ARS 13-4521: Dangerous and incompetent defendants
The complete text of A.R.S. § 13-4521 on dangerous and incompetent defendants, and how this section is used in Arizona criminal cases. It defines terms and procedure rather than creating an offense.
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Full Text of A.R.S. § 13-4521
A.R.S. § 13-4521 is the Arizona statute on dangerous and incompetent defendants. It sets out procedure and rules rather than defining an offense, so no offense class or sentence attaches to this section on its own.
A. If a court enters an order pursuant to section 13-4517, subsection A, paragraph 4, the court shall hold a hearing within ten days after the order is issued to determine if the proof is evident or the presumption great that the defendant committed the act that constitutes a serious offense as defined in section 13-706. If the court does not find the proof is evident or the presumption great that the defendant committed the act, the court shall proceed pursuant to section 13-4517, subsection A, paragraph 1, 2 or 3.
B. If the court does find the proof is evident or the presumption great pursuant to subsection A of this section, the court shall hold a trial within one hundred twenty days after the court issued the order pursuant to section 13-4517, subsection A, paragraph 4 to determine if the defendant is dangerous and should be involuntarily committed. Unless the state or defendant requests a jury trial, a trial held pursuant to this subsection shall be before the court.
C. The Arizona rules of evidence and the Arizona rules of civil procedure apply to proceedings held pursuant to this section, except that the court may consider evidence that is not admissible under the Arizona rules of evidence when making a determination pursuant to subsection A of this section.
D. If there has not been a previous evaluation to determine whether the defendant is dangerous, the defendant shall be examined by mental health experts in accordance with the requirements of section 13-4509, subsection D to determine if the defendant should be considered dangerous. The state and the defendant may each retain a mental health expert to examine the defendant and present the defendant’s mental health evaluation at the trial.
E. At a trial to determine if the defendant is dangerous, the state shall establish beyond a reasonable doubt that the defendant is dangerous and should be involuntarily committed. If the factfinder does not find that the defendant is dangerous or does not find that the defendant should be involuntarily committed, the court shall proceed pursuant to section 13-4517, subsection A, paragraph 1, 2 or 3.
F. If the factfinder finds that the defendant is dangerous and should be involuntarily committed, the court shall dismiss the charges against the defendant without prejudice and order the defendant to be committed to a secure state mental health facility. The defendant shall receive education, care, supervision and treatment to render the defendant either competent or nondangerous.
G. If the court issues a commitment order pursuant to this section:
1. All further proceedings for the defendant’s continued treatment and the circumstances under which the defendant may be released shall be conducted pursuant to title 36, chapter 40.
2. The order shall require that the defendant remain committed to a secure state mental health facility until any of the following occurs:
(a) The court finds that the defendant is competent to stand trial.
(b) The court finds that the defendant is no longer dangerous.
H. A commitment order issued pursuant to this section may not be in effect for more than the presumptive sentence the defendant could have received for the highest charged offense pursuant to section 13-702 or 13-703, section 13-704, subsection A, B, C, D or E, section 13-705, section 13-706, subsection A, section 13-708, subsection D or section 13-751 or any section for which a specific sentence is authorized. In making this determination, the court may not consider the sentence enhancements under section 13-703 or 13-704 for prior convictions. The court shall consider all time a defendant has been in custody, including pretrial detention and custody under title 36.
I. The court shall retain jurisdiction over a defendant who is committed pursuant to this section until the court discharges the defendant from treatment. If a defendant is discharged or released on the expiration of a commitment order issued pursuant to this section, the medical director of the secure state mental health facility from which the defendant is discharged or released or the state may file a petition stating that the defendant requires further treatment pursuant to title 36, chapter 5 or the appointment of a guardian pursuant to title 14.
J. Findings by the court made pursuant to this section and, except as provided in section 13-4508, any statements made by the defendant during an examination by a mental health expert pursuant to section 13-4509 are inadmissible in any proceeding other than a proceeding under title 36, chapters 5 and 40.
K. A person who is involuntarily committed to a secure state mental health facility pursuant to this section shall receive credit for all time spent under the jurisdiction of the secure state mental health facility if the person is found competent to stand trial and is subsequently sentenced to the state department of corrections for any of the charges that were the basis for the involuntary commitment.
L. The court shall annually report the following information for the previous year to the Arizona criminal justice commission:
1. The number of court orders for a trial pursuant to section 13-4517, subsection A, paragraph 4, including the number of jury trials that were held.
2. The number of defendants who are committed after a trial pursuant to this section.
3. The number of committed defendants who are conditionally released to a less restrictive alternative.
4. The number of committed defendants who are restored to competency or determined to not be dangerous and who are discharged.
Source: Arizona Revised Statutes § 13-4521, Arizona Legislative Council revision of 09/19/25. Read the official text on azleg.gov. Statutes change; verify the current version before relying on it.
How § 13-4521 Affects an Arizona Case
§ 13-4521 usually matters because of how it interacts with the charge someone is actually facing. We read it alongside the charging statute, because a definition or a procedural rule frequently decides what the State must prove, what a judge may impose, or what relief is available afterward.
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Frequently Asked Questions
What is A.R.S. § 13-4521?
A.R.S. § 13-4521 is the Arizona statute on dangerous and incompetent defendants. It sets out rules that apply across Arizona criminal cases rather than defining a single offense.
Where can I read the official text of § 13-4521?
The Arizona Legislature publishes it at azleg.gov, in the revision dated 09/19/25. The complete text is reproduced on this page, and every Arizona criminal statute is searchable on our Arizona Criminal Code index.
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