Which statement best describes an expert witness?

• A. The opinion should be based on specialized knowledge not within common experience of lay jurors
• B. The opinion should be based on personal beliefs
• C. The opinion should be formed using experiments only
• D. The opinion should be kept confidential

Answer: (A)

An expert witness provides opinions grounded in specialized knowledge, training, or experience that go beyond what lay jurors would typically know. In forensic contexts, this means applying validated methods, data, and standards from a field like digital forensics to interpret evidence and explain it clearly to the court. This is exactly what the statement captures: the opinion should be based on specialized knowledge not within common experience of lay jurors, which is the essence of why an expert witness is called. Personal beliefs aren’t a basis for expert testimony, because the court relies on objective analysis rather than subjective views. Opinions aren’t limited to experiments alone, since expert conclusions can come from a combination of analysis, documentation, evidence, and validated procedures. And testimony isn’t kept confidential; it’s presented in court and subject to scrutiny.