Hang Zhang v. Daniel Driscoll
N.D. California · Jan 14, 2026
What happened in this matter?
The Court sanctioned a pro se litigant $500 for violating Rule 11 by submitting fictitious case citations in a reply brief and subsequently providing dishonest explanations to the Court regarding those citations.
- Why the court cared
- Fabricated: Case Law | Reply brief contains multiple citations the Court could not locate and characterized as fictitious/hallucinated; Court declined to reproduce the fictitious names to avoid repeating them. || Misrepresented: Case Law | Plaintiff cited a purported Fifth Circuit case for the proposition that courts 'credit unopposed constitutional arguments,' but the pincite corresponds to United States v. Santiago, 905 F.3d 1013, 1018 (7th Cir. 2018), a Seventh Circuit case that does not support the proposition cited. || Misrepresented: Case Law | Plaintiff cited a purported Ninth Circuit case for the proposition that constitutional claims 'almost always demonstrate' irreparable harm, but the pincite corresponds to Thompson v. D.C., 967 F.3d 804, 813 (D.C. Cir. 2020), which does not support that premise.
- Why it matters now
- This record documents a Pro Se Litigant filing issue in N.D. California, with the listed outcome: Monetary Sanction.
Why this matter is tracked
In Hang Zhang v. Daniel Driscoll, the U.S. District Court for the Northern District of California sanctioned a pro se litigant $500 for violating Rule 11 by citing fictitious case law in a reply brief. When ordered to show cause, the plaintiff initially claimed the citations were real but mischaracterized, then later attributed the errors to drafting mistakes. The Court found these explanations dishonest and not credible. The judge emphasized that Rule 11 duties apply to pro se litigants and warned that any future citations of fictitious cases would result in case-terminating sanctions. The Court also granted defense counsel leave to file standalone objections if further fictitious citations appear in future filings.
This record documents a Pro Se Litigant filing issue in N.D. California, with the listed outcome: Monetary Sanction.
Record details
What the record establishes about AI use
AI (implied, unspecified) is recorded in the source dataset; confirm the basis in the linked document.
Order issuing sanctions following a show cause proceeding.
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 | Reply brief contains multiple citations the Court could not locate and characterized as fictitious/hallucinated; Court declined to reproduce the fictitious names to avoid repeating them.
- Misrepresented: Case Law | Plaintiff cited a purported Fifth Circuit case for the proposition that courts 'credit unopposed constitutional arguments,' but the pincite corresponds to United States v. Santiago, 905 F.3d 1013, 1018 (7th Cir. 2018), a Seventh Circuit case that does not support the proposition cited.
- Misrepresented: Case Law | Plaintiff cited a purported Ninth Circuit case for the proposition that constitutional claims 'almost always demonstrate' irreparable harm, but the pincite corresponds to Thompson v. D.C., 967 F.3d 804, 813 (D.C. Cir. 2020), which does not support that premise.
Questions this record answers
- What happened in Hang Zhang v. Daniel Driscoll?
- The Court sanctioned a pro se litigant $500 for violating Rule 11 by submitting fictitious case citations in a reply brief and subsequently providing dishonest explanations to the Court regarding those citations.
- Why does Hang Zhang v. Daniel Driscoll matter for legal AI risk?
- This record documents a Pro Se Litigant filing issue in N.D. California, with the listed outcome: Monetary Sanction.
- What does the public record establish about Hang Zhang v. Daniel Driscoll?
- 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 Hang Zhang v. Daniel Driscoll 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.