US lawArizonaCourt rulesARCrP — Rules of Criminal ProcedureIV. Pretrial ProceduresRule 12. The Grand JurySection Two. Rules for State Grand JuriesIV. Pretrial Procedures Rule 12. The Grand Jury (Refs & Annos) Section Two. Rules for State Grand Juries12.23Ariz. R. Crim. P. 12.23Rule 12.23. Size of State Grand JuryLast amended: 2018Year: 2026Length: 19 wordsOfficial source When impaneled, a state grand jury must be composed of at least 12 but not more than 16 persons.PreviousAriz. R. Crim. P. 12.22NextAriz. R. Crim. P. 12.24