Here is a police radar industry link to show you what you are up against.
http://www.mphindustries.com/pdfs/POP%20Technology.pdf
Just for the hell of it I picked up the best xrs 9570 cobra radar laser detector with POP, best buy had and went trolling for traps in the Z. I know ppl will say its a crap detector, but with their 15 day return policy I figured I would play around.
Overall it did indicate 4 mc cops with KA that came up behind me , in about a 10th. mile away, really no time to slow down if speeding. Next a local PD set up stationary KA band only tenth mile warning. Next ran into 3 situations of state police set up and the same thing KA warning only about 1/8 mile .
Next a state police following me keeping his distance, it didn't go off at all, even with him tailing me for 2 miles and keeping slightly under the limit.
Also tried to see if a laser pointer or infrared remote would trip the laser function and it did nothing.
Ended up returning it to best buy and just happened to run into another customer returning an escort 9500 ix and I told him what I encountered and he said the escort was about the same and didn't give adequate warning to slow down. He was returning it and waiting for the lastest escort model to hit the market.
I might try the top escort model when it comes in to really see if these work, with the best buy return policy its worth a shot, but so far from what I have encountered with the lastest cobra they are still useless.