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ARS 13-4221: Preservation of biological evidence

ARS 13-4221: Preservation of biological evidence

Michael Tamou, Arizona criminal defense attorney

Michael Tamou

Founding Attorney · Sex Crime Defense

5.0 · Sex Crime Defense

The complete text of A.R.S. § 13-4221 on preservation of biological evidence, and how this section is used in Arizona criminal cases. It defines terms and procedure rather than creating an offense.

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Michael Tamou, Arizona criminal defense attorney

Michael Tamou

Founding Attorney · Sex Crime Defense

★★★★★ 5.0 · Sex Crime Defense

Written and legally reviewed by Michael Tamou, Founding Attorney of Tamou Law Group, PLLC. Last updated September 4, 2026.

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What § 13-4221 Sets Out

A.R.S. § 13-4221 is the Arizona statute on preservation of biological evidence. 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. Notwithstanding any other law, the appropriate governmental entity shall retain all identified biological evidence that is secured in connection with a felony sexual offense or homicide for:

  1. The period of time that a person who was convicted of a felony sexual offense or homicide remains incarcerated for that offense or until the completion of the person’s supervised release.
  2. A cold case, fifty-five years or until a person is convicted of the crime and remains incarcerated or under supervised release for that offense.

Full Text of A.R.S. § 13-4221

A. Notwithstanding any other law, the appropriate governmental entity shall retain all identified biological evidence that is secured in connection with a felony sexual offense or homicide for:

1. The period of time that a person who was convicted of a felony sexual offense or homicide remains incarcerated for that offense or until the completion of the person’s supervised release.

2. A cold case, fifty-five years or until a person is convicted of the crime and remains incarcerated or under supervised release for that offense.

B. The governmental entity shall preserve the evidence for the period of time prescribed in subsection A of this section in a condition that is suitable for deoxyribonucleic acid testing.

C. Evidence retained pursuant to this section shall be made available for deoxyribonucleic acid testing pursuant to section 13-4240.

D. The government entity that investigates the crime may establish procedures for retaining probative samples of the biological evidence and disposing of bulk evidence that do not affect the suitability of the probative sample for deoxyribonucleic acid testing. The government entity responsible for retaining the samples shall obtain approval from the county attorney or attorney general before disposal of any bulk evidence. Before the disposal of any bulk evidence, reasonable efforts shall be made to provide written notice to the victim.

E. This section does not preclude a governmental entity from disposing of evidence in a case in which a conviction has been obtained after the expiration of the defendant’s sentence. Under any other circumstance, the governmental entity may dispose of physical evidence after the conclusion of the convicted defendant’s direct appeal and first postconviction relief proceeding or after the time for initiating the direct appeal and first postconviction relief proceeding has expired, with the agreement of the county attorney or the attorney general and then, upon written notice to the defendant, any counsel of record and the victim if no other law requires that biological evidence be preserved or retained.

F. This section does not limit a governmental entity’s discretion concerning the conditions under which biological evidence is retained, preserved or transferred among different entities if the evidence is retained in a condition that is suitable for deoxyribonucleic acid testing.

G. For the purposes of this section:

1. “Biological evidence” includes a sexual assault forensic examination kit, semen, blood, saliva, hair, skin tissue or other identified biological material.

2. “Cold case” means a homicide or a felony sexual offense that remains unsolved for one year or more after being reported to a law enforcement agency and that has no viable and unexplored investigatory leads.

Source: Arizona Revised Statutes § 13-4221, 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 § 13-4221 Affects an Arizona Case

§ 13-4221 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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Common Questions

Frequently Asked Questions

What is A.R.S. § 13-4221?

A.R.S. § 13-4221 is the Arizona statute on preservation of biological evidence. It sets out rules that apply across Arizona criminal cases rather than defining a single offense.

Where can I read the official text of § 13-4221?

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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