AZ Highway Patrol uses marked units on the highways and freeways, augmented by 'stealth' units - same as the regular marked units in solid black or charcoal or silver with nearly invisible markings (they show up reflective at night). But their real big play on aggressive drivers is a small collection of unmarked cars - a bright yellow Mustang, and Chargers in bright blue, fire-engine red, emerald green, and black. Sneeeeky. And, then, of course some super fast bikes. Almost forgot: they also run some unmarked F150 pickups in silver, black, charcoal, or white.
Gotta stay on yur toes around here.