La. Const. art. X, § 15

Nothing in this Part shall prevent the establishment by the legislature, or by the respective parish governing authority, of a parish civil service system in one or more parishes, applicable to any or all parish employees, except teaching and professional staffs and administrative officers of schools, or the establishment by the legislature or by the respective municipal governing authority of a municipal civil service system in one or more municipalities having a population of less than four hundred thousand, in any manner now or hereafter provided by law. However, paid firemen and paid municipal policemen in a municipality operating a regularly paid fire and police department and having a population exceeding thirteen thousand, and paid firemen in all parishes and in fire protection districts, are expressly excluded from such a civil service system.

Nothing in this Part shall permit inclusion in the local civil service of officials and employees listed in Section 2 of this Article.

No law enacted after the effective date of this constitution establishing a civil service system applicable to one or more parishes or to one or more municipalities having a population of less than four hundred thousand shall be effective in any parish or in any municipality until approved by ordinance adopted by the governing authority of the parish or municipality.