[Aliska]

I bought a couple of these years ago when a killer was on the loose with whom I had had several previous angry confrontations. They work great. The only problem is one floor has slick tile and that one slips. That problem can be overcome with a flexible rubber jar opener or repositioning. I didn't depend just on these.

In a fluid situation with a shooter or hostage taker, odds are against they will spend a whole lot of time trying to breach the door but will look for an easier target.

There are many other devices on the market as well.

Still, kudos to the kid. Whatever best meets the needs. The only thing is you have to think on the offense side. If a person in the classroom wants to harm or take hostages, could they use something like this which would make breaching the door for rescue more difficult?

But if it were my child in a classroom, if this were the only tool available, it would give more of a chance of survival.

These sick people have evil minds, just like terrorists. They really are terrorists of the domestic sort. And they will get more and more creative to achieve their ends regardless of measures put in place to end the violence.

[editor-surveyor]

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Actually all of the school mass shooters have not been terrorists; they are mind-controlled drugged tools of the criminal state.