Over the weekend I'm driving on a state road in NJ (Route 10). It's a 6 lane road with limited traffic lights and can be pretty wide open on the weekends. I'm coming over a ridge and heading down hill at about 70 MPH in I guess a 50 MPH zone. Light ahead is turning red, I start to slow down for the light. I local police car is sitting off to the side in a parking lot. He comes out behind me at the light. I'm sitting, he's sitting. When the light turns green, on come his lights. I make a right at the light, he follows me until I pull over. I'm frantically taking down my 9500i and putting it away lest I anger him by its presence. He comes to my window and asks for my license, registration, etc. Then he asks me if I know why he's pulled me over. I say no. He says: "I clocked you at 72 MPH in a 50 zone." I'm thinking, clocked me? My detector never went off. Not a whisper. Not a sound of any kind. Nothing. Silent. Thankfully, as I had a clean driving record, he decided to give me just a warning. But hey, what gives? My 9500i goes off all the time. Whenever there are cops in my town, on the highway, anywhere and everywhere. So how is this possible that he clocked me and it never made a peep? Is there some new stealth technology? Was he lying? Is it broken?