Talk:Through a Glass, Darkly/@comment-25132765-20150102130954/@comment-25312059-20150102135831

Did no one watch 4x18? They explained it clearly. 'A' swapped Alison and Bethany's dental records so that when they used them to identify "Alison" they matched. It's happened in real life and in other TV shows and novels. When Spencer looks up Bethany Young in 5x06 it also says in an article that the police believe somebody tampered with the dental records.