Why the right expert witness can make or break your injury case

When people picture an injury trial, they think of the lawyers. But in most serious cases, the witnesses who matter most are people who never saw the accident: the experts. Who they are, and how well they explain things, often decides what a case is worth, at the settlement table and in front of a jury.

What an expert witness is

Most witnesses can only tell the jury what they saw or heard. An expert is different. California law lets a person with special knowledge, skill, experience, training or education give opinions on subjects that are beyond everyday experience (Evidence Code §§ 720 and 801). A doctor can explain why your back still hurts two years later. A jury of teachers, retirees and warehouse workers cannot be expected to figure that out on their own.

The experts a personal injury case may need

• Medical experts explain your injuries, why the crash caused them, and what treatment you will need in the future.
• Accident reconstruction experts use photos, vehicle damage and vehicle data to show how the crash happened and who was at fault.
• Life care planners put a price on your future medical care, therapy, equipment and help at home.
• Economists and vocational experts calculate lost wages and lost earning ability.
• Medical billing experts explain what your medical care is reasonably worth.

Not every case needs all of these. A soft-tissue case may need only your doctor. A case with surgery or a permanent injury usually needs several.

Why experts matter before trial: settlement

Insurance companies settle cases based on what they think a jury would do. The insurer will hire its own experts, including a doctor to examine you, who may say your injuries are minor, existed before the crash, or have healed. If our side has no expert to answer them, the insurer has little reason to pay full value. When we can show qualified, credible experts ready to testify, the risk of trial shifts to the insurance company, and that is what moves settlement offers.

Timing matters too. Each side must formally disclose its trial experts before trial (Code of Civil Procedure § 2034.210 and following). An expert who is not disclosed on time can be barred from testifying, so this work has to start early.

Why the right expert matters at trial

Credentials get an expert in the door. They do not win the case. California juries are told they may believe all, part or none of an expert's opinion, and should weigh the expert's qualifications and reasons (CACI No. 219). When two experts disagree, jurors decide whom to trust.

Jurors trust the expert who teaches them.

The best experts:

• Speak plainly. “The disc between two bones in your lower back is torn and pressing on a nerve,” not a string of medical terms.
• Talk to the jury, not the lawyers. They turn, make eye contact and explain, the way a good teacher would.
• Use visuals. Models of the spine, scan images and simple diagrams make an injury real.
• Stay calm under cross-examination. They answer fairly, admit what they don't know, and don't get defensive.
• Stick to the records. Their opinions match the medical records and the facts.

Judges also act as gatekeepers. They can keep out an expert opinion that is speculative or not based on sound reasoning (Sargon Enterprises, Inc. v. University of Southern California (2012) 55 Cal.4th 747). A careful, well-prepared expert protects your case from that, too.

Hurt and wondering what your case needs?

At your first meeting, we will tell you which experts your case is likely to need and why. Call (562) 612-7806 any time or request a consultation.

• Sources: Cal. Evidence Code § 720
• Cal. Evidence Code § 801
• Cal. Code of Civil Procedure § 2034.210
• CACI No. 219, Expert Witness Testimony
• Sargon Enterprises, Inc. v. University of Southern California (2012) 55 Cal.4th 747

This article is general information, not legal advice. Every case is different, and past results do not guarantee a similar outcome.