In legal terms, what qualifies as an expert opinion?

An expert opinion is defined as an opinion that is based on specialized knowledge relevant to a specific field or subject matter. This expertise is usually derived from extensive training, education, and experience in that area. Courts often permit expert opinions into evidence because these opinions can assist the court in understanding complex issues that are beyond the knowledge of the average person.

In contrast to general public knowledge, which does not require specialized training, an expert opinion draws on the individual’s proficiency and understanding of the subject, making it admissible under evidentiary rules. It is objective and grounded in factual knowledge rather than personal beliefs or unsubstantiated views. Therefore, opinions that lack a factual basis, such as those formed without foundation or those that stem solely from subjective personal beliefs, do not qualify as expert opinions, as they fail to provide the necessary knowledge that can aid in legal decision-making.