Daubert Challenges to Expert Testimony in Georgia Courts

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In a Georgia injury case that rises or falls on causation, the contest over whether an expert ever reaches the witness stand can matter more than the testimony itself. A Daubert challenge asks the trial judge, acting as gatekeeper, to keep an expert’s opinion from the jury on the ground that the methodology behind it is unreliable or wrongly applied. Because so many injury claims depend on a physician or engineer connecting an event to a harm, the outcome of that gatekeeping ruling often shapes everything that follows.

Georgia’s Adoption Of The Standard

Georgia moved off the older Frye general-acceptance test through its 2011 evidence overhaul, effective January 1, 2013, which placed civil expert testimony under OCGA 24-7-702, a provision modeled on Federal Rule of Evidence 702. A later amendment effective July 1, 2022 extended the same Daubert framework to criminal proceedings, but for civil personal injury litigation the controlling standard has been in place since 2013. The statute directs Georgia courts to look for guidance to the federal Daubert trilogy, Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579 (1993), General Electric Co. v. Joiner, 522 U.S. 136 (1997), and Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999), making Georgia’s gatekeeping among the more demanding in the region.

What The Statute Requires

OCGA 24-7-702 permits expert opinion only where three conditions hold together. First, the testimony must be based on sufficient facts or data, which targets the inputs: an opinion built on too thin a factual foundation fails at the threshold regardless of how the analysis proceeds. Second, the testimony must be the product of reliable principles and methods, which targets the methodology itself rather than the conclusion it reaches. Third, the expert must have reliably applied those principles and methods to the facts of the case, which targets execution, so that even an accepted method can fail if the analytical gap between the data and the opinion is too wide. The three prongs are independent, and an opinion must satisfy each. A board-certified specialist with sterling credentials can still be excluded if the method used is unsound, and a sound method can fail if it is misapplied to the particular facts.

The judge resolves these questions before trial in the gatekeeping role the statute assigns. That resolution frequently comes after a dedicated hearing at which the expert is examined about methods and conclusions, the proponent carries the burden of establishing admissibility, and the court makes a record of its reliability findings. The hearing is where the contest is genuinely decided, because the standard the appellate court later applies is deferential.

The Reliability Inquiry

No single consideration controls, and the Kumho trilogy makes the inquiry flexible enough to fit different fields. Courts commonly weigh several non-exclusive factors:

  • Whether the theory or technique can be and has been tested.
  • Whether it has been subjected to peer review and publication, recognizing that publication is not a prerequisite.
  • The known or potential error rate of the method.
  • Whether the technique is generally accepted in the relevant field, which survives Daubert as one factor rather than the test itself.
  • Whether the method was developed independently or generated specifically for the litigation, with litigation-driven methods drawing greater scrutiny.

Where Challenges Concentrate In Injury Cases

Causation opinions attract the most frequent attacks, with the defense contending that a treating physician cannot reliably tie the event to the claimed injury, that the physician relied on the patient’s own account rather than an independent analysis, or that the temporal link between event and symptom was mistaken for a causal one. Biomechanical challenges argue that the forces involved could not have produced the harm alleged, targeting both the method and its application, and they often hinge on whether the expert accounted for the actual crash dynamics rather than a generalized model. Differential-diagnosis challenges question whether alternative causes were adequately ruled in and then ruled out. On the damages side, life-care planners who project the cost of decades of future treatment, and economic experts who reduce future earnings or future medical costs to present value, face challenges to the assumptions, data sources, and methods underlying those projections, since a life-care plan resting on unsupported frequency or pricing assumptions is vulnerable on the same reliability grounds as a causation opinion. The figures in such projections must themselves rest on a reliable foundation; how future medical costs are proven is the subject of its own post and is not reworked here.

How A Ruling Reshapes The Case

A Daubert ruling is rarely all or nothing. A court may admit an expert’s diagnosis opinion while excluding a causation opinion built on a flawed method, or allow testimony about certain injuries but not speculative ones. That selective exclusion shapes what the jury hears without removing the witness entirely. The stakes are highest where exclusion and summary judgment converge: if a causation expert is excluded, a defense motion arguing the absence of causation evidence becomes far stronger, since the very proof the plaintiff needed has been removed from the record. The summary-judgment standard that then applies is covered in its own post; the point here is that the two motions often arrive together and reinforce one another.

A concrete sense of the timing, kept neutral as to any result: the challenge is typically filed after expert discovery closes, the court holds a hearing at which the expert is questioned, and the admissibility ruling issues before trial so both sides know what evidence will be heard. Some courts impose deadlines for such motions, and a challenge not raised in time can be forfeited.

Review On Appeal

A trial court’s Daubert ruling is reviewed for abuse of discretion, the deferential standard the federal trilogy supplies through Joiner. The appellate court asks whether the decision was within the range of reasonable choices, not whether it would have ruled the same way, which means a well-supported gatekeeping decision usually stands. That deference is why the contest is fought hardest at the trial-court hearing rather than reserved for appeal.

Frequently Asked Questions

What standard governs expert testimony in Georgia civil cases?
The Daubert standard codified at OCGA 24-7-702, in force for civil proceedings since the evidence overhaul effective January 1, 2013, with courts guided by the federal Daubert, Joiner, and Kumho decisions.

What does a judge decide as gatekeeper under OCGA 24-7-702?
Whether the opinion rests on sufficient facts or data, flows from reliable principles and methods, and applies those methods reliably to the case facts, each a separate requirement that an opinion must satisfy.

Can an expert be partially excluded in a Georgia injury case?
Yes. A court may admit some opinions while excluding others, such as allowing a diagnosis opinion but barring a causation opinion whose methodology is unreliable.

How is a Georgia Daubert ruling reviewed on appeal?
For abuse of discretion, a deferential standard under which a reasonable trial-court ruling on admissibility is likely to be upheld.

  • OCGA 24-7-702 (expert opinion testimony; Daubert standard; precedential value of federal law)
  • Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993)
  • General Electric Co. v. Joiner, 522 U.S. 136 (1997) (abuse-of-discretion review)
  • Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999)
  • HB 24 (eff. Jan. 1, 2013) civil adoption; 2022 amendment (eff. July 1, 2022) extending the standard to criminal proceedings

Disclaimer

This article provides general information about Daubert challenges under Georgia law and is not legal advice. How the standard applies turns on the specific expert, methodology, and record, and on current Georgia law. Anyone facing such a challenge should consult a licensed Georgia attorney about their particular situation.

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