Customary international humanitarian law

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Customary international humanitarian law is a body of unwritten rules of public international law, which govern conduct during armed conflict.

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Customary international law

Customary international law, like international treaty law, is recognized as a primary source of public international law. While international treaties are written agreements by which States establish certain rules, customary international law consists of unwritten rules which derive from “general practice accepted as law”. [1] Therefore, for a rule of international custom to be established, two elements are required: “an objective one, the repeated behaviour of States ... and a subjective one, the belief that such behaviour depends on a legal obligation ( opinio juris sive necessitatis )”. [2] The objective element is also often referred to as State practice; the subjective element as opinio juris.

International humanitarian law

International humanitarian law (IHL), also known as the law of war or the law of armed conflict, is the area of public international law which aims, “for humanitarian reasons, to limit the effects of armed conflict. It protects persons who are not or are no longer participating in the hostilities and restricts the means and methods of warfare”. [3]

War is as old as mankind and so, in a sense, is IHL. Behaviour during armed conflict “has always been subject to certain principles and customs”, based on the practices of armies around the world. [3] Since the mid-19th century, however, many such rules have been codified by States in international treaties, like the Hague Regulations and Geneva Conventions. [4] Not withstanding this increasing codification of IHL, customary rules remain relevant in contemporary armed conflicts.

Current relevance

Customary international humanitarian law complements the protection provided by international humanitarian treaty law in situations of armed conflict. International treaty law only binds States which are party to a particular treaty; customary international law, on the other hand, is, in general, binding on all States. And while some international humanitarian law treaties, such as the 1949 Geneva Conventions, are today universally ratified, this is not the case for all treaties. [4] Here, customary international humanitarian law can be used to fill gaps in the protection provided in situations of armed conflict.

Furthermore, many of today's armed conflicts do not take place between States but are of a non-international character. International humanitarian treaty law, however, while highly detailed as regards international armed conflicts, is considerably less developed in relation to non-international armed conflicts. Here, again, customary international humanitarian law provides further rules which are not stated in conventions.

In 2005, mandated by the States convened at the 26th International Conference of the Red Cross and Red Crescent, and after nearly 10 years of research and consultation, the International Committee of the Red Cross (ICRC) presented a Study on Customary International Humanitarian Law, published by Cambridge University Press. [5] Volume I of the study contains 161 rules assessed by the authors of the Study to be of customary status, most of them applicable in both international and non-international armed conflicts. Volume II presents the practice which forms the basis of the conclusions in Volume I.

Since August 2010, an online version of the Study, the ICRC's Customary IHL Database, is also available. Part One of the database reflects Volume I of the print edition of the study. Part Two, based on Volume II of the print edition, presents what the authors believe is state practice relating to most aspects of IHL, purportedly expressed in national legislation, military manuals, official statements, and case-law, and the practice of other entities such as international organizations and international courts and tribunals. Part Two is updated regularly through a joint project of the ICRC and the British Red Cross Society, based at the Lauterpacht Centre for International Law, University of Cambridge.

This Study has been the subject of serious criticism, in light of controversial ways used for identifying customary humanitarian law. One criticism has been that "Although the Study’s introduction describes what is generally an appropriate approach to assessing State practice, the Study frequently fails to apply this approach in a rigorous way," and that "the Study tends to merge the practice and opinio juris requirements into a single test." [6] Professor Yoram Dinstein was very critical of the Study. He wrote that "as regards international armed conflicts, the Study clearly suffers from an unrealistic desire to show that controversial provisions of API are declaratory of customary international law... By overreaching, I think that the Study has failed its primary mission." [7]

ICRC's customary international humanitarian law database

A database of International Committee of the Red Cross' Customary IHL Study, developed in association with the British Red Cross, was launched by the International Committee of the Red Cross in August 2011. [8] It is designed to be used as a legal reference in international and non-international armed conflicts, including by courts, tribunals and international organizations. [9]

The database is updated on a regular basis. A selection of national practice of 30 countries was added in March 2011 followed by an additional 27 countries in November of the same year. On 13 December 2012, the ICRC made available its updated collection and analysis of what it considers practice from 23 countries [10] – Argentina, Bangladesh, Belgium, Bosnia and Herzegovina, Burundi, Chad, Chile, Colombia, Croatia, Djibouti, El Salvador, Guatemala, the Islamic Republic of Iran, Japan, Mexico, Peru, Serbia, Serbia and Montenegro, Senegal, Spain, Switzerland, Uruguay, and Viet Nam.

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References

  1. ↑ Article 38(1)(b), Statute of the International Court of Justice
  2. ↑ Tullio Treves, ‘Customary International Law’, in R. Wolfrum (Ed.), The Max Planck Encyclopedia of Public International Law (online edition), Oxford University Press, 2008.
  3. 1 2 ICRC, What is International Humanitarian Law, Legal Fact Sheet.
  4. 1 2 ICRC, International Humanitarian Law – Treaties & documents.
  5. ↑ J.-M. Henckaerts and L. Doswald-Beck (eds.), Customary International Humanitarian Law, 2 Volumes, Volume I: Rules, Volume II: Practice (Cambridge University Press & ICRC, 2005).
  6. ↑ Bellinger, John B. III; Haynes, William J. II (June 2007). "A US government response to the International Committee of the Red Cross study Customary International Humanitarian Law" (PDF). International Review of the Red Cross. 89: 444, 446.
  7. ↑ Dinstein, Yoram (2006). "The ICRC Customary International Law Study". International Law Studies. 82: 110.
  8. ↑ Customary Law database from the International Committee of the Red Cross and Red Crescent
  9. ↑ New legal database launched to enhance protection for war victims from the International Committee of the Red Cross and Red Crescent
  10. ↑ "ICRC database on customary international humanitarian law: new update of State practice - ICRC". www.icrc.org. 2012-12-11. Retrieved 2019-06-07.
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