Constitution of the Slovak Republic

Country
Slovakia

Article 49 Only the law shall lay down which conduct constitutes a criminal act, and what punishment, or other forms of deprivation of rights, or property, may be imposed for its commitment. Article 50 (...) (6) Whether any act is criminal is assessed, and punishment is determined, in accordance with the law valid at the time when the act was committed. A more recent law is applied, if it is more favorable for the perpetrator.