# Missouri HB42: Changes the law regarding catalytic converters

Missouri HB42, Changes the law regarding catalytic converters, is a 2025 Regular Session House bill sponsored by Hardy Billington (Republican); status failed, last action 2025-05-05 (SCS Voted Do Pass) (as of 2026-10-16).

- Canonical: https://policyrisk.com/state-bill/MO-HB42-2025
- As of: 2026-10-16
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Missouri HB42
- State: Missouri
- Session: 2025 Regular Session
- Title: Changes the law regarding catalytic converters
- Status: failed
- Chamber: House
- Introduced: 2024-12-02
- Last action: 2025-05-05, SCS Voted Do Pass
- Sponsor: Hardy Billington (Republican)
- Cosponsors: 2
- Touches household money: no
- Roll calls: 3 (171 yes, 8 no in all)
- Economic provisions PRIA read: 0

## Summary

No summary available.

## Bill overview

No economic impacts identified for this bill.

## Sponsors and cosponsors

- Sponsor: Hardy Billington (Republican), House
- Cosponsor: John Hewkin (Republican), House
- Cosponsor: Phil Amato (Republican), House

## Roll call votes

| Date | Chamber | Motion | Result | Yes | No | Other |
| --- | --- | --- | --- | --- | --- | --- |
| 2025-04-02 | House | Third Read and Passed | pass | 146 | 7 | 1 |
| 2025-03-13 | House | Reported Do Pass | pass | 8 | 1 |   |
| 2025-02-27 | House | Reported Do Pass | pass | 17 | 0 |   |

## Actions (24)

- 2025-05-05: SCS Voted Do Pass (Senate)
- 2025-05-05: Executive Session Held (Senate)
- 2025-04-28: Public Hearing Held (Senate)
- 2025-04-25: Public Hearing Scheduled - Monday, April 28, 2025, 2:00 p.m., Senate Committee Room 1 - 1st Floor (Senate)
- 2025-04-10: Second read and referred: Transportation, Infrastructure and Public Safety (Senate)
- 2025-04-03: Reported to the Senate and First Read (Senate)
- 2025-04-02: Third Read and Passed - AYES: 146 NOES: 7 PRESENT: 1 (House)
- 2025-04-02: Taken Up for Third Reading (House)
- 2025-03-26: Perfected (House)
- 2025-03-26: Title of Bill - Agreed To (House)
- 2025-03-26: Taken Up for Perfection (House)
- 2025-03-25: Placed on the Informal Perfection Calendar (House)
- 2025-03-13: Reported Do Pass - AYES: 8 NOES: 1 PRESENT: 0 (House)
- 2025-03-13: Voted Do Pass (House)
- 2025-03-13: Executive Session Completed (House)
- 2025-03-11: Referred: Rules - Legislative (House)
- 2025-02-27: Reported Do Pass - AYES: 17 NOES: 0 PRESENT: 0 (House)
- 2025-02-26: Voted Do Pass (House)
- 2025-02-26: Executive Session Completed (House)
- 2025-02-19: Public Hearing Completed (House)
- 2025-01-22: Referred: Crime and Public Safety (House)
- 2025-01-09: Read Second Time (House)
- 2025-01-08: Read First Time (House)
- 2024-12-02: Prefiled (House)

## Bill text

- Perfected, 2025-03-26: [PDF](https://documents.house.mo.gov/billtracking/bills251/hlrbillspdf/0223H.01P.pdf)
- Introduced, 2025-01-08: [PDF](https://documents.house.mo.gov/billtracking/bills251/hlrbillspdf/0223H.01I.pdf)

## Related bills

- HB3: Appropriates money for the expenses, grants, refunds, and distributions of the Department of Higher Education and Workforce Development (signed)
- HB8: Appropriates money for the expenses, grants, refunds, and distributions of the Department of Public Safety and the Department of National Guard (signed)
- HB11: Appropriates money for the expenses, grants, refunds, and distributions of the Department of Social Services (signed)
- HB10: Appropriates money for the expenses, grants, refunds, and distributions of the Department of Mental Health, the Department of Health and Senior Services, and t… (signed)
- SB79: Modifies provisions relating to health care (signed)
- SB271: Modifies provisions relating to emergency services (signed)

## Sources
- [Perfected (PDF)](https://documents.house.mo.gov/billtracking/bills251/hlrbillspdf/0223H.01P.pdf)
- [Introduced (PDF)](https://documents.house.mo.gov/billtracking/bills251/hlrbillspdf/0223H.01I.pdf)

## Related
- [HB3: Appropriates money for the expenses, grants, refunds, and distributions of the…](https://policyrisk.com/state-bill/MO-HB3-2025)
- [HB8: Appropriates money for the expenses, grants, refunds, and distributions of the…](https://policyrisk.com/state-bill/MO-HB8-2025)
- [HB11: Appropriates money for the expenses, grants, refunds, and distributions of the…](https://policyrisk.com/state-bill/MO-HB11-2025)
- [HB10: Appropriates money for the expenses, grants, refunds, and distributions of the…](https://policyrisk.com/state-bill/MO-HB10-2025)
- [SB79: Modifies provisions relating to health care](https://policyrisk.com/state-bill/MO-SB79-2025)
- [SB271: Modifies provisions relating to emergency services](https://policyrisk.com/state-bill/MO-SB271-2025)
- [Missouri bills](https://policyrisk.com/states/missouri/bills)
- [Missouri state hub](https://policyrisk.com/states/missouri)
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Source: PRIA, https://policyrisk.com/state-bill/MO-HB42-2025 (as of 2026-10-16).