radar detector users encouraged to read this

MacCool

A radar detector is going to help you with tickets, but no, you cannot rely on it. It will give you an edge, but it's no guarantee. They may be able to nail you if you're the only car on the road, but the excellent range of modern radar detectors can certainly let you know when the cop hits the guy 1/2 mile in front of you. Drive smart, use the traffic around you wisely and they are certainly a worthwhile investment. Over the years, radar detectors have cost me far less money than I'd ever spend on the tickets and insurance consequences that they've saved me.