The case, explained

The Case of AI Hallucinations in the Court of Cassation

5 min read · Updated June 2026 · Editorial oversight: Avv. Federico Papa

Recent jurisprudential developments confirm a rigorous approach by the Supreme Court regarding technological integration in criminal proceedings. According to reports in the specialized press, the case stems from an appeal in which the defense invoked legal precedents that proved to be entirely non-existent, the result of a generative error by the software used. In this article, we will analyze how the lawyer's duty of diligence prevails over technical automation, reconstructing the stages of the legality review. Finally, we will present a hypothetical twin case for educational purposes to illustrate the concrete risks and protection strategies for professionals using AI tools.

In brief

The article analyzes the Court of Cassation's decision on the inadmissibility of an appeal containing AI "hallucinations". It examines Articles 606 and 591 of the Italian Code of Criminal Procedure, alongside the ethical duties of diligence and truthfulness. Through a hypothetical case study, it illustrates the shift from technological error to professional liability, providing practical guidelines to prevent procedural and disciplinary sanctions arising from the unverified use of new technologies in legal drafting.

  1. The fact

    According to reports by Il Sole 24 Ore, Sistema Penale, and Altalex, a lawyer filed an appeal before the Sixth Criminal Section of the Court of Cassation including extensive excerpts of reasoning and headnotes referring to rulings never actually delivered. During the examination of the document, the judges verified that the case numbers and publication years provided were non-existent.

    The lawyer admitted to using generative AI software for drafting the document, trusting the machine's outputs without prior verification. The procedural stage concluded in Cassation with a final ruling declaring the appeal inadmissible and ordering the transmission of the acts to the Bar Council for disciplinary evaluation.

  2. The rules in play

    The main provisions are Article 606 of the Italian Code of Criminal Procedure (c.p.p.), which sets out the grounds for appeal, and Article 591 c.p.p., which governs inadmissibility for lack of specificity. At the constitutional level, Article 111 regarding due process is relevant, requiring fairness and procedural loyalty.

    Under the ethical profile, the Code of Conduct for Italian Lawyers highlights Article 12 (duty of diligence) and Article 50 (duty of truthfulness), which oblige the practitioner to verify the accuracy of the data included in procedural documents.

  3. What case law says

    High court case law has clarified that an error induced by a technological tool cannot be equated to a mere clerical error or simple typo. The court emphasized that introducing non-existent precedents violates the principle of self-sufficiency of the appeal and compromises the judicial function.

    The human-in-the-loop principle has been affirmed, establishing that final responsibility for the content of the document rests solely upon the practitioner who signs it, who bears the burden of verifying and validating every algorithmic output.

  5. Analysis drafted and verified with edit.legal

    To verify the provisions cited in this article, we used edit.legal. Test our legal AI on official sources and apply it to your own matters.

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  8. What it teaches professionals

    1. Never copy and paste AI outputs without cross-referencing them against official legal databases.
    2. Always document the human review process conducted on documents generated through technological tools.
    3. Include indemnity clauses in contracts with software providers, although these carry no weight in criminal or disciplinary proceedings.
    4. Maintain continuous professional development regarding technological hallucinations to recognize their typical patterns.

References: Art. 606 c.p.p.Art. 591 c.p.p.Art. 111 CostituzioneArt. 12 Codice Deontologico ForenseArt. 50 Codice Deontologico Forense

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Avv. Federico Papa
Editorial oversight: Avv. Federico Papa·ICAM

Frequently asked questions

What sanctions does a lawyer risk for citing false rulings due to AI error?

On a procedural level, the appeal may be declared inadmissible, with an order to pay legal costs and fines to the Fines Fund (Cassa delle Ammende). On a disciplinary level, sanctions range from a formal warning or censure to suspension from practicing the profession.

Is there a statute of limitations for ethical liability in these cases?

Disciplinary action is subject to a statute of limitations under current bar regulations starting from the date of the offense, subject to interruption by the commencement of disciplinary proceedings or other formal acts. It is essential to consult the specific rules of the professional code.

What should be done if one realizes they filed a document with AI hallucinations?

The principles of fairness and loyalty require promptly informing the judicial authority of the error. The appropriate method of amendment or correction depends on the procedural stage and the type of document filed, provided that the accuracy of legal allegations is restored prior to the decision.

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