CHAPTER 5. FUNDAMENTAL HUMAN RIGHTS AND FREEDOMS
Part I. General
19. FAIR TRIAL
(5) A person shall not be charged with or held to be guilty of a criminal offence which is founded on an act or omission that did not at the time it took place constitute an offence.
(6) No penalty shall be imposed for a criminal offence that is severer in degree or description than the maximum penalty that could have been imposed for that offence at the time when it was committed.
CHAPTER 10. THE LEGISLATURE
Part II. Procedure in Parliament
107. RETROACTIVE LEGISLATION
Parliament shall have no power to pass any law-
b. which operates retrospectively to impose any limitations on, or to adversely affect the personal rights and liberties of any person or to impose a burden, obligation or liability on any person except in the case of a law enacted under articles 178 to 182 of this Constitution.
2. If a State becomes a Party to this Statute after its entry into force, the Court may exercise its jurisdiction only with respect to crimes committed after the entry into force of this Statute for that State, unless that State has made a declaration under article 12, paragraph 3.
1. No person shall be criminally responsible under this Statute for conduct prior to the entry into force of the Statute.
2. In the event of a change in the law applicable to a given case prior to a final judgement, the law more favourable to the person being investigated, prosecuted or convicted shall apply.