Too lazy to edit but:
http://www.skylinesaustralia.com/forums/in...t&p=3560020
Most radar's do not have a flash, if the radar operator sees someone doing high speeds they would radio the chasing car (in this case I assume it would be the unmarked commonwh0re parked 2km down the road) telling them that x person is speeding and to chase em down.
However there are new radar setups where the radar is on the ground and the camera is behind it. They need to have a good lock on ~3secs then takes a photo immediately. Quite easy to notice this.
I think all police officers are being currently trained to operate radars, all HWP's know how to use radar's already.
As for your case, ADR's specifies 10% tolerence for speeds, so maybe you are being paranoid.