That's very true. The Veritaserum thing too -- I forgot about that. Ta for that, Carole. But how would you get fingerprints to come up without DNA? Like, in the Muggle world, there would be a database system for fingerprints, so would they have something similar? And in the Muggle world, your fingerprints are only on the system if you commit a crime or whatever (I know there are other reasons but I can't be bothered to list them) so how would it work in the Wizarding world?
EDIT: Gah, Nargles are driving me insane! This post is #3, after my original post with the TQs and Carole's post.