The Harvard Law student who, in an effort to explain why he failed to stop for Boston police, proclaimed to the officers, "regular police can’t stop us on the highway," revealed a truth about himself and so many other neophytes in the professions: at that stage of your career, asses can be hard to tell from elbows. (HT:UH.)
When I was a Trooper, I often heard a variant of the canard from local motorists. Something like, "You can't stop me here; this isn't a state road." Wrong again.
In case anyone's still wondering, in Massachusetts a police officer with chapter 90 authority (authority to enforce motor vehicle law) can stop you on any public road in his jurisdiction. If you try to get away, he can keep trying to stop you, even outside his jurisdiction. And a state police officer can stop you anywhere and enforce any state law - even the ones that don't have anything to do with motor vehicles.
So here's Carpundit's tip of the day: when you see the blue lights flashing, pull safely to the right shoulder and come to a complete stop. In the words of Chris Rock, If the police have to come and get you, they're bringing an ass kicking with them.