What Is the Frye Standard for Expert Witness Testimony?
You have invested time and resources into building your case. But one challenge to an expert witness could change your litigation strategy. When scientific or technical evidence is involved, understanding what is the Frye standard can help you determine whether expert testimony is likely to be admitted. It can also help you prepare if someone challenges that testimony.
For assistance, please reach our team online or call (845) 220-8284 today.
What Is the Frye Standard?
Under the Frye standard, courts admit scientific evidence only if the underlying basis for it is generally accepted by experts in the field.
The standard comes from the 1923 case Frye v. United States, 293 F. 1013 (D.C. Cir. 1923). In that case, the court considered whether to admit evidence from an early lie detector test. The court ruled that before a party presents a scientific method as evidence, it must be generally accepted by professionals working in that field.
This rule became known as the general acceptance test. Many jurisdictions now use different standards. However, the Frye standard remains important in several states, and it continues to influence how courts evaluate scientific evidence.
What Is the Importance of the Frye Standard?
The Frye standard helps courts decide whether scientific evidence is reliable enough to be admitted.
Scientific theories and testing methods constantly evolve. Some become widely accepted after years of research. Others remain experimental or controversial. The Frye standard gives judges a framework for deciding whether juries should hear evidence based on those methods.
The Frye standard helps:
- Promote reliable scientific testimony—courts rely on methods that have gained broad acceptance among qualified professionals;
- Reduce unreliable or experimental evidence—untested theories have a lower chance of influencing the outcome of a case;
- Create consistency—similar scientific evidence receives similar treatment across comparable cases; and
- Protect the integrity of the legal process—judges serve as gatekeepers before scientific testimony reaches a jury.
The framework encourages courts to rely on methods that have earned credibility over time.
How Does the General Acceptance Test Work?
The general acceptance test focuses on the scientific method rather than on the individual witnesses.
The court generally asks whether the expert’s principles, techniques, or procedures have gained widespread acceptance among professionals in the relevant field. The court does not require unanimous agreement. Instead, it looks for broad recognition that the methodology produces reliable results.
When evaluating the evidence under the Frye standard, courts may consider:
- Published scientific research,
- Peer-reviewed studies,
- Professional standards,
- Testimony from other qualified experts, and
- The history of the methodology’s use within the scientific community.
Once the court determines that the methodology satisfies the Frye standard, the parties may still challenge the expert’s conclusions through cross-examination or competing testimony.
What Happens During a Frye Hearing?
A Frye hearing allows a judge to decide whether scientific evidence meets the Frye standard before a jury hears it.
Courts usually hold a Frye hearing only when someone challenges the scientific method behind an expert’s opinion.
During the hearing, both sides may present evidence supporting their position. This may include expert witness testimonies, scientific studies, and professional publications.
After reviewing the evidence, the judge decides whether the scientific method meets the Frye standard. If it does, the expert may testify at trial. If it does not, the court may exclude that testimony.
A Frye Standard Example
This Frye standard example shows how the rule works in practice.
Suppose an expert relies on a new scientific testing method that has not gained broad acceptance within the relevant scientific community. The opposing party challenges the testimony, and the court holds a Frye hearing. If the judge determines the method is not generally accepted, the court may exclude the testimony.
By contrast, if the expert uses a well-established scientific method widely accepted by professionals in the field, the court is more likely to admit the testimony. The jury can then decide how much weight to give the expert’s opinions.
Does Every State Use the Frye Standard?
No. Different jurisdictions use different standards for evaluating scientific evidence.
Many federal courts and many states now follow standards based on Federal Rule of Evidence 702 and the United States Supreme Court’s decision in Daubert v. Merrell Dow Pharmaceuticals, Inc. Others continue to apply the Frye standard or a modified version of it.
Attorneys should confirm which rule governs their case before retaining an expert witness or developing a litigation strategy.
Why Work with FC Consulting & Expert Witness?
Evidence often determines whether a case succeeds or fails. Working with experienced expert witnesses and litigation consultants can help attorneys evaluate technical issues, prepare reliable opinions, and address admissibility challenges before trial.
FC Consulting & Expert Witness provides litigation support. We help numerous industries, including business, hospitality, retail, premises liability, employment, and contract disputes. Dr. Gary Deel has served as a consultant and expert witness in more than 385 legal matters nationwide. His background as an attorney, professor, consultant, and expert witness allows him to communicate complex technical concepts in a way that attorneys and courts can understand.
If you need knowledgeable litigation support for your next case, contact us online or call (845) 220-8284 today to discuss how our team can help.
Frequently Asked Questions
What Is the Difference Between the Frye Standard and the Daubert Standard?
The Frye standard focuses on whether a scientific methodology has gained general acceptance within the relevant scientific community. The Daubert standard uses additional factors to evaluate reliability. Because these standards differ, attorneys should confirm which rule applies in their jurisdiction.
Does the Frye Standard Apply to Every Expert Witness?
No. The Frye standard generally applies when expert testimony relies on scientific methods or principles whose reliability has been challenged. Whether the standard applies depends on the jurisdiction and the type of testimony at issue.
Can an Experienced Expert Witness Still Be Excluded?
Yes. Even a highly qualified expert witness may be excluded if the methodology underlying their opinions does not satisfy the applicable admissibility standard.
Legal References Used to Inform This Page
To ensure the accuracy and clarity of this page, we referenced official legal resources during the content development process:
- Frye v. United States, 293 F. 1013 (D.C. Cir. 1923)
- Testimony by Experts, Fed. R Evid. 702 (2000).
- Cornell Law School, Legal Information Institute, Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993).
FC Consulting & Expert Witness is not a law firm and does not provide legal representation or advice. This article is for general informational purposes only and is not a substitute for consulting with retained legal counsel.
