If only other locations would be as forward thinking.
I challenge any one to provide a single case of a completely spontaneous school shooting where the "perp" had the weapon on their person.
Every case I have read about to date goes something like this, "After X period of time of Y happening person of interest decided to bring weapon(s) with them to school and proceeded to maim/wound/kill numerous innocent people."
Real shame that those in position to pass laws usually do not take the time to understand this.