According to Article 38 of the Statute of the International Court of Justice, the second most significant source of international law is international custom. Specifically the ICJ statute states that the court shall apply international custom as “evidence of a general practice accepted as law”. An international lawyer must prove two basic elements for a particular norm to qualify as customary law:
Virtually all states have signed the following conventions.
General Assembly resolutions, in and of themselves, do not state rules of international law. But, they can result in creating customary international law. Use the following sources to locate resolutions.
Best known resolutions that are in the form of an international agreement are:
Examples of UN General Assembly resolutions that are viewed as customary law are:
To locate judicial opinions that contain a statement that there is a a rule of cutomary international law in effect, consult a well-respected treatise that confirms the statement or consult a database of international opinions.
When using the databases above, possible search terms and strategies include the following:
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