Where I live, the students would raid that cabinet before the teacher could get to it.On the subject of armed teachers, rather than carrying a personal weapon, which can be cumbersome and uncomfortable, especially in summer, the notion occurs to me of a secure cabinet fastened to a wall in every classroom's closet and containing a loaded 12 ga. pump shotgun. This cabinet will be secured with a strong lock which only selected, willing, well-trained and certified-as-capable teachers would be provided a necklaced key for.
If a shooter entered such a school, rather than having dozens of teachers cowering helplessly in their classrooms along with their students it would be a matter of time before one (or more) of those teachers would be able to take the shooter out.
Feasible idea? Or not?
Just make all teachers take police classes and firearms classes in order to attain their teaching certificates and then arm them in full SWAT gear..