Des chercheurs parviennent "à voir" les individus en analysant les signaux Wifi ( article en anglais)
WiFi routers can see people through walls. Here's how it works
https://www.zmescience.com/feature-post/technology-articles/computer-science/wifi-router-sees-people-through-walls/
With the help of AI, the researchers were able to detect the movement of human bodies in a room using Wi-Fi routers -- even through walls.