Wait, you thought they were going to stop with cameras that track your car??

Behold SignalTrace, an all-new technology wonder that captures wireless and Bluetooth and ties them to license plate readers like Flock cameras.

The Conversation offers a scenario to understand its application:

Imagine that you share a ride to work with the same colleague most mornings. As it passes by a license plate reader, the camera records the car, which can be linked through vehicle records to its registered owner. Beside it, another sensor detects signals broadcast by devices traveling nearby, such as your phone and your colleague's smartwatch.
After enough trips, software may treat some of those devices as a recurring electronic signature associated with the vehicle. Weeks later, one of the same device signals appears alongside a different car connected to an investigation. The signal itself may not contain its owner's name, but its previous association with a known vehicle gives investigators another clue they can use to work out who was carrying the device.

That's Orwellian enough that even Flock distanced themselves from SignalTrace...

...But they didn't go so far as to suggest the two technologies can't be used in tandem.

In other words, a cop can now stalk an ex-lover no matter what car they're in by tracking their Bluetooth, WiFi, and other radio signatures that are unique to each of their electronic devices.

I hate to be a paranoid prepper, but Faraday bags have never looked so tempting.