Ariz. Admin. Code § R12-14-626
All witnesses at the hearing shall testify under oath or affirmation. At the request of a party, or at the discretion of the Commission, the Commission may exclude witnesses who are not parties from the hearing room so that they cannot hear the testimony of other witnesses.
New Section made by final rulemaking at 21 A.A.R. 297, effective April 14, 2015 (Supp. 15-1).