Disciplinary measures for actions violating either the rules and regulations of the Commission or the internal procedures of the sheriff’s office may be taken by the sheriff. Such disciplinary measures may include suspension of any certified person for reasonable periods, not exceeding a cumulative 30 days in any 12-month period. However, on and after June 1, 2007, in any sheriff’s office with a collective bargaining agreement covering the employment of department personnel, such disciplinary measures and the method of review of those measures shall be subject to mandatory bargaining, including, but not limited to, the use of impartial arbitration as an alternative or supplemental form of due process.