They were stopping all vehicles entering the airport, backing up traffic. There seemed to be a separate lane for cab drivers. If you drive an SUV, forget it. They had every one of them pulled over when I drove by, running wand things all over them, looking inside, and practically fisting the drivers.
Cab driver also said if you're car is cluttered on the inside they'll pull you aside as well. According to him, taxi drivers now have to keep the inside of their vehicles uncluttered or get fined (but, cab drivers lie, so YMMV).