European Courts Draw Hard Line: Judges Using ChatGPT Face Fines and Discipline

A Spanish provincial court judge has been fined €1,000 for incorporating ChatGPT-generated content into a judicial ruling without proper oversight, marking one of Europe's first formal sanctions for AI misuse in the courtroom. The Spanish General Council of the Judiciary (CGPJ) determined the conduct constituted a serious infraction under judicial conduct law—not for using artificial intelligence itself, but for disclosing case information through unauthorized external channels.

Why This Matters

• Legal precedent: This is among the first concrete disciplinary actions in Europe against a magistrate for improper AI use, signaling that judicial bodies are willing to enforce sanctions.

• New rules in force: Spain's 2025 instruction explicitly forbids judges from outsourcing judicial reasoning to AI tools not vetted by official authorities.

• Regional context: Portugal, Italy, and other EU member states have launched similar investigations, with Portugal's Supreme Court already confirming disciplinary proceedings for "gross negligence" involving phantom case citations generated by AI.

• Practical impact: Judges across the Iberian Peninsula and wider EU now face clearer red lines on what constitutes acceptable AI assistance versus prohibited automation of judicial functions.

The case came to light because the magistrate forgot to remove ChatGPT's own prompts and responses from the final text of the ruling before filing it with the court registry, according to the Spanish daily El Español. The blunder exposed that the judge had fed case files into the commercial chatbot and then presented the AI-drafted resolution to fellow tribunal members as if it were his own legal analysis.

What the Disciplinary Commission Decided

The CGPJ's disciplinary panel ruled by majority vote to impose the fine under Article 418.8 of the Organic Law of the Judiciary, which classifies as a serious offense the act of "revealing, outside established judicial information channels, facts or data learned in the exercise or on the occasion of judicial duties."

The panel explicitly rejected a harsher penalty proposed by the disciplinary prosecutor, who had sought a 15-day suspension and a €501 fine on grounds of "unacceptable ignorance in the performance of judicial functions"—a much graver charge. The commission concluded that the judge used ChatGPT "as aid and complement, but not as a substitute for judicial functions," stopping short of finding that he had abdicated his role entirely.

Spain's Public Prosecutor's Office, meanwhile, argued the facts did not warrant any disciplinary sanction at all and requested the case be closed. The compromise outcome—a €1,000 fine—reflects the judiciary's attempt to draw a line between experimental use of emerging tools and outright negligence in safeguarding judicial data and independence.

The Instruction That Changed the Game

The CGPJ approved a binding directive that sets explicit boundaries for AI use in Spanish courts. The instruction warns that artificial intelligence cannot issue rulings, assess evidence, or apply law without "real, conscious, and effective constant human supervision."

Key provisions include:

• No substitution: AI systems may not replace judges in decision-making, fact evaluation, or legal interpretation.

• Authorized tools only: Magistrates may only use AI applications provided or explicitly cleared by competent justice administrations or the CGPJ itself, following quality and audit controls.

• Data protection: Uploading case files to external commercial platforms—such as ChatGPT—is expressly forbidden, as it risks breaching confidentiality and the General Data Protection Regulation (GDPR).

• Bias prevention: Systems must be monitored for algorithmic bias, and any AI-generated content must undergo full personal and critical review before incorporation into a judicial document.

• Disclosure obligation: Some member states, including Portugal, now require judges to explicitly declare in the ruling if AI was used as an auxiliary tool.

Spain's directive aligns with the EU AI Act (Regulation 2024/1689), which classifies AI systems for judicial administration as "high-risk," triggering stringent obligations around transparency, human oversight, and conformity assessment. These rules enter full force in phases through 2026 and 2027.

A Pattern Across the Peninsula

Spain's case is not isolated. Portugal's judiciary has confronted similar infractions. The president of the Portuguese Supreme Court of Justice confirmed disciplinary proceedings against judges for gross negligence in AI use, with rulings citing non-existent legal precedents and incorrect statutory references. In response, Portugal's Superior Council of the Magistracy issued its own set of recommendations, emphasizing exclusive judicial responsibility and the requirement for express declaration of AI use in written judgments.

Italy recorded a related incident when a court in Florence issued a formal warning after a lawyer cited phantom case law attributed to AI "hallucinations." Although no formal charge was pursued, the Florentine bench underscored the duty of legal professionals to verify all sources.

Meanwhile, federal judges in the United States admitted that their staff had used AI to draft court orders later found "riddled with errors," prompting calls for tighter regulatory guidance. The phenomenon is global, but Europe's tightly integrated legal framework—anchored by the Council of Europe's 2018 Ethical Charter on AI in Justice and the new EU AI Act—has enabled faster, more coordinated responses than jurisdictions with less centralized oversight.

What This Means for Judicial Practice and Residents

For anyone involved in legal proceedings in Spain, Portugal, or elsewhere in the EU, the message is clear: judicial decisions must remain human. AI may assist with research, document classification, anonymization, and drafting internal notes or preliminary outlines, but the final reasoning, fact-finding, and legal interpretation are the exclusive province of the magistrate.

From a practical standpoint, this means:

• Transparency: Expect to see explicit mentions in future rulings if a judge used AI tools for auxiliary tasks.

• Accountability: Judges who delegate reasoning to unauthorized commercial platforms risk fines, suspension, or more severe disciplinary action.

• Data security: Court systems are transitioning from generic commercial chatbots to publicly controlled, audited platforms. In Spain, the Judicial Documentation Centre (CENDOJ) already operates the Kendoj system, an isolated AI environment designed specifically for judicial tasks like anonymization and precedent comparison.

• Quality control: Legal professionals—including lawyers—should verify every citation and legal reference, as AI-generated content can fabricate non-existent statutes or case law.

The Broader European Framework

The European Commission for the Efficiency of Justice (CEPEJ) issued updated guidelines specifically addressing generative AI in courts. These reinforce that jurisdictional power remains the sole responsibility of judges, and that any content produced by AI is merely auxiliary and never binding. The guidelines recommend a shift away from commercial tools toward specialized, publicly supervised solutions, and they warn explicitly about the risk of "hallucinations"—fabricated information presented as fact.

Under the EU AI Act, high-risk judicial AI systems must undergo conformity assessments, maintain detailed technical documentation and activity logs, ensure data quality to mitigate bias, and allow for human override at all stages. Spain's draft Law on Good Use and Governance of Artificial Intelligence designates the CGPJ's Data Protection Supervision and Control Directorate as the market surveillance authority for high-risk judicial AI, giving it teeth to enforce compliance.

Looking Ahead

The €1,000 fine imposed on the Spanish judge is modest in monetary terms, but its symbolic weight is considerable. It signals that European judiciaries are moving from principle to enforcement, translating ethical guidelines and regulatory frameworks into concrete disciplinary action. As AI adoption accelerates across administrative and judicial functions, the line between lawful auxiliary use and unlawful delegation of judgment will be tested repeatedly.

For residents and legal practitioners across the EU, the takeaway is straightforward: trust the judge, not the algorithm. AI can streamline research and reduce drudgery, but it cannot—and must not—replace the human judgment that underpins the rule of law. Anyone with concerns about potential AI misuse in judicial proceedings can now point to binding instructions, enforceable regulations, and a growing body of case law establishing that the courtroom remains a human domain.