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Incandescent lamps will also present the flicker

I agree, Detector Vans are mostly a deterrent, but nothing technological about them

Most "TV detection" that's done is actually someone looking at the window and seeing a TV, or by other means.



There's always this, although it probably doesn't work on LCD screens:

https://www.cl.cam.ac.uk/~mgk25/ieee02-optical.pdf




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