Chapter Two : Fundamental Rights and Duties of Citizens

Article Twenty-Seven

No deed shall be considered a crime unless ruled by a law promulgated prior to commitment of the offense. No one shall be pursued, arrested, or detained without due process of law. No one shall be punished without the decision of an authoritative court taken in accordance with the provisions of the law, promulgated prior to commitment of the offense.

Article 11
Jurisdiction ratione temporis
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.

Article 24
Non-retroactivity ratione personae
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.