Yesterday I heard St. Louis County running their lidar gun. They had about 6 chase cars out. The laser vehicle was a white un-marked pickup truck that sat ontop of JR. Kelly Dr (Just north of Manchester Rd). The officer was shooting south bound traffic. The operation ran for for approx 4 hours.
Maryland Heights Police were on MO-364 shooting laser at cars as they came east bound over the Missouri River.
Today, I hear the State Highway Patrol air unit up doing VASCAR, but I do not know of the location. My guess would be on I-270.