Pop Top Corp. v. Rakuten Kobo Inc.
U.S. District Court, Northern District of California · N.D. Cal. · California bar guidance
Conduct
Pro se judgment debtor cited nonexistent cases (Vargas, Hernandez-Rojas, Mickens) and a ChatGPT-generated transcript analysis.
Consequence
No monetary sanction; Rule 11(b)(2) warning that future fabricated citations may result in sanctions, citing Gjovik v. Apple.
Lesson
N.D. Cal. is sequencing AI sanctions: warning first (Pop Top), then monetary sanctions on repeat. Document the warning trigger.
Verified May 7, 2026
- Citation
- Pop Top Corp. v. Rakuten Kobo Inc., No. 20-cv-04482-YGR (DMR) (N.D. Cal. July 25, 2025) (Ryu, Chief Mag. J.)
- Decided
- July 25, 2025
Summary
Pro se judgment debtor Rohit Chandra filed post-judgment motions in Pop Top Corp. v. Rakuten Kobo Inc. that included citations to multiple fictitious authorities, including "In re Subpoena to Vargas," "Estate of Hernandez-Rojas v. United States," and "Mickens v. Waynesboro," all generated by AI tools and none of which exists. Chandra also submitted a ChatGPT analysis of deposition transcripts as substantive evidence without independent corroboration. Chief Magistrate Judge Donna M. Ryu issued a formal warning under Federal Rule of Civil Procedure 11(b)(2), citing Gjovik v. Apple Inc., 2025 WL 1447380, that "citations to nonexistent cases, or citation to existing cases for unsupported propositions, may result in sanctions, including monetary sanctions" in subsequent filings. The court reiterated that pro se litigants are subject to the same procedural requirements as represented parties for purposes of citation verification.
- AI tool:
- ChatGPT (implied)
What sanction did the court impose?
No monetary sanctions imposed in this order. Formal Rule 11(b)(2) warning that future fabricated citations or unsupported case propositions may result in sanctions, including monetary sanctions.
Why does Pop Top Corp. v. Rakuten Kobo Inc. matter for law firms using AI?
Pop Top is structurally significant because it cites Gjovik v. Apple Inc., 2025 WL 1447380, as authority for the verification standard, locking the two N.D. Cal. orders into a citable warning sequence. Chief Magistrate Judge Ryu treats the obligation to verify AI-generated citations as a Rule 11(b)(2) baseline applicable to pro se and represented filers alike, with the warning serving as a documented predicate for monetary sanctions on repeat conduct.
The order also addresses an underdiscussed AI failure mode: ChatGPT-generated analysis of deposition transcripts presented as substantive evidence. The court did not credit the analysis. For a managing partner running discovery in N.D. Cal., the operational implication is that AI-summarized transcript content, AI-summarized expert reports, and AI-distilled exhibit narratives are all subject to the same verification posture as case citations. The Pop Top warning is one-shot per litigant; the second instance is a sanctions motion with the warning order in hand.
Implications for your firm
Operational steps a firm reading this case may wish to consider documenting. Strategic and rule-application calls belong to your firm's attorneys.
- When opposing pro se litigants in N.D. Cal. post-judgment matters, surface fabricated citations early so any sanctions motion can show the Rule 11(b)(2) standard articulated in Pop Top has been met.
- Train staff to identify AI-generated transcript analyses or document summaries as separate verification risks distinct from fabricated case citations; both are addressed in the Pop Top order.
- Preserve copies of warning orders against opposing counsel or parties; subsequent sanctions motions in N.D. Cal. now build on the documented Pop Top / Gjovik warning sequence.
Sources
Primary sources
Further reading
- Specific tool identification: the order discusses 'AI tools' and references a ChatGPT-generated transcript analysis, but does not catalog every fabricated citation by tool. Treat tool name as 'ChatGPT (implied)' rather than 'ChatGPT (named)'.
- Identity of any sanctioned counsel of record beyond pro se judgment debtor Rohit Chandra not independently confirmed; the warning ran to Chandra's filings.