How to Present Conflicting Expert Opinions More Clearly at Trial
Both have impressive qualifications. Both refer to medical records. Both can explain their opinions in technical language that sounds convincing.
Now the jury has to decide what to make of it.
For attorneys, presenting conflicting expert opinions at trial is particularly challenging because the disagreement may involve details that aren't obvious to someone outside the profession. The difficulty isn't necessarily understanding what each expert believes. It's understanding why they disagree.
A useful presentation helps jurors examine those differences without losing track of the underlying evidence.
Why Conflicting Expert Testimony Can Be Difficult to Follow
Expert disagreements aren't always straightforward.
Two engineers might agree on the measurements taken after a machinery accident but disagree about what those measurements indicate. Medical experts may interpret the same diagnostic images differently. Economists can reach substantially different damages estimates because they use different assumptions.
During testimony, these disagreements may become buried in terminology.
A juror might remember that one expert estimated a higher figure than the other without understanding the calculation behind either number.
Attorneys should identify the specific point of disagreement before deciding how to present it.
Is the dispute about the facts, the method used to analyze them, or the conclusions drawn from the results?
Those are different questions, and each requires a different explanation.
Identify What the Experts Actually Disagree About
Suppose two accident reconstruction experts are evaluating a collision.
Both agree where the vehicles came to rest. They also agree on the roadway measurements.
However, they calculate different pre-impact speeds because they use different assumptions about braking and vehicle movement.
A lengthy comparison of their entire reports could overwhelm the jury.
A focused presentation identifying the disputed assumptions would be more useful.
Attorneys can use custom litigation graphics to illustrate relevant measurements, physical relationships, or technical findings.
The goal should be to isolate the disagreement rather than repeat everything the experts already agree upon.
That approach also helps attorneys prepare more precise questions during examination.
Use Comparison Charts Without Oversimplifying the Evidence
A side-by-side chart can make an expert disagreement easier to examine.
Consider an economic damages dispute. One expert estimates future lost earnings using a particular retirement age and projected wage growth. The opposing expert relies on different assumptions.
A comparison chart could identify those assumptions and their effects on the calculations.
Jurors would then have a reference while listening to testimony about the competing figures.
But comparison charts require restraint.
Selecting one sentence from a lengthy report can distort an expert's actual position. Attorneys should review quotations carefully and provide enough context to avoid misrepresenting either opinion.
TrialTemplate's litigation graphics and presentation services include visual formats that can help organize technical information and damages calculations.
A chart should make the disagreement understandable without pretending the underlying analysis is simpler than it is.
Explaining Conflicting Medical Opinions
Medical testimony presents a particular challenge because experts may agree on a diagnosis but disagree about causation.
Imagine a personal injury case involving a lumbar disc abnormality.
The plaintiff's expert believes the accident aggravated the patient's condition. The defense expert believes the imaging findings primarily reflect degenerative changes.
Both opinions may involve the same MRI.
Rather than asking jurors to interpret the scan independently, attorneys can have the relevant medical expert identify the findings and explain their clinical significance.
TrialTemplate's medical illustration and colorization services can help clarify anatomical structures discussed during testimony.
The illustration should accurately reflect the medical evidence. It should not depict disputed causation as though it had been independently established.
Medical imaging may identify an abnormality without conclusively determining when it developed or what caused it.
That distinction often lies at the center of the disagreement.
Let the Methodology Become Part of the Explanation
Sometimes the real dispute isn't the conclusion. It's how the expert arrived there.
A structural engineer might rely on a particular testing method. Another expert may argue that the test conditions don't accurately represent what happened during the incident.
Simply displaying their opposing conclusions tells the jury very little.
A diagram explaining the testing arrangement, relevant measurements, or assumptions may help the witness discuss the methodological disagreement.
Under Federal Rule of Evidence 702, expert testimony must satisfy requirements involving qualifications, sufficient facts or data, reliable principles and methods, and their reliable application.
Visual presentations don't replace those requirements.
TrialTemplate's trial technology and expert presentation services include demonstratives prepared in coordination with testifying experts.
Each visual should reflect the methodology and opinions the witness can actually support.
Preparing Visuals for Cross-Examination
Cross-examination often requires a different presentation approach from direct examination.
An attorney may need to move between a report, deposition testimony, underlying calculations, and an earlier statement.
Having those materials organized can make questioning more focused.
For example, if an expert used one assumption in an initial report and a different assumption later, the attorney might display the relevant passages together.
The jury can then examine the difference while the witness explains it.
An interactive case presentation can help organize supporting documents and graphics for use during legal proceedings.
Attorneys should avoid building a visual that assumes an inconsistency exists before the witness has an opportunity to address it.
A difference between two statements isn't always a contradiction. Sometimes additional information explains the change.
Don't Turn Expert Disagreements Into a Design Contest
A polished graphic can make one opinion appear more authoritative than another.
That creates a risk.
Imagine displaying one expert's findings in a detailed illustration while presenting the opposing opinion as a few lines of plain text.
The difference in presentation could influence how the audience perceives the opinions, even if both deserve careful examination.
Attorneys should make sure the visual treatment doesn't distort the underlying comparison.
TrialTemplate's article on choosing between animations and static graphics discusses how different visual formats serve different evidentiary purposes.
When the disagreement concerns numerical assumptions, a table may work better than animation. If it involves mechanical movement, a properly supported technical illustration may be appropriate.
Help Jurors Evaluate the Evidence, Not Just the Experts
Jurors may naturally notice an expert's confidence, professional background, or manner of speaking.
Those qualities don't answer whether the expert's conclusions are well supported.
Attorneys can help by directing attention to the evidence and methods behind each opinion.
That may involve examining the records an expert reviewed, assumptions used, limitations acknowledged, or explanations for alternative findings.
TrialTemplate's article on trial demonstratives and litigation graphics discusses how visual materials can support the explanation of technical evidence.
The strongest presentation gives jurors a way to evaluate the substance of the competing opinions.
Keep the Final Presentation Focused
When experts disagree, it's tempting to respond with more documents, more charts, and more technical explanations.
That can make the disagreement harder to understand.
A better approach is to identify the few issues that genuinely separate the opinions and explain why those differences matter to the case.
Sometimes that requires a technical diagram. Sometimes it requires only two figures displayed side by side.
TrialTemplate works with attorneys to develop expert witness demonstratives, litigation graphics, and courtroom presentations. Legal teams preparing for disputed expert testimony can contact TrialTemplate to discuss the evidence and presentation requirements involved.
Frequently Asked Questions
How should attorneys present conflicting expert opinions at trial?
Attorneys should identify the precise disagreements, explain the supporting evidence, and distinguish differences in facts, assumptions, methodologies, and conclusions. Comparison charts and focused demonstratives may help jurors follow the testimony.
Can attorneys compare expert reports visually during trial?
Yes, subject to applicable evidentiary rules and court rulings. Charts may be used to compare relevant findings, calculations, or statements, provided they accurately represent the source material.
What makes expert witness demonstratives useful?
Expert demonstratives can make technical methods, calculations, anatomical findings, and other specialized information easier to understand. They should be accurate and reviewed by the relevant expert.
Can visuals help attorneys challenge an opposing expert?
Visuals may help attorneys examine inconsistencies, underlying assumptions, or methodological differences during cross-examination. Any comparison should remain faithful to the reports, testimony, and other supporting materials.