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CHAPTER II PROTECTION OF FUNDAMENTAL HUMAN RICHTS FREEDOMS
12. Right to fair trial, etc.
(4) No person shall be held to be guilty of a criminal offence on account of any act or omission that did not, at the time it took place, constitute such an offence, and no penalty shall be imposed for a criminal offence that is severer in degree or description than the maximum penalty that might have been imposed for that offence at the time when it was committed.
Article 22
Nullum crimen sine lege
1. A person shall not be criminally responsible under this Statute unless the conduct in question constitutes, at the time it takes place, a crime within the jurisdiction of the Court.
2. The definition of a crime shall be strictly construed and shall not be extended by analogy. In case of ambiguity, the definition shall be interpreted in favour of the person being investigated, prosecuted or convicted.
3. This article shall not affect the characterization of any conduct as criminal under international law independently of this Statute.