DISCLOSURE OF FACTS OR DATA UNDERLYING EXPERT OPINION
The expert may testify in terms of opinion or inference and give reasons therefor without first testifying to the underlying facts or data, unless the court requires otherwise. The expert may in any event be required to disclose the underlying facts or data on cross-examination.
The rule is identical to the federal rule. It differs from former Rule 43(m)(4), SCRCP, and former Rule 24(d), SCRCrimP, which contained the phrase "without prior disclosure of" in place of the phrase "without first testifying to."