Bluetooth and WiFi constantly broadcast their MAC addresses so they may be discovered by other devices. These tyrannical surveillance cameras discover the MAC addresses and links the footprint to a license plate, and hence a person. Then they can track you whether you're in your car, someone elses's car, or no car at all. Leonardo's camera brochure brags about this ability. You can install the DeFlock app and start reporting the surveillance cameras, and maybe the Blade Runners will do their thing.