Offences Outside Canada
Article 6
Genocide etc. committed outside Canada
Interpretation - crimes against humanity
(5) For greater certainty, the offence of crime against humanity was part of customary international law or was criminal according to the general principles of law recognized by the community of nations before the coming into force of either of the following:
(a) the Agreement for the prosecution and punishment of the major war criminals of the European Axis, signed at London on August 8, 1945; and
(b) the Proclamation by the Supreme Commander for the Allied Powers, dated January 19, 1946.
Offences Outside Canada
Article 7
Breach of responsibility by a military commander
Application before coming into force
(5) Where an act or omission constituting an offence under this section occurred before the coming into force of this section, subparagraphs (1)(a)(ii) and (2)(a)(ii) apply to the extent that, at the time and in the place of the act or omission, the act or omission constituted a contravention of customary international law or conventional international law or was criminal according to the general principles of law recognized by the community of nations, whether or not it constituted a contravention of the law in force at the time and in the place of its commission.
Procedures and Defences
Article 10
Proceedings for an offence alleged to have been committed before the coming into force of this section shall be conducted in accordance with the laws of evidence and procedure in force at the time of the proceedings.
Schedule B - Constitution Act, 1982 (79)
PART I - Canadian charter of rights and freedoms
Legal Rights
11. Any person charged with an offence has the right
...
g) not to be found guilty on account of any act or omission unless, at the time of the act or omission, it constituted an offence under Canadian or international law or was criminal according to the general principles of law recognized by the community of nations;
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.