12-921. Proceedings involving initiative or referendum measures; standing to intervene; attorney fees or costs A. In any proceeding in which the constitutionality, legality or application of a law that was enacted through an initiative is at issue, the official initiative proponent, whether an individual, a group of individuals or an organization, that wishes to defend the law shall have the right to intervene as a party and is deemed to have proper standing in the matter. B. In any proceeding in which the constitutionality, legality or application of a law that was enacted through a referendum is at issue, the legislator who was the first prime sponsor of the referendum and who wishes to defend the law shall have the right to intervene as a party and is deemed to have proper standing in the matter. C. The only objection that may be raised to a motion to intervene as of right pursuant to this section is that the proposed intervenor does not have a good faith intention to defend the law. Any party or proposed intervenor may raise this objection. D. A party who intervenes to defend a law pursuant to this section is not liable for attorney fees or costs of any party who is end the law. Any party or proposed intervenor may raise this objection. D. A party who intervenes to defend a law pursuant to this section is not liable for attorney fees or costs of any party who is challenging the constitutionality, legality or application of the law.
Arizona Legal Code