Iranian Legal system The principle of legality of crimes and punishments (nullum crimen, nulla poena sine lege) states that an act is not regarded a crime and does not warrant punishment unless the legislator first determines and publishes the criminal title and penalty. Individual security is protected by the legality principle, which ensures basic individual liberties against the state's arbitrary and unlawful intervention. As a result, a criminal court cannot declare an individual's actions to be crimes and assign punishments to them, or impose punishments that are not authorised by the Legislator and are not based on the wording of the law. It is not considered a criminal whether an act is morally rebuked or socially against the public order, and the Legislator is the only authority who may identify such actions as crimes. The Constitution and regular legislation of Iran's legal system, both before and after the Islamic Revolution, have clearly highlighted