PART TWO--FUNDAMENTAL HUMAN RIGHTS AND FREEDOMS
CHAPTER II--PERSONAL RIGHTS AND FREEDOMS
Article 29
1. No one may be accused or declared guilty of a criminal offense that was not provided for by law at the time of its commission, with the exception of offenses, which at the time of their commission constituted war crimes or crimes against humanity according to international law
Non-retroactivity
Nullum crimen sine lege
EDIT.