Description: In early 2025, Norway’s Supreme Court (Høyesterett) received a legal filing containing hallucinated legal citations and quotes, allegedly inserted by an attorney using an AI tool without verification. The fabricated sources were detected during standard review. While no sanctions were issued, the Court updated its guidance to lawyers, warning that AI use does not exempt them from professional responsibility.
Editor Notes: Timeline notes: Exact filing date not disclosed; detected and reported by Norwegian Supreme Court officials in Q1 2025, publicized by April 10, 2025.
Entities
View all entitiesAlleged: Unspecified generative AI developer developed an AI system deployed by Unnamed Norwegian lawyer, which harmed Supreme Court of Norway , Høyesterett , Unnamed clients represented by unnamed Norwegian lawyer and Legal integrity.
Alleged implicated AI system: Unnamed generative AI system
Incident Stats
Incident ID
1027
Report Count
1
Incident Date
2025-04-10
Editors
Daniel Atherton
Incident Reports
Reports Timeline
During the first quarter of this year, the Supreme Court received a procedural document with so-called hallucinations, i.e. fabricated information. This is what Supreme Court Justice Toril Marie Øie tells Advokatbladet.
The procedural docum…
Variants
A "variant" is an incident that shares the same causative factors, produces similar harms, and involves the same intelligent systems as a known AI incident. Rather than index variants as entirely separate incidents, we list variations of incidents under the first similar incident submitted to the database. Unlike other submission types to the incident database, variants are not required to have reporting in evidence external to the Incident Database. Learn more from the research paper.
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