Really... not only can I keep my knife on me at school... I'm not prohibited from carrying my pistol. In fact, knowing a certain percentage of staff have concealed weapons permits is considered part of the school's emergency plan in case of an armed gunman pulling something like what happened at VT.
It'll never happen here. Even though Louisiana is a gun "friendly" state. They've bought into the 'Zero Tolerance' ideology. They even banned smoking on school property (for the staff - duh). When I was still on analogs, I'd either have to cross the road or walk over to an adjacent property to get my smoke break.