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General/Miscellaneous - Rules of Evidence - Rule 705. Disclosing the Facts or Data Underlying an Expert's 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 cross-examination. 2016 NHRE Update Committee Note The amendment made by supreme court order dated April 20, 2017, effective July 1, 2017, made stylistic and substantive changes to the rule. For additional guidance regarding changes to the rule see the notes following Federal Rules of Evidence 705 (Notes of Advisory Committee on 1993 amendment).