La. Stat. tit. 37 § 2847
Each polygraphist's certificate shall be issued for the term ending December 31, and shall, unless suspended or revoked, be renewed annually as prescribed by the board. A polygraphist whose certificate has expired may at any time within six months after the expiration thereof obtain a renewal certificate without examination by making a renewal application therefor and satisfying R.S. 37:2838(1). Any polygraphist whose certificate expired while he was in the federal service, on active duty with the armed forces of the United States or the national guard called into service or training, or in training or education under the supervision of the United States preliminary to induction into the military service, may have his certificate renewed without examination if within six months after termination of such service, training, or education except under conditions other than honorable, he furnishes the board with an affidavit verifying that he has been so engaged, and that his service, training, or education has been so terminated. R.S. 37:2838(1) must also be satisfied.
La. R.S. § 37:2847