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Selecting an Expert Witness in Contemporary Litigation

  • Writer: Dr. Steven Ross, DC, FASBE, DAAPM
    Dr. Steven Ross, DC, FASBE, DAAPM
  • May 19
  • 7 min read

Updated: Jun 1

By Dr. Steven B. Ross, DC, FASBE, DAAPM

Chiropractic Physician | Fellow, American Academy of Applied Spinal Biomechanical Engineering | Diplomate, American Academy of Pain Management.


Expert witnesses now sit at the center of many technically complex cases, particularly when biomechanical or medical issues drive liability or damages. Courts increasingly demand that experts combine sound science, neutrality, and clear communication that meaningfully assists fact-finders (Kale, 2023; Shur & Robin, 2020; Martire & Montgomery-Farrer, 2020; Cooper et al., 1996).


The Strategic Role of the Expert

Judges and juries rely on experts to interpret evidence beyond lay knowledge, especially in medicine, genetics, biomechanics, and forensic science (Kale, 2023; Pergolizzi & LeQuang, 2024; Shur & Robin, 2020; Blackwell & Seymour, 2015; Cramer et al., 2014). Biomechanists integrate engineering mechanics with anatomy and physiology to reconstruct accidents and injury mechanisms, a method courts have found useful (Wilcox & NicDaéid, 2018).

Under Frye and now Daubert, trial judges serve as gatekeepers for scientific evidence, assessing whether opinions are grounded in testable methods, peer review, known error rates, and general acceptance rather than subjective impressions (Shur & Robin, 2020; Shenoy et al., 2022; Martire & Montgomery-Farrer, 2020; Cooper et al., 1996). Comparative work urges clear admissibility rules to distinguish scientifically based reports from unreliable or biased opinions (Odusote, 2025).


Core Pillars of Expert Credibility

Across jurisdictions and disciplines, several recurring dimensions of credibility emerge:

  • Methodological rigor and field match – Opinions grounded in validated, peer-reviewed science and appropriate to the expert’s field and specialty are more persuasive and more likely to be admitted (Kale, 2023; Odusote, 2025; Shur & Robin, 2020; Blackwell & Seymour, 2015; Miehe, 2024; Shenoy et al., 2022; Cooper et al., 1996).

  • Ability, consistency, and trustworthiness – Jurors and judges respond strongly to demonstrated personal proficiency, consistency with other experts and prior positions, and perceived objectivity (Blackwell & Seymour, 2015; Miehe, 2024; Prasyudhastyka & Probowati, 2025; Svider, 2021; DeMatteo et al., 2019; Wilcox & NicDaéid, 2018).

  • Experience and professional standing – Extensive relevant practice, ongoing clinical work, and publications aligned with standards of care are considered indicators of reliability (Kale, 2023; Pergolizzi & LeQuang, 2024; Kipoulas et al., 2024; Prasyudhastyka & Probowati, 2025; , 2018; Masella & Meister, 2001; DeMatteo et al., 2019).

  • Ethical neutrality – Professional guidance emphasizes unbiased, honest opinions, avoiding “opinions for hire,” and adhering to specialty codes of ethics (Pergolizzi & LeQuang, 2024; Kipoulas et al., 2024; , 2018; Engin, 2005).

Structured frameworks, such as the Expert Persuasion Expectancy (ExPEx) model, identify foundation, field, specialty, ability, opinion, support, consistency, and trustworthiness as logically relevant attributes for evaluating expert reports; weaknesses in ability, consistency, or trustworthiness can substantially undermine an otherwise strong report (Blackwell & Seymour, 2015).


What Jurors and Judges Actually Weigh

Empirical studies of jurors, magistrates, and mock jurors show that:

  • Real jurors in serious criminal or homicide trials prioritize education and years of experience over certification or accreditation, and assess credibility based on qualifications, confidence, demeanor, and clear explanations (Shenoy et al., 2022; Prasyudhastyka & Probowati, 2025; Kipoulas et al., 2024).

  • Jurors value experts they perceive as neutral, experienced, and clear, ranking relevant professional experience, lack of bias, and clarity even above academic degrees (Martire & Montgomery-Farrer, 2020).

  • Narrative testimony and demonstrative or visual aids deepen understanding and support acceptance of the expert’s conclusions (Kale, 2023; Shenoy et al., 2022; Martire & Montgomery-Farrer, 2020).

  • When testimony is highly complex, strong credentials and perceived expertise carry greater weight; when less complex, jurors rely more on the content itself (Masella & Meister, 2001).

Magistrates can distinguish high- from low-quality opinions when given information about field, specialty, ability, and trustworthiness. They are generally more skeptical of expert evidence than laypeople (Cramer et al., 2014).


Practical Vetting Considerations for Attorneys

Research‑aligned vetting typically includes:

  • Admissibility and exclusion history – Prior exclusions under Rule 702, Daubert, or Frye can be a significant concern at trial (Odusote, 2025; Shur & Robin, 2020; Shenoy et al., 2022; Cooper et al., 1996).

  • Balance of work and financial transparency – A heavily one-sided case mix and opaque fee structures can create perceptions of bias; ethical commentary highlights the dangers of financial incentives and “opinions for hire” (Pergolizzi & LeQuang, 2024; Kipoulas et al., 2024; , 2018; Engin, 2005; Masella & Meister, 2001).

  • Report quality and disclosure – Comparative analyses recommend that expert reports clearly set out the methodology, scientific basis, qualifications, literature relied on, and the facts within personal knowledge, and that they be open to cross-examination (Kale, 2023; Odusote, 2025).

  • Communication skills and demeanor – Research identifies two broad persuasion meta-factors:

    • Character (trustworthiness, likeability, knowledge, stable personality traits)

    • Efficacy (poise and communication style, including clear, confident delivery) (Prasyudhastyka & Probowati, 2025; Svider, 2021; Wilcox & NicDaéid, 2018).

Attorneys and judges may lack deep scientific literacy, making visible cues and structured frameworks especially important in practice (Shur & Robin, 2020; Cooper et al., 1996).


Biomechanical and Medical‑Legal Expertise

In injury and malpractice cases, biomechanical and medical‑genetic experts are expected to:

  • Use established scientific frameworks to explain whether particular forces can or cannot cause specific injuries (Kale, 2023; Pergolizzi & LeQuang, 2024; Cramer et al., 2014).

  • Distinguish evidence-based mechanisms from speculative or unsupported alternative theories, especially when vulnerable populations (e.g., children in suspected abuse) are involved (Shur & Robin, 2020; Pergolizzi & LeQuang, 2024).

  • Assist courts with limited medical training but substantial gatekeeping responsibilities in evaluating complex evidence (Kale, 2023; Shur & Robin, 2020; Shenoy et al., 2022; Martire & Montgomery-Farrer, 2020; Cooper et al., 1996).

Guidance in pediatrics, genetics, surgery, and other specialties emphasizes that experts must represent biomedical science and standards of care, and that inaccurate or unsubstantiated opinions can lead to serious injustices (Shur & Robin, 2020; Pergolizzi & LeQuang, 2024; , 2018).


Communication Skills: From Deposition to Jury

Across studies:

  • Jurors and judges favor experts who present clear, structured explanations in plain language, use analogies grounded in everyday experience, and, where appropriate, support testimony with visuals (Kale, 2023; Blackwell & Seymour, 2015; Shenoy et al., 2022; Martire & Montgomery-Farrer, 2020; Prasyudhastyka & Probowati, 2025).

  • Effective experts acknowledge limitations without abandoning well-supported core opinions, which tends to enhance trust rather than weaken it (Pergolizzi & LeQuang, 2024; Kipoulas et al., 2024; Svider, 2021; Wilcox & NicDaéid, 2018).

  • Witness credibility (confidence, trustworthiness, likability, and perceived knowledge) predicts legal decision-making and verdict tendencies (Prasyudhastyka & Probowati, 2025; Svider, 2021).


Conclusion

Across civil and criminal matters, the most effective experts combine Daubert-ready, peer-reviewed methods, field-specific expertise, ethical independence, and clear, jury-level communication. Empirical research suggests that rigorous vetting across these dimensions improves both the admissibility and the persuasive force of expert testimony, strengthening case outcomes and the integrity of the justice process (Kale, 2023; Odusote, 2025; Pergolizzi & LeQuang, 2024; Shur & Robin, 2020; Blackwell & Seymour, 2015; Miehe, 2024; Kipoulas et al., 2024; Shenoy et al., 2022; Martire & Montgomery-Farrer, 2020; Prasyudhastyka & Probowati, 2025; Svider, 2021; , 2018; Engin, 2005; DeMatteo et al., 2019; Cooper et al., 1996; Masella & Meister, 2001; Wilcox & NicDaéid, 2018; Cramer et al., 2014).


References

(2018). Decisional Dimensions in Expert Witness Testimony – A Structural Analysis. Frontiers in Psychology, 9. https://doi.org/10.3389/fpsyg.2018.02073

Blackwell, S., & Seymour, F. (2015). Expert Evidence and Jurors’ Views on Expert Witnesses. Psychiatry, Psychology and Law, 22, 673 - 681. https://doi.org/10.1080/13218719.2015.1063181

Cooper, J., Bennett, E., & Sukel, H. (1996). Complex scientific testimony: How do jurors make decisions?. Law and Human Behavior, 20, 379-394. https://doi.org/10.1007/bf01498976

Cramer, R., Parrott, C., Gardner, B., Stroud, C., Boccaccini, M., & Griffin, M. (2014). An Exploratory Study of Meta-Factors of Expert Witness Persuasion. Journal of Individual Differences, 35, 1-11. https://doi.org/10.1027/1614-0001/a000123

DeMatteo, D., Fishel, S., & Tansey, A. (2019). Expert Evidence: The (Unfulfilled) Promise of Daubert. Psychological Science in the Public Interest, 20, 129 - 134. https://doi.org/10.1177/1529100619894336

Engin, A. (2005). FORENSIC BIOMECHANICS – TRANSDISCIPLINARY APPROACH IN THE COURT OF LAW. Journal of Integrated Design & Process Science, 9, 75 - 85. https://doi.org/10.3233/jid-2005-9206

Kale, S. (2023). MEDICAL KNOWLEDGE OF THE JUDICIARY AND THE IMPORTANCE OF THE MEDICAL EXPERT WITNESS FOR ASSISTING JUDICIAL APPRECIATION OF MEDICO-LEGAL EVIDENCE. ShodhKosh: Journal of Visual and Performing Arts. https://doi.org/10.29121/shodhkosh.v4.i2.2023.5663

Kipoulas, E., Edwards, I., Radakovic, R., & Beazley, P. (2024). Perceptions of bias and credibility of male and female clinical psychologist and psychiatrist expert witnesses presenting clinical information in the courtroom.. International journal of law and psychiatry, 96, 102016. https://doi.org/10.1016/j.ijlp.2024.102016

Martire, K., & Montgomery-Farrer, B. (2020). Judging experts: Australian magistrates’ evaluations of expert opinion quality. Psychiatry, Psychology and Law, 27, 950 - 962. https://doi.org/10.1080/13218719.2020.1751334

Masella, R., & Meister, M. (2001). The ethics of health care professionals' opinions for hire.. Journal of the American Dental Association, 132 3, 361-7. https://doi.org/10.14219/jada.archive.2001.0179

Miehe, S. (2024). Expert Characteristics and the Impact It Has on Credibility in the Eyes of the Jury. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.4783006

Odusote, A. (2025). Critique of Admissibility of Expert witness in justice delivery among courts in Nigeria in comparison with United States of America and United Kingdom. Cradle of Knowledge: African Journal of Educational and Social Science Research (The). https://doi.org/10.4314/ajessr.v12i1.4

Pergolizzi, J., & LeQuang, J. (2024). Black Robes and White Coats: Daubert Standard and Medical and Legal Considerations for Medical Expert Witnesses. Cureus, 16. https://doi.org/10.7759/cureus.69346

Prasyudhastyka, C., & Probowati, Y. (2025). Karakteristik Saksi Ahli Psikologi Yang Memiliki Kredibilitas. IDEA: Jurnal Psikologi. https://doi.org/10.32492/idea.v9i1.9113

Shenoy, A., Shenoy, G., & Shenoy, G. (2022). Expert witness testimony in medical malpractice litigation: Minutiae and methods – In credence and credibility. Ethics, Medicine and Public Health. https://doi.org/10.1016/j.jeme

Shur, N., & Robin, N. (2020). Medical genetics, expert medical testimony, and suspected child abuse cases: a call for evidence-based standards in clinic and the courtroom.. Current Opinion in Pediatrics. https://doi.org/10.1097/mop.0000000000000987

Svider, P. (2021). Expert Witness Testimony. Litigation in Otolaryngology. https://doi.org/10.1007/978-3-030-64418-5_19

Wilcox, A., & NicDaéid, N. (2018). Jurors' perceptions of forensic science expert witnesses: Experience, qualifications, testimony style and credibility.. Forensic science international, 291, 100-108. https://doi.org/10.1016/j.forsciint.2018.07.030


About the Author


Dr. Steven B. Ross, DC, FASBE, DAAPM, is a chiropractic physician, spinal biomechanical injury analyst, independent medical examiner, and expert witness with more than 40 years of clinical experience. His work focuses on spinal injury causation, biomechanics, soft-tissue trauma, injury mechanism analysis, chiropractic standard-of-care review, and forensic case evaluation.


Through his writing, Dr. Ross helps healthcare professionals, attorneys, insurance professionals, and injured individuals better understand how traumatic forces, human tissue tolerance, and injury causation relate.


Professional Inquiries

For case reviews, biomechanical analysis, independent medical examinations, expert witness consultation, deposition testimony, trial support, or clinical consultation.


Dr. Steven B. Ross

Phone: (858) 544-1494


Practice Areas: Spinal Biomechanics • Injury Causation Analysis • Independent Medical Examinations • Soft-Tissue Injury Evaluation • Chiropractic Standard-of-Care Review • Expert Witness Consultation and Testimonysis

 
 
 

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