So its a ford interceptor, it has a damage model and its color changeable. I think the LA police logo is on it.
http://www.gamemodding.net/en/gta-san-andreas/gta-sa-cars/50260-lapd-ford-crown-victoria.html
http://www.gamemodding.net/en/gta-san-andreas/gta-sa-cars/50260-lapd-ford-crown-victoria.html