Many lawyers use the terms “supplemental expert” and “rebuttal expert” interchangeably, but, according to the Discovery Act, they are very different. A supplemental expert is one that was disclosed twenty days after experts have been disclosed and is pursuant to Code of Civil Procedure section 2034.280 and is allowed to provide expert testimony. However, a rebuttal expert’s testimony is limited to rebutting or contradicting an opponent’s expert’s “foundational facts” that form the basis of their opinion. Continue Reading Rebuttal Expert Witnesses—Do you know how to use them?