Your first impulse may have been to deny that this happens. Ask yourself, have you asked and then truly listened to your female friends and colleagues if they have ever experienced this before? Please make the effort and gather some anecdata.
I don't wish to dismiss this as not happening, but if this is true than it should get more attention. I mean, I've heard about some of the unwanted attention and comments women get, and some are quite frightening, but how does this relate to the number of women who attend cons regularly, wear revealing clothing, etc etc, year after year, and don't seem to hAve experienced attacks like this, to this degree and w without authorities taking notice?
Sometimes the kits are not tested because both people agree that sex happens, but they disagree on consent.
But if police don't care about actual rape why do you think they'll do anything about sexual assault or harassment?
Try it out!