La. R.S. 33:1406

At the time of their designation emergency interim successors shall take such oath as may be required for them to exercise the powers and discharge the duties of the office to which they succeed. Notwithstanding any other provisions of law, no person, as a prerequisite to the exercise of the powers or discharge the duties of an office to which he succeeds, shall be required to comply with any other provision of law relative to taking office.