Legal research and verification
Legal AI authority checking and citation verification
Legal AI authority checking should verify that cited cases and legal propositions are supported by current public or licensed authority instead of treating a fluent citation as proof.
Quick answer
Citation verification is a separate problem from drafting. A legal AI system should preserve source-grounded matter analysis even if live authority research fails, then run an independent authority-verification step against a public-safe legal research brief and return reviewable sources and treatment.
Reviewed September 2026
Separation
Do not make legal research a single fragile model call
A long document-analysis request and a live legal-research request have different failure modes. If the research tool times out, the matter-grounded analysis should not disappear with it.
Sanctum separates matter analysis from Authority Check so the source-grounded answer can complete first and a dedicated search-capable route can verify the legal proposition independently.
Privacy
Research queries should not leak matter facts unnecessarily
A legal research worker often does not need the client's documents, witness names or confidential amounts. It can search from an abstract legal issue or proposition while the private matter context remains inside the governed analysis layer.
This separation reduces the amount of client information that needs to reach a public-law search tool and makes the boundary easier to explain to reviewers.
Treatment
A citation is only the beginning
Lawyers need to know whether an authority exists, whether the pinpoint supports the proposition, whether the case remains good law and whether a later court distinguished or reversed the relevant reasoning.
Authority verification should therefore surface URLs, court and date information, treatment context and an explicit verification state rather than a decorative citation badge.
Frequently asked questions
Why do legal AI systems hallucinate citations?
Language models can generate plausible-looking citations from statistical patterns. Verification requires retrieval against an authoritative source and comparison of the claimed proposition with the actual text.
Should authority research receive the whole client matter?
Usually not. A public-safe research brief can often capture the legal issue without exposing confidential names, documents or amounts to the search route.
What should happen if live legal research is unavailable?
The system should state that authority verification is incomplete while preserving any source-grounded document analysis that can still be supported from the matter record.
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