Question

which of the following describes expert witness testimony? (choose all that apply.)
a. testimony designed to assist the jury in determining matters beyond the ordinary persons scope of knowledge
b. testimony that defines issues of the case for determination by the jury
c. testimony resulting in the expression of an opinion by a witness with scientific, technical, or other professional knowledge or experience
d. testimony designed to raise doubt about facts or witnesses credibility

Explanation:

Expert witness testimony focuses on specialized knowledge to aid juries with matters outside common understanding, and involves giving opinions based on professional/technical expertise. Option b describes the role of opening statements or jury instructions, not expert testimony. Option d describes impeachment testimony, not expert witness testimony.

Answer:

a. Testimony designed to assist the jury in determining matters beyond the ordinary person's scope of knowledge
c. Testimony resulting in the expression of an opinion by a witness with scientific, technical, or other professional knowledge or experience