Customary international law

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Customary international law consists of international legal obligations arising from established or usual international practices, which are less formal customary expectations of behavior often unwritten as opposed to formal written treaties or conventions. Along with general principles of law and treaties, custom is considered by the International Court of Justice, jurists, the United Nations, and its member states to be among the primary sources of international law. A wide variety of international legal rules originate as a matter of customary international law including, for example, immunity of visiting foreign heads of state and the principle of non-refoulement. States can be bound by customary international law, regardless of whether the states have codified these laws domestically or through treaties. Some customary international laws rise to the level of jus cogens (no exceptions) through acceptance by the international community as non-derogable rights, while other customary...

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