This is a simple Cleo created in about ten minutes with limited scripting knowledge.

Cops in the game don't chase other cops for wasting old ladies or running people over. So why would they chase you when you're disguised as a cop?

If you manage to get a cop car without being wanted, you'll be immune from being wanted until after you exit the car.

If you're in a police uniform you will not be wanted at all in any car or on foot. Change clothes to disable this.

I'm not aware of any bugs, except that if you go to police impound they'll shoot at you, but not bust you. I've found no way of changing this.
This script was written with compatibility to other cleo mods in mind.
Let me know of any conflicts.

V1.1
Fixed the creeping cop cars when you're in uniform.
Fixed wanted level coming back(I never experienced this glitch, but it should be gone now)

Let me know if any other bugs pop up...

Enjoy