Fabio
90 lines
6.2 KiB
Markdown
90 lines
6.2 KiB
Markdown
---
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type: "Bill"
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title: "Evidence: expert testimony."
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description: "Existing law authorizes an expert witness to testify in the form of an opinion, if the opinion is sufficiently beyond the common experience such that it would assist the trier of fact and if the opinion is based on matter, whether or not admissible, that is known to the witness prior to their testimony and that may reasonably be relied upon by an expert in forming their opinion in the matter, unless the witness is precluded by law from using those reasons or matter as a basis for the opinion."
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jurisdiction: "us/states/ca"
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legislature: "California Legislature"
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session: "20232024"
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identifier: "SB 652"
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citation: "California SB 652 (20232024)"
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classification: ["bill"]
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subjects: ["Evidence", "expert testimony"]
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status: "enacted"
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primary_sponsors: ["Umberg"]
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version_count: 7
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action_count: 23
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vote_count: 5
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first_action: "2023-02-16"
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last_action: "2023-07-13"
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source: "openstates"
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source_identifier: "ocd-bill/f802b82c-fddb-4b02-a8da-90eaf9269533"
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source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240SB652"
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source_hash: "9b056adc7541a21b0e3d54799ba0de1d21b75406bb97666137d4d9811ce357a3"
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vintage: "2026-07-01"
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source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
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retrieved_at: "2026-07-06"
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confidence: "reported"
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tags: ["legislation", "bill", "us-ca"]
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---
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# California SB 652 (20232024) — Evidence: expert testimony.
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Existing law authorizes an expert witness to testify in the form of an opinion, if the opinion is sufficiently beyond the common experience such that it would assist the trier of fact and if the opinion is based on matter, whether or not admissible, that is known to the witness prior to their testimony and that may reasonably be relied upon by an expert in forming their opinion in the matter, unless the witness is precluded by law from using those reasons or matter as a basis for the opinion.
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## Version chain
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The bill's text revisions, in order — the diff chain from filing to enrollment.
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1. **02/16/23 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB652&version=20230SB65299INT)
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2. **03/20/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB652&version=20230SB65298AMD)
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3. **04/13/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB652&version=20230SB65297AMD)
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4. **06/08/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB652&version=20230SB65296AMD)
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5. **07/13/23 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB652&version=20230SB65294CHP)
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6. **SB652** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240SB652)
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7. **06/23/23 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB652&version=20230SB65295ENR)
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## Votes
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- Do pass as amended, but first amend, and re-refer to the Committee on [Public Safety] with the recommendation: To Consent Calendar — **10–0** (pass) · upper
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- Do pass as amended. To Consent Calendar. — **11–0** (pass) · lower
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- 3rd Reading — **36–0** (pass) · upper
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- Special Consent — **39–0** (pass) · upper
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- SB 652 Umberg Consent Calendar Second Day — **74–0** (pass) · lower
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## Sponsors
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- Umberg — primary (person)
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## Timeline
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The legislative action history — every referral, reading, and vote.
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- **2023-02-16** Introduced. Read first time. To Com. on RLS. for assignment. To print. `introduction, reading-1`
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- **2023-02-17** From printer. May be acted upon on or after March 19.
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- **2023-03-01** Referred to Coms. on JUD. and PUB S. `referral-committee`
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- **2023-03-20** From committee with author's amendments. Read second time and amended. Re-referred to Com. on JUD. `amendment-passage, committee-passage, reading-1, reading-2, referral-committee`
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- **2023-03-21** Set for hearing April 11.
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- **2023-04-12** From committee: Do pass as amended and re-refer to Com. on PUB S. with recommendation: To consent calendar. (Ayes 10. Noes 0. Page 687.) (April 11). `amendment-passage, committee-passage, committee-passage-favorable`
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- **2023-04-13** Read second time and amended. Re-referred to Com. on PUB S. `amendment-passage, reading-1, reading-2, referral-committee`
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- **2023-04-17** Withdrawn from committee.
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- **2023-04-17** Ordered to second reading.
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- **2023-04-18** Read second time. Ordered to third reading. `reading-1, reading-2`
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- **2023-05-08** Read third time. Passed. (Ayes 36. Noes 0. Page 1021.) Ordered to the Assembly. `passage, reading-1, reading-3`
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- **2023-05-08** In Assembly. Read first time. Held at Desk. `reading-1`
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- **2023-05-18** Referred to Com. on JUD. `referral-committee`
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- **2023-06-07** From committee: Do pass as amended. Ordered to consent calendar. (Ayes 11. Noes 0.) (June 6). `amendment-passage, committee-passage, committee-passage-favorable`
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- **2023-06-08** Read second time and amended. Ordered to second reading. `amendment-passage, reading-1, reading-2`
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- **2023-06-12** Read second time. Ordered to consent calendar. `reading-1, reading-2`
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- **2023-06-15** Read third time. Passed. (Ayes 74. Noes 0. Page 2266.) Ordered to the Senate. `passage, reading-1, reading-3`
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- **2023-06-15** In Senate. Concurrence in Assembly amendments pending.
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- **2023-06-20** Ordered to special consent calendar.
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- **2023-06-22** Assembly amendments concurred in. (Ayes 39. Noes 0. Page 1683.) Ordered to engrossing and enrolling. `amendment-passage, committee-passage-favorable`
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- **2023-07-05** Enrolled and presented to the Governor at 4 p.m.
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- **2023-07-13** Approved by the Governor. `executive-signature`
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- **2023-07-13** Chaptered by Secretary of State. Chapter 75, Statutes of 2023. `became-law`
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## Source
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OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/f802b82c-fddb-4b02-a8da-90eaf9269533`. Confidence: reported (aggregated from official California legislature records).
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