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Re:How to Find Hidden Cameras and Spy Gear by rococode on Thursday January 17, 2019 @02:33AM (#18929053)
Not a technical explanation but a story about a similar thing:

https://www.wired.com/2009/09/russian-billionaire-installs-a...

I remember this article as the first time I learned that photo-taking can actually be detected. Given that it was written in 2009, I imagine that the general camera-detecting technology has been mostly figured out by now.

Re:How to Find Hidden Cameras and Spy Gear by Antonio123123 on Thursday January 17, 2019 @06:37AM (#18930018)
So when it detects a lens, it shoots light to destroy the photo.

If the detection is not ideal, it could detect eyeglasses and shoot light into people's eyes