Do Jurors Believe Defense Medical Experts? What Causation Focus Groups Reveal

Defense medical experts and causation: it’s one of the biggest worries I hear from plaintiff lawyers. I’ve run several causation focus groups recently, and the same anxiety comes up every time: “The defense has a board-certified expert with incredible credentials. Will jurors just blindly believe them?”

And it’s rarely just one expert. Often the defense hires two or three separate medical experts, each assigned to a different one of your client’s injuries.

Here’s what I’ve learned: you’re worried about the wrong thing.

Jurors Know Experts Are Paid

Jurors are much smarter than lawyers give them credit for. They know experts are paid for their opinions. All experts, including yours. They aren’t impressed by credentials alone.

Instead, jurors are asking:

• What is this expert basing their opinion on?
• Did they examine the patient, or just review records?
• Does their reasoning make sense?

One focus group participant put it perfectly: “The defense can go out and hire any medical expert that they want to try and sway our opinion.”

What Jurors Weigh More Than Credentials

In multiple recent focus groups, jurors gave more weight to other evidence than to the defense medical experts, even when the defense expert had better credentials on paper. That evidence included:

• Liability facts
• Property damage photographs
• The client’s initial complaints to the emergency room
• Follow-up doctor visits

And don’t forget about treating doctors. Jurors want to hear from the treater, not just the hired expert.

The Prior Injury Defense

In case you’re wondering: every one of the defense experts in these focus groups pointed to past injuries or a prior diagnosis to explain away causation. So we made sure to test that argument directly, using the client’s past medical records.

What to Test Instead of Credentials

Stop obsessing over the defense expert’s resume. Start testing what jurors actually care about:

• Does the defense expert’s reasoning hold up?
• How do jurors react to symptoms reported in the first medical records? And to your treating doctor?
• Do you actually need a competing expert, or just better presentation? Would a strong treating doctor deposition do the job? (This is where witness preparation pays off.)

In recent focus groups, I’ve watched lawyers discover that defense expert opinions fall apart under basic juror questions, and find out which causation arguments actually resonate. We tested a defense biomechanical expert who concluded no spinal injury could result from a car crash and the focus group ripped him up for relying on science journals and random experiments. The focus group was particularly upset the expert did not use the basic information of height and weight of the Plaintiff, which did NOT match the science journals or experiments. A majority of participants concluded every person is different and car crashes of all kinds can hurt a person – it’s very case specific determination.

You Can’t Learn This Sitting in Your Office

This is exactly why I offer virtual focus groups. Test your causation story early: before depositions, before you’ve committed to an expensive expert strategy, and before the defense locks you into fighting on their terms.

Early testing gives you time to adjust your strategy instead of scrambling at trial. And when it’s time to put it all together, trial consulting can help you build the case around what jurors actually believe.

Ready to find out what jurors really think about your experts and your causation story? Schedule a free consultation.