 4th.Every law that alters the legal rules of evidence, and receives less, or different, testimony, than the law required at the time of the commission of the offence, in order to convict the offender.The decision restates this categorization later as laws "that "create", or "aggregate", the "crime"; or encrease the punishment, or change the rules of evidence, "for the purpose of conviction"" [emphasis in the original].