But these are based on certain standards to prevent abuses by one of the parties. You just happen to want to apply standards in criminal proceedings to non-criminal proceedings.Just because it's a voluntary agreement doesn't mean shouldn't be bound to certain standards in order to prevent abuses by one of the parties in the agreement.
If we're talking about a crime then that's exactly what I want to do. The issue that the university is facing is that one of its students broke the rules from the code of conduct by engaging in criminal behavior. If they can't demonstrate a crime then, by definition, they didn't break a rule.
Now, given that the consequences aren't as serious, the standards of evidence don't need to be as serious and there's no problem with going with something like a preponderance of evidence standard instead of the beyond reasonable doubt standard. However, to get to that standard, you need to do things properly. Having some dude with eight hours of training looking into it does not rise to that level. If the guy investigating the crime couldn't get work as a private investigator, they have no business collecting evidence of a crime. If the people reviewing his report are similarly inexperienced, their review of the report adds no value.
Now, Nice Squirrel's policy there is, of course, a long shot better than the situation talked about in the OP. It is still, however, completely inadequate in determining whether or not a given student has violated the code of conduct for the university.