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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.

https://www.theatlantic.com/politics/archive/2015/10/the-nyp...


> 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?

https://www.gqelectronicsllc.com/comersus/store/comersus_vie...




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