The Arizona Revised Statutes have been updated to include the revised sections from the 57th Legislature, 1st Regular Session. Please note that the next update of this compilation will not take place until after the conclusion of the 57th Legislature, 2nd Regular Session, which convenes in January 2026.
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This online version of the Arizona Revised Statutes is primarily maintained for legislative drafting purposes and reflects the version of law that is effective on January 1st of the year following the most recent legislative session. The official version of the Arizona Revised Statutes is published by Thomson Reuters.
12-2203 - Admissibility of expert opinion testimony
12-2203. Admissibility of expert opinion testimony
A. In a civil or criminal action, only a qualified witness may offer expert opinion testimony regarding scientific, technical or other specialized knowledge and the testimony is admissible if the court determines that all of the following apply:
1. The witness is qualified to offer an opinion as an expert on the subject matter based on knowledge, skill, experience, training or education.
2. The opinion will assist the trier of fact in understanding the evidence or determining a fact in issue.
3. The opinion is based on sufficient facts and data.
4. The opinion is the product of reliable principles and methods.
5. The witness reliably applies the principles and methods to the facts of the case.
B. The court shall consider the following factors, if applicable, in determining whether the expert testimony is admissible pursuant to subsection A:
1. Whether the expert opinion and its basis have been or can be tested.
2. Whether the expert opinion and its basis have been subjected to peer reviewed publications.
3. The known or potential rate of error of the expert opinion and its basis.
4. The degree to which the expert opinion and its basis are generally accepted in the scientific community.