La. Consolidated Public Retirement § 11:928
Any person electing to participate in the optional retirement plan shall always be ineligible for membership in the regular retirement plan of the Teachers' Retirement System of Louisiana even if he is employed in a position covered by the Teachers' Retirement System of Louisiana. If an optional retirement plan participant assumes a position other than as an employee of a public institution of higher education or employee of the Board of Regents, Board of Trustees for State Colleges and Universities, Board of Supervisors of Louisiana State University and Agricultural and Mechanical College, or Board of Supervisors of Southern University and Agricultural and Mechanical College, or their successors, and any other constitutionally established board which manages institutions of higher education in a position covered by the Teachers' Retirement System of Louisiana, he shall continue to participate in the optional retirement plan. If an optional retirement plan participant assumes a position in state service other than as an employee of a public institution of higher education or employee of the Board of Regents, Board of Trustees for State Colleges and Universities, Board of Supervisors of Louisiana State University and Agricultural and Mechanical College, or Board of Supervisors of Southern University and Agricultural and Mechanical College, or their successors, and any other constitutionally established board which manages institutions of higher education in a position not covered by the Teachers' Retirement System of Louisiana, he must at that time begin membership in the appropriate retirement system which provides benefits for that position in state service, other than the Teachers' Retirement System of Louisiana.
La. Consolidated Public Retirement § 11:928