Washington Administrative Code
Title 10 - Administrative Hearings, Office of
Chapter 10-08 - Model rules of procedure
Section 10-08-160 - Adjudicative proceedings-Testimony under oath or affirmation

(1) Every person called as a witness in a hearing shall swear or affirm that the testimony they are about to give in the hearing shall be the truth according to the provisions of RCW 5.28.020 through 5.28.060. If the witness is testifying from outside the jurisdiction, the presiding officer may require the witness to agree to be bound by the laws of the state of Washington for purposes of the oath or affirmation.

(2) Every interpreter shall, before beginning to interpret, take an oath that a true interpretation will be made to the person being examined of all the proceedings in a language or in a manner which the person understands, and that the interpreter will repeat the statements of the person being examined to the agency conducting the proceedings, in the English language, to the best of the interpreter's skill and judgment.