LawWiki
HomeCodesSearchGlossaryAPIAbout
LawWiki

Plain English summaries of California law with zero-hallucination AI. Every summary is verified against official source text.

Product

  • Search
  • Codes
  • About

Legal

  • Privacy Policy
  • Terms of Service
  • Disclaimer

© 2026 LawWiki. All rights reserved.

HomeEvidence CodeDiv. 7Ch. 1Art. 1§ 800 Witness Opinion Testimony Limits

§ 800 Witness Opinion Testimony Limits

Evidence Code·California
AI Summary·Official Text·Key Terms·Related Statutes·References
AI SummaryVerified

§ 800 Witness Opinion Testimony Limits

Key Takeaways

  • •If someone saw something happen, they can tell the court what they think about it, but only if it's based on what they actually saw.
  • •Their opinion must help the court understand their story better.
  • •They can't give expert opinions unless they're an expert witness.

Example

You see a car crash at an intersection.

You can tell the court you think the red car was speeding because it looked like it was going really fast when it hit the blue car. But you can't say how fast it was going exactly unless you're a car crash expert.

AI-generated — May contain errors. Not legal advice. Always verify source.

Official Source
View on CA.gov

§ 800 Witness Opinion Testimony Limits

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. (Enacted by Stats. 1965, Ch. 299.)

Last verified: January 22, 2026

Key Terms

witnesstestifying as an expertopinionrationally based on the perception of the witnesshelpful to a clear understanding of his testimony

Related Statutes

  • § 802 Expert Witness Opinion Basis
  • § 803 Expert Opinion Evidence Rules
  • § 805 Expert Opinion On Ultimate Issue
  • § 1400 Writing Authentication Rules
  • § 1401 Writing Authentication Requirement

References

  • Official text at leginfo.legislature.ca.gov
  • California Legislature. Evidence Code. Section 800.
View Official Source