In Mountain States Tel. & Tel. Co. v. Arizona Corp. Comm'n, 160 Ariz. 350, 357, 773 P.2d 455 (1989), the supreme court recognized that a governmental department or agency can "impose content-neutral, reasonable time, place, and manner regulations that tangentially affect speech." 160 Ariz. at 358, 773 P.2d at 463. But such regulations, said the court, "must regulate with narrow specificity so as to affect as little as possible the ability of the sender and receiver to communicate." Id.