If, in the judgment of the Board, an investigation is necessary, it shall appoint a time and place for hearing and give the patient's attorney, guardian, spouse, parent, adult child, or interested party, if any, in that order, and the head of the hospital reasonable notice thereof. At the time appointed, it shall conduct a hearing and make any lawful order the case requires. (Added 1967, No. 305 (Adj. Sess.), § 1, eff. Oct. 1, 1968; amended 2017, No. 113 (Adj. Sess.), § 101.)