The Arizona grand jury process is a closed-door proceeding where 12 to 16 citizens hear evidence presented by a prosecutor and vote on whether there is probable cause to indict someone for a crime. At least nine jurors must agree before an indictment can issue. The target of the investigation has limited rights inside the room, a short window to challenge the result afterward, and everyone involved faces criminal penalties for revealing what happened.
Who Sits on the Grand Jury and for How Long
An Arizona grand jury has at least 12 members and no more than 16, with nine jurors forming a quorum. The presiding judge of the superior court sets the exact number when ordering the panel formed.1Arizona Legislature. Arizona Code 21-404 – Grand Jurors; Number; Quorum Jurors must be impartial and have no personal connection to the cases they hear.
A standard grand jury term runs up to 120 days. Under certain statutory circumstances the term can extend to 180 days, and if an investigation is still unfinished when the term ends, the presiding judge can grant more time on a petition from the county attorney.2Arizona Legislature. Arizona Code 21-403 – Term of Grand Jury
What Happens Inside the Grand Jury Room
The county attorney or another prosecuting officer runs the proceeding. That prosecutor examines witnesses in front of the jurors, advises the panel on legal questions within its authority, arranges subpoenas, and drafts indictments when the grand jury asks for one.3Arizona Legislature. Arizona Code 21-408 – Attendance of Prosecuting Attorney
This is not a trial. No judge sits in to moderate evidence. No defense attorney cross-examines witnesses. There is no requirement to present both sides. The prosecutor controls what the jurors see and hear, and the jurors decide only whether there is enough evidence to bring formal charges, not whether the person is guilty.
One conflict-of-interest safeguard applies. If the grand jury is investigating the prosecuting attorney, an assistant prosecutor, or someone employed by that office, no one from the office can be in the room during the investigation except as a witness. After testifying, the person under investigation has to leave.3Arizona Legislature. Arizona Code 21-408 – Attendance of Prosecuting Attorney
Your Rights if You Are the Target
If you are the person under investigation, your rights are real but narrow. The grand jury has no obligation to hear evidence you want to present, though it has the discretion to do so.4Arizona Legislature. Arizona Code 21-412 – Evidence on Behalf of Person Under Investigation You cannot demand to testify or call your own witnesses as a matter of right.
If you do choose to testify, you can have your attorney in the room with you. Your attorney’s role is strictly limited. They can advise you, but they cannot speak to the jurors, question witnesses, or communicate with anyone else present. If your attorney communicates with anyone other than you, the court can remove them from the chambers immediately.4Arizona Legislature. Arizona Code 21-412 – Evidence on Behalf of Person Under Investigation
The jurors themselves carry a duty that works in your favor. When they have reasonable grounds to believe other available evidence could explain away the charge under consideration, they are expected to require that evidence to be produced.4Arizona Legislature. Arizona Code 21-412 – Evidence on Behalf of Person Under Investigation It is one of the few built-in checks on a one-sided proceeding.
The Vote Required to Indict
At least nine grand jurors must agree before an indictment can be returned, no matter how many people are seated on the panel.5Arizona Legislature. Arizona Code 21-414 – Number of Grand Jurors Necessary to Indict Because the panel can be as small as 12, that nine-vote threshold is a supermajority.
When the vote is there, the foreperson endorses the indictment as a “true bill” and signs it. If the grand jury declines to indict, no charges move forward at that stage. An indictment cannot be thrown out just because one or more jurors turned out to be unqualified, as long as at least nine qualified jurors concurred in the decision.5Arizona Legislature. Arizona Code 21-414 – Number of Grand Jurors Necessary to Indict
Secrecy Rules and Penalties for Leaking
Under ARS 13-2812, a person commits unlawful grand jury disclosure by knowingly revealing the substance of any grand jury testimony, any decision the panel reached, or any other matter connected to the proceedings.6Arizona Legislature. Arizona Code 13-2812 – Unlawful Grand Jury Disclosure; Classification The rule reaches jurors, witnesses, prosecutors, court staff, and anyone else who learned information through the proceedings.
The offense is a class 1 misdemeanor, the most serious misdemeanor classification in Arizona.6Arizona Legislature. Arizona Code 13-2812 – Unlawful Grand Jury Disclosure; Classification A conviction carries up to six months in jail,7Arizona Legislature. Arizona Code 13-707 – Misdemeanors; Sentencing a fine of up to $2,500,8Arizona Legislature. Arizona Code 13-802 – Fines for Misdemeanors and up to three years of probation.9Arizona Legislature. Arizona Code 13-902 – Periods of Probation; Monitoring; Fees The word “knowingly” matters. Prosecutors have to prove the disclosure was deliberate, not accidental, though an offhand comment can still qualify if the speaker knew the information came from grand jury proceedings.
Three narrow exceptions appear in the statute. Prosecutors, court personnel, and other officials handling grand jury matters can share information to the extent necessary to perform their official duties. The prosecutor has discretion to inform a victim about the status of the case. And a judge can authorize disclosure when it serves the interests of justice.6Arizona Legislature. Arizona Code 13-2812 – Unlawful Grand Jury Disclosure; Classification Anything outside those categories is a criminal offense. The official-duties exception does not cover casual conversation with people who have no role in the case, and the victim-notification exception is limited to case status, not witness testimony.
Challenging a Grand Jury Indictment
Being indicted does not end your ability to fight the charges. Under Arizona’s Rules of Criminal Procedure, a defendant can file a motion for a new finding of probable cause. The grounds are specific: you have to show either that you were denied a substantial procedural right during the proceedings, or that fewer than nine qualified jurors voted for the indictment.10Arizona Attorney General. Motion for a Court Order Re the State Grand Jury Process
The deadline is short. The motion must be filed within 45 days after the grand jury’s minutes are filed with the court or after arraignment, whichever comes first. Missing that window generally forfeits the challenge on those grounds. A “substantial procedural right” violation could include the prosecutor putting plainly inadmissible evidence in front of the jurors, or the target being denied the statutory right to have counsel present during their own testimony.
If the court grants the motion, the case is not automatically dismissed. The prosecution usually gets to re-present the case to a new grand jury, this time with the procedural defect corrected.