Buffalo Police use Liberty Taxi unmarked cars.
Saw it with my own eyes tonight. 2 BPD officers in a Liberty Taxi Crown Vic (Dark Blue in Color) equipted with undercover flashing lights, pulled over a speeder on Niagara Street. Very sneaky and a great idea. I thought this was a Buffalo original as I had not heard of it before, but my friend "unlisted" showed me a video of a NYC undercover taxi.