Informational only. Not legal advice. No attorney-client relationship is created by reading this post. Consult a licensed attorney in your jurisdiction.
Few aspects of trial practice have more consequence than the gatekeeping role courts exercise over expert testimony. In the Eleventh Circuit and Florida state courts, that role has been reshaped over the past decade—Florida completing a prolonged transition from the Frye general-acceptance standard to the Daubert reliability framework in 2019, and federal courts implementing the December 2023 amendment to Federal Rule of Evidence 702. Alabama occupies a hybrid position. Practitioners who fail to appreciate the current landscape in each forum face preventable disasters at the Daubert hearing.
I. The Federal Framework: Daubert and Its Progeny
Daubert v. Merrell Dow Pharmaceuticals, Inc.
Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993), replaced Frye v. United States, 293 F. 1013 (D.C. Cir. 1923), as the federal standard for admissibility of scientific expert testimony. Frye had required that the technique or theory underlying the testimony be "sufficiently established to have gained general acceptance in the particular field." Daubert held that the Federal Rules of Evidence—specifically Rule 702—superseded Frye's rigid general-acceptance prerequisite and conferred on trial judges a gatekeeping obligation to assess both the reliability and relevance of proffered expert testimony.
The Daubert Court identified a non-exhaustive list of factors relevant to the reliability inquiry:
- Whether the theory or technique has been tested;
- Whether it has been subjected to peer review and publication;
- The known or potential rate of error;
- The existence and maintenance of standards controlling the technique's operation; and
- Whether the theory or technique has achieved general acceptance in the relevant scientific community.
Daubert applied primarily to "scientific" knowledge. The Court signaled uncertainty about whether the framework extended to non-scientific technical testimony.
Kumho Tire Co. v. Carmichael
Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999), resolved that uncertainty. The Court held that the district court's gatekeeping obligation under Daubert applies to all expert testimony—not only scientific testimony, but also technical and "other specialized knowledge" under Rule 702. The Court further held that the specific Daubert factors "may or may not be pertinent" in any particular case; the trial court's gatekeeping function is "flexible," and the court may use the Daubert factors or other indicia of reliability as it deems appropriate to the type of expertise at issue.
Kumho Tire is particularly important for engineering, forensic, and experience-based experts who rely on pattern recognition, field inspection, or accumulated professional judgment rather than controlled experimentation. The trial court must still assess reliability, but the reliability analysis is tailored to the nature of the expertise.
The 2023 Amendment to Federal Rule of Evidence 702
Effective December 1, 2023, the Advisory Committee on Evidence Rules amended Fed. R. Evid. 702 to clarify two points that courts had sometimes blurred:
- The proponent must demonstrate admissibility to the court "by a preponderance of the evidence" standard—not a mere prima facie showing;
- The expert's opinion must itself reflect a reliable application of the principles and methods to the facts of the case—not merely that the expert followed reliable methods in the abstract.
The amended rule reads that an expert may testify if: "the proponent demonstrates to the court that it is more likely than not" that (a) the testimony is based on sufficient facts or data; (b) it is the product of reliable principles and methods; and (c) the expert's opinion reflects a reliable application of the principles and methods to the facts of the case.
This amendment has practical force. Courts that previously admitted expert opinions by asking only whether the methodology was sound must now scrutinize whether the specific opinion—the conclusion—follows reliably from the application of that methodology to the facts presented.
II. The Eleventh Circuit's Application
The Eleventh Circuit applies Daubert and Kumho Tire under the abuse-of-discretion standard for the trial court's ultimate admissibility decision, with de novo review of the underlying legal standard. The court has articulated a three-part inquiry: the expert must be (1) qualified in the area of testimony; (2) the testimony must be reliable; and (3) the testimony must be relevant (i.e., helpful to the trier of fact). City of Tuscaloosa v. Harcros Chemicals, Inc., 158 F.3d 548, 562 (11th Cir. 1998).
Qualification in the Eleventh Circuit is assessed not by formal title or credentials alone, but by whether the expert's knowledge, skill, experience, training, or education provides genuine expertise in the specific area of the proffered testimony. An expert qualified in structural engineering may not be qualified to opine on geotechnical failure analysis.
Reliability in the Eleventh Circuit requires rigorous scrutiny of whether the expert's conclusions can survive attempted falsification. Courts in this circuit have excluded testimony where experts could not show that their specific hypothesis had been tested; where inspections were done only once, without controlled comparison; or where the expert's conclusion was unsupported by their stated methodology. The Eleventh Circuit has emphasized that the expert must not only use a sound methodology but must actually apply it to reach the specific conclusion offered at trial.
Relevance/fit. The testimony must "fit" the facts of the case—it must logically advance a material aspect of the proponent's case. An engineering expert who opines on causation in a hurricane damage case must connect the general methodology (structural assessment protocols) to the specific building's characteristics and the specific storm conditions at the relevant time and location.
Speculative expert opinions excluded: The Eleventh Circuit has affirmed exclusions where experts based conclusions on assumptions not supported by the record, failed to account for alternative explanations, or relied on methodologies not disclosed in their reports. Courts have noted that the failure to attempt to falsify an expert's conclusions—to test the hypothesis against alternatives—is a significant marker of unreliability.
III. Florida's Tortured Path to Daubert: 2013, 2017, 2018, 2019
Florida's transition from Frye to Daubert spans a decade and involves four distinct events, each of which matters to choice-of-law analysis and the admissibility of older expert disclosures.
Pre-2013: Florida state courts applied the Frye standard, which required the proponent of "new or novel" scientific evidence to prove that the underlying principle and testing procedure were generally accepted in the relevant scientific community. Pure-opinion testimony by experts—opinions based solely on training and experience, not novel scientific techniques—was not subject to Frye.
2013 Legislative Amendment: The Florida Legislature amended Fla. Stat. §§ 90.702 and 90.704 to adopt the Daubert standard and to eliminate the pure-opinion exception. The amendments were modeled on Fed. R. Evid. 702 and required that expert opinions be based on sufficient facts or data, be the product of reliable principles and methods, and reflect a reliable application of those principles to the facts.
2017 Provisional Rejection: In In re Amendments to the Florida Evidence Code, 210 So. 3d 1231 (Fla. 2017), the Florida Supreme Court declined to adopt the 2013 Daubert amendments to the extent they were procedural, citing constitutional concerns about legislative encroachment on the court's rulemaking authority.
2018 Constitutional Ruling: In DeLisle v. Crane Co., 258 So. 3d 1221 (Fla. 2018), the Florida Supreme Court held that the Legislature's 2013 amendment of § 90.702 was unconstitutional as a procedural matter and affirmed that Frye remained the controlling standard. The court reverted to the Frye analysis for admissibility of expert testimony.
2019 Adoption: Just seven months later, in In re Amendments to the Florida Evidence Code, No. SC19-107 (Fla. May 23, 2019), a newly constituted Florida Supreme Court reversed course in a 5-2 decision. The court sua sponte adopted the Daubert amendments as rules of court—exercising its own rulemaking authority rather than deferring to the Legislature—and held that Daubert would replace Frye as the standard for admissibility of expert testimony in Florida state courts, effective immediately.
Current Florida standard: Fla. Stat. § 90.702, as now in effect, tracks the pre-2023 federal Rule 702 language: expert testimony is admissible if (1) based on sufficient facts or data; (2) the product of reliable principles and methods; and (3) the witness has reliably applied the principles and methods to the facts. The Frye general-acceptance test is no longer the standard for Florida state courts.
Note, however, that the Florida Supreme Court did not resolve the substantive constitutional concerns raised in DeLisle; it deferred those to a proper case or controversy. Further challenges are possible, though the current court composition makes a renewed reversal unlikely in the near term.
IV. Alabama: The Hybrid Daubert/Frye Standard
Alabama occupies a distinctive position. Under Alabama Rule of Evidence 702 and the court decisions implementing it, Alabama applies a Daubert-based standard for admissibility of most expert scientific testimony in civil cases. See Turner v. State, 746 So. 2d 355 (Ala. 1998). However, Alabama retains a modified Frye component—general acceptance remains "highly probative" as an indicator of reliability.
Critically, for non-scientific expert testimony (technical or specialized knowledge), Alabama courts need only find that the expert is qualified and that the testimony will assist the trier of fact—a considerably less demanding inquiry than the full Daubert reliability analysis.
Furthermore, Alabama's Daubert-based standard has exceptions: it does not apply in the same manner to domestic relations cases, child support cases, juvenile cases, probate cases, or criminal cases involving non-felony charges. In those categories, the older Frye standard may still apply.
The standard of appellate review for expert admissibility decisions in Alabama is de novo for the underlying scientific theory or technique (not abuse of discretion), per the Alabama Supreme Court's modification of the standard in cases following Ex parte Turner. This higher level of review means that expert exclusions can be reversed more readily in Alabama than in federal court.
V. Pre-Trial Motion Practice
Eleventh Circuit and Florida Federal Courts
Timing: Move to exclude expert testimony by the deadline set in the scheduling order—typically shortly after expert reports are exchanged. In the Eleventh Circuit, motions to exclude filed too close to trial are disfavored. Courts in the Southern and Middle Districts of Florida typically set Daubert motion deadlines concurrent with or shortly after the close of expert discovery.
The evidentiary hearing: Courts are not required to hold an evidentiary hearing on Daubert motions; they may rule on the papers. However, for complex or contested expert challenges, request a hearing. Live testimony from the challenged expert and competing experts allows the court to make a fully informed reliability determination.
Strategies for proponents: Disclose expert reports that are detailed enough to survive scrutiny. The report must include: (a) a complete statement of all opinions; (b) the basis and reasons for each opinion; (c) the facts or data considered; (d) any exhibits used; (e) the expert's qualifications; (f) a list of all other cases in which the expert has testified in the previous four years; and (g) the expert's compensation. Fed. R. Civ. P. 26(a)(2)(B). Opinions not sufficiently disclosed in the report will be excluded.
Strategies for opponents: Target the connection between the methodology and the specific opinion. Even if the general methodology is reliable, argue that the expert failed to reliably apply it to these specific facts. Depose the expert with the 2023 amendment's requirement in mind—elicit admissions that the conclusion does not necessarily follow from the methodology applied to the specific facts.
Florida State Court Practice
Under Fla. R. Civ. P. 1.390, experts may be called to testify at any stage of the proceedings. Daubert motions in Florida state court are typically filed as motions in limine and heard pre-trial. Florida's Daubert standard mirrors the current federal Rule 702 pre-2023 formulation; the 2023 federal amendment is not automatically incorporated into Florida's § 90.702.
VI. Open Questions and Trends
The December 2023 amendment to Fed. R. Evid. 702 has not yet been fully absorbed by Eleventh Circuit doctrine. The amendment's explicit preponderance-of-the-evidence standard for the proponent should shift some close cases toward exclusion. Courts that previously gave the proponent the benefit of the doubt may now demand a more affirmative showing.
In Florida, the durability of the 2019 Daubert adoption remains to be tested if the substantive constitutional challenges deferred in DeLisle are raised in a proper case. For now, practitioners should operate under the current Daubert regime and brief Daubert principles as if Florida state court and the Eleventh Circuit apply the same standard—because they substantially do.
Conclusion
The Eleventh Circuit, Florida state courts, and Alabama courts all nominally operate under Daubert or a Daubert-influenced framework, but the implementation details differ materially. The 2023 amendment to Fed. R. Evid. 702 has sharpened the federal standard. Florida state courts completed their Daubert transition in 2019 after years of doctrinal whipsaw. Alabama applies a hybrid standard with different treatment for non-scientific experts. In every forum, the practitioner who masters the specific gatekeeping inquiry—and who builds or challenges expert reports with that inquiry in mind—will have a decisive advantage at the Daubert hearing.
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Informational only. Not legal advice. No attorney-client relationship is created by reading this post. Consult a licensed attorney in your jurisdiction.