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.
I was wondering about that. The article didn’t say anything about being able to identify the same person walking past a different router. And I can’t imagine the study didn’t try. So I assume it doesn’t work.