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.
Doubt that will stop the US government.
But as someone else said above, if they have this much access to the place where they can gather the training data necessary to fine tune this to figure out where you are and track you through the space, they don’t need this.