and self defense.
Nobody knows their students and facilities like the teachers and staff who work there every day. It's common sense.
More gun control and "gun free zones" simply creates a helpless, defenseless quarry for the next deranged killer.