Oregon Revised Statutes Miscellaneous Matters Related to Government and Public Affairs § 190.760

(1) The arbitrator shall regulate the hearing in accordance with the rules of the American Arbitration Association except that:

(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.