I think the person to concentrate on is the DC chief of police - and particularly his wife. She is the person who could get the man to do something about it. Especially if she is a mother or grandmother. Unless she is MK'd.

I agree this board can be a bit daunting for newbies. @YingYangMom and @privatepizza have a consolidated thread of the information. The next step is curating the best "evidence for the prosecution."