In expert witness criteria, which option expresses the requirement that opinions rely on specialized knowledge?

• A. The Opinion, inferences or conclusions depend on special knowledge, skill or training not within the ordinary experience of lay jurors
• B. To stimulate discussion between the consulting expert and the expert witness
• C. To define the issues of the case for determination by the finder of fact
• D. To deter the witness from expanding the scope of his or her investigation beyond the requirements of the case

Answer: (A)

In expert testimony, opinions must come from specialized knowledge that goes beyond what a layperson could reasonably understand. The statement expressed here says that the opinion, inferences, or conclusions depend on special knowledge, skill or training not within the ordinary experience of lay jurors. That directly captures why an expert is qualified to testify: their conclusions rest on formal training, experience, and methods that non-experts don’t possess, making the testimony helpful and admissible to the fact-finder. In digital forensics, for example, a trained examiner applies validated procedures and tools to interpret data, which a typical juror couldn’t reliably do. The other options describe purposes like stimulating discussion, defining issues, or constraining scope, none of which address the requirement that the opinion itself rests on specialized expertise.