It may make the punishment prescribed for a crime, more severe. It may also add new penalties or it may extend a sentence. It may change the rules of evidence in order to make conviction for a crime likelier than it would have been when the deed was committed. , a form of "ex post facto" law, commonly called an "amnesty law", may certain acts. A pardon has a similar effect in a specific case. Other legal changes may lessen or eliminate possible punishments (for example by replacing the death sentence with lifelong imprisonment) ly. Such legal changes are also known by the Latin term in mitius.