Applications to intervene in a proceeding shall comply with section 18-237D-4-23 and shall be served on all parties. Applications for intervention will be granted or denied at the discretion of the presiding officer. As a general policy, such applications shall be denied unless the petitioner shows that it has an interest in a question of law or fact involved in the contested matter and the petitioner's intervention will not result in the potential unauthorized disclosure of a return or return information.
Haw. Code R. § 18-237D-4-28