A legal practitioner in Lagos is researching the legislative powers of the National Assembly and the State Houses of Assembly in Nigeria. She discovers that a State House of Assembly has enacted a law on a matter listed in the Concurrent Legislative List. The National Assembly subsequently enacts a federal law on the same matter, and the two laws are inconsistent. What is the legal effect of this inconsistency under the 1999 Constitution?

Section 4(5) of the Constitution of the Federal Republic of Nigeria 1999 (as amended) provides that if any law enacted by a House of Assembly is inconsistent with any law validly made by the National Assembly, the law made by the National Assembly shall prevail and the State law shall be void to the extent of its inconsistency. This principle applies specifically to matters on the Concurrent Legislative List where both the National Assembly and State Houses of Assembly have competence to legislate. The federal law's temporal sequence relative to the State law is irrelevant; federal supremacy on concurrent matters is absolute upon enactment.