---
type: "Bill"
title: "Improving diversity in clinical trials."
description: "Improving diversity in clinical trials."
jurisdiction: "us/states/wa"
legislature: "Washington Legislature"
session: "2023-2024"
identifier: "HB 1745"
citation: "Washington HB 1745 (2023-2024)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Thai"]
version_count: 4
action_count: 37
vote_count: 3
first_action: "2023-02-03"
last_action: "2023-05-11"
source: "openstates"
source_identifier: "ocd-bill/cad5e8de-6a6d-4c09-b9fa-137430b85f95"
source_url: "http://apps.leg.wa.gov/billinfo/summary.aspx?bill=1745&year=2023"
source_hash: "aa2da26e09afef58741eed1f368b3bd1bc96a38418df378c09025b73f55f82b4"
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-wa"]
---

# Washington HB 1745 (2023-2024) — Improving diversity in clinical trials.

## Version chain

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

1. **Bill** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2023-24/Htm/Bills/House%20Bills/1745.htm)
2. **Second Substitute Bill** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2023-24/Htm/Bills/House%20Bills/1745-S2.htm)
3. **Second Substitute Passed Legislature** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2023-24/Htm/Bills/House%20Passed%20Legislature/1745-S2.PL.htm)
4. **Substitute Bill** (committee substitute) — [source](http://lawfilesext.leg.wa.gov/Biennium/2023-24/Htm/Bills/House%20Bills/1745-S.htm)

## Votes

- 3rd Reading & Final Passage (#18) — **95–0** (pass) · lower
- Final Passage as Amended by the Senate (#7) — **98–0** (pass) · lower
- 3rd Reading & Final Passage as Amended by the Senate (#32) — **49–0** (pass) · upper

## Sponsors

- Thai — primary (person)
- Doglio — cosponsor (person)
- Duerr — cosponsor (person)
- Macri — cosponsor (person)
- Ormsby — cosponsor (person)

## Timeline

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

- **2023-02-03** First reading, referred to Health Care & Wellness. `reading-1`
- **2023-02-14** Public hearing in the House Committee on Health Care & Wellness at 1:30 PM.
- **2023-02-17** Executive action taken in the House Committee on Health Care & Wellness at 8:00 AM.
- **2023-02-17** HCW - Majority; 1st substitute bill be substituted, do pass. `substitution`
- **2023-02-17** Referred to Appropriations. `referral-committee`
- **2023-02-23** Public hearing in the House Committee on Appropriations at 9:00 AM.
- **2023-02-24** Executive action taken in the House Committee on Appropriations at 9:00 AM.
- **2023-02-24** APP - Majority; 2nd substitute bill be substituted, do pass. `substitution`
- **2023-02-24** Referred to Rules 2 Review. `referral-committee`
- **2023-03-04** Rules Committee relieved of further consideration. Placed on second reading. `reading-2`
- **2023-03-06** 2nd substitute bill substituted (APP 23). `substitution`
- **2023-03-06** Rules suspended. Placed on Third Reading. `reading-3`
- **2023-03-06** Third reading, passed; yeas, 95; nays, 0; absent, 0; excused, 3. `reading-3`
- **2023-03-08** First reading, referred to Health & Long Term Care. `reading-1`
- **2023-03-17** Public hearing in the Senate Committee on Health & Long Term Care at 8:00 AM.
- **2023-03-23** Executive action taken in the Senate Committee on Health & Long Term Care at 10:30 AM.
- **2023-03-23** HLTC - Majority; do pass with amendment(s). `committee-passage-favorable`
- **2023-03-23** And refer to Ways & Means. `referral-committee`
- **2023-03-24** Referred to Ways & Means. `referral-committee`
- **2023-03-30** Public hearing in the Senate Committee on Ways & Means at 12:30 PM.
- **2023-04-03** Executive action taken in the Senate Committee on Ways & Means at 10:00 AM.
- **2023-04-03** WM - Majority; do pass with amendment(s). `committee-passage-favorable`
- **2023-04-03** Minority; without recommendation. `committee-passage-unfavorable`
- **2023-04-04** Passed to Rules Committee for second reading.
- **2023-04-11** Placed on second reading by Rules Committee. `reading-2`
- **2023-04-12** Committee amendment not adopted. `amendment-failure`
- **2023-04-12** Floor amendment(s) adopted.
- **2023-04-12** Rules suspended. Placed on Third Reading. `reading-3`
- **2023-04-12** Third reading, passed; yeas, 49; nays, 0; absent, 0; excused, 0. `reading-3`
- **2023-04-19** House concurred in Senate amendments.
- **2023-04-19** Passed final passage; yeas, 98; nays, 0; absent, 0; excused, 0. `passage`
- **2023-04-20** Speaker signed. `passage`
- **2023-04-20** President signed. `passage`
- **2023-04-21** Delivered to Governor. `executive-receipt`
- **2023-05-11** Governor signed. `executive-signature`
- **2023-05-11** Chapter 426, 2023 Laws. `became-law`
- **2023-05-11** Effective date 7/23/2023. `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/cad5e8de-6a6d-4c09-b9fa-137430b85f95`. Confidence: reported (aggregated from official Washington legislature records).