California Code, Government Code - GOV § 11440.30

(b)(1) Except as provided in paragraph (2), the presiding officer may not conduct all of a hearing by telephone, television, or other electronic means if a party objects.

(2) If a party objects pursuant to paragraph (1) to a hearing being conducted by electronic means, the presiding officer shall consider the objections and may, in the presiding officer's discretion, structure the hearing to address the party's specific objections and may require the presiding officer, parties, and witnesses, or a subset of parties and witnesses based on the specific objections, to be present in a physical location during all or part of the hearing.