I found a mod that works but I cant use it on police cars could someone edit the asi file and change it ? http://www.gtagarage.com/mods/show.php?id=13991
If your car gets destroyed or no car is in distance it would be nice to enter a police car used by AI, for example to follow the criminal. At the moment you try to steal the car instead of joining them.
It would be nice if someone could add this feature.