Two cops in a completely unmarked white Crown Victoria with no license plates or anything identifying at all have been cruising around near my college campus for the past few weeks. The car doesn't have the light bar on top or a push bar in the front, no stickers on the sides and just empty mounting brackets where the plates are supposed to be. My friends and I have all seen it around but nobody knows what it's doing...though it kind of makes me nervous to see it idling in the parking lot at 2am. Is it even legal for a car to have no identifying plates at all? What are these guys doing?