State Practice as Element of Customary International Law: A White Knight in International Criminal Law?

Inter-state practice is relatively scarce in the area of human rights and international criminal law. This article ventures to inquire how this has affected the process of identification of customary international law by international criminal tribunals and courts. The main conclusion is that the two components of customary international law – opinio juris and state practice – have become blurred. In search of customary international law, international tribunals have resorted to national legislation and case law of domestic courts. These legal artefacts can be qualified as both evidence of state practice and opinio juris. The author attempts to explain the reasons for this development and holds that, if properly applied, the methodology, while seemingly messy, comports with the nature of international criminal law.