add a plugin method, e.g. radar detector
There is an iPhone app called "radar active" that allows realtime updates of speed traps. The sounds various radar detectors make (or dataports like on the Valentine V1) could be used to automatically add speed-trap / false alarm information to the map. Android has easy ways to add external hardware, but the microphone could be used on any platform with the right audio processing software.
either ONLY allow Valentine or tag input to allow us to ignore everything other than Valentine data/reports
combine this with trailing/leading police
to create 'target' overlays on the map based on signal density and confirmed coincidence