It is just crazy.
My wife works for a school district just south of us for a few schools.
Her office in one of the schools is the first door as you come in the building.
When someone comes in the building there is no one there to check you in, you have to go in the office. so you can just walk in and do as you want.
The teachers can not even have a small pocket knife, like the little swiss army knife is a no no. just crazy