La. Stat. tit. 37 § 2106
On January 15, 1955, and thereafter any person, before practicing as a sanitarian, except those who have already received licenses and whose licenses may be renewed, shall present to the board of examiners as herein constituted, his or her qualifications, and shall stand a written and oral examination before the board. The board created under this Chapter shall be the sole judge as to the sufficiency of qualifications of any individual applying for a license. If an applicant's qualifications and results of examination be accepted as satisfactory by the board of examiners, the board shall issue to such person a license to practice as a sanitarian in the state of Louisiana. The board, however, may by rule provide for the licensing without examination of sanitarians holding licenses issued under the laws of other states, and also by rule may provide for the issuance of temporary licenses pending the giving of an examination to applicants who appear to have the necessary qualifications.
La. R.S. § 37:2106