The order to form a grand jury shall specify the number of jurors to constitute the grand jury. The grand jury shall consist of at least twelve but not more than sixteen persons, nine of whom constitute a quorum for all proceedings before it.
A.R.S. § 21-404
Grand jurors; number; quorum
Official source: Arizona State Legislature. Reproduced from public-domain Arizona statutes; confirm against the official source for the current text. Not legal advice.