[editor-surveyor]

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Will be effective only with a solid core door having a wide, full width frame element at the bottom of the door.
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[outofsalt]

"Will be effective only with a solid core door"

With solid core walls. Drywall is easily breached.

What people are forgetting is that if you fortify the building a determined psycho will wait for the Friday night game and target the bleachers. Or the school busses.