(a) In the absence of willful misconduct or gross negligence, a county administrator, a director of a facility, a physician, a peace officer or any other authorized person who participates in a decision that a person be examined or treated under this act, or that a person be discharged, or placed under partial hospitalization, outpatient care or leave of absence, or that the restraint upon such person be otherwise reduced, or a county administrator or other authorized person who denies an application for voluntary treatment or for involuntary emergency examination and treatment, shall not be civilly or criminally liable for such decision or for any of its consequences.

(b) A judge or a mental health review officer shall not be civilly or criminally liable for any actions taken or decisions made by him pursuant to the authority conferred by this act.