Criminal law has no retroactive to punish past acts and is now used in the km was done in this case is a criminal, then KMS. provisions regarding offences and penalties.
Law not retroactive punishment for past actions, it is km using it in action km criminal in this case the provisions relating to offenses and penalties.
Criminal law is retroactive to death penalty past actions and KM used at the time allow that กม.อาญา here is the provisions set about crime and punishment.