When I was a kid, cop cars were brightly marked and clearly identified. Now the trend seems to be black vehicles with dim markings. This is just their overt admission that they are road pirates on the prowl instead of peace officers out to protect the citizenry. Coproaches like the dark.
When I first started driving, I usually slowed down when I saw a white vehicle coming my way, just in case. But now I notice the vehicles around here are combination black and white. I haven’t seen one like in your picture but man they are getting sneaky!
The small town where I live has one similar to this. As police departments rotate into new vehicles, expect to see more with these subdued markings.
Now it's "To frame and maim.."
Always has been. They are just less subtle now.