When Lee Ann Sommerville took a Charleston, West Virginia chemical plant to court last year, she framed her case as a public health crisis. Sommerville claimed she had been exposed to ethylene oxide – an alleged carcinogen – and argued that she needed medical monitoring before it was too late.
Her case relied almost entirely on the testimony of Dr. Ranajit Sahu, a mechanical engineer who had appeared as an expert witness in every EtO lawsuit filed to date. The District Court rejected his testimony, excluding his findings under Federal Rule of Evidence 702 on the grounds that his methodology was unreliable and that he had “cherry-picked” data to support a predetermined conclusion.
Rule 702 helps keep misinformation out of the court. Testimony rooted in speculative science can mislead juries, skew verdicts, and drive up costs for consumers. Upholding strong evidentiary standards is not just an ethical responsibility for judges – it’s the law. Rule 702 requires witnesses to be “qualified as an expert by knowledge, skill, experience, training, or education.”
Cases like Lee Ann Sommerville’s are not uncommon. Rather, they emphasize the need for strong evidentiary standards. Without such safeguards, courts risk becoming venues for speculative or methodologically unsound testimony that can mislead juries and drain judicial resources. Consistently applying Rule 702 across federal and state courts would help prevent flawed cases like this from advancing to trial, preserving both the integrity of the legal system and the time and resources of courts and litigants alike.
Judges must constantly look to weed out expert testimony and evidence that is rooted in speculative science. Too often, attorneys working on contingency fees are willing to overlook questionable scientific rigor when self-proclaimed “experts” provide testimony that advances their case, regardless of how flawed its scientific methodologies may be.
Yet despite this clear mandate to reject unsupported scientific testimony, questionable expert evidence continues to influence litigation across the country. Federal courts that have mentioned either Daubert or Rule 702 regularly apply the standard incorrectly – leaving much room for error in the American justice system.
When Rule 702 standards are applied correctly, unfair verdicts can be avoided. These standards serve as a critical check against outcomes built on shaky science. Sommerville’s case illustrates exactly why that matters. Without the District Court judge acting as a gatekeeper, Dr. Sahu’s flawed testimony might have gone unchallenged, and Sommerville could have walked away with a substantial award based on manufactured risk rather than real harm.
Cases like Sommerville’s are driving momentum for reform at the state level to align evidentiary standards with Rule 702’s amended language. Several states have recently moved to bring their standards in line with the latest version of Rule 702, signaling a broader shift in how courts are expected to evaluate expert testimony.
Leading that shift, states like Arizona, Oklahoma and South Dakota have adopted Rule 702, requiring their state judges to rigorously assess the reliability of expert testimony before it reaches the jury. North Dakota and Florida are among other states that have taken significant steps toward alignment, recognizing a consistent, high bar for expert evidence is essential.
Advocates for strong evidentiary standards are hopeful that more states will follow this trend. Correctly applying Rule 702 to all expert testimony will protect all Americans and prevent courts from delivering unjust verdicts.
