Prof. Kenneth S. Gallant – No Ex Post Facto Criminal Laws: Legality and its Meaning for Comparative and International Law
Juridicum Schottenbastei 10, WienThe non-retroactivity of crimes and punishments has become a rule of customary international law. How it did so is an interesting and complex story about the use of comparative law in the making of international law. This rule of international human rights law can be demonstrated as rigorously from practice and opinio juris as any other rule of customary international law. It is sometimes said that less evidence of state practice is necessary to treat an international human right as customary international law. Rules of human rights law, however, are far safer and more secure if grounded in practice as well as opinio juris. Legality is an excellent tool for making such a demonstration of technique in human rights law....