Proving a student took a test, if there is no signature I am interested, how can a student prove he is the author of a test, if he forgot to sign it or only a name or ID is provided and not both?
May depend on nation or university, but they cannot if both miss. In the case of only one missing there is no need to prove, unless the course has multiple people with a same name, and the both would have forgotten. It is a policy that it would be too much of a pain to find eye witnesses and make hand writing analysis in such a case.