ka mən law
noun
law based on custom or usage and on court decisions and opinions, rather than on statute. (Cf. statute law.)
“The Supreme Court, required to determine whether the “necessary implication” of the enactment of the Wage Act was preemption of common law rights, observed that the continued availability of common law remedies did not frustrate or negatively impact enforcement of the Wage Act.” (http://www.lexology.com)