Here is a solution an anonymous person posted about preventing school shooters from entering a classroom…
The person posted:
“A friend of mine is a high school teacher and this is her DIY solution in case of an active shooter.”
“She told me that she spent some time with a employee at Home Depot trying to think of an idea and this is what they came up with. I asked about someone breaking the glass, reaching through and unlatching the hook, she told me they measured in that it could not be reached.”
Regardless if it works or not, at least this is one solution for a very unfortunate situation us as Americans have to live with in today’s age.