How to verify an expert witness in five minutes
A practical playbook for vetting an expert witness — yours or opposing — using public-records OSINT. The credentials lie, the prior-testimony record doesn't.
Expert-witness vetting is one of those workflows where the cost of skipping it is enormous and the cost of doing it manually is also large enough that nobody actually does it. Below is the five-minute version using public-records OSINT.
What you're looking for
Four things, in roughly this priority order:
**1. Credentials disputes.** The CV claims a board certification — does the actual board confirm it? The "PhD from Stanford" was a master's from a continuing-education program at Stanford. The "former FBI agent" was an analyst, not a special agent. These are the kind of distortions that surface in deposition and torpedo the witness's credibility.
**2. Prior testimony record.** Has this expert testified for the same party type 30 times in the last decade? That's a Daubert challenge waiting to happen. PACER + state court systems index expert testimony fairly well; you can pull the cases by witness name and look at the patterns.
**3. Conflicts of interest.** Board roles at companies that are parties or affiliates. Advisory positions at trade associations. Consulting work for adverse parties. Most of this is sitting in OpenCorporates and Companies House, free.
**4. Reputation issues.** Retracted publications. Sanctioned by a professional board. Public dispute with a co-author over data integrity. This is where adverse media + retraction databases earn their keep.
The five-minute playbook
Manual version: pull every claimed credential off the CV, open each issuing board's lookup tool in a tab, verify each one. Then PACER for the witness name in the last 10 years — pull the docket of every case where they testified. Note party type, outcome, retaining counsel. Then OpenCorporates + Companies House lookup on the witness's name + entity affiliations. Compare against your case's parties + their corporate families. Then adverse media scan + retraction database. Total: 60–90 minutes for a competent paralegal. Times the number of experts on the case.
The OSINT version: drop the witness's name + claimed affiliations into Tracelight, hit "run lookup", get a structured report with credential verification status, prior-testimony summary, COI section, and adverse media all in one place — usually in under 90 seconds. The citation appendix on every claim means you can verify any specific finding by clicking through to the source record.
What to do with the findings
The credentials disputes go straight into your impeachment outline. The prior-testimony patterns inform your Daubert posture (and may be enough to file a motion in limine). The COI section feeds your motion to disqualify if it rises to that level. The reputation timeline tells you what stories you'll need to anticipate on cross.
For your own expert: same workflow, different goal. You're surfacing the things opposing counsel will hit them with so you can decide whether to retain them, prep them, or pass.
What this isn't
Expert-witness vetting via OSINT is a complement to traditional credentials verification (calling the issuing board, checking the publication record), not a replacement. It catches the high-volume "is anything obviously wrong" tier of due diligence — which is the tier that, in our experience, gets skipped most often.
The legal value isn't in finding the smoking gun every time. It's in being able to tell your client that you ran the diligence, and showing your work. That's what the citation appendix is for.