Training all teachers and staff in all schools to know how to use a fire arms to defend their students if deadly force is used against the school. Require all teachers and staff to be trained in weapon disarming. Have surveillance cameras located throughout the school premises with armed guards to patrol the grounds during school hours or any after school activity. Also single lock doors on all classrooms where students can enter but not exit and anyone wanting in has to be let in by the teacher. Have hidden cameras in all hallways so teachers can see if the student is alone before opening the door. Lets stop these school killings.