How can the defense try to exclude my expert witness in Georgia?

· 3 min read

The defense usually tries to keep an expert off the stand by challenging whether the testimony meets Georgia’s reliability standard. That standard lives in O.C.G.A. § 24-7-702, and a challenge under it asks the judge, acting as a gatekeeper, to rule that the proposed expert opinion does not qualify as admissible evidence and so the jury should never hear it.

The gatekeeping standard

Section 24-7-702 allows expert testimony only when several conditions are met. The witness must be qualified by knowledge, skill, experience, training, or education; the testimony must rest on sufficient facts or data; it must be the product of reliable principles and methods; and the expert must have applied those methods reliably to the facts of the case. This framework, drawn from the Daubert line of authority, requires the trial judge to screen expert opinions for reliability before they reach the jury.

A defense challenge, often raised through a motion to exclude, attacks one or more of these pillars. The court holds the testimony to the statute’s requirements and decides whether it clears the bar.

Common lines of attack

A defendant seeking to exclude an expert typically argues that the opinion fails one of the statutory elements. Frequent angles include:

  • Questioning the expert’s qualifications for the specific subject at issue.
  • Arguing the opinion rests on insufficient or unreliable facts and data.
  • Contending the methodology is not generally accepted or reliable.
  • Claiming the expert did not properly apply a sound method to the actual facts.

Material for these arguments often comes from the expert’s deposition, where the defense probes assumptions, gaps, and methodology under oath. Concessions made there can become the foundation of the motion to exclude.

What a ruling means

If the judge agrees the testimony does not satisfy § 24-7-702, the expert may be barred entirely or limited to certain opinions. Because expert proof is frequently essential, exclusion can seriously weaken or even doom a claim that depends on it. If the testimony survives, the defense’s points usually carry over into cross-examination, where reliability questions go to the weight a jury gives the opinion rather than its admissibility.

The bottom line

In Georgia, the defense tries to exclude an expert by arguing that the testimony does not meet the reliability requirements of § 24-7-702, attacking qualifications, the sufficiency of the data, the methodology, or its application. The trial judge serves as gatekeeper and decides admissibility, so a successful challenge can remove a key witness, while an unsuccessful one shifts the fight to cross-examination over how much weight the opinion deserves.

This article is for general educational and informational purposes only and is not legal advice. It does not create an attorney-client relationship, and Georgia law may change. For advice about a specific situation, consult a licensed Georgia personal injury attorney.

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