Simplifying Expert Witness Research with Expert Research On-Demand

April 28, 2026 (4 min read)

There’s a moment that most litigators dread: you’re preparing to depose the other side’s expert witness, or your own expert is about to be deposed, and a damaging detail surfaces that you never saw coming. A prior inconsistent opinion buried in a transcript from eight years ago, a disciplinary action from a licensing board or testimony in a dozen similar cases that cuts directly against the position your expert is now being asked to defend.

These aren’t hypotheticals, they happen every day. And given that the vast majority of civil disputes settle before trial, the deposition is often the highest-stakes moment in the entire case for shaping damages, hardening positions or triggering deals. An expert who gets shredded in deposition often doesn’t get a second chance; the damage is already done.

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The expert witness blind spot

Whether a case settles or goes to trial, expert witnesses can make or break the outcome in a dispute. This is why expert witness vetting isn’t just a trial preparation task, it’s a core litigation strategy tool that matters from the moment that an expert is identified.

The problem often isn’t lack of diligence; it’s lack of access. Expert witnesses accumulate histories across years of testimony, hundreds of cases and multiple jurisdictions. That history lives in court records, deposition transcripts, unpublished rulings on motions to exclude, and disciplinary databases scattered across dozens of sources. No attorney has time to run all of that down manually … but the consequences of not running it down can be severe.

This challenge runs in both directions:

Litigators need to know whether their own expert is bulletproof before opposing counsel finds a crack in deposition; and

Litigators need to know everything possible about the other side’s expert before they sit down across the table from them or before they take the stand at trial.

“Expert witness research is central to litigation strategy. Critical expert history can significantly impact outcomes but is often difficult to access. EROD surfaces this information efficiently, delivering actionable insights that help attorneys evaluate experts with confidence and avoid surprises during deposition, motions, or trial.” -Eric Wright, Senior Vice President, LexisNexis

This is the research problem that Lexis®️ Expert Research On-Demand (EROD) was built to solve.

Beyond the CV: What a real vetting process looks like

EROD is a professional research service, not a database subscription, that puts experienced research analysts to work on a litigator’s specific request. The lawyer is not handed a login and left to search on their own, they submit a request and receive a packaged, curated report from LexisNexis.

These reports draw on a proprietary database of more than 488,000 expert witnesses, combined with access to more than 40,000 news sources and 92 billion public records through exclusive LexisNexis content holdings. That breadth is what makes the service capable of surfacing information that simply doesn’t show up in conventional research, such as unpublished rulings, hard-to-find deposition transcripts and disciplinary actions that never make headlines.

Types of expert witness reports available

The core report types address the most common litigation needs:

A Testimonial History Report maps an expert’s prior casework (e.g., how many times they have testified, in what types of cases and for which side);

Enhanced Challenge Reports leverage proprietary algorithms to compile and analyze the record of motions challenging that expert’s admissibility under Daubert, Frye or other standards; and

Disciplinary Action Reports surface professional sanctions and licensing board actions.

EROD can also compile articles and published writings by the expert, which can be valuable for identifying statements that cut against their anticipated opinions at deposition or trial.

The litigator’s strategic weapon

Most attorneys instinctively think of expert research as a tool for going after the other side’s witness. To be sure, that is a primary use case, but experienced litigators use it equally to protect their own experts.

Consider what opposing counsel is doing to prepare for your expert’s deposition. If there are inconsistencies in your expert’s prior testimony, gaps between their published writings and their anticipated opinions, or professional disciplinary history that could be exploited during deposition or trial, you want to know about it before opposing counsel does. EROD’s research capabilities work the same way regardless of whose expert you are examining.

The service is also particularly valuable in jurisdictions that limit discovery. In those situations, identifying who the opposing party has retained as an expert can itself require serious investigative work. EROD is a strategic weapon for identifying opposing experts even when disclosure has been restricted, giving litigators a meaningful head start on preparation.

Expert witness resources for litigators

Expert Research On-Demand is a transactional “pay as you go” service from LexisNexis that allows litigation teams to find and evaluate expert witnesses with the help of dedicated research analysts. Legal professionals request specific information about an expert and a LexisNexis research team will explore potential weaknesses, conflicts or other vetting criteria established in a confidential discussion.

EROD was recognized as a TechnoLawyer “Hot Product” for 2025. For pricing information or to register for a new account, get started here.

Expert witness research and vetting FAQ’s

How do you research an expert witness effectively?

Research goes beyond a CV and includes prior testimony, case history, and deposition transcripts. Review this record helps identify inconsistencies and potential risk. The goal is to be fully prepared before deposition or trial.

What should be included in an expert witness vetting process?

A strong vetting process includes testimonial history, admissibility rulings, publications, and disciplinary actions. This helps assess credibility and identify patterns that could impact performance. It ensures the expert can withstand scrutiny.

Why is expert witness research important in litigation?

Expert witnesses can influence strategy, settlement, and case outcomes. Missing a prior inconsistency or credibility issue can weaken your position. Early research helps avoid surprises and strengthens preparation.

Where can you find expert witness information?

Information is spread across court records, deposition transcripts, regulatory filings and new sources. These sources are often fragmented and time-consuming to search manually. Comprehensive research requires pulling from multiple data sets.

How do attorneys identify weaknesses in an opposing expert witness?

Attorneys analyze prior testimony, published work, and admissibility challenges. They look for inconsistencies, exclusions, or disciplinary history. These insights support stronger cross-examination and motion strategy.

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