The director shall designate a medical director who is licensed under chapter
18.57 or
18.71 RCW. The director shall also appoint such professional personnel and other assistants and employees, including professional medical screeners, as may be reasonably necessary to carry out the provisions of this chapter and chapters
74.09, 71.05, 71.24, and
71.34 RCW and other applicable law. The medical screeners must be supervised by one or more physicians whom the director or the director's designee shall appoint.