Rule 705 Disclosing the Facts or Data Underlying an Expert’s Opinion
OPINIONS AND EXPERT TESTIMONY
(a) Disclosure of Facts and Data Underlying an Expert Opinion. Unless the court orders otherwise, an expert may state an opinion — and give the reasons for it — without first testifying to the underlying facts or data. But the expert may be required to disclose those facts or data on crossexamination.
(b) Objection. An adverse party may object to the testimony of an expert on the ground that the expert does not have a sufficient basis for expressing an opinion. The adverse party may, before the witness gives an opinion, be allowed to conduct a voir dire examination directed to the underlying facts or data on which the opinion is based.