BASIS OF EXPERT TESTIMONY (Rule 2:703(a) derived from Code § 8.01-

401.1) (a) Civil cases. In a civil action an expert witness may give testimony and render an opinion or draw inferences from facts, circumstances, or data made known to or perceived by such witness at or before the hearing or trial during which the witness is called upon to testify. The facts, circumstances, or data relied upon b y such witness in forming an opinion or drawing inferences, if of a t ype normally relied upon by others in the particular field of expertise in forming opinions and drawing inferences, need not be admissible in evidence. (b) Criminal cases. In criminal cases, the opinion of an expert is generally admissible if it is based upon facts personally known or observed by the expert, or based upon facts in evidence. Adopted and promulgated by Order dated June 1, 2012; effective July 1, 2012. RULES OF SUPREME COURT OF VIRGINIA PART TWO VIRGINIA RULES OF EVIDENCE ARTICLE VII. OPINIONS AND EXPERT TESTIMONY