Okla. Stat. tit. 75, § 75-313: Agency members not to communicate

Unless required for the disposition of ex parte matters

authorized by law, members or employees of an agency assigned to

render a decision or to make findings of fact and conclusions of law

in an individual proceeding shall not communicate, directly or

indirectly, in connection with any issue of fact, with any person or

party, nor, in connection with any issue of law, with any party or

his representative, except upon notice and opportunity for all

parties to participate. An agency member (1) may communicate with

other members of the agency, and (2) may have the aid and advice of

one or more personal assistants.