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Does Anyone Get Stopped at the Gate? An Empirical Assessment of the Daubert Trilogy in the States


Eric Helland


Claremont McKenna College - Robert Day School of Economics and Finance; RAND

Jonathan Klick


University of Pennsylvania Law School; Erasmus School of Law; PERC - Property and Environment Research Center

March 20, 2009

U of Penn, Inst for Law & Econ Research Paper No. 09-12
Robert Day School of Economics and Finance Research Paper No. 2009-06

Abstract:     
The Supreme Court's trilogy of evidence cases, Daubert, Joiner, and Kumho Tire appear to mark a significant departure in the way scientific and expert evidence is handled in federal court. By focusing on the underlying methods used to generate the experts' conclusions, Daubert has the potential to impose a more rigorous standard on experts. Given this potential, some individuals have called for states to adopt the Daubert standards to purge "junk science" from state courts. However, there is relatively little empirical support for the notion that Daubert affects the quality of expert evidence. Using a large dataset of state court litigation, we examine whether state adoption of the Daubert standards has a systematic effect on the observable characteristics of experts retained in civil cases. We find very little evidence in support of a significant Daubert effect. This is true even when we do a more detailed analysis of experts in products liability cases, an area of particular concern in the expert evidence debate. These results suggest that, at the state level at least, adoption of the Daubert standards has not led to increasing rigor in expert testimony.

Number of Pages in PDF File: 27

Keywords: Scientific and expert evidence, federal courts, state courts, standards of admissibility, quality of expert testimony, products liability, judges

JEL Classification: C25, K13, K41

working papers series


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Date posted: March 31, 2009  

Suggested Citation

Helland, Eric and Klick, Jonathan, Does Anyone Get Stopped at the Gate? An Empirical Assessment of the Daubert Trilogy in the States (March 20, 2009). U of Penn, Inst for Law & Econ Research Paper No. 09-12; Robert Day School of Economics and Finance Research Paper No. 2009-06. Available at SSRN: http://ssrn.com/abstract=1370518 or http://dx.doi.org/10.2139/ssrn.1370518

Contact Information

Eric A. Helland
Claremont McKenna College - Robert Day School of Economics and Finance ( email )
500 E. Ninth St.
Claremont, CA 91711-6420
United States
909-607-7275 (Phone)
909-621-8243 (Fax)
RAND ( email )
1776 Main Street
Santa Monica, CA
United States
Jonathan Klick (Contact Author)
University of Pennsylvania Law School ( email )
3501 Sansom Street
Philadelphia, PA 19104
United States
2157463455 (Phone)
Erasmus School of Law ( email )
3000 DR Rotterdam
Netherlands
PERC - Property and Environment Research Center
2048 Analysis Drive
Suite A
Bozeman, MT 59718
United States

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