In investigating a complaint or referral, including in a hearing under Division 2—
(a) an investigating panel is bound by the rules of natural justice; and
(b) an investigating panel is not bound by the rules of evidence; and
(c) an investigating panel may inform itself and otherwise deal with the complaint or referral in any matter that the investigating panel reasonably thinks fit; and
(d) to the extent that proper consideration of the matters before an investigating panel permits, the investigating panel must—
(i) act expeditiously; and
(ii) subject to section 62, act confidentially.