Louisiana constitution
Article 10
Section 1

(B) City Civil Service. The city civil service is established and includes all persons holding offices and positions of trust or employment in the employ of each city having over four hundred thousand population and in every instrumentality thereof. However, paid firemen and municipal policemen may be excluded if a majority of the electors in the affected city voting at an election held for that purpose approve their exclusion. The election shall be called by the municipal governing authority within one year after the effective date of this constitution.