Hallucinations in Legal Content: Red Flags & Fixes

Hallucinations are confident-sounding fabrications. Legal prompting should reduce the chance of hallucination and make hallucinations easier to detect.

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How to reduce hallucinations up front

• Tell the model to use only provided text (for summaries/extractions).
• Require it to label assumptions and uncertainties.
• Ask for citations only when you provide a source set.
• Use retrieval (RAG) or a legal database workflow when possible.

How to detect hallucinations

Use the red flags chart above, and always spot-check against primary sources. If a case cannot be found, treat it as fabricated until proven otherwise.

A “verify-first” prompt pattern

List all citations and quotations you used. For each, include: source name, pinpoint cite, and a short quote.
If you are not sure, write: "UNCERTAIN" and do not guess.