Arizona Revised Statutes
13-3881. Arrest; how made; force and restraint A. An arrest is made by an actual restraint of the person to be arrested, or by his submission to the custody of the person making the arrest.
B. No unnecessary or unreasonable force shall be used in making an arrest, and the person arrested shall not be subjected to any greater restraint than necessary for his detention.
13-3884. Arrest by private person A private person may make an arrest:
1. When the person to be arrested has in his presence committed a misdemeanor amounting to a breach of the peace, or a felony.
2. When a felony has been in fact committed and he has reasonable ground to believe that the person to be arrested has committed it.
13-3889. Method of arrest by private person A private person when making an arrest shall inform the person to be arrested of the intention to arrest him and the cause of the arrest, unless he is then engaged in the commission of an offense, or is pursued immediately after its commission or after an escape, or flees or forcibly resists before the person making the arrest has opportunity so to inform him, or when the giving of such information will imperil the arrest.
13-3900. Duty of private person after making arrest A private person who has made an arrest shall without unnecessary delay take the person arrested before the nearest or most accessible magistrate in the county in which the arrest was made, or deliver him to a peace officer, who shall without unnecessary delay take him before such magistrate. The private person or officer so taking the person arrested before the magistrate shall make before the magistrate a complaint, which shall set forth the facts showing the offense for which the person was arrested. If, however, the officer cannot make the complaint, the private person who delivered the person arrested to the officer shall accompany the officer before the magistrate and shall make to the magistrate the complaint against the person arrested.
http://www.azleg.state.az.us/ars/13/title13.htm