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---
type: "Bill"
title: "Cancer Prevention Act."
description: "Existing law prohibits the governing authority of a school or other institution from unconditionally admitting any person as a pupil of any private or public elementary or secondary school, childcare center, day nursery, nursery school, family daycare home, or development center, unless prior to their admission to that institution they have been fully immunized. Existing law requires the documentation of immunizations for certain diseases, including, among others, measles, mumps, pertussis, and any other disease deemed appropriate by the State Department of Public Health, as specified. Existing law authorizes certain exemptions from these provisions subject to specified conditions."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20232024"
identifier: "AB 659"
citation: "California AB 659 (20232024)"
classification: ["bill"]
subjects: ["Cancer Prevention Act"]
status: "enacted"
primary_sponsors: ["Aguiar-Curry"]
version_count: 10
action_count: 33
vote_count: 9
first_action: "2023-02-09"
last_action: "2023-10-13"
source: "openstates"
source_identifier: "ocd-bill/bea74a03-3778-46bf-8401-2a5909fc0f19"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB659"
source_hash: "3eeacd5acbe2e35db163e9f4d03bedd88d856d5ef731a79974994f7df7e3bf73"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-ca"]
---
# California AB 659 (20232024) — Cancer Prevention Act.
Existing law prohibits the governing authority of a school or other institution from unconditionally admitting any person as a pupil of any private or public elementary or secondary school, childcare center, day nursery, nursery school, family daycare home, or development center, unless prior to their admission to that institution they have been fully immunized. Existing law requires the documentation of immunizations for certain diseases, including, among others, measles, mumps, pertussis, and any other disease deemed appropriate by the State Department of Public Health, as specified. Existing law authorizes certain exemptions from these provisions subject to specified conditions.
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **02/09/23 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65999INT)
2. **02/17/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65998AMD)
3. **03/21/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65997AMD)
4. **04/12/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65996AMD)
5. **05/22/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65995AMD)
6. **07/03/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65994AMD)
7. **09/08/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65993AMD)
8. **10/13/23 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65991CHP)
9. **AB659** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB659)
10. **09/18/23 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB659&version=20230AB65992ENR)
## Votes
- Do pass, but first be re-referred to the Committee on [Appropriations] — **52** (pass) · upper
- 3rd Reading AB659 Aguiar-Curry et al. By Wiener — **326** (pass) · upper
- Do pass and be re-referred to the Committee on [Appropriations] — **104** (pass) · lower
- AB 659 Aguiar-Curry Assembly Third Reading — **5914** (pass) · lower
- AB 659 Aguiar-Curry Concurrence in Senate Amendments — **6013** (pass) · lower
- Do pass as amended, but first amend, and re-refer to the Committee on [Education] — **101** (pass) · upper
- Placed on suspense file — **70** (pass) · upper
- Do pass. — **114** (pass) · lower
- Do pass — **52** (pass) · upper
## Sponsors
- Aguiar-Curry — primary (person)
- Blanca Rubio — coauthor (person)
- Friedman — coauthor (person)
- Kalra — coauthor (person)
- Ortega — coauthor (person)
- Papan — coauthor (person)
- Wendy Carrillo — coauthor (person)
- Wiener — coauthor (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2023-02-09** Read first time. To print. `reading-1`
- **2023-02-10** From printer. May be heard in committee March 12.
- **2023-02-17** Referred to Com. on HEALTH. `referral-committee`
- **2023-02-17** From committee chair, with author's amendments: Amend, and re-refer to Com. on HEALTH. Read second time and amended. `amendment-introduction, amendment-passage, reading-1, reading-2`
- **2023-02-21** Re-referred to Com. on HEALTH. `referral-committee`
- **2023-03-21** From committee chair, with author's amendments: Amend, and re-refer to Com. on HEALTH. Read second time and amended. `amendment-introduction, amendment-passage, reading-1, reading-2`
- **2023-03-22** Re-referred to Com. on HEALTH. `referral-committee`
- **2023-03-23** In committee: Hearing postponed by committee.
- **2023-04-12** From committee chair, with author's amendments: Amend, and re-refer to Com. on HEALTH. Read second time and amended. `amendment-introduction, amendment-passage, reading-1, reading-2`
- **2023-04-17** Re-referred to Com. on HEALTH. `referral-committee`
- **2023-04-19** From committee: Do pass and re-refer to Com. on APPR. (Ayes 10. Noes 4.) (April 18). Re-referred to Com. on APPR. `committee-passage, committee-passage-favorable, referral-committee`
- **2023-05-03** In committee: Hearing postponed by committee.
- **2023-05-10** In committee: Hearing postponed by committee.
- **2023-05-17** From committee: Do pass. (Ayes 11. Noes 4.) (May 17). `committee-passage, committee-passage-favorable`
- **2023-05-18** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-05-22** Read third time and amended. Ordered to third reading. (Page 1683.) `amendment-passage, reading-1, reading-3`
- **2023-05-31** Read third time. Passed. Ordered to the Senate. (Ayes 59. Noes 14. Page 1958.) `passage, reading-1, reading-3`
- **2023-06-01** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2023-06-14** Referred to Coms. on HEALTH and ED. `referral-committee`
- **2023-06-29** From committee: Amend, and do pass as amended and re-refer to Com. on ED. (Ayes 10. Noes 1.) (June 28). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2023-07-03** Read second time and amended. Re-referred to Com. on ED. `amendment-passage, reading-1, reading-2, referral-committee`
- **2023-07-13** From committee: Do pass and re-refer to Com. on APPR. (Ayes 5. Noes 2.) (July 12). Re-referred to Com. on APPR. `committee-passage, committee-passage-favorable, referral-committee`
- **2023-08-21** In committee: Referred to APPR suspense file. `referral-committee`
- **2023-09-01** From committee: Do pass. (Ayes 5. Noes 2.) (September 1). `committee-passage, committee-passage-favorable`
- **2023-09-05** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-09-08** Read third time and amended. Ordered to second reading. `amendment-passage, reading-1, reading-3`
- **2023-09-11** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-09-12** Read third time. Passed. Ordered to the Assembly. (Ayes 32. Noes 6. Page 2644.). `passage, reading-1, reading-3`
- **2023-09-12** In Assembly. Concurrence in Senate amendments pending.
- **2023-09-13** Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 60. Noes 13. Page 3387.). `amendment-passage, committee-passage-favorable`
- **2023-09-20** Enrolled and presented to the Governor at 4 p.m.
- **2023-10-13** Approved by the Governor. `executive-signature`
- **2023-10-13** Chaptered by Secretary of State - Chapter 809, Statutes of 2023. `became-law`
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/bea74a03-3778-46bf-8401-2a5909fc0f19`. Confidence: reported (aggregated from official California legislature records).