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Rule 703. Bases of an Expert’s OpinionTestimony


An expert may base an opinion on factsor data in the case that the expert has been made aware of or personallyobserved. If experts in the particular field would reasonably rely on thosekinds of facts or data in forming an opinion on the subject, they need not beadmissible for the opinion to be admitted. But if the facts or data wouldotherwise be inadmissible, the proponent of the opinion may disclose them tothe jury only if their probative value in helping the jury evaluate the opinionsubstantially outweighs their prejudicial effect.



2011 Advisory Committee Note. – The language of this rule has beenamended as part of the restyling of the Evidence Rules to make them more easilyunderstood and to make style and terminology consistent throughout the rules.These changes are intended to be stylistic only. There is no intent to changeany result in any ruling on evidence admissibility. This rule is the federalrule, verbatim.




This rule isthe federal rule, verbatim. The 2009 amendment adopts changes made to FederalRule of Evidence 703 effective December 1, 2000.