definition of custom as a source of law
Custom (law) Custom in law is the established pattern of behavior that can be objectively verified within a particular social setting. A claim can be carried out in defense of "what has always been done and accepted by law." Related is the idea of prescription; a right enjoyed through long custom rather than positive law.[1]
Common law The doctrine of precedent developed during the 12th and 13th centuries,[73] as the collective judicial decisions that were based in tradition, custom and precedent.[74]
Law of the United States In the United States, the law is derived from five sources: constitutional law, statutory law, treaties, administrative regulations, and the common law (which includes case law).[17]
Religio The Latin term