Wash. Rev. Code § 10.27.080
No person shall be present at sessions of the grand jury or special inquiry judge except the witness under examination and his or her attorney, public attorneys, the reporter, an interpreter, a public servant guarding a witness who has been held in custody, if any, and, for the purposes provided for in RCW 10.27.170, any corporation counsel or city attorney. The attorney advising the witness shall only advise such witness concerning his or her right to answer or not answer any questions and the form of his or her answer and shall not otherwise engage in the proceedings. No person other than grand jurors shall be present while the grand jurors are deliberating or voting. Any person violating either of the above provisions may be held in contempt of court.
RCW 10.27.080