This book examines the evolution of customary international law (CIL) as a source of international law. Using the International Criminal Tribunal for the former Yugoslavia (ICTY) as a key case study, the book explores the importance of CIL in the development of international criminal law and focuses on the ways in which international criminal tribunals can be said to change the ways in which CIL is formed and identified. In doing so, the book surveys the process and substance of CIL, as well as the problematic distinction between the elements of state practice and opinio juris. By applying an inclusive positivist approach, Noora Arajärvi analyses the methodologies of identification of CIL in selected cases of the ICTY, and their normative foundations. Through examination of the case-law and the reasoning of courts and tribunals, Arajärvi demonstrates to what extent the court's chosen method of identification of CIL affects the process of custom formation and the resulting system of norms in general. The book will be of great value to researchers and scholars of international law, international relations, and practitioners with interests in customary international law.

In the past decades, great strides have been made to ensure that crimes against humanity and state-sponsored organized violence are not committed with impunity. Alongside states, large international organizations such as the United Nations and forums such as the International Criminal Court, 'de facto international prosecutors' have emerged to address these crimes. Acting as investigators and evidence-gathers to identify individuals and officials engaged in serious human rights violations, these 'private' non-state actors, and state legal 'officials' in a foreign court, pursue criminal accountability for those most responsible for core international crimes. They do so when local options to investigate fail and an international criminal tribunal remains unavailable. This study outlines three case studies of witnesses and victims who pursue those most responsible, including former heads of state. It examines their practices and strategies, and shows how witnesses and victims of core crimes emerge as key leaders in the accountability process.

Customary international law remains a central source of international law and the core of the international legal system. It continues to draw the attention of lawyers, especially at a time marked by the great expansion of international law and its increasing application in domestic and international courts. Determining whether an applicable rule of customary international law exists is therefore of great practical concern - but this important legal task is not always simple or straightforward. This book serves as guidance to those seeking to determine the existence of rules of customary international law and their content. It elaborates on the methodology for the identification of rules of customary international law and examines a host of questions concerning the process and evidence at issue. It does so by complementing the authoritative work of the UN International Law Commission on this topic, and by drawing upon a wealth of additional practice and writings. Identification of Customary International Law provides an overview of the Commission's work and expands on it by addressing the nature and history of custom as a source of international law, inquiring into each of the two constituent elements of customary international law (namely, a general practice and opinio juris), explaining the value and limits of certain forms of evidence, and throwing further light on such issues as the persistent objector rule and particular customary international law. Practitioners and scholars alike will find this detailed treatment useful in seeking to determine the existence and content of any customary rule and in ensuring that arguments about customary international law are persuasive.

Customary international law is one of the principal sources of public international law. Although its existence is uncontroversial, until now the content of customary international law in the area of human rights has not been analyzed in a comprehensive manner. This book, from one of international law's foremost scholars and practitioners, provides an unparalleled account of the customary international law of human rights. It discusses the emergence of this customary law, the debates about how it is to be identified, and the efforts at formulation of customary norms. In doing so, the book provides a useful and accessible introduction to the content of international human rights. The author uses the Universal Declaration of Human Rights as a basis to examine human rights norms, and determine whether they may be described as customary. He makes use of relatively new sources of evidence of the two elements for the identification of custom: State practice and opinio juris. In particular, the book draws on the increasingly universal ratification of major human rights treaties and the materials generated by the Universal Periodic Review mechanism of the Human Rights Council. The book concludes that a large number of human rights norms may indeed be described as customary in nature, and that courts should make greater use of custom as a source of international law.

Patrick Dumberry provides a comprehensive analysis of the rules of customary international law in the field of international investment law.

In The Rome Statute as Evidence of Customary International Law, Yudan Tan offers a detailed analysis of topical issues concerning the Rome Statute of the International Criminal Court as evidence of customary international law.

Provides an in-depth study of the theory, history, practice, and interpretation of customary international law.

Customary international law is the most important source of international criminal law. Fifty years after the Nuremberg trials, many convictions imposed by the tribunals for the former Yugoslavia and Rwanda are still based on customary international law alone. The International Criminal Court, by contrast, has not yet had much opportunity to give more guidance on this matter. Hence, it is worthwhile to provide an overview of the current status of custom by analysing the ad hoc tribunal’s case law on this point. Including a comprehensive synopsis of current literature and a contrast of the ad hoc tribunal’s case law with the jurisprudence of the International Court of Justice, this book offers an inclusive insight into the source’s past and future.

Reexamining Customary International Law takes on the complex issues and controversies surrounding the history, theory, and practice of customary international law as it reexamines customary law's increasingly important role in world affairs. It incorporates the expertise of distinguished authors to probe many difficult issues that remain unresolved concerning the doctrine of customary law. At the same time, this book engages in a profound exploration of the practical role of customary international law in a variety of important fields, including humanitarian law, human rights law, and air and space law.

In three distinct volumes the editors bring together a distinguished group of contributors whose essays chart the history, practice, and future of international humanitarian law. At a time when the war crimes of recent decades are being examined in the International Criminal Tribunals for Former Yugoslavia and Rwanda and a new International Criminal Court is being created as a permanent venue to try such crimes, the role of international humanitarian law is seminal to the functioning of such attempts to establish a just world order. The intent of these volumes is to help to inform where humanitarian law had its origins, how it has been shaped by world events, and why it can be employed to serve the future. The other volumes in this set are International Humanitarian Law: Origins and International Humanitarian Law: Challenges Published under the Transnational Publishers imprint.