this post was submitted on 22 Apr 2025
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Those don't work well for two reasons:
The shooter can simply shoot the lone guard manning the metal detector. Schools don't have the resources to station a full SWAT team all day long at the front entrance.
An accomplice can open an emergency exit and let a gunman in through a side door. You need to have emergency exits for any public building.
Metal detectors are not as useful as one might think. They'll catch a kid who thinks it's OK to carry a gun around as an everyday carry item (think gang activity), but they don't stop actual school shooters. They can be useful to keep gang violence out of schools, but they won't stop mass shooter incidents.