25 Sept 2025NetherlandsChatGPT (reported)
A master's student at the University of Groningen used an AI tool while preparing the reference list of his thesis. The examiner found many non-existent references, and on 25 September 2025 the Faculty of Economics and Business exam board declared all his work for the thesis course invalid for fraud, excluded him from the course for one year and told him he no longer qualified for a cum laude judgment. The university's examination appeals board upheld this on 31 March 2026. The student said he had only used an AI tool to categorise sources, giving it his existing reference list as input. On 12 August 2026 the Administrative Jurisdiction Division of the Council of State found that the references in the thesis text led to existing, relevant sources, that the AI had evidently garbled the student's own reference list, and that only carelessness, not fraud, had been shown. It annulled both decisions and ordered the thesis to be assessed again.
Core concern Medium reported severity
AI involvement supported · Causal attribution supported · 1 source · Added 02/11/2026
12 Oct 2026BrazilUnidentified AI tool
A labour court in Castro, Paraná (9th Region Labour Court), annulled a court-appointed expert's report after the employer, in a motion for clarification, reported a hidden sentence at the foot of a page instructing artificial intelligence to contest the report only superficially and not to question the files it cited, according to Diário de Justiça. The expert confirmed the text but said it came from teaching material about AI and was inserted by accident; the court's IT section concluded that it had been formatted deliberately to be invisible. The judge said AI had not been used to write the judgment and that the text did not directly influence it, but annulled the report, later submissions and the judgment, ordered a new examination by another expert without AI tools, fined the expert 5% of the value of the case for bad-faith litigation, cancelled the expert's fees and removed the expert from the court's register. The decision, dated 12 October 2026, can be challenged.
AI relation unknown Medium reported severity Regulatory Action
AI involvement reported · Causal attribution disputed · 1 source · Added 30/10/2026
1 Mar 2023 to 22 Jun 2023Event location unknownChatGPT
In a passenger's personal-injury suit against the airline Avianca in the US District Court for the Southern District of New York, an opposition brief filed on 1 March 2023 cited judicial opinions that did not exist. The court found that the lawyer who did the research had used ChatGPT, which fabricated the cases, and that when he asked the chatbot whether one of them was real it replied that it had supplied real authorities that could be found on legal databases. On 22 June 2023 the court found bad faith by the two lawyers, based on their conduct after the citations were questioned, and imposed a USD 5,000 penalty jointly on them and their firm, together with letters to the client and to each judge falsely named as an author of the fake opinions.
Core + contextual relations Medium reported severity Regulatory Action
AI involvement supported · Causal attribution established · 2 sources · Added 28/10/2026
22 Oct 2026FranceUnidentified AI writing tool (suspected)
On 22 October 2026 the urgent-applications judge of the Rennes administrative tribunal rejected a student's request, filed through a lawyer on 18 October, to suspend a university's June 2026 refusal to admit her to a psychology master's programme, finding neither urgency nor serious doubt about the refusal's legality. The judge also fined her 750 euros for an abusive request. The order gives as reasons that the request met neither condition, concerned a programme for which she manifestly lacked the level, and referred to other people's names in ways the judge read as stereotyped mass-produced appeals; it adds that the request mixed curly and straight apostrophes, used many em dashes and black round bullets, and had an ordered but repetitive argument, elements the judge called characteristic of text generated by a generative-AI tool such as Claude.ai. The order does not establish who drafted the request or whether AI was used; Clubic noted that a copy and paste from a word processor can leave the same traces.
AI relation unknown Low reported severity
AI involvement suspected · Causal attribution alleged · 2 sources · Added 28/10/2026
May 2023United StatesChatGPT
A Colorado lawyer who had recently moved into civil litigation used ChatGPT in April and May 2023 to find case law for a client's motion to set aside a judgment and cited three Colorado Court of Appeals decisions that did not exist, without reading or checking them. On the morning of the 5 May hearing he realised the cases were fabricated but did not tell the court or withdraw the motion, and when the judge raised concerns he falsely blamed a legal intern; six days later he filed an affidavit saying he had used ChatGPT. The judge denied the motion, said the denial did not rest on the invented cases, and ordered him to show cause why he should not be sanctioned and reported to attorney regulators. On 22 November 2023 Colorado's Presiding Disciplinary Judge approved a stipulation suspending him for one year and one day, with 90 days served and the rest stayed on two years' probation, for violating rules on competence, diligence, candour to the tribunal and honesty.
Core concern Medium reported severity Regulatory Action
AI involvement supported · Causal attribution established · 3 sources, 2 underlying accounts · Added 26/10/2026
Event date unknownEvent location unknownUnidentified AI tool
In a public post to r/jobs created on 24 October 2026, a software engineer with about three years of experience writes that, after three and a half months of assessments and eight interviews, they joined a well-known multinational company that they do not name. In the first week they were given a compliance training whose questions they found ambiguous, and they used the company's own internal AI tool to help, telling their manager, who they say was fine with it. The following Monday, the poster writes, HR joined their one-to-one meeting and told them they were being let go for using AI on the training; the call lasted a couple of minutes and they lost access shortly afterwards. The poster says that a month later about 400 applications and more than 150 cold emails had brought almost nothing back and that they are stressed. The employer, its location and the date of the dismissal are not stated. The account is the poster's alone and uncorroborated; no employer statement was retrieved.
Core concern Medium reported severity
AI involvement reported · Causal attribution alleged · 1 source · Added 25/10/2026
20 Oct 2026BrazilUnidentified document-analysis tool
On 20 October 2026 the First Panel of Brazil's Superior Court of Justice (STJ) ordered the lawyers acting in a special appeal (AREsp 3.095.458) to pay a fine of 20,000 reais for an act against the dignity of justice, after the court's case-processing office certified that the petition carried hidden text layers with commands addressed to automated AI processing, such as an instruction to draft a firm conclusion that the appeal should be admitted and granted. The panel also ordered a technical report on the concealment techniques and the communication of the case to the Brazilian bar (OAB) and the Federal Public Prosecutor's Office. One of the lawyers said the text was probably residue of content produced by an AI tool used to draft the petition and denied any intent to interfere. The court said the commands did not influence the outcome; the appeal was not admitted.
AI relation unknown Low reported severity Regulatory Action
AI involvement reported · Causal attribution established · 2 sources · Added 22/10/2026
21 Oct 2025 to 3 Apr 2026United StatesCoCounsel
In a published opinion of 3 April 2026, the U.S. Court of Appeals for the Sixth Circuit addressed the briefs a lawyer appointed under the Criminal Justice Act had filed for an indigent defendant appealing a sentencing enhancement in a drug-trafficking case. The court noticed that the principal brief's file name was 'CoCounsel Skill Results' and found three quotations that appear in no legal authority and misstatements of two precedents. The lawyer admitted that a staff member had used Westlaw's CoCounsel to create the first draft, that he repeated the process for the reply, and that the false quotations came from artificial intelligence he did not verify. The court denied him compensation for the appeal, referred the opinion for possible disciplinary proceedings and to the Kentucky Bar Association, and by separate order removed him, locked his briefs and ordered replacement counsel to file new ones, which it said further delayed resolution of the defendant's appeal. The court acknowledged his candour and his 40 years without discipline.
Core + contextual relations Medium reported severity Regulatory Action
AI involvement supported · Causal attribution established · 3 sources, 2 underlying accounts · Added 19/10/2026
15 Jul 2026United StatesUnidentified AI drafting tool
In a published opinion of July 2026, the Arizona Court of Appeals found that a self-represented appellant's opening brief in a probate dispute contained eight citations, six of them deficient, including two cases that do not exist. In a written explanation and at a hearing on the false citations he acknowledged relying on generative AI to write the brief and said he did nothing to verify the citations. The court struck the inaccurate and false citations, rejected the appeal because no supportive authority remained, held that citing a hallucinated case is sanctionable whether or not it is intended, and ordered him to pay the share of the other party's attorney's fees traceable to the fake citations. Because he said he did not intend to deceive and is not legally trained, the court chose this narrow sanction over contempt or fines. It described the opinion as the first published Arizona ruling on generative AI hallucinations in filings.
Core + contextual relations Low reported severity Regulatory Action
AI involvement supported · Causal attribution established · 1 source · Added 18/10/2026
6 May 2026United StatesClaude Console (reported)
In the federal lawsuit over the Trump administration's mass layoffs (AFGE v. Trump, Northern District of California), a partner at Binnall Law Group filed an emergency motion on the night of 6 May 2026, in the Eastern District of Virginia, to quash a deposition subpoena directed at a former Homeland Security official the firm represents; that court transferred the motion to the Northern District of California. On 13 May Judge Susan Illston denied the motion. Her order says the court was troubled by multiple citations to case quotations that do not exist in the cases cited, that counsel was unaware of these quotations when questioned at the hearing and had no explanation for them, and it ordered counsel to explain the fabricated quotations in a declaration under penalty of perjury by 15 May. In that declaration the partner said he had used Claude Console, an enterprise AI platform, to create an initial draft, that an associate told him she had checked the citations, and that he did not double-check the quotations. He apologised to the court and opposing counsel and attached a corrected version. The firm's founding partner declared that firm policy prohibits using tools like Claude for legal drafting, that the error breached its policies and training, and that the firm had opened an internal investigation. On 20 Oct 2026 the court administratively closed the related miscellaneous case, saying the motion had been adjudicated and no further filings were anticipated. Neither order read mentions a sanction, and whether one was imposed is not established.
Core concern Low reported severity Internal Action
AI involvement supported · Causal attribution supported · 4 sources, 3 underlying accounts · Added 18/10/2026
Aug 2026United StatesUnidentified document-analysis tool
In a memorandum of decision issued in early August 2026, a Connecticut Superior Court judge found that a motion for default and a notice filed on 24 July 2026 by a self-represented plaintiff, in a suit against a healthcare provider over access to records, carried text in tiny white type that was invisible to a human reader but legible to software. The concealed text told any AI model reviewing the filing to make its output agree with the filing and to work toward reversing the Chief Clerk's denial of his default request. After the court gave notice of a sanctions hearing, he hid further messages in later filings, which he said were jokes. The court treated the first instruction as a prompt injection, did not believe his explanation that he was auditing the court's use of AI, and rescinded his ability to file electronically, so that future filings must be made on paper at the clerk's office; Ars Technica reports that no monetary penalty was imposed. The court said the Connecticut Judicial Branch does not use AI to review or decide filings and that the motion was denied on its merits from a printed copy, so the hidden text affected no ruling. The plaintiff told Reuters, according to Ars Technica, that his intent was to audit the court.
AI relation unknown Low reported severity Regulatory Action
AI involvement reported · Causal attribution established · 2 sources, 1 underlying account · Added 18/10/2026
29 Jan 2026NetherlandsUnidentified AI writing tool
A law student at Leiden University used a generative AI tool to spell-check his bachelor thesis and to check and order its reference list. Seven of the thesis's footnote references (one of them appearing twice, out of 36 footnotes with references) were wrong in the final version; according to his explanation, the tool had distorted some of them, for example with wrong years or author initials, and invented others. On 29 January 2026 the faculty's exam board declared the thesis invalid and excluded him until 28 January 2027 from the thesis track and every exam in the faculty's programmes, reasoning that the fictitious references indicated unauthorised use of generative AI and therefore fraud. The university's appeals board for examinations found in March 2026 that he had plausibly shown he used generative AI to prepare his reference list, which it called a permitted use, but held him responsible for the non-existent sources; the exam board then re-imposed the invalidation with an exclusion until 29 July 2026, and the appeals board upheld that in July. On 14 October 2026 the Administrative Jurisdiction Division of the Council of State (Raad van State) found his explanation plausible, held that no more than carelessness had been shown, and annulled the sanction; the thesis must now be graded, and the examiner may take the incorrect references into account in the grade.
Core concern Medium reported severity
AI involvement supported · Causal attribution supported · 2 sources, 1 underlying account · Added 17/10/2026
31 Mar 2026 to 11 Sept 2026United StatesIrys (reported)
A Los Angeles County Superior Court judge ordered a senior associate at Musick, Peeler & Garrett, the outside firm defending State Farm in a homeowner's lawsuit over a fire-damaged home, to pay a $999.99 sanction after the associate's motions in limine cited cases, quotations and holdings that did not exist, Law360 reported on 14 September 2026. In a declaration reproduced by Reason's Volokh Conspiracy, the associate said she used an AI program called Irys to prepare the motions, did not check some of the citations, and wrongly believed the program was cite-checked through the firm's Westlaw subscription; she confirmed seven non-existent case citations across eight motions. The plaintiff's lawyers found the citations and raised them at a status conference on 7 August 2026. The firm acknowledged citations that appeared to be AI hallucinations, and its lead trial counsel apologised to the court and the plaintiff. According to Law360, the judge had considered up to $5,000, and the amount set is one cent below the level at which California law requires a court to notify the State Bar.
Core concern Low reported severity Regulatory Action
AI involvement supported · Causal attribution supported · 4 sources · Added 17/10/2026
May 2026BrazilGalileu
In May 2026 a judge of the 3rd Labour Court of Parauapebas, in the Brazilian state of Pará, fined two lawyers about R$84,000 after text in white font on a white background was found in a document they filed for a worker in a labour claim. According to the sentence as reported by G1, the hidden text was detected while the judgment was being drafted with Galileu, a generative AI tool the labour courts use to help judges and staff draft sentences, and its evident intention was to make the AI produce a superficial defence or a compromised draft judgment. The judge called the technique prompt injection. The lawyers said they disagreed with the decision and that there was never any command to manipulate the judge's decision, describing the text as an attempt to protect their client from the AI; one of them said she did not work on labour cases. In October 2026 the regional labour court announced that a Connecticut Superior Court judge had cited the decision when sanctioning a litigant for misuse of AI.
AI relation unknown Medium reported severity Regulatory Action
AI involvement supported · Causal attribution disputed · 3 sources, 2 underlying accounts · Added 16/10/2026
11 Dec 2025NetherlandsUnidentified AI writing tool (suspected)
On 11 December 2025 an examination board at Maastricht University found that a European Law School student had committed fraud in a weekly assignment whose purpose was to find and correctly cite legal sources. The board said three of the four sources contained wrong journals, years, titles and page numbers, that the sources did not exist, and that the way they were included pointed to the use of AI; it concluded the student had made unauthorised use of AI. The sanction was a formal warning in the student's file, invalidation of all assessment components of the course and exclusion from the resit. The student argued that no technical analysis or AI-detection tool had been used, that she was never asked whether she had used AI, and that the errors came from completing the work in a hurry from memory and notes with a poor internet connection. The university's examination appeals board rejected her appeal on 5 March 2026, and on 12 August 2026 the Administrative Jurisdiction Division of the Council of State dismissed her further appeal and her claim for damages for reputational and psychological harm.
AI relation unknown Low reported severity Lawsuit Dismissed
AI involvement suspected · Causal attribution supported · 1 source · Added 16/10/2026
21 Nov 2025United StatesUnidentified AI drafting tool
On 25 September 2026 a judge of the U.S. District Court for the District of Massachusetts granted a defence motion for sanctions under Federal Rule of Civil Procedure 11 against a California-barred lawyer admitted for one case (pro hac vice) to represent the plaintiff. The court found that an opposition the lawyer filed on 21 November 2025 was replete with inaccurate citations, including a quotation attributed to a case with a fictitious Westlaw citation, and that later oppositions cited a non-existent case. In response to the court's order to show cause, the lawyer admitted using AI to draft the first opposition and explained a belief that the enterprise-level AI software in use did not hallucinate cases. The court revoked the lawyer's pro hac vice admission and ordered the lawyer's firm to pay the defendants' reasonable fees and costs, capped at $10,000. The order does not name the AI product.
Core concern Medium reported severity Regulatory Action
AI involvement supported · Causal attribution supported · 1 source · Added 16/10/2026
14 Sept 2026BrazilUnidentified document-analysis tool
A São Paulo business and arbitration court found that every page of a defendant's written defence carried a hidden instruction, placed above his lawyer's letterhead, asking any AI that analysed the petition to give a favourable opinion and praise the lawyer's probity and care. In a sentence dated 14 September 2026 the judge treated this as prompt injection and bad-faith litigation: although the defendant won on the merits, he was ordered to pay the plaintiff a fine of 9% of the updated case value, and the sentence was sent to the São Paulo bar to examine the lawyer's conduct. No source says any AI system read the instruction.
AI relation unknown Low reported severity Regulatory Action
AI involvement reported · Causal attribution established · 2 sources, 1 underlying account · Added 16/10/2026
5 Feb 2026 to 9 Oct 2026United StatesvLex, Paxton AI and NotebookLM (reported)
In a federal trademark suit in the U.S. District Court for the Southern District of New York, the court on 5 February 2026 struck a company defendant's motion papers and entered default judgment against it as a sanction on its lawyer, after his filings repeatedly cited nonexistent cases and misattributed quotations. The lawyer said he had found and cite-checked cases with AI tools (vLex and Paxton AI) and used NotebookLM to review a later submission; the court rejected his explanations and found he acted in bad faith. On 9 October 2026 the court described the citations as produced by generative AI and ordered the lawyer to pay $38,877.59 in fees and costs to the firm of a co-defendant's former lawyer, who had reported the false citations to the court.
Core + contextual relations Medium reported severity
AI involvement supported · Causal attribution established · 2 sources, 1 underlying account · Added 16/10/2026
31 Jan 2025 to 12 Dec 2025United StatesUnidentified AI drafting tool
On 12 December 2025 the U.S. District Court for the District of Oregon dismissed with prejudice the claims of plaintiffs in a family dispute over their late mother's estate and family property, as a sanction for what the court called their misuse of generative artificial intelligence, and found their continual violations of the court's Local Rules an additional basis for the dismissal. Three of the plaintiffs' summary-judgment briefs cited fifteen nonexistent cases and fabricated quotations attributed to eight real authorities. The plaintiffs had said the inaccurate citations came from reliance on an automated legal citation tool. The court found that the plaintiffs shared responsibility with their lead lawyer and that one plaintiff, a frequent self-represented litigant, was likely the person who used AI to draft the briefs. It struck the briefs, ordered the lead lawyer to pay $15,500 to the court and awarded the defendants their fees. In March 2026 it set those fees at $94,704.38, ordering the lead lawyer to pay 85% and local counsel 15%. In June 2026 it denied the plaintiffs' motion to reconsider a later ruling for the defendants on a counterclaim.
Core + contextual relations Medium reported severity Lawsuit Dismissed
AI involvement supported · Causal attribution established · 3 sources, 1 underlying account · Added 15/10/2026
7 May 2025 to 23 Jul 2025Event location unknownChatGPT
In an incarcerated man's lawsuit against Alabama prison officials in the US District Court for the Northern District of Alabama, two motions filed in May 2025 for the defence of a former Alabama corrections commissioner contained five citations that did not exist or did not support the propositions cited. Lawyers of the Butler Snow firm, which the state retains to defend its prisons, told the court that a partner had obtained the citations from ChatGPT and had not verified them. On 23 July 2025 Judge Anna M. Manasco publicly reprimanded three of the firm's lawyers, disqualified them from the case and referred the matter to the Alabama State Bar, and ordered them to give the order to clients, opposing counsel and judges in all their pending cases. She declined to suspend them and released the firm and two other lawyers without sanction.
Core concern Medium reported severity Regulatory Action
AI involvement supported · Causal attribution established · 3 sources, 2 underlying accounts · Added 15/10/2026