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Idaho 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 prior disclosure of the underlying facts or data, provided that, if requested pursuant to the rules of discovery, the underlying facts or data were disclosed. But the expert may be required to disclose those facts or data on cross-examination.


(Adopted March 26, 2018, effective July 1, 2018.)


As the Third Branch of Government, we provide access to justice through the timely, fair, and impartial resolution of cases.


Members of the
Idaho Supreme Court

Chief Justice G Richard Bevan
Justice Robyn M. Brody
Justice Gregory W. Moeller
Justice Colleen D. Zahn
Justice Cynthia K.C. Meyer

Members of the
Idaho Court of Appeals

Chief Judge David W. Gratton
Judge Molly J Huskey
Judge Jessica M. Lorello



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