---
type: "Bill"
title: "Mental health: involuntary treatment."
description: "Mental health: involuntary treatment."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20012002"
identifier: "AB 1421"
citation: "California AB 1421 (20012002)"
classification: ["bill"]
subjects: ["Mental health: involuntary treatment."]
status: "enacted"
primary_sponsors: ["Thomson"]
version_count: 13
action_count: 41
vote_count: 10
first_action: "2001-02-23"
last_action: "2002-09-28"
source: "openstates"
source_identifier: "ocd-bill/41bad147-99b9-43ac-afd8-54ace250967e"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=200120020AB1421"
source_hash: "65f9b8104f54ba280c24cf00ef4b8f82ede14e37b5d591b96c5c91a0bbbee271"
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 1421 (20012002) — Mental health: involuntary treatment.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **02/23/01 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142199INT)
2. **04/04/02 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142194AMD)
3. **04/05/01 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142198AMD)
4. **04/30/01 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142197AMD)
5. **05/17/01 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142196AMD)
6. **06/04/01 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142195AMD)
7. **06/29/02 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142193AMD)
8. **08/12/02 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142192AMD)
9. **08/22/02 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142191AMD)
10. **08/26/02 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142190AMD)
11. **09/28/02 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142188CHP)
12. **AB1421** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=200120020AB1421)
13. **08/29/02 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200120020AB1421&version=20010AB142189ENR)

## Votes

- Do pass as amended. — **pass** (pass) · upper
- AB 1421 Thomson Concurrence in Senate Amendments — **pass** (pass) · lower
- Assembly 3rd Reading AB1421 Thomson By Kuehl — **pass** (pass) · upper
- Do pass as amended. — **pass** (pass) · lower
- Do pass as amended and be re-referred to the Committee on Appropriations. — **pass** (pass) · lower
- Do pass and be re-referred to the Committee on Judiciary. — **pass** (pass) · lower
- Do pass as amended, and re-refer to the Committee on Rules. — **pass** (pass) · upper
- AB 1421 Thomson Assembly Third Reading — **pass** (pass) · lower
- Do pass, but re-refer to the Committee on Appropriations. — **pass** (pass) · upper
- Placed on Appropriations Suspense file. — **pass** (pass) · upper

## Sponsors

- Thomson — primary (person)
- Aanestad — coauthor (person)
- Canciamilla — coauthor (person)
- Dutra — coauthor (person)
- Jackson — coauthor (person)
- Koretz — coauthor (person)
- Longville — coauthor (person)
- Perata — principal coauthor (person)
- Richman — coauthor (person)
- Salinas — coauthor (person)
- Wyland — coauthor (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2002-09-28** Chaptered by Secretary of State - Chapter 1017, Statutes of 2002.
- **2002-09-28** Approved by the Governor. `executive-signature`
- **2002-09-10** Enrolled and to the Governor at 11:30 a.m.
- **2002-08-29** Assembly Rule 77 suspended. Senate amendments concurred in. To enrollment. (Ayes 73. Noes 4. Page 8490.) `committee-passage-favorable, amendment-passage`
- **2002-08-28** In Assembly. Concurrence in Senate amendments pending. May be considered on or after August 30 pursuant to Assembly Rule 77.
- **2002-08-28** Read third time, passed, and to Assembly. (Ayes 27. Noes 8. Page 5893.) `passage, reading-1, reading-3`
- **2002-08-27** Read second time. To third reading. `reading-2, reading-1`
- **2002-08-26** Read third time, amended. To second reading. `reading-1, amendment-passage, reading-3`
- **2002-08-22** From committee: Amend, and do pass as amended. (Ayes 7. Noes 2.). Read second time and amended. Ordered to third reading. `reading-2, reading-1, committee-passage, amendment-introduction, amendment-passage`
- **2002-08-20** In committee: Placed on Appropriations suspense file.
- **2002-08-14** From committee: Do pass, and re-refer to Standing Committee on Appropriations Re-referred. (Ayes 4. Noes 2.). `committee-passage-favorable, referral-committee, committee-passage`
- **2002-08-12** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Standing Committee on Judiciary. `reading-1, referral-committee, reading-2, amendment-introduction, amendment-passage`
- **2002-08-08** Joint Rule 61(b)(12) suspended. (Page 5330.)
- **2002-08-06** In committee: Hearing postponed by committee.
- **2002-08-06** Withdrawn from committee. Re-referred to Standing Committee on Judiciary. `referral-committee`
- **2002-07-11** (Corrected July 10. )
- **2002-06-29** Read second time, amended, and re-referred to Standing Committee on Rules. `reading-2, reading-1, referral-committee, amendment-passage`
- **2002-06-28** From committee: Amend, do pass as amended, and re-refer to Standing Committee on Rules (Ayes 7. Noes 0.). `amendment-introduction, referral-committee, committee-passage, amendment-passage`
- **2002-06-12** In committee: Hearing postponed by committee.
- **2002-04-04** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on H. & H.S. `reading-1, referral-committee, reading-2, amendment-introduction, amendment-passage`
- **2001-06-25** In committee: Set, first hearing. Hearing canceled at the request of author.
- **2001-06-19** Referred to H. & H.S. and Standing Committee on Judiciary. `referral-committee`
- **2001-06-07** In Senate. Read first time. To Standing Committee on Rules for assignment. `reading-1`
- **2001-06-06** Read third time, passed, and to Senate. (Ayes 65. Noes 1. Page 2271.) `passage, reading-1, reading-3`
- **2001-06-05** Read second time. To third reading. `reading-2, reading-1`
- **2001-06-04** From committee: Amend, and do pass as amended. (Ayes 20. Noes 0.) (May 31). Read second time and amended. Ordered returned to second reading. `reading-2, reading-1, committee-passage, amendment-introduction, amendment-passage`
- **2001-05-30** In committee: Set, first hearing. Referred to Standing Committee on Appropriations suspense file. `referral-committee`
- **2001-05-29** Joint Rule 62(a), file notice waived. (Page 1856.)
- **2001-05-21** Re-referred to Standing Committee on Appropriations. `referral-committee`
- **2001-05-17** Read second time and amended. `reading-2, amendment-passage, reading-1`
- **2001-05-16** From committee: Amend, do pass as amended, and re-refer to Standing Committee on Appropriations (Ayes 7. Noes 0.) (May 8). `amendment-introduction, referral-committee, committee-passage, amendment-passage`
- **2001-05-02** Re-referred to Standing Committee on Judiciary. `referral-committee`
- **2001-04-30** From committee chair, with author's amendments: Amend, and re-refer to Standing Committee on Judiciary Read second time and amended. `reading-2, referral-committee, reading-1, amendment-introduction, amendment-passage`
- **2001-04-26** Joint Rule 61(a)(2) suspended. (Page 1245.)
- **2001-04-18** From committee: Do pass, and re-refer to Standing Committee on Judiciary Re-referred. (Ayes 11. Noes 0.) (April 17). `committee-passage-favorable, referral-committee, committee-passage`
- **2001-04-16** Re-referred to Standing Committee on Health. `referral-committee`
- **2001-04-05** From committee chair, with author's amendments: Amend, and re-refer to Standing Committee on Health. Read second time and amended. `reading-2, referral-committee, reading-1, amendment-introduction, amendment-passage`
- **2001-04-05** Referred to Standing Committee on Health and Standing Committee on Judiciary. `referral-committee`
- **2001-02-26** Read first time. `reading-1`
- **2001-02-25** From printer. May be heard in committee March 27.
- **2001-02-23** Introduced. To print. `introduction`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/41bad147-99b9-43ac-afd8-54ace250967e`. Confidence: reported (aggregated from official California legislature records).