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HomeCasesMertz & Mertz (No 3)
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Corpus matter record

Mertz & Mertz (No 3)

Family Court · Nov 28, 2025

AustraliaEditorial impact: highfake citationsbar referralfamilytrialMonetaryBar Referral
Direct answer

What happened in this matter?

The Court ordered the appellant's solicitor to pay AUD 10,000 in costs for correcting AI-generated errors and referred the conduct of the solicitor and two counsel to professional regulatory bodies for investigation after they filed unverified, hallucinated case law citations in court documents.

Why the court cared
The Court reasoned that legal practitioners have an absolute professional and ethical obligation to verify the accuracy and relevance of all authorities cited in court documents, regardless of whether AI was used in their preparation. The Court emphasized that reliance on unverified AI research misleads the court, wastes time, and creates unnecessary complexity. It determined that referring the practitioners to regulatory bodies was necessary both for disciplinary review and to serve the public interest by highlighting the risks associated with AI in legal practice.
Why it matters now
Australian family courts are now pairing AUD 10K costs orders with bar referrals when counsel files unverified AI authorities — professional jeopardy is real.

Why this matter is tracked

In Mertz & Mertz (No 3) [2025] FedCFamC1A 222, the Federal Circuit and Family Court of Australia addressed the use of generative AI by legal practitioners in the preparation of a Summary of Argument and List of Authorities. The appellant's legal team filed documents containing non-existent, inaccurate, and misleading case law citations, which the Court identified as AI-generated hallucinations. The practitioners admitted they failed to verify the AI-generated content. The Court ordered the appellant's solicitor to pay the respondent AUD 10,000 in costs specifically related to correcting the AI-induced errors. Furthermore, the Court referred the conduct of the involved legal practitioners (a solicitor and two counsel) to the relevant professional regulatory bodies in South Australia and Victoria for investigation.

Operational lesson

Australian family courts are now pairing AUD 10K costs orders with bar referrals when counsel files unverified AI authorities — professional jeopardy is real.

Record details

CourtFamily Court
Jurisdictioninternational
CircuitNot recorded
DateNov 28, 2025
UN
AI toolUnidentified
Party typeLawyer
OutcomeThe Court ordered the appellant's solicitor to pay AUD 10,000 in costs to the respondent for correcting AI-related errors and referred the conduct of the solicitor and two counsel to the South Australian Legal Profession Conduct Commissioner and the Victorian Legal Services Board and Commissioner.
Known amountA$10,000
Professional sanctionNo
Attribution boundary

What the record establishes about AI use

admitted

Practitioners admitted AI use but did not identify the specific program.

Procedural posture

Appellate proceedings in the Federal Circuit and Family Court of Australia (Division 1) following a Notice of Discontinuance filed by the appellant.

Correction behavior

Correction behavior is not separately verified in the current record.

Tracked discrepancy record

1 citation, quotation, or authority issues are recorded in the source dataset.

  1. Fabricated: Case Law | Originally filed Summary of Argument (17 Oct 2025) contained non-existent, inaccurate and misleading authorities generated with the assistance of AI; Court described these as hallucinations and accepted they had not been verified.

Questions this record answers

What happened in Mertz & Mertz (No 3)?
The Court ordered the appellant's solicitor to pay AUD 10,000 in costs for correcting AI-generated errors and referred the conduct of the solicitor and two counsel to professional regulatory bodies for investigation after they filed unverified, hallucinated case law citations in court documents.
Why does Mertz & Mertz (No 3) matter for legal AI risk?
Australian family courts are now pairing AUD 10K costs orders with bar referrals when counsel files unverified AI authorities — professional jeopardy is real.
What does the public record establish about Mertz & Mertz (No 3)?
Retained unchanged after audit: the existing summary is source-specific, non-placeholder, and supported by the recorded source link. Read the underlying source before relying on it for legal advice or a filing.
Which source supports this Mertz & Mertz (No 3) summary?
The recorded source is Damien Charlotin case archive. It is classified as publisher document archive; review the linked material and subsequent docket history before relying on this summary.

Related matters

Related by court, jurisdiction, tool, or classified failure pattern. Similarity does not imply the same facts or outcome.

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