Going around the Somerville circle. He cut across 2 lanes of traffic with no lights on had his window down and got 13RPMS screamed in his ear. I just shook my head at him and he went on driving never even looking at me in his mirror when I followed (was going the same direction) him for 3 miles. Just be careful just because they are cops does not mean they know how to drive or care how they drive for that matter.