Ok I live in pa but i drive to exit 19 on 80 for work. Lately i have seen the staties standing or sitting in there car with the door open and aimings something at on coming traffic. No i have a radar detector and i usually get all the cops that are hiding. but for some reason these cops are standing up in plan open view and my detector is not going off. what is it that they are doing, and why doesn't my detector pick them up?