I just bought a new Escort 8500 X50 radar detector and installed it as soon as I got it. After driving around for the day, im wondering why it hadnt beeped when I saw a cop-car on the side of the road(speedtrap), cop passing me in the opposite direction, and a group of cops with their lights blaring after having pulled some1 over?? The manual says that if the detector doesnt beep, then the police doesnt have his radar on, well I thought that was true until I passed about 5 more cops and the thing still didnt go off.

Is this normal or wtf? Has any1 else had this problem?