Ok, Why you
need these models i do not know. Simply pm the creators of original car models and ask if you can reskin them to look like a police car. As for the officer, find pictures of aisan black ect. on yahoo or google and cnp onto the marine model, simple. i could do it for you but it is simple enough for u to do it.
i can understand if u just want these models to make your map look cooler, but no one absolutley needs a model unless there is nothing in
wc3 or on the site that can represent them.
also if u really want a regular cop with a night stick, you can reskin a high elf worker. :)