Ariz. Rev. Stat. § 12-751
B. A person who files a motion pursuant to subsection A of this section has the burden of establishing prima facie proof that the legal action was substantially motivated by a desire to deter, retaliate against or prevent the lawful exercise of a constitutional right. The moving person may submit evidence based on the record, a sworn affidavit or other evidence that is submitted with the motion to dismiss or quash. A party is not required to file a response to a motion filed pursuant to subsection A of this section unless and until the court finds that the moving party has established the prima facie proof and orders the party to file a response. The court shall grant the motion unless one of the following applies:
1. If the responding party is a state actor, the responding party shows that the legal action on which the motion is based is justified by clearly established law and that the responding party did not act in order to deter, prevent or retaliate against the moving party's exercise of constitutional rights. A state actor may satisfy the requirements of this paragraph by doing any of the following:
I. This article does not:
J. For the purposes of this section:
1. "Legal action":
(a) Means any of the following:
2. "State actor" means any of the following: