I taught at a high school with 10 acres under the roof on 3 floors, and over 100 exit doors that the students used during fire drills, etc. A simple pebble wedged into a self-locking door jamb disabled the one way panic bar system that was supposed to prevent entry from the outside, and the city fire marshall would arrest anyone who intentionally locked a fire exit during school hours. The pebble in the door trick allowed drug dealers to roam the halls at will, posing as students. People who haven't worked in a big school with thousands of students shouldn't pontificate about "what needs to be done"!
