alt Hacker NewsVaguely similar, since electrical wires emit EM fields that are disturbed by human bodies, you can use a special camera to see who's in a building based on those disturbances. I'm not sure how high-fidelity or easy to spoil it is, but this was real technology at least 15 years ago.
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cluckindan • yesterday at 11:46 PM
This is a feature in modern wifi routers and every single one is capable of detecting presence of multiple people within an apartment. With some training, movement can be distinguished from the data.
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xfinity is now selling a security product based on seeing people in your home with Wi-Fi signals