La. Roads, Bridges and Ferries § 48:864
The governing authority of the parish shall determine the form of the bonds, including any interest coupons to be attached thereto, and shall fix the denominations of the bonds and the place or places of payment of principal and interest thereof, which may be at any bank or trust company within or without the state. The bonds and any interest coupons attached thereto shall be executed in the manner determined by the governing authority of the parish. If any officer whose signature appears on the bonds or coupons ceases to be such an officer before the delivery of the bonds, his signature shall nevertheless be valid and sufficient for all purposes in the same manner as if he had remained in office until delivery.
La. Roads, Bridges and Ferries § 48:864