Who determines if someone is qualified as an expert witness in court?

The determination of whether someone qualifies as an expert witness in court rests with the judge. Judges assess the qualifications, experience, and expertise of potential expert witnesses to ensure that their testimony is relevant, reliable, and based on a credible foundation in their respective fields. This process is usually guided by standards set forth in rules of evidence and legal precedents, which vary by jurisdiction but often require that the proposed expert’s knowledge or skill significantly aids the jury in understanding evidence or determining a fact in issue.

While attorneys may propose individuals as experts based on their qualifications, it is ultimately the judge's responsibility to make the final decision, thereby ensuring the integrity of the evidence presented in court. This gatekeeping role of the judge is crucial in maintaining the quality and relevance of expert testimony in legal proceedings. Other roles, such as those of the jury or the plaintiff, do not involve the authority to qualify expert witnesses; the jury evaluates the credibility and weight of the testimony once it is allowed, and the plaintiff can only suggest experts based on their case needs.