I remember reading that many universities don't require proof. It's simply judged by a panel and if they decide that the likelihood of the crime had occurred is greater than 50% then that's all they need.
My school enacted this ridiculous policy too (but only for the gym locker room bathroom stalls) Yeah, good like using the toilet when EVERYONE can see you.
I get their reasoning behind it. "Dad works so hard all year long, we should give him this day to sit back and be lazy!" but it comes off as insulting as all hell.
No, on the tape when they get out, one of them says to someone in the house "Call the cops, this [censored] just tried to molest us!" So, they did commit defamation.