No teacher, school bus operator, school lunch worker, janitor or other school personnel shall be employed by any educational cooperative established pursuant to R.S. 17:2801 through 2828 at a salary or wage which is either less than or in excess of any minimum salary schedule or law heretofore adopted by the legislature to govern the salaries or wages of any school teachers, school bus operators, school lunch workers, janitors or any other school personnel.
La. R.S. § 17:2831