Summary
Justice Saini delivered a strong warning in joined High Court cases about AI-generated fake legal authorities. A database now tracks over 300 instances of AI hallucinations in court filings globally, with cases rising from 'two per week' to 'two or three per day' in 2025.
A UK High Court judgment has delivered a strong warning about AI hallucinations in legal filings, as a global database now tracks over 300 instances of fake AI-generated authorities submitted to courts.
In the joined cases of Ayinde v London Borough of Haringey & Al-Haroun v Qatar National Bank [2025] EWHC 1383 (Admin), Justice Saini addressed two different scenarios:
- **Ayinde**: A litigant in person (LIP) relied on hallucinated authorities
- **Al-Haroun**: Professional representatives submitted material displaying signs of AI use without proper verification
The judgment makes explicit distinctions between expectations for unrepresented litigants versus regulated lawyers. Courts will forgive the former but expect near-perfection from the latter.
Global trends:
- French researcher Damien Charlotin maintains a database tracking AI hallucination cases
- Before spring 2025, approximately two cases emerged per week
- Currently running at two to three cases per day
- Over 300 identified instances of AI hallucinations in court filings globally
Professional guidance evolution:
- **January 2024**: Bar Council of England and Wales warned that blind reliance on AI risks incompetence or gross negligence
- **May 2025**: Law Society's "Generative AI: The Essentials" codifies AI literacy as baseline professional competence
- **April 2025**: Judicial Office formalized distinction between LIP and regulated lawyer expectations
Sanctions have ranged from suspensions to warnings. Misleading the court, even inadvertently, may breach the core duty of candour.
For legal AI practitioners, the message is clear: verification protocols are not optional. Every AI-generated citation must be confirmed against authoritative sources before inclusion in any filing. The professional consequences of failure are increasingly severe.