(1) The arbitrator shall regulate the hearing in accordance with the rules of the American Arbitration Association except that:
(a) The arbitrator shall take an oath of office.
(b) Testimony shall be taken under oath.
(c) After the first witness is sworn, an arbitrator may not be disqualified for bias.
(2) The arbitrator may call a neutral expert on the arbitrator’s own motion, which expert witness shall be subject to cross-examination by the parties. The cost of the expert witness is part of the cost of the proceeding.