Louisiana Revised Statutes Tit. 14, § 97.2. Unlawful sale, purchase, possession, or use of traffic signal preemption devices

(1) The owner or operator of an emergency service vehicle for use in providing emergency services, including but not limited to law enforcement vehicles, fire-fighting vehicles, emergency medical service vehicles, or ambulance vehicles;

(2) The owner or operator of a department of transportation, city, or parish maintenance vehicle for use in performing traffic control signal tests or maintenance;

(3) The owner or operator of a public transit vehicle for use in providing transit service; or

(4) An employee or agent of a traffic control signal preemption device manufacturer or retailer in the course of his employment in providing, selling, manufacturing, or transporting a traffic control signal preemption device to an individual, entity, or agency listed in this Subsection.