Which statement best defines the role of expert witnesses in trials?

The role of expert witnesses in trials is best defined by their ability to provide specialized knowledge to assist in the understanding of complex issues that arise during legal proceedings. Expert witnesses are typically professionals or specialists in a particular field, such as medicine, engineering, or forensic science, and they use their expertise to interpret evidence, explain intricate concepts, or provide opinions based on established standards within their discipline.

Their contribution is crucial because the jury and judge may not have the background necessary to understand technical details that are significant to the case. They do not present facts in the same way that lay witnesses do; instead, they help contextualize evidence by explaining it through their professional lens.

The other options do not accurately reflect the core function of expert witnesses. While they may present evidence and help the jury understand it, their principal role is to clarify and provide insight rather than evaluate credibility or make decisions in the case.