Expert Witnesses in Personal Injury Cases: When You Need One

In a personal injury case, an expert witness can strengthen your claim and help you get more compensation. An expert witness can make the difference between a fair settlement and a lowball offer. Insurance companies and defense attorneys look for gaps in liability, causation, and damages to reduce payouts. Expert witness testimony is an important piece of the puzzle in many cases, helping close evidence gaps and setting you up for a fair settlement offer.

An experienced local personal injury attorney can help you determine whether your case needs expert testimony and, if so, what kind.

The Role of Expert Witnesses

Expert testimony generally supports three legal pillars in personal injury cases: establishing liability, proving causation, and quantifying complex, long-term damages.

If your case needs an expert, it is especially important to get legal representation early so experts have the best access to the evidence they need.

Establishing Liability

Expert witnesses help explain how an incident happened and who was at fault when the facts are technical or disputed. You can engage different types of experts to identify issues such as safety violations, explain industry practices, or outline professional standards of care.

The uses for expert witnesses are as unique as the cases they testify in.

Proving Causation

One of the most common reasons to engage a witness is to connect the incident directly to the injury — often the most contested part of a claim. Experts can be used to address common defense arguments, such as:

• Pre-existing conditions
• Degenerative changes
• Gaps in medical treatment
• Intervening events

A skilled attorney evaluates the case and selects the experts who best support it.

Quantifying Complex, Long-Term Damages

Gathering current medical bills as evidence of medical expenses is the easy part (as tedious as it may be). But expert witnesses can project costs that extend well beyond current medical bills. Other calculations must account for future expenses, so you’ll need information about broader types of damages, such as:

• Future medical care and rehabilitation
• Lost earning capacity and lost wages
• Long-term care and home modifications

Experts can turn future needs into a dollar figure that insurers and juries can understand when evaluating the calculations.

Credibility and Admissibility

Courts must evaluate experts before allowing them to present their findings to a jury or judge. They are screened for reliability using standards such as Daubert in federal court, or related standards in state courts.

The U.S. Supreme Court addressed the judge’s gatekeeping role in Daubert v. Merrell Dow Pharmaceuticals, Inc. Courts applying the Daubert factors may consider whether:

• A scientific theory or technique can be tested
• It has been subjected to peer review
• Its known or potential error rate
• Standards or controls govern the technique
• It has gained general acceptance

However, these factors are flexible. A judge doesn’t have to follow this outline exactly or consider every factor. Some states follow Daubert. Others use the Frye standard, from Frye v. United States, which focuses on whether the scientific principle or technique has achieved general acceptance in the relevant scientific community.

For that reason, the standard governing the admissibility of expert testimony depends in part on the court in which the case is heard.

Types of Expert Witnesses

Several types of expert witnesses are common in personal injury cases. Four types are discussed below. However, expert witnesses exist in many types of cases. The required type of expert witness depends on the case type and where evidentiary support is needed.

Medical Experts

In personal injury claims, medical experts are central. These medical professionals provide specialized knowledge about injuries after evaluating medical records or the patient. These experts can include:

• Physicians
• Surgeons
• Neurologists
• Orthopedists
• Psychiatrists
• Psychologists
• Other specialists

They can diagnose injuries and explain their nature and severity. They can also link the injuries to the incident to satisfy the legal causation requirement for a negligence theory and offer a prognosis for future treatment needs. In medical malpractice cases, they can testify to the relevant standard of care.

A retained medical expert is different from the treating physician. A treating physician is, as the name suggests, the medical professional who personally treated the injured person. The treating physician’s medical records become part of the personal injury case whether or not there’s an expert medical witness involved.

Accident Reconstructionists

Accident reconstruction experts are typically engineers, physicists, and specially trained law enforcement officers. They evaluate a car crash scene and analyze data such as skid marks, vehicle damage, event data recorders, and video footage.

Using this accident-scene data, they can determine speed, angles of impact, sight lines, and the sequence of events. If needed, they may create diagrams, models, or animations of motor vehicle accidents and other accident scenes to explain how the incident occurred.

Vocational Experts

Vocational rehabilitation specialists and employment specialists assess how injuries affect the injured party’s ability to return to a former job or work at all. They also evaluate transferable skills, retraining options, and realistic job prospects.

The findings can support lost earning capacity claims. A vocational expert is especially helpful for catastrophic injuries and injuries that require permanent restrictions.

Forensic Economists

A forensic economist is a type of financial expert who can utilize their expertise to calculate damages like:

• Lost wages
• Lost benefits
• Diminished earning capacity over a lifetime

These economic experts can put a present-day value on future medical and life care costs by accounting for inflation, discount rates, and life expectancy. Forensic economists generally build on the factual findings of vocational experts and life care planners. Together, the expert witnesses seek to present a complete financial picture.

When Expert Testimony Is Required

In some simple cases, expert testimony isn’t required because causation, damages, or liability may not be contested — or the law doesn’t require it. However, some cases require testimony by law. In other cases, the law does not require expert testimony, but it can strengthen the case.

Medical Malpractice Claims

For medical malpractice claims, most jurisdictions require an expert to establish the standard of care and show how it was breached. To this end, many states require an affidavit or certificate of merit from a qualified expert before or shortly after filing the medical malpractice case. Without expert testimony, the medical malpractice case cannot move forward.

Complex or Permanent Medical Injuries

When a case involves a complex or permanent injury, such as a traumatic brain injury, spinal cord injury, or chronic pain, expert witness testimony is helpful. It is also relevant when the parties dispute whether the injury was linked to the incident or a pre-existing condition.

Disputed Liability

Conflicting accounts of how an accident occurred are common in personal injury litigation, as each side argues its case. For example, in multi-vehicle collisions, commercial trucking accidents, or incidents involving technical safety issues, experts can help explain what caused the incident.

Product Liability Claims

In cases involving defective products, engineers or safety experts can testify regarding potential design or manufacturing defects.

Significant Long-Term Damages

Long-term or permanent injuries can create financial losses that require an expert. In high-dollar-value cases, insurers will scrutinize every future cost projection, including medical costs and claimed damages for pain and suffering.

Expert witnesses are not cheap. When warranted by the legal process, consider them an investment in the case’s outcome. Their fees generally make the most sense when the stakes and potential recovery justify the cost.

When Lay Witnesses and Treating Physician Notes Are Sufficient

In some cases, you don’t need to pay for an expert witness. Many claims settle out of court without retained experts when the issues are simple. You may not need to hire an expert witness in the following situations, and your personal injury lawyer can still make a strong case for damages.

• Clear liability cases
• Minor to moderate injuries with full recovery
• Well-documented, consistent medical records
• Straightforward economic losses
• Valuable lay witness contributions

Be mindful that case strategy can change during the case. If an insurer, for example, disputes causation or new complications arise, you may need expert testimony even though you did not need it at the outset of the case.

Consult a Personal Injury Attorney Who Can Evaluate Whether Your Case Needs an Expert Witness

Expert witnesses can be invaluable in your personal injury case as you seek fair compensation for your injuries. They can establish liability, prove causation, and quantify long-term damages. Working with an experienced personal injury attorney in your area who can take your case from start to finish will put you in a position to bring in experts when needed to build your case. Visit the Super Lawyers directory to get started.