How Vocational Rehabilitation Expert Witnesses Get Excluded Under Daubert — and How to Survive the Cross

Daubert is not a medicine problem. Under Kumho Tire and the 2023 amendment to Federal Rule of Evidence 702, the trial court's gatekeeping applies to every form of specialized testimony — vocational rehabilitation included. A 20-year study of 2,842 challenges to non-medical experts found that roughly half of those opinions were excluded or partially excluded, and the single most-cited reason was “unreliable methodology.”

The exclusion rarely happens in a written motion alone. It is built, piece by piece, in the deposition cross-examination — where opposing counsel walks a vocational rehabilitation expert into conceding scope, methodology, or an assumption that unravels the whole opinion. Here are the three traps, and how a prepared expert answers each one.

The three ways vocational rehabilitation experts lose ground

Scope: testifying outside your lane

The cross-examiner's question sounds simple:

You never met the plaintiff in person — your vocational assessment was based entirely on a records review and a phone call, correct?

Why it works: The foundation/scope attack. Don't let a remote assessment be framed as an in-person one — state your method and bound your conclusions to what it supports.

A stronger answer: “Correct. I conducted a structured telephonic interview and reviewed the complete medical and employment record. I noted that no in-person evaluation was performed and what that does and doesn't limit.”

Methodology: the reliability attack

The cross-examiner's question sounds simple:

Your lost-earning-capacity figure relied on wage data that was five years old at the time of your report, didn't it?

Why it works: Data-currency methodology. Stale data is an easy impeachment — name your source, its date, and any adjustment you made before they do.

A stronger answer: “I used the most recent published government wage data for that occupation and region, adjusted to present value, and cited the source and its date. Where more current local data existed, I incorporated it.”

Assumptions: the one premise that sinks the opinion

The cross-examiner's question sounds simple:

Your analysis assumed the plaintiff could work full-time — but the treating physician restricted him to part-time, correct?

Why it works: The unsupported-assumption trap — projecting earnings on a capacity the medical record doesn't support. Anchor to the restrictions in the record and label alternatives.

A stronger answer: “My primary opinion adopts the treating physician's restriction and is built on a part-time basis. I presented a full-time figure only as a labeled alternative if the restriction were lifted.”

How to prepare for the cross before you're sworn in

Every one of those traps is defeatable — but not by reading your report one more time. The experts who survive the cross have done three things:

• Rehearsed the cross-examination out loud, repeatedly, against a realistic examiner — so the scope concession, the methodology defense, and the assumption hedge are second nature.
• Mastered the record, so that when counsel asks them to recall the one line buried in thousands of pages of the medical and employment record, they can produce it in seconds rather than fumble.
• Stress-tested the report against FRE 702 — finding the reliability gaps before opposing counsel does.

Questions? Contact us at [email protected].