Superb Motors Inc. et al. v. Anthony Deo et al.
E.D. New York · Apr 30, 2026
What happened in this matter?
The court sanctioned attorney Harry R. Thomasson $1,500 for violating Federal Rule of Civil Procedure 11 by submitting legal briefs containing fabricated, AI-generated case citations. The court rejected the attorney's defense that malware caused the errors, emphasizing that attorneys must personally verify the existence and validity of all cited legal authorities.
- Why the court cared
- The court reasoned that Rule 11 requires attorneys to conduct a reasonable inquiry into the validity of legal contentions. It found that presenting AI-generated hallucinations as valid case law constitutes subjective bad faith and that an attorney's duty to verify citations is non-delegable, regardless of alleged computer malware or pro se status.
- Why it matters now
- This case reinforces that attorneys remain strictly liable for the accuracy of their filings, even when appearing pro se. It clarifies that blaming technical issues like malware does not excuse the failure to verify AI-generated research, establishing a clear precedent for Rule 11 enforcement in the E.D.N.Y.
Why this matter is tracked
In a contract dispute, pro se defendant Harry R. Thomasson, an admitted attorney, submitted a brief containing fabricated legal citations. The court identified two nonexistent cases, 'In re Amica Mut. Ins. Co.' and 'In re Marcus,' which were attributed to the use of generative AI. Thomasson argued that computer malware caused the errors and denied using AI. The court rejected this defense, noting that attorneys have an independent duty under Rule 11 to verify all authorities before filing. Finding that the submission of hallucinated citations violated Rule 11, the court imposed a $1,500 monetary sanction to deter future misconduct, declining to refer the matter to a grievance committee.
This case reinforces that attorneys remain strictly liable for the accuracy of their filings, even when appearing pro se. It clarifies that blaming technical issues like malware does not excuse the failure to verify AI-generated research, establishing a clear precedent for Rule 11 enforcement in the E.D.N.Y.
Record details
What the record establishes about AI use
The court identified the use of generative AI.
The court issued a sua sponte Order to Show Cause regarding Rule 11 sanctions following the identification of fabricated citations in a pro se defendant's opposition brief. The court subsequently issued a Memorandum and Order imposing monetary sanctions.
Correction behavior is not separately verified in the current record.
Tracked discrepancy record
2 citation, quotation, or authority issues are recorded in the source dataset.
- Fabricated: Case Law | Opposing party identified 'In re Amica Mut. Ins. Co., 85 A.D.3d 1510 (3rd Dept. 2011)' as a nonexistent case; court treated it as an AI-generated fabricated citation.
- Fabricated: Case Law | Court independently discovered 'In re Marcus, 491 F.2d 56, 60 (2nd Cir. 1974)' as a fabricated citation and cited it as additional evidence of AI-generated hallucinations.
Questions this record answers
- What happened in Superb Motors Inc. et al. v. Anthony Deo et al.?
- The court sanctioned attorney Harry R. Thomasson $1,500 for violating Federal Rule of Civil Procedure 11 by submitting legal briefs containing fabricated, AI-generated case citations. The court rejected the attorney's defense that malware caused the errors, emphasizing that attorneys must personally verify the existence and validity of all cited legal authorities.
- Why does Superb Motors Inc. et al. v. Anthony Deo et al. matter for legal AI risk?
- This case reinforces that attorneys remain strictly liable for the accuracy of their filings, even when appearing pro se. It clarifies that blaming technical issues like malware does not excuse the failure to verify AI-generated research, establishing a clear precedent for Rule 11 enforcement in the E.D.N.Y.
- What does the public record establish about Superb Motors Inc. et al. v. Anthony Deo et al.?
- The record summarizes the outcome described in the linked public source. The recorded document is hosted in the upstream publisher archive. This page is not a substitute for the complete docket, subsequent history, or jurisdiction-specific advice.
- Which source supports this Superb Motors Inc. et al. v. Anthony Deo et al. 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.