School has changed and the changes have not been caused by the educational system.
Many of the school buildings I have worked in have posters on the walls in each classroom right next to the tornado and fire drill instructions that detail the following things:
What to do in case of an intruder/suspicious person
What to do in case of an abusive parent
What do to in the case of gunfire in the neighborhood?
What to do in case of gunfire while on the playground
What to do in case of gunfire in the building.
Additionally each teacher has a placard for their use that detailed some more potential problems and the prescribed action to take. The list included:
Disorder or Riot
Nothing on the walls about wearing a belt, chewing gum, tucking in your shirt, or how long your skirt is!