Escort Passport 8500X50 Radar Detector

bought mine brand new ( it was on ebay so who knows what i got ) but it was from a seller with good feedback and was selling alot of them , i was in a situation where i know i was hit with laser ..... however i never got a alert , one time i was the only car on the road , we came up a hill at night , the cop was sitting on the side road sideways and when our headlights hit him we could see he was pointing the laser gun at us ( held up to his eye like lasers are and not radar ) my 8500 is one the dash with a clear view of him , nothing . then as we go by him a car is coming up behind us , the cop then turns his lights on and pulls the car behind us over , luckily i wasn't speeding , however my 8500 never went off , i had a few occasions like this , so i sold it , now looking for something that wont let me down !!