The Three Stages of The Daubert Trilogy
PsychLaw.net frequently discusses the use of the Daubert trilogy. We want our readers to have a clear understanding of how to apply the Daubert trilogy when cross examining experts. It is important in both the fields of science and law to have valid, relevant science discussed and applied to our cases. To understand better, the application of the Daubert trilogy can be broken down into three distinct stages.
Stage One – Background and Experience
The fact that an expert possesses a particular title or degree, while relevant, is not dispositive in qualifying the expert. Rather, there must be further inquiry as to whether the actual qualifications of the expert enable him or her to assist the trier of fact with regard to one or more controverted issue. For example, while a pediatrician may be qualified to provide medical diagnoses, generally, they may not necessarily have the expertise to provide an opinion as to whether a child has attention-deficit/hyperactivity disorder.
Stage Two – Application to Facts of Case
The cross-examiner must explore whether the proffered expert has an opinion that offers a reliable application to the facts of the case. This is determined in a two-tier fashion by applying the evidentiary rules FRE 702 and FRE 703.
The first hurdle of the second level of fit, endorsed by the Daubert court, is to determine if the opinion is helpful and “properly can be applied to the facts in issue.”[1] As the Advisory Committee for the FRE and several federal circuits have explained, this helpfulness concept is the “touchstone” of Rule 702.[2]
The second hurdle for this second level of fit, FRE 703’s “reasonable reliance,” allows that an expert opinion need not necessarily be based upon admissible evidence. It is sufficient for an expert’s opinion to rest on data “reasonably relied upon by experts in the particular field in forming opinions or inferences upon the subject.”[3]
This fit does not need to be exact[4]. It is sufficient for the expert’s orientation, background, and methodology to fit the facts with reasonable scientific specificity and go beyond subjective belief or unsupported speculation.[5] In assessing the admissibility of expert testimony, the primary focus of courts is that the testimony fit the facts. When it does, it assists the trier of fact “to understand the evidence or to determine a fact in issue.”[6]
According to the Federal Rule Advisory Committee, the goal is to allow experts to function essentially the same way in court as they do out of court, which produces more realistic and useful expert testimony. The Advisory Committee reasoned that as physicians base their diagnoses on hearsay and other inadmissible facts (e.g., statements from other medical personnel, patients, relatives, hospital records, objective tests, etc.), it should be a good enough basis for an expert’s opinion at trial.[7]
Therefore, expert testimony may be derived from any one of the following three sources:
- The expert’s first-hand knowledge of the facts acquired before the hearing.
- Facts and data made known to the expert at the hearing.
- Facts and data obtained outside of court other than from personal observation.
This approach allows an expert to base their opinion on facts or data perceived by or made known to the expert before the hearing and is more expansive than under common law. However, this interpretation does not allow an expert to base their opinion on assumptions and data that are so contrary to the evidence in the record or on assumptions that are so untethered to the actual facts, that they amount to conjecture and speculation.[8] Consequently, a judge’s determination as to whether an expert is truly qualified for the circumstances of the particular case must take into account the fact that their opinion may be based on untrustworthy underpinnings.[9]
Stage Three – Scientific Methodology
The Court’s guidance in Daubert, later refined in 1999 in Kumho, regarding scientific or professional expertise is that the opinion must be grounded in the “same level of intellectual rigor that characterizes the practice of an expert in the relevant field.”[10] Thus, while a scientist must ground his opinion in the reasoning and methodology of science,[11] a professional from a less scientific discipline may still qualify as an expert from their “professional studies or personal experience” in that field.[12]
Courts are encouraged to consider the non-exclusive list of factors set out in Daubert in making this determination, including: (1) Can the theory or technique be tested? (2) Has the theory or technique been subjected to peer review and publication? and (3) What is the known or potential rate of error?[13] However, these are not “definitive” and may not necessarily apply to exclude a witness.[14] Ultimately, it is within the trial court’s discretion to decide which factors to consider and which to ignore.
Nonetheless, a failure of this third level of fit should exclude an expert, even if the expert’s background and knowledge of the discipline fit and was well oriented to the issues in controversy. Again, it is through voir dire that this inquiry is best conducted.
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[1] Daubert, 509 U.S. at 592-93.
[2] See, e.g., Fed. R. Evid. 702 advisory committee’s note to 2000 amendment. Kopf v. Skyrm, 993 F.2d 374, 377 (4th Cir. 1993).
[3] The reform accomplished by the second sentence of FRE 703 has two practical effects. First, it reduces the need for firsthand knowledge on the part of experts. Second, the fact that an expert may testify without firsthand knowledge, when coupled with the principle that the underlying basis need not be set out before opinion testimony is given, substantially reduces the need for hypothetical questions. According to the Advisory Committee, the focus of the reasonable reliance standard is the quality and sufficiency of outside information and the manner of, and reasons for, its use. This is the model in the case law prior to the federal Advisory Rule December 2000 change. This occasion of the “reasonable reliance” analysis is now located in FRE 702. However, many states still locate this analysis of reliance in 703. The reader must verify for the reader’s state practice.
[4] There are numerous examples of cases wherein the courts have found experts with sufficient case-specific expertise. See, e.g., Enercomp, Inc. v. McCorhill Pub., Inc., 873 F.2d 536, 550 (2d Cir. 1989) (where a senior associate in corporate finance was found qualified to testify on value of defendant’s assets in light of experience in field of mergers and acquisitions); Dunn v. HOVIC, 1 F.3d 1362, 1368 (3d Cir. 1993), modified on other grounds, 13 F.3d 58 (3d Cir. 1993) (allowing an occupational medicine practitioner to testify as expert on asbestos in light of experience with other employers and his review of defendant’s corporate records); Myers v. Griffin-Alexander Drilling Co., 910 F.2d 1252, 1254 (5th Cir. 1990) (holding an expert in hyperbaric medicine was qualified to testify on the effects of nitrogen on plaintiff); U.S. v. Metzger, 778 F.2d 1195, 1203–1204 (6th Cir. 1985) (admitting testimony of a witness who conducted thin-layer chromatography to test for presence of chemical, and who had attended numerous courses and seminars dealing with explosives), cert. denied 477 U.S. 906 (1986); Williams v. Pro-Tec, Inc., 908 F.2d 345, 348 (8th Cir. 1990) (in a pre-Daubert case, a mechanical engineer’s self-acknowledged lack of medical expertise went to the ‘‘weight’’ of his opinion about an eye injury rather than to the admissibility of his opinion); Wheeler v. John Deere Co., 935 F.2d 1090, 1100 (10th Cir. 1991) (finding a mechanical engineer with special expertise in safety design of mechanical equipment was qualified as expert in products liability action); U.S. v. Hensel, 711 F.2d 1000, 1006 (11th Cir. 1983) (allowing a fire inspector was allowed to testify about the origins of a fire aboard a ship despite his alleged shortcomings in admiralty area).
[5] Daubert, 509 U.S. at 589-90; DaSilva v. American Brands, Inc., 845 F.2d 356, 360–36 (1st Cir. 1988) (in a pre-Daubert case, the appellate court rejected a defendant’s view that a mechanical engineer with 23 years of experience with machine design was not qualified as an expert because his design experience was not with the ‘‘specific machine’’ in question); Schmaltz., 878 F. Supp. at 1121 (where the court noted that the suggested scientific testimony must ‘‘fit’’ the issue about which the expert is testifying); Paoli, 35 F.3d at 742; Stagl v. Delta Air Lines, Inc., 117 F.3d 76, 81–82 (2d Cir. 1997) (where the district court erred in concluding that well-trained person who lacked specific expertise in airport terminal design or baggage claim systems was insufficiently qualified to testify); Holbrook v. Lykes Bros. S.S. Co., Inc., 80 F.3d 777, 781–783 (3d Cir. 1996) (determining that it was an abuse of discretion to exclude an expert’s testimony simply because the trial court did not deem witness to be the best qualified or to have the specialization that the court considered most appropriate. The appellate panel granted a new trial because the trial court disallowed the treating doctor’s testimony about decedent’s cancer because he was not a pathologist, oncologist, or expert in ‘‘definitive cancer diagnosis’’); Garrett v. Desa Industries, Inc., 705 F.2d 721, 725 (4th Cir. 1983) (allowing a mechanical engineer to testify on problems with stud drivers because of his education even though he has no specific experience with stud drivers); Weese v. Schukman, 98 F.3d 542, 549–550 (10th Cir. 1996) (allowing a physician to testify as an expert witness, even though he had no experience in treatment for carbon monoxide poisoning, because physician was qualified to testify about another method of treatment for carbon monoxide poisoning that he believed met standard of care).
[6] Remember, the court can always reach out to find another expert. See, e.g., Stagl, 117 F.3d at 81-82 (noting a court may consider the availability of other more qualified experts in deciding to exclude testimony on the grounds that the proposed expert is not sufficiently knowledgeable in the area).
[7] Fed. R. Evid. 703 advisory committee’s note to 1972 proposed rules. This is the model in the case law prior to the federal Advisory Rule December 2000 change. This occasion of the “reasonable reliance” analysis is now located in FRE 702. However, many states still locate this analysis of reliance in 703. The reader must verify for the reader’s state practice.
[8] In subsequent sections, the author provides illustrative cases where speculative, unreliable expert testimony was proffered and rejected.
[9] Zenith Radio Corp. v. Matsushita Elec. Indus. Co., Ltd., 505 F. Supp. 1313, 1325 (E.D. Pa. 1980), aff’d in part, rev’d in part, 723 F.2d 238 (3d Cir. 1983) (holding that the court must determine whether facts or data is of the type reasonably relied upon by experts in their respective fields), cert. granted in part, 471 U.S. 1002 (1985) rev’d on other grounds, 475 U.S. 574 (1986). See also Shatkin v. McDonnell Douglas Corp., 565 F. Supp. 93 (S.D.N.Y. 1983).
[10] Kumho Tire Co., Ltd. v. Carmichael, 526 U.S. 137, 152 (1999). Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579, 595 (1993) (‘‘the ‘‘focus.. . .must be solely on principles and methodology.’’).
[11] Daubert, 509 U.S. at 595.
[12] Kumho, 526 U.S. at 152.
[13] Daubert, 509 U.S. at 593-94.
[14] Kumho, 526 U.S. at 151.