(1) The commission shall determine all questions pertaining to representation and shall administer all elections and be responsible for the processing and adjudication of all disputes that arise as a consequence of elections. The commission shall adopt rules that provide for at least the following:
(a) Secret balloting;
(b) Consulting with employee organizations;
(c) Access to lists of employees, job classification, work locations, and home mailing addresses;
(d) Absentee voting;
(e) Procedures for the greatest possible participation in voting;
(f) Campaigning on the employer's property during working hours; and
(g) Election observers.
(2) If an employee organization has been certified as the exclusive bargaining representative of the employees of a bargaining unit, the employee organization may act for and negotiate master collective bargaining agreements that will include within the coverage of the agreement all employees in the bargaining unit.
(3) The certified exclusive bargaining representative is responsible for representing the interests of all the employees in the bargaining unit. This section shall not be construed to limit an exclusive representative's right to exercise its discretion to refuse to process grievances of employees that are unmeritorious.
(4) No question concerning representation may be raised if:
(a) Fewer than twelve months have elapsed since the last certification or election; or
(b) A valid collective bargaining agreement exists covering the unit, except for that period of no more than one hundred twenty calendar days and no less than ninety calendar days before the expiration of the contract.