The biggest key is open and mature dialogue where everyone is listened to and their input valued. The students are the key to a safe school. If they feel that their concerns are taken seious then they will report any thrests to their school and their safety. A good SRO and school administration working together can be a great proactive team to head off potential problems and threats of safety to your school. When students realize that they are the key and start reporting threats made and take the lead you will see a big difference in you school.
Students are the greatest at recognizing what is going on in their school.
God bless you and keep His protection on you and your school. I encourage each student and parent to continually pray for their students and their schools.