I picked up Ka one direction and the return was K, never saw the return cop but he was there because there were no blips the whole trip. Noticed something strange when all of my fellow travelers slowed from 85-95 to 65-70, low and behold the section just off of I-10 on the way to Port Arther, was a State Trooper and he was making rounds with the unit on the whole time Ka. The return trip, I suspect it was an unmarked behind an 18-wheeler tailgate, he was using instant on K, and he knew how to use it.