Jeffco Public Schools in Colorado are once again talking about metal detectors in the wake of last year’s shooting at Evergreen High School, where a student shot two classmates before turning the gun on himself. It’s the kind of conversation that follows almost every school shooting. Something visible has to be done. Something people can point to and say, “That will fix it.”
So now there’s been a new study, and the study, inconveniently, does not say what people hoping for a quick fix probably wanted it to say. It found no clear evidence that metal detectors reduce school violence. It also pointed out the obvious logistical reality that if schools want them to be effective, they would have to be consistently staffed or paired with closed-campus policies. In other words, you can’t just plop a metal detector in the hallway and call it a day.
Even the former executive director of school safety for Jeffco Public Schools isn’t exactly selling this as a cure-all. He points out they’re not 100 percent effective and references research suggesting they may only catch weapons about half the time. This is a man who might know a thing or two about school shootings in Jefferson County, considering the district’s history includes a little incident known as Columbine. When someone with that background tells you metal detectors are not a magic solution, it might be worth listening.
As I’ve said before, metal detectors only really work the way people imagine when every single person is screened individually, the way they do at airports. One at a time with bags being checked and no shortcuts. That system works because airports are designed around it, with controlled entry points, staffing, and the understanding that you’re going to stand in line and wait your turn.
Now try applying that to a high school with hundreds or thousands of students arriving within a narrow window of time, multiple entrances, and the expectation that kids get to class on time. You either create bottlenecks that turn the start of the school day into a daily security checkpoint, or you cut corners. And once you cut corners, the effectiveness drops.
What you’re left with, more often than not, is something that looks like security without actually delivering much of it. A visible measure that reassures adults while doing little to stop someone determined to get a weapon inside. That’s not safety; it’s security theater.
Metal detectors don’t come cheap either. The study estimates hundreds of thousands of dollars per school every year, on top of infrastructure costs. That’s a lot of money to spend on something that even its own proponents admit is far from foolproof. Meanwhile, the core issue remains untouched. Kids are still getting their hands on guns, and they’re still bringing them to school. The chain of events that leads to that moment does not begin at the school’s front door.
If school districts are serious about preventing the next shooting, they might want to think about where that money could actually make a difference, like education. Because metal detectors may look like action, but they don’t solve the problem they’re supposed to address.
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