Fairfax has a shit load of undercover vehicles that you wouldn't even know they were cops unless you saw them pull someone over. The only way to tell on most is lights behind the grille (sometimes hard to see). We get so many Suburbans, Tahoes, Expeditions, and of course, Impalas in here at work that you can't tell. There's nothing on the ouside except maybe 1 antenna. Definatly pay attention to what's behind you in Fairfax.