(1) All testimony to be considered by the board shall be sworn, and each person shall swear or affirm that the testimony to be given shall be the truth, the whole truth, and nothing but the truth, or according to the provisions of chapter 5.28 RCW.

(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 board, in the English language, to the best of the interpreter's skill and judgment.