What To Do If You Filed a Brief With a Fake Citation
If you filed a brief with a fake citation, verify every other authority in it, tell your client, and promptly tell the court in plain terms what is wrong, with a request for leave to file a corrected brief. Courts have said that candor matters here, and quiet fixes or evasive explanations have drawn heavier sanctions.
Key takeaways
- Duty of candor: ABA Model Rule 3.3(a)(1) bars failing to correct a false statement of material fact or law previously made to the tribunal, and Rule 3.3(c) says the duty continues to the conclusion of the proceeding.
- Disclose, do not just swap: in Williams v. Honl (Or. Ct. App. 2026) a motion to amend that never explained the fabricated law was held to lack candor.
- Evasion costs more: the Fifth Circuit in Fletcher v. Experian said it likely would have imposed lesser sanctions had counsel accepted responsibility and been more forthcoming.
- Audit the whole brief: one fabricated case usually means the same drafting process touched other citations, quotations and pinpoints.
- Paper the fix: keep a dated record of what was wrong, how you found it and what you corrected, because a show cause order may follow.
What should you do first if you filed a brief with a fake citation?
Freeze the brief and find out how big the problem is before you say anything to anyone outside the firm. In the first few hours, the goal is facts: which citations are fabricated, which are real but misquoted or misused, and which pinpoints and record cites are wrong.
A practical first-day sequence looks like this:
- Stop building on the brief. Do not cite it in a reply, a related motion or a filing in another case until it is checked.
- Pull every authority. Open each case, statute and rule from a reliable source, read the cited page and confirm it says what the brief says it says. The five-check method in our citation verification checklist works for this.
- Sort the problems. Separate nonexistent cases, real cases with invented quotations, real cases cited for propositions they do not support, and wrong pinpoints. Courts treat these differently, and so should your disclosure.
- Find the source of the error. Was it a generative AI tool, a template, a contract drafter, an outdated memo? You will be asked, and the answer has to be accurate.
- Tell the client. The client needs to know before the court or opposing counsel tells them.
- Check your obligations. Review your jurisdiction’s version of Rule 3.3, any judge-specific AI order in the case, and whether your professional liability policy requires notice of a potential claim.
CiteVerified verifies citations and does not give legal advice. Whether and how to notify a particular court, and how to talk to a client or carrier, are judgment calls for the attorney of record and, where needed, ethics counsel.
Do you have a duty to tell the court about a fake citation in your own brief?
Under the ABA Model Rules, yes, if the false statement of law is material. ABA Model Rule 3.3 says a lawyer shall not knowingly “fail to correct a false statement of material fact or law previously made to the tribunal by the lawyer,” and Rule 3.3(c) provides that the duties “continue to the conclusion of the proceeding.”
Most states have adopted some version of Rule 3.3, so check your own state’s text. Courts are also applying the candor duty directly to AI errors. In Williams v. Honl, 348 Or App 505 (2026), the Oregon Court of Appeals said that once the respondent’s brief exposed the problem, “the professional choice” would have been “to disclose to the court immediately that the opening brief contained fabricated law resulting from the use of generative artificial intelligence, and to have requested leave to file a rewritten brief.”
There is also a procedural reason. Federal Rule of Civil Procedure 11 requires that legal contentions be “warranted by existing law,” and Rule 11(c)(2) says a party’s sanctions motion must not be filed or presented to the court if the challenged paper is “withdrawn or appropriately corrected within 21 days after service.” That safe harbor applies to motions served by a party. It does not stop a court from acting on its own under Rule 11(c)(3), which lets the court order an attorney to show cause why conduct “has not violated Rule 11(b).”
Why is a quiet correction riskier than a full disclosure?
Because courts read an unexplained correction as a second candor problem layered on the first. In Williams, counsel moved to file an amended brief that, according to the motion, “corrects the legal standard and citations in light of Respondent’s answering brief.” The court found that “The motion that appellant’s attorney filed lacked the candor that we expect from lawyers.”
The Oregon court struck the opening brief, denied leave to file the amended version and awarded the respondent $8,044.25 in attorney fees payable by appellant’s attorneys. It also required that any new brief from the same attorney carry a certification that “counsel has verified that every source of law cited, quoted, or paraphrased exists.”
The Fifth Circuit made a similar point in Fletcher v. Experian Information Solutions, Inc., No. 25-20086 (5th Cir. Feb. 18, 2026). The court said that if counsel discovered the inaccuracies before its show cause order, “she should have immediately alerted the court and sought leave to file a correct brief.” It found her first response did not mention AI at all, called the response “evasive, misleading, and sanctionable,” and imposed a $2,500 sanction, adding: “Had Hersh accepted responsibility and been more forthcoming, it is likely that the court would have imposed lesser sanctions.”
What did Mata v. Avianca say about coming clean?
It said timing changes the record. In the Mata v. Avianca, Inc. Opinion and Order on Sanctions, No. 22-cv-1461 (PKC) (S.D.N.Y. June 22, 2023), Judge Castel wrote that “there is nothing inherently improper about using a reliable artificial intelligence tool for assistance,” but that “existing rules impose a gatekeeping role on attorneys to ensure the accuracy of their filings.”
The court then explained that “if the matter had ended with Respondents coming clean about their actions shortly after they received the defendant’s March 15 brief questioning the existence of the cases, or after they reviewed the Court’s Orders of April 11 and 12 requiring production of the cases, the record now would look quite different.” Instead, it found that counsel “doubled down.” The order imposed a $5,000 penalty jointly and severally and required letters to the client and to each judge falsely identified as the author of a fake opinion.
These three matters, along with the other entries, are summarized on the CiteVerified Sanctions Wall, which links to the public source for each entry.
What should the notice to the court say?
It should be short, specific and factual. In the opinions above, the courts criticized vague or incomplete explanations. A notice or motion for leave typically covers:
- What is wrong: each citation, quotation or pinpoint that is fabricated or inaccurate, identified by page of the filed brief.
- How it happened: an accurate account of the drafting process, including whether a generative AI tool was used. In Fletcher, omitting AI from the first response was part of what the court found misleading.
- What you checked: that every other authority in the brief has now been verified against the source, and by whom.
- What you are asking for: usually leave to file a corrected brief, and an offer to address any prejudice to the other side.
- What changes going forward: the verification step the firm has added. Keep this factual, not promotional.
Whether to call it a notice of errata, a motion for leave to file a corrected brief or something else depends on the court’s rules and the stage of the case. Check the local rules and any standing order of the assigned judge before filing.
What to do if you filed a brief with a fake citation and the court has not noticed?
The analysis does not change because nobody has caught it yet. Rule 3.3 turns on the lawyer’s own knowledge of a false statement of material law, not on whether opposing counsel has flagged it, and the opinions above suggest that courts give more credit to lawyers who come forward first.
Waiting is also a practical gamble. Opposing counsel and court staff check authorities. In both Mata and Williams, the problem was first raised in the opposing party’s brief, and by then the lawyer’s chance to come forward first was gone. More examples are on the Sanctions Wall.
How do you make sure the corrected brief is clean?
Treat the corrected brief as a new filing and verify it from scratch. A corrected brief that still contains errors is worse than the original, because the court has already been told it was fixed.
Use a check that someone other than the drafter performs, and record each authority as it is cleared. A red-flag entry from a pre-filing audit looks like this. The data below is fictional and shown only as an example of format.
| Field | Example entry (fictional) |
|---|---|
| Brief location | Opening brief, p. 14, line 9 |
| Citation as filed | Example Corp. v. Sample Co., 123 F.4th 456, 460 (9th Cir. 2024) |
| Finding | No case at this citation in the reporter; no matching case name located in any federal court |
| Category | Nonexistent authority |
| Proof | Screenshot of reporter page 456 and docket search results, saved as RF-03 |
| Severity | Red: must be removed or replaced before filing |
| Reviewer note | Same paragraph quotes language attributed to this case; quotation also unverified (see RF-04) |
Run the same review on every quotation, pinpoint, statute, rule, record cite and exhibit reference, not only on the case citations. Fabricated quotations attributed to real cases were the core problem in Williams, and a cite that resolves to a real case can still fail.
What should you keep in the file if a show cause order follows?
Keep a dated record of the discovery, the verification and the correction. If the court issues an order to show cause, the response will need specifics, and reconstructing them later is how inaccurate explanations happen.
| Keep | Why it matters |
|---|---|
| The filed brief and every draft | Shows where the error entered the process |
| The prompts or research notes behind the bad cite, if any | Supports an accurate account of how it happened |
| A list of every authority checked, with date and reviewer | Shows the rest of the brief was verified, not assumed |
| Screenshots or copies of the cited pages | Proves each corrected cite says what the brief says |
| Client communications about the error | Documents that the client was told |
| The firm’s revised verification step | Answers the question every court asks: what changes now |
Can a human citation audit help after a fake citation is filed?
Yes, for the verification part. When a brief is already under a cloud, the corrected version needs to be checked by someone who did not draft it, with proof for each entry. That is the work CiteVerified does.
Our reviewers check every case, statute, rule, quotation, pinpoint, record cite and exhibit reference, and return a manual audit log with screenshots, an annotated copy of the brief and a red-flag report. See what the audit covers. Brief Verification is listed at $249 per brief, with a rush option returned within 5 business hours for an additional $75, subject to submission completeness and brief size; details are on the pricing page. The service also lists an emergency correction memo.
CiteVerified is not a law firm. We verify citations and do not give legal advice; the attorney of record keeps responsibility for the filing and for every decision about what to tell the court. You can read more about the audit desk.
Frequently asked questions
Can you be sanctioned for a fake citation even if you did not know it was fake?
Yes. Courts have sanctioned lawyers who did not intend to mislead, because Rule 11 and its state counterparts require a reasonable inquiry before filing. In Mata v. Avianca the court said existing rules impose a gatekeeping role on attorneys to ensure the accuracy of their filings.
Does withdrawing the brief within 21 days avoid Rule 11 sanctions?
It can block a sanctions motion served by the opposing party, because Rule 11(c)(2) bars filing that motion if the paper is withdrawn or appropriately corrected within 21 days after service. It does not prevent the court from acting on its own initiative under Rule 11(c)(3).
Should I tell the court that I used AI to draft the brief?
If AI caused the error, courts expect an accurate account. In Fletcher v. Experian the Fifth Circuit faulted counsel for not mentioning AI in her first show cause response, and in Williams v. Honl the court said counsel should have disclosed that the fabricated law resulted from generative AI.
Is fixing the citation in an amended brief enough?
Not on its own. In Williams v. Honl the Oregon Court of Appeals held that a motion to amend that did not explain the fabricated law lacked candor, struck the brief and awarded fees. Pair any correction with a plain explanation of what was wrong.
What should I do if opposing counsel’s brief has a fake citation?
Verify it yourself against the source before raising it, then point it out to the court with specifics. Accuracy matters on both sides, so document what you checked and how.
Get the corrected brief checked before it goes back to the court
If you have filed a brief with a citation problem, or you are about to file a corrected version, upload the brief for a human citation audit. You will get back an audit log, screenshot proof and a red-flag report you can keep in the file.