LEOs of NoVa: Is this a fake cop?

Just got a weird vibe from this on the GW this morning. No markings on the side of the doors or any affiliation anywhere on the car, only markings were a US flag sticker on the B pillar and a small POW/MIA sticker on the back, super dark tint job and the light bar looked like it didn’t have any blues/red (but with LEDs now, who knows). Regular Virginia is for Lovers passenger car plates.

He drove right past a three car fender bender on the side of the parkway, although to be fair, a marked Park Police unit with lights and sirens was coming from the opposite direction about a mile up the road.

The whole thing just seemed off. Curious on your thoughts.