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HD-INC-025
Legal services · Australia · 2025 · Hallucination & fabrication

An Australian Lawyer Relied on ChatGPT and Filed 17 Cases That Did Not Exist

By Ellie Harris · Filed 31 January 2025

Alleged: Applicant's legal representative developed or deployed the AI system implicated in this incident. Details are drawn from public reports; parties are presumed innocent of any wrongdoing not established by an official finding.

An Australian Lawyer Relied on ChatGPT and Filed 17 Cases That Did Not Exist

What happened

It was reported that an Australian immigration lawyer used ChatGPT to research legal authorities for a case before the Federal Circuit and Family Court of Australia, unknowingly including 17 cases that did not exist and eight passages of quotations falsely attributed to the Administrative Appeals Tribunal.

The invented cases looked convincing, complete with plausible names, citations and legal reasoning, but none could be found in the official records. The Minister’s lawyers identified the fabricated material before the hearing, revealing that the legal representative had relied on ChatGPT’s answers without checking whether the authorities were genuine.

In Valu v Minister for Immigration and Multicultural Affairs (No 2), the lawyer acknowledged that his conduct had fallen below the standard expected of a legal practitioner and breached his obligations to both the client and the Court. The judge referred the matter to the New South Wales Legal Services Commissioner.

What an auditable version would have shown

The problem was not that ChatGPT produced convincing legal references, but that those references made their way into court documents without anyone checking whether they were real.

A proper verification process would have checked every case against an authoritative legal database before the submissions were filed, confirming that the decisions existed and that any quoted passages matched the original judgments.

Had those checks been performed, the 17 invented cases would have been identified before reaching the Court, rather than being discovered by the opposing legal team.

Where the gap was

Headlights identifies overconfidence and surrendered judgement, where a professional places too much trust in an AI-generated answer and allows it to replace the independent checking their work requires.

There is a familiar psychological trap here because people are more inclined to believe information that looks authoritative, particularly when it is presented confidently and fits what they are trying to establish.

ChatGPT produced material that resembled genuine legal research, but the lawyer treated its fluency as evidence of accuracy, overlooking the distinction between a system generating plausible language and a legal database retrieving actual decisions.

The lawyer remained responsible for the submissions, yet the judgement that should have been applied to the AI’s output was effectively handed over to the technology.

What governance should have looked like

AI can help lawyers research and prepare documents, but every legal authority it produces must be checked against an independent source before it is relied upon in court.

A CitationVerifier could check whether a cited case exists, while a VerificationGate could require supporting evidence for quotations and legal claims before a document is approved for filing. A ConductRecord could then preserve evidence of those checks, allowing the lawyer or firm to demonstrate that the material had been independently verified.

The lesson extends well beyond the legal profession because the same failure can occur wherever people rely on AI to produce information they are expected to understand and verify.

Failure Pattern: A lawyer relied on ChatGPT-generated legal research without independently checking the authorities, resulting in 17 invented cases and eight fabricated passages being included in court submissions.

Governance Principle: AI-generated information must be verified against authoritative sources before it is used in decisions or documents where accuracy matters, with human responsibility remaining clear throughout.

The reference implementation of CitationVerifier, VerificationGate and ConductRecord is open source. It lives at github.com/saffronandindia/headlights-oss, Apache 2.0 licensed and free to install. The repository is public now.

Sources

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The record

An auditable system would have produced a signed, tamper-evident record the moment this happened: what the system did, the version that did it, the basis it acted on, and the action taken, and Applicant's legal representative could have produced it on demand.

This is the record the system as deployed did not produce in a signed, auditable form.

What this teaches
Capture what happened when it happens
What the system did, the version that did it, the basis it acted on, and the action taken, recorded at the moment, not reconstructed after.
Sign it, so no one has to trust the record-keeper
A tamper-evident entry. Edit it later and the signature breaks. The record does not ask for the benefit of the doubt.
Make it verifiable by anyone
A court, a regulator, a customer's lawyer can check the record themselves, without taking the company, or us, at our word.

Headlights summarises publicly reported AI incidents. All summaries are independently written, attributed to their original sources, and intended for research and educational purposes. Allegations are identified as such until established through official findings.

This report is based on the sources listed above and reflects information available at the time of review; later developments may not be captured. Where a person is described as charged with or alleged to have done something, that allegation is unproven unless a conviction or a court or regulatory finding is stated. Headlights publishes journalism and commentary, not legal advice.

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