Dineen/Shibata v. Kotchka
CA Arizona (1d) · Jul 15, 2026
What happened in this matter?
The court sanctioned the pro se appellant for submitting an appellate brief containing hallucinated and misrepresented case law generated by AI. The court affirmed the lower court's order and awarded the appellee attorneys' fees and costs as a sanction for the appellant's failure to verify the accuracy of his legal citations.
- Why the court cared
- The court reasoned that all litigants, including pro se parties, have a non-delegable duty to ensure the accuracy of their filings. Because the appellant admitted to using Gen-AI without any independent verification, his reliance on hallucinated authorities rendered his claims objectively groundless and demonstrated a reckless indifference to the truth, satisfying the requirements for sanctions under A.R.S. § 12-349 and ARCAP 25.
- Why it matters now
- This case establishes that Arizona courts will hold pro se litigants to the same standards as attorneys regarding the verification of AI-generated content. It confirms that 'hallucination' is not a defense to sanctions when a litigant fails to exercise reasonable diligence in verifying legal authorities.
Why this matter is tracked
The Arizona Court of Appeals affirmed a lower court's probate order after the pro se appellant, Jeffrey Kotchka, submitted an opening brief containing multiple inaccurate citations and two entirely fabricated cases. Kotchka admitted to using generative AI for research without independently verifying the output. The court determined that the appellant's failure to verify the accuracy of his filings violated ARCAP 13 and constituted an abuse of AI tools. Finding the claims groundless and maintained in bad faith due to reckless indifference, the court exercised its inherent powers and statutory authority under A.R.S. § 12-349 and ARCAP 25 to impose sanctions, awarding the appellee reasonable attorneys' fees and costs incurred as a result of the appellant's misconduct.
This case establishes that Arizona courts will hold pro se litigants to the same standards as attorneys regarding the verification of AI-generated content. It confirms that 'hallucination' is not a defense to sanctions when a litigant fails to exercise reasonable diligence in verifying legal authorities.
Record details
What the record establishes about AI use
The appellant admitted to using generative artificial intelligence tools.
Appellate review of a superior court order for formal probate and appointment of a personal representative, resulting in an affirmed judgment and a sanctions order.
Correction behavior is not separately verified in the current record.
Tracked discrepancy record
2 citation, quotation, or authority issues are recorded in the source dataset.
- Fabricated: Case Law | Appellant's brief included two cited cases that the court determined do not exist; the court struck each such citation and treated them as AI-generated fabrications.
- Misrepresented: Case Law | Appellant's brief contained multiple mis-citations and misstatements of existing cases (wrong pages/paragraphs, misstated rules, and misrepresented case facts); the court struck these inaccurate citations.
Questions this record answers
- What happened in Dineen/Shibata v. Kotchka?
- The court sanctioned the pro se appellant for submitting an appellate brief containing hallucinated and misrepresented case law generated by AI. The court affirmed the lower court's order and awarded the appellee attorneys' fees and costs as a sanction for the appellant's failure to verify the accuracy of his legal citations.
- Why does Dineen/Shibata v. Kotchka matter for legal AI risk?
- This case establishes that Arizona courts will hold pro se litigants to the same standards as attorneys regarding the verification of AI-generated content. It confirms that 'hallucination' is not a defense to sanctions when a litigant fails to exercise reasonable diligence in verifying legal authorities.
- What does the public record establish about Dineen/Shibata v. Kotchka?
- The record summarizes the outcome described in the linked public source. The recorded document is hosted in the upstream publisher archive. This page is not a substitute for the complete docket, subsequent history, or jurisdiction-specific advice.
- Which source supports this Dineen/Shibata v. Kotchka summary?
- The recorded source is Damien Charlotin case archive. It is classified as publisher document archive; review the linked material and subsequent docket history before relying on this summary.
Related matters
Related by court, jurisdiction, tool, or classified failure pattern. Similarity does not imply the same facts or outcome.