Jake01 is quite right - I had missed this 1974 Ford Torino in 'Follow That Still' (see footnote of this post). It's meant to be an ATF car, but the badge on the door doesn't look anything like the ATF logos I could find on Google. While I was looking up the ATF logos it reminded me of a sketch by Sacha Baron Cohen aka. Borat, Brüno, Frenchy in 'Talladega Nights'. In the sketch he visits the ATF as another alter ego, Ali G. The questioning goes something like "So what does ATF stand for?", "Alcohol, Tobacco, Firearms and Explosives", "And what else does you sell?". You can see the sketch
- just remember that the ATF guys are expecting a serious interview.
If I can drag myself off that tangent and back to the case in hand, this US Marshal's car appears right at the end of 'Trouble at Cooter's'. This is all we get to see of it, but going by the tail lights it appears to be a 1978 Pontiac Catalina. For some reason the badges on the uniform and on the car door (see insets) both spell Marshal as "Marshall". Does anyone know of a reason for this, or is the guy moonlighting as an amplifier salesman?. Neither of the badges is an authentic US Marshals' badge.
Back to regular patrol cars now, and I believe that 'Goodbye General Lee' mark's the first appearance of a 1977/78 Plymouth Fury in the Hazzard Sheriff's livery - I'm sure someone will tell me if I'm mistaken. They swap around a bit because the Dodge Monacos are back for 'Hughie Hogg Strikes Again'.
Lastly for this post is another ATF car. This one appears in 'Hughie Hogg Strikes Again'. For this episode the car is a 1973 Plymouth Fury and the badges (as best I can see) are similar to the real ATF logo. I'm sorry that the image is a little blurry but the only time the car is seen stationary is after it flips over - maybe that's why they used an older car.
Originally this thread was just going to be for police vehicles, but I've expanded my remit to include other non-civilian cars. Some of these are easy to miss (as Jake01 discovered) because they only appear very briefly, so if I leave any out as I go through the seasons I hope y'all will be sure to tell me. I suppose under the new criteria I should have included the President's Limo. I could go back to get a picture if y'all feel it belongs here.