Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
Even if you don’t have WiFi, this could easily be paired with a transmitter (WiFi router/AP). You’d need to make your dwelling into a faraday cage.
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