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
Risk Subdomain
A further 23 subdomains create an accessible and understandable classification of hazards and harms associated with AI
3.1. False or misleading information
Risk Domain
The Domain Taxonomy of AI Risks classifies risks into seven AI risk domains: (1) Discrimination & toxicity, (2) Privacy & security, (3) Misinformation, (4) Malicious actors & misuse, (5) Human-computer interaction, (6) Socioeconomic & environmental harms, and (7) AI system safety, failures & limitations.
- Misinformation
Entity
Which, if any, entity is presented as the main cause of the risk
Human
Timing
The stage in the AI lifecycle at which the risk is presented as occurring
Post-deployment
Intent
Whether the risk is presented as occurring as an expected or unexpected outcome from pursuing a goal
Unintentional
Incident Reports
Reports Timeline
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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 AI incident similar to a known case—it has the same causes, harms, and AI system. Instead of listing it separately, we group it under the first reported incident. Unlike other incidents, variants do not need to have been reported outside the AIID. Learn more from the research paper.
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