Slowly change the glass on the first floor of schools to bulletyproof Lexan and lock people out who do not have access.

If we slowly start to change over to Lexan bulletproof polycarbonate on the first floor of schools and lock out access to the buliding after school starts. This would stop anyone who is armed from shooting in the glass since Lexan is virtually bulletproof so that even if someone tried to shoot the glass, children and people will be protected. The cost is high for Lexan but a child's life is worth much more than what it cost to change the glass. The school could start to change the glass right around doors that enter the building first and then change any glass for Lexan around the first floor windows..