The board may, pursuant to §901.151(c) of the Act (relating to General Powers and Duties of Board) and §472.107 of the Texas Government Code, employ independent contractors, including investigators and consultants, to perform services prescribed by the board. The basis for compensation of independent contractors shall be stated in the contract of employment. The board will re-procure professional services contracts no later than every four years and provide documented justification for entering into a multiyear contract or to extend a contract beyond one year for professional services.