On the other hand, I can understand where you proceed with some formal hearing in terms of a particular employee. Then the person would have access to all the information that was presented.
Suppose you say, well, we hear your complaint about sexual harassment, but we don't think we have enough proof to be able to substantiate it through the hearing process. But you keep that on your file. So the accused would have absolutely no indication that any charges had been levelled against him. Meanwhile, management has on file that he's been accused of sexual harassment but you just couldn't find him guilty.