La. Stat. tit. 38 § 13
The director shall cause to be designated, and shall prescribe, a definite plan or organization and procedure of the department with a view to the most effective conduct of the work of the department. The plan shall include such elements as unified and systematic procedure, definite allocation of functions to the divisions and other component parts of the department, proper housing and layout of quarters to facilitate the carrying out and supervision of the work in process, effective routing and flow of work and coordination of staff efforts in carrying out the procedures prescribed. The director shall cause standard practice instructions to be prepared for the guidance of all concerned in the operation of the prescribed plan and the system of procedures based on it and for putting the prescribed procedures into effect and fitting them to the plan of organization established in accordance with law.
La. R.S. § 38:13