Are there rules about investigation? In general, if someone makes a claim, it invites testing. The consent forms are likely friends, so calling to ask question

Are there rules about investigation? In general, if someone makes a claim, it invites testing. The consent forms are likely friends, so calling to ask questions about the experience should give you an idea of what to believe. The outcome can be your decision. Meet with the student and tell them their degree is in jeopardy and use it as a teaching lesson, or prove to them that they can get away with believable lies as long as no one has the courage to catch them. Your colleagues should have some insights, as well.