Deutsche Bank National Bank v. Jean LeTennier
SC New York · Jan 8, 2026
What happened in this matter?
The court imposed $7,500 in sanctions against defense counsel and $2,500 against the defendant for submitting at least 23 fabricated legal authorities and misrepresenting real case law in five appellate filings. The court determined this conduct was frivolous and violated professional obligations to verify the accuracy of all submissions.
- Why the court cared
- Fabricated: Case Law | Submission of no less than 23 fabricated legal authorities across five filings, identified by plaintiff and confirmed by the court. || Fabricated: Case Law | Example fabricated citation submitted as 'Tishman Realty & Construction Co. v. Regan' with a New York citation that does not correspond to any reported state or federal case. || Misrepresented: Case Law | Misrepresentation of the holding of a real case—presented as dispositive for defendant when the cited case holds the opposite.
- Why it matters now
- Twenty-three fake cites across five filings equals $10K sanctions — mandate cite-check before every filing, not just the first.
Why this matter is tracked
In a mortgage foreclosure appeal, the New York Supreme Court, Appellate Division, affirmed lower court orders and imposed monetary sanctions against both the defendant and his counsel for frivolous conduct. The court found that defense counsel submitted at least 23 fabricated legal authorities across five filings and misrepresented the holdings of real cases. Counsel admitted during oral argument to using generative AI in the preparation of these papers without adequate verification. The court emphasized that while the use of GenAI is not inherently improper, it does not absolve attorneys of their professional obligation to perform diligent cite-checking. The court imposed a total of $7,500 in sanctions against counsel and $2,500 against the defendant for the frivolous appeal.
Twenty-three fake cites across five filings equals $10K sanctions — mandate cite-check before every filing, not just the first.
Record details
What the record establishes about AI use
Counsel admitted to using GenAI in the preparation of papers.
Appeal from three Supreme Court orders (March 2023, August 2024, and September 2024) in a mortgage foreclosure action; the Appellate Division affirmed the orders and granted the plaintiff's motion for sanctions.
Correction behavior is not separately verified in the current record.
Tracked discrepancy record
3 citation, quotation, or authority issues are recorded in the source dataset.
- Fabricated: Case Law | Submission of no less than 23 fabricated legal authorities across five filings, identified by plaintiff and confirmed by the court.
- Fabricated: Case Law | Example fabricated citation submitted as 'Tishman Realty & Construction Co. v. Regan' with a New York citation that does not correspond to any reported state or federal case.
- Misrepresented: Case Law | Misrepresentation of the holding of a real case—presented as dispositive for defendant when the cited case holds the opposite.
Questions this record answers
- What happened in Deutsche Bank National Bank v. Jean LeTennier?
- The court imposed $7,500 in sanctions against defense counsel and $2,500 against the defendant for submitting at least 23 fabricated legal authorities and misrepresenting real case law in five appellate filings. The court determined this conduct was frivolous and violated professional obligations to verify the accuracy of all submissions.
- Why does Deutsche Bank National Bank v. Jean LeTennier matter for legal AI risk?
- Twenty-three fake cites across five filings equals $10K sanctions — mandate cite-check before every filing, not just the first.
- What does the public record establish about Deutsche Bank National Bank v. Jean LeTennier?
- 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 Deutsche Bank National Bank v. Jean LeTennier 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.