--- title: Experts Face Greater Scrutiny at Class Certification Stage description: The Supreme Court's decision in Comcast v Behrend is having an impact on cases where class action certification has already been granted. --- #### [![ams-litigation-new-logo](https://blog.ams-litigation.com/hubfs/ams-litigation-new-logo.svg)](https://ams-litigation.com) - [Home](https://ams-litigation.com/) - [Services](https://ams-litigation.com/services/) - [Trademark Surveys](https://ams-litigation.com/services/trademark-surveys/) - [Likelihood of Confusion](https://ams-litigation.com/services/trademark-surveys/likelihood-of-confusion/) - [Dilution](https://ams-litigation.com/services/trademark-surveys/dilution/) - [Secondary Meaning](https://ams-litigation.com/services/trademark-surveys/secondary-meaning/) - [Genericness](https://ams-litigation.com/services/trademark-surveys/genericness/) - [Deceptive Advertising Surveys](https://ams-litigation.com/services/deceptive-advertising-surveys/) - [Class Action Surveys](https://ams-litigation.com/services/class-action-surveys/) - [Claim Substantiation Surveys](https://ams-litigation.com/services/claim-substantiation-surveys/) - [Patent Infringement Surveys](https://ams-litigation.com/services/patent-infringement-surveys/) - [Content Analysis](https://ams-litigation.com/services/content-analysis/) - [Antitrust Surveys](https://ams-litigation.com/services/antitrust-surveys/) - [Rebuttal Surveys and Reports](https://ams-litigation.com/services/rebuttals/) - Experts and Staff - [Survey Experts](https://ams-litigation.com/survey-experts/) - [Staff](https://ams-litigation.com/staff/) - Knowledge Center - [Case Studies](https://ams-litigation.com/case-studies/) - [Webinars](https://ams-litigation.com/webinars/) - [FAQ](https://ams-litigation.com/faq/) - [Resource](https://ams-litigation.com/resource-guides/) - [Blog](https://ams-litigation.com/blog/) - Join Us - [Why Work at AMS](https://www.ams-inc.com/why-work-at-ams/) - [Roles and Career Paths](https://www.ams-inc.com/roles-and-career-paths/) - [Contact Us](https://ams-litigation.com/contact-us/) ![banner Image](https://blog.ams-litigation.com/hubfs/AMS-Dec2017/Images/banner%201.jpg) - [Home](https://ams-litigation.com/) - » - [Blog](https://blog.ams-litigation.com) - » - Experts Face Greater Scrutiny at Class Certification Stage # Experts Face Greater Scrutiny at Class Certification Stage The Supreme Court’s decision regarding expert testimony in *Comcast v. Behrend* is having an impact on cases where certification has already been granted. In the price-fixing litigation against a Johnson & Johnson blood test unit, the Third Circuit vacated class certification citing the requirement for greater scrutiny of expert witnesses during class certification fights. U.S. Circuit Judge Anthony J. Scirica wrote for the panel. “A plaintiff cannot rely on challenged expert testimony, when critical to class certification, to demonstrate conformity with Rule 23 unless the plaintiff also demonstrates, and the trial court finds, that the expert testimony satisfies the standard set out in Daubert.” While survey evidence is common in most Lanham Act cases, it is increasing appearing in class certification disputes. On the plaintiff’s side, surveys can be used to show how damages can be calculated on a class-wide basis. On the defendant’s side, surveys can be used to show the diversity of the putative class or the lack of typicality of the allegations of the named plaintiff(s). Whether for the plaintiff or the defendant, however, survey evidence must conform to the high standards required of scientific evidence in order to survive a Daubert challenge. [Class Action/Class Certification](https://blog.ams-litigation.com/tag/class-action) Share this: Previous Next ### SUBSCRIBE TO OUR BLOG ### Categories - [Trademark (59)](https://blog.ams-litigation.com/tag/trademark) - [News (28)](https://blog.ams-litigation.com/tag/news) - [Conference (23)](https://blog.ams-litigation.com/tag/conference) - [Conjoint Analysis (20)](https://blog.ams-litigation.com/tag/conjoint-analysis) - [Deceptive Advertising (18)](https://blog.ams-litigation.com/tag/deceptive-advertising) - [False Advertising (18)](https://blog.ams-litigation.com/tag/false-advertising) - [Likelihood of Confusion (17)](https://blog.ams-litigation.com/tag/likelihood-of-confusion) ### Applied Marketing Science Founded in 1989 with roots in the MIT Sloan School of Management, Applied Marketing Science is a market research and consulting firm with an established practice focused on consumer surveys for litigation. ### Join Our Mailing List By submitting your information you agree to receive electronic communications from AMS. You may unsubscribe at any time. ### Recent Posts ### Contact Us Applied Marketing Science 78 Blanchard Road, Suite 203 Burlington MA 01803   Phone: [781.250.6300](callto://17812506300) Email: [litigation@ams-inc.com](mailto:litigation@ams-inc.com) [AMS Corporate Site](http://www.ams-inc.com) ©2023 Applied Marketing Science, Inc. | [Sitemap](https://ams-litigation.com/sitemap_index.xml) | [Terms of Use](https://ams-litigation.com/terms-of-use/) | [Privacy Policy](https://ams-litigation.com/privacy-policy) - - ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Robert Klein", "url" : "https://blog.ams-litigation.com/author/robert-klein" }, "datePublished" : "2015-04-09T16:35:21.000Z", "headline" : "Experts Face Greater Scrutiny at Class Certification Stage", "mainEntityOfPage" : { "@id" : "https://blog.ams-litigation.com/experts-face-greater-scrutiny-at-class-certification-stage", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.ams-litigation.com/hubfs/Applied-Marketing-Science-Litigation-Survey-Experts-2.jpg" }, "name" : "Applied Marketing Science" } } ```