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It's also passive. Someone could stand outside your house or factory with their device and "illuminate" activity inside the building. Only EMF shielding in/on the walls could block them. Nation-state regulators could get involved, since these devices would be using spectrum that belongs to the public.

2012 article on a military use case, https://www.popsci.com/technology/article/2012-07/seeing-thr...

2017 video on an industrial use case, https://www.digitaltrends.com/cool-tech/wi-fi-radiation-tran...

This is very similar to radar, which raises the question, is radar already used to spy on peoples movements through walls?

X-Ray backscatter is definitely used for this, most famously by secret NYPD vans.


> The radars work like finely tuned motion detectors, using radio waves to zero in on movements as slight as human breathing from a distance of more than 50 feet. They can detect whether anyone is inside of a house, where they are and whether they are moving.

The cost of those devices should fall with 802.11bf Wi-Fi.

> the vans deliver a radiation dose 40 percent larger than delivered by a backscatter airport scanner; bystanders present when the van is in use are exposed to the radiation that the van emits… there may be significant health risks associated with the use of backscatter x-ray devices as these machines use ionizing radiation, a type of radiation long known to mutate DNA and cause cancer.

Could this radiation meter detect the presence of such a van?


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