Opinion testimony

Definition
: testimony relaying opinion as opposed to direct knowledge of the facts at issue
Opinion testimony may be allowed in evidence when it helps the factfinder understand or determine the facts at issue. Such testimony by a lay witness must be rationally based on his or her perception. A qualified expert witness may also give opinion testimony. The expert's opinion may be based on facts or data that he or she perceives directly or of which he or she is made aware other than by direct perception at or before trial.



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Based on Merriam-Webster's Dictionary of Law ©2001.
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collateral estoppel

estoppel by judgment barring the relitigation of issues litigated by the same parties on a different cause of action


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