No subpoena or order compelling discovery shall issue to compel the attendance of a member of the Louisiana Legislature, or legislative employee, except in strict conformity with the provision of R.S. 13:3667.1 and no subpoena or order compelling discovery shall issue to compel the attendance of a member or former member of the Louisiana Legislature, or legislative employee, except in strict conformity with the provision of R.S. 13:3667.3. For purposes of this Article, “legislative employee” means the clerk of the House of Representatives, the secretary of the Senate, and employees of the House of Representatives, the Senate, and the Legislative Bureau.