Sometimes in life (more often than you would think) horrible things happen and the police literally do not care. I mean, there is a Dr. who is a suspected serial killer or involved in prostitution killings in and around NY/Long Island, racking up like 15 victims thus far, yet the police want to sweep it under the rug and forget about it because "Who cares about hookers right?".
Weren't most, if not all, of Ted Bundy's victims prostitutes? What is wrong with the NY police, that they're not moving on that case? Are they underfunded, or something?
And corboy had a very good point; this should be reported, because there may be other victims. Your friend could help some other woman out, who files charges. She would be in a position to testify at a trial. But first, she has to heal from her trauma. Please support her in getting competent help.