How to Verify Legal Citations with AI and Avoid Hallucinations: Guide for Lawyers
AI hallucinations are the biggest risk for lawyers using ChatGPT or Copilot. Learn to detect them, avoid them, and how automatic citation verification works in Lexiel against BOE and CENDOJ.
The Case That Changed Everything
In 2023, a US lawyer submitted a brief citing six Supreme Court precedents. None existed. ChatGPT had invented them. The lawyer was sanctioned. The risk is identical in Spain.
What Is an AI Hallucination in Legal Context
A generative language model without access to verified databases doesn't "search" information, it generates plausible-sounding text based on statistical patterns. In legal context: citing judgments that were never handed down, inventing article numbers, citing repealed rules as current law.
The critical problem: the generated text sounds completely convincing. Correct format, correct numbering, correct legal language. No external signal that it's false.
How RAG Solves the Problem at Source
RAG (Retrieval-Augmented Generation): the system first searches verified sources (BOE, CENDOJ, TC), then generates text using only the retrieved fragments as source. The model can't invent what isn't in the database.
How Lexiel Citation Verification Works
Every text generated by Lexiel or pasted from another source can be submitted to verification. The system extracts legal references, checks each against official sources, and marks: ✅ Verified / ⚠️ Review / ❓ Unverifiable / ❌ Not found.
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