Legal AI
Lexis+ AI / Protégé
Medium riskLexisNexis' generative AI research and drafting assistant, now sold as Lexis+ with Protégé, grounded in the Lexis primary-law and Shepard's citation database.
Is Lexis+ AI / Protégé safe for confidential data?
The data-handling story is reasonable — LexisNexis states customer data is not used to train public AI models, opted out of Microsoft's AI monitoring so OpenAI cannot access customer content, and purges uploaded documents after short inactivity windows. The documented problem is accuracy versus marketing: LexisNexis promoted Lexis+ AI as delivering hallucination-free linked legal citations, but the peer-reviewed Stanford RegLab study (Journal of Empirical Legal Studies, 2025) found it hallucinated on roughly 17% of queries — the best result among the major research platforms tested, but far from zero. Under ABA Formal Opinion 512 the lawyer, not the vendor, answers for a fabricated or miscited authority, so the tool is best treated as a fast first-pass researcher whose citations are always independently checked.
Risk by plan
The same product often carries very different terms depending on the tier — consumer plans are where the exposure concentrates.
Sold only under firm or organizational subscription; no consumer tier exists. Protégé personalization (Vault, remembered context) is user-controlled.
Data handling
Training on inputs
LexisNexis states customer data is not used to train public AI models and is not used to improve AI performance for other customers. There is no free consumer tier; all access is under subscription terms.
Retention
Uploaded documents can be deleted by removing the conversation thread, and LexisNexis states the system purges them after roughly 10 minutes of inactivity; confirm retention specifics for Protégé personalization features, which store more context by design.
Residency
Hosted with enterprise cloud providers (Microsoft Azure for the AI stack); LexisNexis does not publish a simple region-selection matrix for Lexis+ AI, so non-U.S. firms should confirm processing locations in their agreement.
Compliance
- SOC 2Not verified
- GDPR / DPANot verified
- HIPAA BAANot verified
Certifications typically apply to specific tiers and contracts — confirm scope in writing before relying on them.
New to these frameworks? See our plain-language guides to SOC 2 and the other AI compliance standards.
Enterprise controls
- SSO / SAML
- Opt-out of Microsoft/OpenAI monitoring and retention
- AES-256 encryption at rest
- User-controlled personalization and document deletion
- RELX Responsible AI framework with third-party audits
Frequently asked questions
What is the Lexis+ AI hallucination rate?
The Stanford RegLab study, peer-reviewed and published in the Journal of Empirical Legal Studies in 2025, measured hallucinations on roughly 17% of queries — the best score among the large legal research platforms tested, and about half the rate the same study measured for Westlaw's AI-Assisted Research. That is still roughly one answer in six containing a false or miscited statement, against marketing that promised hallucination-free linked citations.
Is Lexis+ AI accurate enough to rely on in filings?
Not without verification. Damien Charlotin's public database of AI-hallucination court decisions passed 1,600 cases in mid-2026, and ABA Formal Opinion 512 puts responsibility for verifying AI output squarely on the lawyer. Lexis+ AI links its citations to real documents, which makes checking fast — the discipline that fails is the checking itself, not the tool.
Is our exposure limited to Lexis+ AI if we license it?
Usually not. A licensed research platform does not stop lawyers and staff from pasting client facts into free consumer chatbots for quick questions, where no no-training commitment or DPA applies. Most firms pair the sanctioned platform with a policy and controls covering the unsanctioned tools, because that is where the confidentiality gap actually sits.
Policy changelog
- Initial entry published from LexisNexis' published security documentation and cited coverage.
Sources
- Stanford RegLab: Hallucination-Free? Assessing the Reliability of Leading AI Legal Research Tools
- Lexis+ AI security information (LexisNexis)
- ABA Formal Opinion 512 on generative AI
- AI Hallucination Cases database (Damien Charlotin)
This profile summarizes the vendor's published policies as of the verification date. It is not legal advice.
Lexis+ AI / Protégé is probably already in your organization.
Sanitized AI shows you who is using it and redacts sensitive data from prompts before it leaves your control.
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