La. Stat. tit. 33 § 2400
The director shall recommend to the commission rules necessary or desirable for carrying out the provisions of this Part, and may, from time to time, recommend amendments or additions thereto. When such rules or amendments are recommended by the director, the commission shall hold public hearing thereon, and may approve, alter, amend, or reject the recommendations of the director wholly or in part or modify them and approve them as so modified. The first rules hereunder shall be recommended by the director within six months after his appointment. The commission may propose and adopt new rules or amendments or additions to the rules on its own initiative.
Rules adopted under this Section shall have the force and effect of law. Among other things, the rules shall provide for the method of administering the classification plan and the pay plan; the establishment, maintenance, consolidation, and cancellation of lists; the application of service ratings; the hours of work, attendance regulation, vacations, and leaves of absence for employees in the classified service; and the order and manner in which lay-offs shall be effected. Such rules may include any provisions relating to city employment which are necessary or appropriate to give effect to the provisions and purposes of this Part.
The powers herein conferred upon the director shall be subject to the provisions of this Part, and the pertinent provisions of the legislative charter of the city, and of the rules adopted hereunder, and may be exercised by regulation or by order as the director sees fit. His powers and duties shall not be limited or restricted by the authorization to adopt rules, except to the extent that rules are adopted hereunder.
La. R.S. § 33:2400