He's a serial rapist: aren't there other victims? How can a serial rapist be convicted based on her testimony alone? - Someone already brought these thigns up and I think they're good point. They don't seem to have a very solid case against him if the only person is a flighty underaged runaway who - though being underaged - doesn't have a compelling foster care family to stay with.
maybe they need to find her a gaurdian and a home instead.