A social study, consisting of an investigation and evaluation of the child, shall be prepared or procured by the probation department in all proceedings under the provisions of HRS section 571-11(1) or (2), unless this requirement is waived by the court.

A social study shall not be commenced before the adjudication hearing in denial cases without the consent of the parties. If the adjudicating officer wishes additional information not reflected in the study, the hearing may be postponed or continued for a reasonable time.