Yes, ex-police cars can be bought. However, they tend to be of the "rode hard and put away wet" variety. Here in Kansas, used highway patrol cars are often handed down to the county and city police, where they rack up many hard miles. The mileage doesn't tell you how many hours the car sat idling. One financing application I saw even required the dealer to certify that the vehicle had never been a police car or taxi cab. The finance company wasn't interested in using them for collateral at any price.