Gee...the only time I was in the back of a cop car, I wasn't thinking too much about my personal comfort. Anyway, fast-forward 15 years, and I have a few cop friends that would probably be willing to do a short race with their Crown Vics. Unfortunately, I only have a GT, but if anyone wants to let me borrow their GTP or G8, I'm sure I could arrange something.
Sadly, my Uncle's squad car is directly across the street almost every night, but he's very "by-the-book".