Anthony C. Hill v. Workday, Inc. (1)
N.D. California · Sep 5, 2025
What happened in this matter?
The court sanctioned Attorney Katherine Cervantes for filing a brief with a fabricated citation and misrepresented case law. The court ordered the attorney to circulate the relevant court orders to her firm's staff and complete four hours of live, in-person continuing legal education covering law practice management, professional ethics, and the ethical use of AI in legal practice.
- Why the court cared
- The court reasoned that regardless of whether the fake citation originated from CoCounsel or human error, the attorney breached her duty of competence and diligence by failing to verify the existence and accuracy of cited authorities before filing. The court found the attorney's initial explanation of a software 'glitch' implausible given the 'Frankensteinian' nature of the citation, which contained mismatched party names, docket numbers, and dates. The court emphasized that attorneys bear ultimate responsibility for filings and that delegation to staff does not excuse a failure to perform a reasonable inquiry into the law.
- Why it matters now
- This case underscores that courts hold attorneys strictly accountable for the accuracy of citations, regardless of whether AI tools were used. It highlights the judicial rejection of 'software glitch' defenses when citations are demonstrably fabricated and reinforces the non-delegable duty to verify all legal authority.
Why this matter is tracked
Misrepresented: Case Law | Counsel attributed a parenthetical quotation to Mir that misstated the case's holding; Court questioned the accuracy and required explanation. Outcome: Order to circulate decision in law firm; CLE. "In her declaration, Attorney Cervantes described the erroneous citation as her own inadvertent error and further implied that Westlaw’s tool may have “glitched” by erroneously producing the citation. [Dkt. 31 at ¶ 4]. Specifically, she indicates that the copy citation tool mayhave inadvertently copied the wrong citation information.Yet, that explanation seems highly improbable. The citation was incorrect in every respect and none of the sub-parts of the citation match each other, including the case docket number, reporter, pincite, court information, and date information. The likelihood of every component of a citation being simultaneously wrong due to a software malfunction in transcribing from a “correct” citation is, in the Court’s view, statistically improbable (particularly given Westlaw’s representations as to the accuracy of its tools and the apparent resources Westlaw has devoted to promoting the reputation of this tool). If one set of numbers had been transposed, or if the date were wrong, such transcription errors might be explicable. However, the fact that the party names, docket number, Westlaw citation, date, and court all failed to match, resulting in a mashup citation, cannot credibly be attributed to a software error, let alone a mistranscription or copying mistake. Rather,this Frankensteinian legal citation, stitched together from mismatched party names, docket numbers, dates, and courts, bears the hallmarks of an AI-generated hallucination, as documented in numerous published opinions and reports."
This case underscores that courts hold attorneys strictly accountable for the accuracy of citations, regardless of whether AI tools were used. It highlights the judicial rejection of 'software glitch' defenses when citations are demonstrably fabricated and reinforces the non-delegable duty to verify all legal authority.
Record details
What the record establishes about AI use
The attorney admitted to using Westlaw's CoCounsel tool.
The court issued an Order to Show Cause regarding fake citations and misrepresented holdings in a Joint Discovery Letter Brief, followed by a hearing and a final order imposing 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 | Brief included a nonexistent case citation (a 'mashup' citation) that did not match any real opinion; Court treated it as an AI-style fabricated citation and faulted counsel for failing to verify.
- Misrepresented: Case Law | Counsel attributed a parenthetical quotation to Mir that misstated the case's holding; Court questioned the accuracy and required explanation.
Questions this record answers
- What happened in Anthony C. Hill v. Workday, Inc. (1)?
- The court sanctioned Attorney Katherine Cervantes for filing a brief with a fabricated citation and misrepresented case law. The court ordered the attorney to circulate the relevant court orders to her firm's staff and complete four hours of live, in-person continuing legal education covering law practice management, professional ethics, and the ethical use of AI in legal practice.
- Why does Anthony C. Hill v. Workday, Inc. (1) matter for legal AI risk?
- This case underscores that courts hold attorneys strictly accountable for the accuracy of citations, regardless of whether AI tools were used. It highlights the judicial rejection of 'software glitch' defenses when citations are demonstrably fabricated and reinforces the non-delegable duty to verify all legal authority.
- What does the public record establish about Anthony C. Hill v. Workday, Inc. (1)?
- 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 Anthony C. Hill v. Workday, Inc. (1) 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.