Schools should routinely hold lockdown or security drills to prepare students and staff for a potentially violent situation. Again, this is similar to what our schools already in case severe weather.
What is not needed is to bring guns into the schools by arming teachers. This policy would bring weapons into schools under the guise of protecting our children. But it would place a heavy burden on teachers to be trained to carry a weapon and could lead to violent altercations involving students who know guns are already on the premises.