A legal custom is the established pattern of behavior within a particular social setting. A claim can be carried out in defense of "what has always been done and accepted by law".

Customary law (also, consuetudinary or unofficial law) exists where:
#a certain legal practice is observed and
#the relevant actors consider it to be an opinion of law or necessity (opinio juris).

Most customary laws deal with standards of the community that

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