Immunity of Heads of State and Senior State Officials from Subpoenas and Witness Summonses

Abstract

Although the law on immunities under international law is a very rich field of study, not much analysis has been done on the immunities of Heads of State from acts other than prosecution, namely from witness summonses and subpoenas in international criminal law. This article poses the question whether international law allows for Heads of State and Senior State officials to be subpoenaed or summonsed to testify as witnesses, and seeks to answer it by systemizing the relevant case law of international criminal courts and tribunals. After defining the types and the application of subpoenas and witness summonses in international criminal proceedings, the article examines whether the immunity of Heads of State is upheld when such requests are filed before international and national courts. The case law of the ad hoc international criminal tribunals shows that when the tribunal had to adjudicate a request to compel a witness to appear, it adapted the legal standard by considering the type and the object of the subpoena, the status of the prospective witness, and the court’s role and mandate. The International Criminal Court iterated its power to compel the appearance of witnesses. As the immunities that are attached to the office of Heads of State and Senior State officials are largely sourced in rules of customary international law, the article maps the content of the customary rule governing specifically the immunity from subpoenas and witness summonses in international criminal law.