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> Is it possible the metal detectors are actually working and not just security theater?

The results have been consistently poor over a long period of time. Just one example: https://web.archive.org/web/20181009074941/http:/oversight.h...

It's possible that they are doing something for sure, but also possible they're just a tiger rock.

What is a tiger rock?

Physically and visually impressive, but unlikely to get up and do anything

Simpsons reference. A rock that keeps tigers away. “You don’t see any tigers around here do you?”

And here is a clip of the relevant scene, from the episode "Much Apu About Nothing" (1996), https://www.youtube.com/watch?v=xSVqLHghLpw

Lisa : Dad, what if I were to tell you that this rock keeps away tigers.

Homer : Uh-huh, and how does it work?

Lisa : It doesn't work. It's just a stupid rock.

Homer : I see.

Lisa : But you don't see any tigers around, do you?

Homer : Lisa, I'd like to buy your rock.