(1) For all proceedings authorized by this chapter, the commission may issue a subpoena to:
(a) require the attendance of a witness; or
(b) direct the production of evidence.
(2) The commission shall issue a subpoena under this section:
(a) as required under Section 63A-14-706;
(b) at the direction of the chair, if the chair determines that the testimony or evidence is relevant to the review of a complaint; or
(c) upon a vote of a majority of the commission members.