OAC Rule 21. Interpreters. 

A.  All proceedings shall be conducted in English. A party who does not adequately speak or understand English, or any party who calls a witness who does not adequately speak or understand English, must arrange for a foreign language interpreter to be present at any hearing.  The OAC shall not provide foreign language interpreters.

B.  Immediately prior to the commencement of the hearing, any interpreter must review the "Code of Conduct for Interpreters in Administrative Hearings" and agree in writing to abide by its provisions.

C.  The judge shall inquire on the record as to the qualification of any proposed interpreter prior to permitting the interpreter to interpret for any witness.