I find it scary to think they might just be going on two womens stories.
Imagine if in the two girls were just really hurt that he didn't "marry" either of them, and have plotted together to ruin this guys life, and in fact they were 18 when he slept with them as his story says. It's his story versus theirs.
Nothing worse than a woman scorned and it's been known to happen.
I'm sure the police must have more evidence though. Must be more than meets the eye.