A Frye hearing is required where two sides have opposing literature on a contested novel service

The admissibility of novel scientific evidence in New York courts is governed by the Frye standard, a rigorous test requiring that the scientific theory or methodology underlying expert testimony be generally accepted within the relevant scientific community. This evidentiary framework, established in the 1923 federal case Frye v. United States and adopted by New York courts, serves as a gatekeeper to prevent unreliable or speculative scientific testimony from influencing jury verdicts. When competing expert witnesses present conflicting scientific literature on an emerging medical theory, courts must determine whether a formal Frye hearing is necessary to evaluate the general acceptance of the scientific principles at issue.

The threshold question in Frye analysis is whether the scientific evidence is truly novel or whether it involves well-established principles. Courts need not conduct Frye hearings for routine medical testimony based on widely accepted diagnostic methods. However, when expert opinions rest upon controversial theories supported by competing bodies of peer-reviewed literature, the judicial inquiry becomes more complex. The Second Department’s decision in Sepulveda v. Dayal illustrates how courts navigate this terrain when medical experts dispute whether specific diagnostic capabilities have achieved general acceptance in the medical community.

Case Background

Sepulveda v Dayal, 2016 NY Slip Op 06949 (2016)

Sepulveda v. Dayal arose from a medical malpractice claim alleging that the defendant physician failed to properly interpret prenatal ultrasound studies and thereby missed diagnosing a fetal neuroblastoma. The case presented a fundamental dispute about the capabilities and limitations of prenatal diagnostic imaging. The plaintiff’s experts asserted that routine prenatal sonography could detect fetal neuroblastomas before birth, supporting this position with peer-reviewed published articles documenting such detections. The defendant’s experts countered that this diagnostic capability was not reliable or generally accepted within the medical community, creating a direct conflict in the scientific literature.

The procedural posture involved the defendant’s motion for summary judgment dismissing the medical malpractice claim. The trial court, confronted with dueling expert affidavits supported by conflicting scientific publications, declined to resolve the matter on summary judgment and instead ordered a Frye hearing to determine whether the plaintiff’s expert opinions were based on generally accepted scientific principles.

Jason Tenenbaum’s Analysis

(1) To paraphrase, there were many experts who offered differing testimony “whether the infant plaintiff’s neuroblastoma could have been discovered before birth”

(2) “Defendant’s experts established a prima facie case that the ultrasound studies were properly interpreted and that none of defendant’s acts or omissions caused the infant plaintiff’s alleged injuries. In light of plaintiffs’ expert opinions to the contrary, however, we cannot hold on the record presented to us that the opinions of plaintiffs’ experts are not generally accepted within the medical and scientific communities. Accordingly, the motion court properly set the matter down for a Frye hearing”

(3) “As noted above, plaintiffs’ experts based their opinions partially on peer-reviewed, published articles stating that routine prenatal sonography had detected fetal neuroblastomas. Whether the information conveyed in these articles has gained general acceptance in the medical community, and thus provides support for the opinions of plaintiffs’ experts, is precisely the topic of a Frye hearing.”

This one is quite interesting for a variety of reasons. Fist, Plaintiff’s have provided a new or novel theory on a medical proposition of fact, that is supported with peer reviewed literature. Second, Defendants have provided evidence that the theory is not reliable. The Court has set the matter down for a Frye hearing.

In the world we practice in, I am thinking of platelet theory and laser acupuncture?

Legal Significance

The Sepulveda decision establishes important principles about when Frye hearings become necessary in medical malpractice litigation. The court’s approach recognizes that peer-reviewed publication does not automatically confer general acceptance within the scientific community. Rather, the existence of published articles supporting a diagnostic capability merely raises the question of whether that capability has achieved sufficient acceptance to satisfy Frye standards. This creates a middle ground between automatic rejection of novel theories and uncritical acceptance of any peer-reviewed research.

The decision also clarifies the burden-shifting framework in Frye analysis. When a defendant’s experts present evidence suggesting that a plaintiff’s scientific theory lacks general acceptance, the plaintiff cannot avoid a Frye hearing simply by citing peer-reviewed literature. Instead, the conflicting bodies of evidence trigger the need for an evidentiary hearing where the court can evaluate testimony from experts in the relevant field about whether the underlying scientific principles have gained widespread acceptance.

This framework has significant implications beyond medical malpractice cases. In no-fault insurance litigation, similar questions arise regarding the general acceptance of diagnostic methods, treatment modalities, and causation theories. The Sepulveda approach suggests that when insurance company peer reviewers challenge emerging treatment protocols or diagnostic techniques based on lack of general acceptance, courts should conduct Frye hearings rather than resolving these disputes through summary judgment motions.

Practical Implications

For attorneys prosecuting medical malpractice or no-fault insurance claims, Sepulveda underscores the importance of establishing not merely that a scientific theory is supported by research, but that it has achieved general acceptance within the relevant scientific community. This may require expert testimony about the prevalence of the diagnostic or treatment method, professional society endorsements, inclusion in standard medical education curricula, and widespread adoption in clinical practice.

Defense counsel can use Sepulveda to challenge expert testimony based on emerging or controversial scientific theories. By presenting evidence that a theory remains disputed or experimental, defendants can trigger Frye hearings that delay cases and potentially result in exclusion of plaintiff’s expert opinions. The decision also highlights the strategic value of expert affidavits that specifically address the general acceptance question rather than merely offering opinions about the medical issues in the case.

Related Articles

• Expert Competency and Medical Literature in New York Medical Malpractice and No-Fault Cases
• The Critical Role of Medical Literature in Expert Testimony
• Understanding Foundation Requirements in Medical Malpractice Expert Testimony
• The Appellate Division discusses how an expert becomes competent to testify about the standard of care in a specific area of practice
• New York No-Fault Insurance Law