⚡ CASE DIGEST
Hang Zhang v. Daniel Driscoll — N.D. California, 14 January 2026
Pro se plaintiff Hang Zhang cited fictitious cases in her reply brief, then told the court the errors were ‘editing mistakes.’ Judge Araceli Martínez-Olguín found this ‘simply not credible’ — comparing the fictitious citations to properly formatted real ones — and held that Zhang had breached Rule 11 and then made it worse by certifying the fake cases as real.
Why it matters: This case adds a new dimension to AI citation misconduct: the cover-up is treated as a separate and aggravating breach. Courts are scrutinising explanations for fictitious citations with the same rigour as the citations themselves.
Category: Hallucinations & Sanctions | Jurisdiction: USA | Read time: 5 min
Case at a Glance
| Full Citation | Hang Zhang v. Daniel Driscoll, Case No. 25-cv-03381-AMO (N.D. Cal.) |
| Court | United States District Court, Northern District of California |
| Date of Decision | 14 January 2026 |
| Category | AI Hallucinations & Sanctions |
| Jurisdiction | USA |
| AI Tool Used | Implied AI tool use — court found ‘editing error’ explanation not credible |
| Judgment / Order | 2026 WL 99759 |
Background
Hang Zhang, proceeding pro se in the Northern District of California, filed a civil complaint against Daniel Driscoll. When she filed a reply brief, it contained citations to cases that did not exist in any legal database. The court issued an order to show cause. Zhang responded, claiming the fictitious citations were the result of ‘editing errors during preparation of my reply brief’ and appended two published circuit court opinions to show she could find real cases. The court found her explanation not credible.
The AI Issue
The court had to decide whether Zhang’s fictitious citations breached Rule 11 and whether her explanation for them was credible. Judge Martínez-Olguín compared the form and content of the fake citations to real cases Zhang appended and found them ‘too far apart to plausibly result from a mere drafting error.’ The court also found that Zhang had exacerbated her breach by certifying the fake cases as real and then making further false representations.
- Rule 11 violation found – ‘editing error’ explanation ‘simply not credible’.
- Exacerbated breach by certifying fake cases as real then making further false representations.
- Comparative analysis of ficktitious vs real citations used to dismiss explanation.
- Rule 11 duty applies to pro se litigants with same force as attorneys.
- Sanctions imposed – one of few pro se sanction cases for AI fabrications.
“Zhang’s representation regarding her erroneous citation to the fictitious cases in her reply brief is simply not credible.”
— Judge Araceli Martínez-Olguín, N.D. California, 14 January 2026
The India Angle
Indian Law Equivalent: Covering up AI citation hallucinations with false explanations constitutes additional misconduct under Bar Council of India Rules and the Contempt of Courts Act. The duty of candor to the court is absolute.
Quick Takeaways
- Covering up AI hallucinations with a false explanation is a separate and aggravating breach.
- Pro se litigants have the same verification duty as attorneys.
- If AI citations are discovered, full honest disclosure is the only appropriate response.