Authority of board to issue regulations; powers of department generally. Validity of hospitalization orders entered before September 1, 1978; establishment of regulations as to orders authorizing continued hospitalization of patients hospitalized before September 1, 1978. Immunity from liability for actions taken in good faith compliance with admission and discharge provisions of chapter; immunity not applicable to failure to meet standard of care in provision of treatment. Apprehension by peace officer of patient who leaves facility without permission. Approval of private facilities as emergency receiving, evaluating, or treatment facility; powers and duties of private facilities; right to deny admission. Abandoning or leaving patients on grounds of psychiatric hospital. Loitering or trespassing on grounds of psychiatric hospital. 37-3-23.