Arizona Third-Party Summons is a legal procedure used to bring a third party into a legal dispute. This is done when a defendant needs to be served with a summons but cannot be found. There are two types of Arizona Third-Party Summons: the Standard Summons and the Third-Party Summons. The Standard Summons is issued by the court when the defendant cannot be located or served and requires the summons to be served on the third party. The Third-Party Summons is issued by the plaintiff and requires the third party to serve the summons on the defendant. Both types of summons require the third party to provide proof of service to the court.