This maybe covered somewhere else but I couldn't find it. All the reviews on radar detectors I have read have all had radar directed at/towards an incoming vehicle. Now how well do the detectors work when the cop car is sitting on the side of the highway and is directing the radar with the direction of traffic. That is the officer hits you with radar when you are passing him.
Can the Escort x50, V1 or the RX65 be able to detect this? And if so, how far away can one of these units alert you BEFORE you pass the officer. I've had some units which couldn't detect any signal until I'm within a 100 feet of the police unit.
From a physics standpoint, this would be very difficult to detect as very few radar waves will scatter behind the Officer for any radar detector to alert you, even if the radar was on continuous mode.