As an asside you went way overboard in chasing him. You should have just gotten his plate and filed the report when he refused to stop. You placed yourself in danger and compounded it by endangering every one on the same roads with you by chasing him. Poor choice on your part.
Skipped over a few posts to put this in. It seems to me that you antogonized the situation. Not saying that you were at fault, but you handled it bad. In hindsight, that fediddleer could have gone apechit and popped a few at you, cop or not.
That being said, I have some family members that are in the police force, some retired, some not. It's a rough gig. There's a comraderie there not unlike that found in the military. I hope that guy is repremanded, officially or not. The threat to the public is exponentionaly greater when presented by an officer, and this guy needs a breather.
Again in hindsight, it might have been better to report his plate to your friends, and let them handle the situation. You didn't know he was a cop until he told you. They would have known as soon as they ran his plates. From what I gather from the family members that are in there, the internal, unofficial consequences are worse than the official ones.
And BTW, chill out on the road. It's only metal and it aint worth the time and heartache.
MT