What Is an Expert Witness?
An expert witness is someone qualified by knowledge, skill, experience, training, or education to give opinions on a technical subject. Ordinary witnesses can only say what they saw or heard. Experts may explain what the facts mean.
Under Texas Rule of Evidence 702, expert testimony is allowed when it will help the jury understand the evidence or decide a fact in dispute.
When Is an Expert Witness Needed?
Experts are most useful when a question goes beyond common knowledge. That often includes:
- Disputed fault, such as speed, braking, or sight lines in a crash
- Medical causation, when the defense blames a prior condition
- Permanent injuries that need future care
- Lost earning capacity after a disabling injury
- Professional standards, such as in medical malpractice
In Texas health care liability claims, Chapter 74 of the Civil Practice and Remedies Code requires the plaintiff to serve an expert report early in the case.
Types of Expert Witnesses
Common experts in injury cases include:
- Treating doctors and other physicians on diagnosis, cause, and prognosis
- Accident reconstructionists on how a crash happened
- Life care planners on the cost of future treatment and support
- Vocational experts on the ability to work
- Economists on the present value of lost wages and future costs
- Engineers on product defects or unsafe property conditions
- Trucking safety experts on federal hours-of-service and maintenance rules
How Experts Affect Your Claim
Strong expert testimony can help you meet your burden of proof and support the full value of economic damages, such as lost earning capacity. Insurers take note when a claim is backed by credible experts.
Experts can be challenged. The judge acts as a gatekeeper and may exclude opinions that are unreliable. Choosing qualified experts early and giving them complete records matters. A free case review can help you learn whether your claim may need one.
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Frequently Asked Questions
What is the role of an expert witness in a trial?
An expert explains technical facts the jury could not judge on its own, then gives an opinion based on that knowledge. For example, a reconstructionist may testify about vehicle speeds, or a doctor may testify that the crash caused a spinal injury. The jury decides how much weight to give the testimony.
Does every personal injury case need an expert?
No. Many simple claims settle on medical records and the crash report. Experts become important when fault is disputed, injuries are serious or long-term, or the defense argues an injury came from something else. Medical malpractice claims in Texas require an expert report early in the case.
What does a vocational expert do in a Texas injury case?
A vocational expert evaluates whether an injured person can return to their old job or other work, and what earnings they may lose. Their opinions often support claims for lost earning capacity in serious injury and wrongful death cases, usually alongside an economist who calculates the dollar value.
Can an expert witness be challenged?
Yes. The opposing side can ask the judge to exclude an expert whose qualifications are weak or whose methods are unreliable. At trial, the expert can be cross-examined, and the other side may call its own expert with a different opinion.