Last night I was driving and picked up a cop shooting constant on Ka on the side of the road and decided to see how long of a detection range I could get. I looped around some back roads and he wasn't where he was before. About a mile down, my X50 picked up Ka and steadily increased to three bars when I hit a red light. Then I would get alternating readings of POP and Ka for about five seconds each. I confirmed that it was a cop (not sure if it was the same one) as I saw him about 3/4 of a mile down the road. This was a local cop too, so wondering if this couldve been an actual POP encounter? Weird thing was is that it was a constant siginal, whether POP or Ka. Any thoughts?