I have been pulled over twice, once by squad car that flashed his headlights at me, second time by unmarked Subaru Forrester that had pulled out from his little hiding place. Both times they tailed me for a wee bit. I presumed it was to contact station and check if car legitimate, but that is assuming they have capabilites that proper foces have in detecting stolen cars or incorrect false plates. Also been pulled over by siren flashing handwaving leather glad village people wantabee motorbike cop. I was just back from states and had forgotten about the turn on red signal. He reminded me of course that it wasn't done in this state and handed me contribution form to the bertie waste of money team. Also have known guards to use private cars to catch people at speedtraps. Thus the lookout for the Dub reged cars doesn't work. Here they tend to use big van with cameras pointed out back window but recently in New Zealand I noticed they had used old Toyota camper van/minbus. Only obvious thing was it was parked where no tourist would bother stopping.