I was beside a NC Trooper on the highway and I looked over in his car. His radar on the dash had Hld on the display. I was wondering if that was 'hold' and in standby mode. Guessing it was his IO radar, my x50 didnt pick up anything. In a different situation I got a weak KA from a trooper on the side of the highway right as I went by him. I had rabbits in front of me and never picked up anything until I got right beside him.