A.R.S. § 21-423: Jurors; judicial supervision

A. A state grand jury shall consist of the same number of members as a county grand jury. The residence and qualifications of the members of the state grand jury shall be determined according to rules adopted by the supreme court which, at its discretion, depending on the nature of the matters to be investigated, may permit the jury members to be residents of either one county or several counties.

B. The jury commissioner of the county in which the assignment judge is serving shall cause the panel members to be summoned for service.

C. Judicial supervision of the state grand jury shall be maintained by the assignment judge and all indictments, presentments and formal returns of any kind made by a state grand jury shall be returned to the assignment judge.