A Historic Turning Point: Colombia’s Supreme Court Overturns a Ruling Based on Non-existent Citations and Warns About Unverified AI Use

By Castillo Grau Abogados

In November 2025, Colombia’s Supreme Court of Justice issued a landmark decision that is already reshaping conversations about judicial integrity and the responsible use of artificial intelligence in legal reasoning. Through its ruling STC17832-2025, the Court annulled a judgment from the Tribunal Superior de Sincelejo after determining that the lower court had grounded its decision on quotations purportedly taken from real Supreme Court precedents that, upon examination, did not exist within those rulings.

The case emerged from a civil dispute between two women in Sincelejo concerning the collection of a debt. The appellate tribunal had justified its decision by invoking passages allegedly contained in the judgments STC13560-2023 and STC4734-2025. When the Supreme Court reviewed the file, it found that the cited paragraphs were simply not part of the authentic texts. The Court described the situation as a severe motivational defect amounting to a vía de hecho, meaning that the lower tribunal violated the constitutional duty to provide a truthful, verifiable, and properly reasoned judicial decision.

Although the Supreme Court did not categorically state that the fabricated citations were produced by an AI system, it issued an explicit warning about the dangers of relying on automatically generated material without human verification. The ruling highlights that the rapid adoption of digital and AI-assisted tools in Colombian courts requires clear standards of verification, particularly in the citation of jurisprudence. The Court reiterated that judicial decisions must be supported only by authentic, identifiable, and reproducible sources.

The decision also provides procedural instructions to prevent similar incidents. The Supreme Court ordered the Council of the Judiciary and the Judicial School Rodrigo Lara Bonilla to circulate the ruling throughout the country, with the goal of strengthening training on proper legal citation, verification of jurisprudential sources, and the responsible use of technological tools. Additionally, the ruling reaffirms existing requirements on how judges must document the sources they rely on and clarifies that any future irregularities of this nature may result in the nullification of judicial decisions. The Court’s intervention has prompted discussions within the Colombian judicial branch regarding the development of internal protocols for tool-assisted drafting, standardized citation auditing mechanisms, and updated guidelines for digital legal research platforms.