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Anthony C. Hill v. Workday, Inc. (2)

Court
N.D. California
Jurisdiction
USA
Decided
2026-04-28
AI tool
CoCounsel
Outcome
Admonishment; Monetary Fine; 4 hours live CLE; Order Circulation
Monetary penalty
1001 USD

What was hallucinated

Fabricated: Case Law | Filed brief included a citation to a nonexistent case; court found the citation fabricated and tied its inclusion in part to AI use. || Misrepresented: Case Law | Court found the brief misrepresented the holding of a real case cited by counsel.

Sanction teardown · N.D. California, USA · 2026-04-28

Anthony C. Hill v. Workday, Inc. (2)

What happened

In N.D. California, USA, a filing relied on CoCounsel to help draft legal argument. The court identified the following problems with the citations in that filing:

  • Fabricated (Case Law)
    Filed brief included a citation to a nonexistent case; court found the citation fabricated and tied its inclusion in part to AI use.
  • Misrepresented (Case Law)
    Court found the brief misrepresented the holding of a real case cited by counsel.

Which AI tool

CoCounsel. Note: Charlotin's public database records tool attribution only where a court order, brief, or reporting on the matter states it explicitly; "unidentified" or "implied" means the record indicates AI use but does not name a specific product — we do not guess.

Outcome

Admonishment; Monetary Fine; 4 hours live CLE; Order Circulation (monetary penalty: 1001 USD.)

How Citation Safe would have caught this

Citation Safe runs three deterministic layers before a brief is filed: (1) does the citation exist against CourtListener's database of published opinions, (2) if quoted, does that exact language appear in the source, (3) does the cited case actually support the proposition it is cited for. Fabricated case citations fail Layer 1. Fabricated or misattributed quotations fail Layer 2 even when the underlying case is real. Misrepresented holdings — a real case cited for a proposition it does not support — are the target of Layer 3. None of these checks involve asking another language model whether the citation looks right; they are lookups and text-matches against the actual source, which is why a hallucinated citation has to survive a direct lookup against the authoritative source — not another model's opinion — to earn a VERIFIED stamp; our measured false-verify rate is published live at /quality.

Check a brief before you file it → · See our live false-verify rate

Source: https://www.damiencharlotin.com/documents/2039/Hill_v._Workday_USA_28_April_2026.pdf, via Damien Charlotin's public AI Hallucination Cases Database (CC0).

Source: https://www.damiencharlotin.com/documents/2039/Hill_v._Workday_USA_28_April_2026.pdf

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