We Had LLMs Hallucinating Legal URLs in Production — Here's What We Tried

The Production Bug We were building a RAG application over legal documents. Users ask legal questions, the system retrieves relevant law sections and court decisions, the LLM synthesizes an answer with citations. The citations are the whole point. A legal answer without a working source link is useless — worse than useless, because it looks credible. Then users started reporting broken links. When I dug in, I found two distinct failure patterns: Pattern 1 — Invented URLs. The LLM would...

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