{"code":"EVID","codeName":"Evidence Code","section":"803","citation":"Evid. Code, § 803","status":"in-force","lawOn":"2026-09-28","headings":[{"name":"DIVISION 7. OPINION TESTIMONY AND SCIENTIFIC EVIDENCE [800. - 870.]","url":"https://blackletter.si/evidence-code/division-7"},{"name":"CHAPTER 1. Expert and Other Opinion Testimony [800. - 870.]","url":"https://blackletter.si/evidence-code/division-7/chapter-1"},{"name":"ARTICLE 1. Expert and Other Opinion Testimony Generally [800. - 805.]","url":"https://blackletter.si/evidence-code/division-7/chapter-1/article-1"}],"history":"Enacted by Stats. 1965, Ch. 299.","effective":null,"html":"<p>The court may, and upon objection shall, exclude testimony in the form of an opinion that is based in whole or in significant part on matter that is not a proper basis for such an opinion. In such case, the witness may, if there remains a proper basis for his opinion, then state his opinion after excluding from consideration the matter determined to be improper.</p>","text":"The court may, and upon objection shall, exclude testimony in the form of an opinion that is based in whole or in significant part on matter that is not a proper basis for such an opinion. In such case, the witness may, if there remains a proper basis for his opinion, then state his opinion after excluding from consideration the matter determined to be improper.","otherVersions":[],"url":"https://blackletter.si/evidence-code/expert-and-other-opinion-testimony-generally-803","source":"California Legislative Information bulk export (pubinfo)"}