La. R.S. 47:2309

This Act shall become effective upon signature by the governor, or, if not signed by the governor, upon the expiration of the time for bills to become law without signature by the governor. Notwithstanding the effective date stated herein, the provisions of this Act shall be effective only to the extent necessary under the provisions of Section 23 of Article VII of the constitution of Louisiana. In no event shall these provisions apply to ad valorem taxes levied for the taxable years 1976 and 1977.