Hahman v. Hahman
In Hahman v. Hahman, 129 Ariz. 101, 628 P.2d 984 (App. 1981), the Court determined that when two or more parties employ the same attorney, their communications are not privileged as against each other; in a suit between the two parties, either can compel the attorney to disclose the communications. 129 Ariz. at 103, 628 P.2d at 986.
But nothing in Hahman suggests that by choosing joint representation communications to the attorney or therapist are not privileged in actions against third parties. Id.