As to who investigates allegations of campus sexual misconduct under a school sexual misconduct policy, it will depend on the given college or university in question. Each school will promulgate its own policies as to who would do the investigation. It may be someone from the conduct office, it may be a, say, investigator, it may be campus police. It may be outsourced to a outside law firm. It can vary.
These people hope, obviously, is that they're sufficiently trained in such matters, one cannot always depend on that to be the case. Depending on who investigates the matter, not the state will may be obvious but can have a tremendous impact on the case itself. That's why you need to have an experienced attorney advisor help protect the accused party's interest and rights through the process to make sure that an investigation in a college sexual misconduct case is as fair and appropriate as possible. An experienced attorney advisor should be involved from the start of the process.