Cities are already building their own tracking networks with APLR, Bluetooth, TPMS, toll transponders, etc. I would imagine someday, police will say geofence e

Cities are already building their own tracking networks with APLR, Bluetooth, TPMS, toll transponders, etc. I would imagine someday, police will say geofence every radio detected by a their (or third parties) sensors network and then drive around looking for those radios, or wait until they pass one of their detectors again.