Article 1. Expert and Other Opinion Testimony Generally - California Evidence Code Section 800

800.  If a witness is not testifying as an expert, his testimony in
the form of an opinion is limited to such an opinion as is permitted
by law, including but not limited to an opinion that is:
   (a) Rationally based on the perception of the witness; and
   (b) Helpful to a clear understanding of his testimony.

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Last modified: February 16, 2015