--- type: "Bill" title: "Generally revise driving under the influence laws for THC levels in drivers under 21" description: "Generally revise driving under the influence laws for THC levels in drivers under 21" jurisdiction: "us/states/mt" legislature: "Montana Legislature" session: "2025" identifier: "SB 508" citation: "Montana SB 508 (2025)" classification: ["bill"] subjects: ["Alcohol", "Law Enforcement", "Motor Vehicles"] status: "enacted" primary_sponsors: ["Willis Curdy"] version_count: 16 action_count: 37 vote_count: 6 first_action: "2024-12-14T18:09:30+00:00" last_action: "2025-05-08T14:26:15+00:00" source: "openstates" source_identifier: "ocd-bill/56b9283d-5a8c-4744-884b-6726c048a16c" source_url: "https://bills.legmt.gov/#/laws/bill/2/LC3514?open_tab=sum" source_hash: "ef85a5970e665020b52af61c391f7ded626e390bd0b52a6765ce039167be4248" 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-mt"] --- # Montana SB 508 (2025) — Generally revise driving under the influence laws for THC levels in drivers under 21 ## Version chain The bill's text revisions, in order — the diff chain from filing to enrollment. 1. **LC3514.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=283825) 2. **SB0508_1(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=293549) 3. **SB0508_1(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=293705) 4. **SB0508_1(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=307231) 5. **SB0508_1(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=309275) 6. **SB0508_1(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=309277) 7. **SB0508_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=287914) 8. **SB0508_X(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=316932) 9. **SB0508_X(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=320507) 10. **SB0508_X(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=322014) 11. **SB0508_X(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=322015) 12. **SB0508_X(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=322016) 13. **SB0508_X(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=324778) 14. **SB0508_X(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=326885) 15. **SB0508_X(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=327813) 16. **SB0508_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=310996) ## Votes - Do Pass — **42–7** (pass) · upper - Do Concur — **61–39** (pass) · lower - Do Concur — **62–37** (pass) · lower - be_concurred_in — **14–6** (pass) · lower - do_pass — **8–0** (pass) · upper - Do Pass — **44–6** (pass) · upper ## Sponsors - Willis Curdy — primary (person) ## Timeline The legislative action history — every referral, reading, and vote. - **2024-12-14T18:09:30+00:00** (LC) Drafter Assigned - **2025-01-20T23:19:04+00:00** (LC) Draft On Hold - **2025-01-21T21:14:34+00:00** (LC) Draft Taken Off Hold - **2025-02-14T23:07:37+00:00** (LC) Draft in Legal Review - **2025-02-15T17:47:03+00:00** (LC) Draft in Edit - **2025-02-18T18:09:22+00:00** (LC) Draft in Input/Proofing - **2025-02-18T21:50:25+00:00** (LC) Draft in Final Drafter Review - **2025-02-18T23:40:07+00:00** (LC) Draft in Assembly - **2025-02-19T00:20:58+00:00** (LC) Draft Ready for Delivery - **2025-02-25T21:32:00+00:00** (LC) Draft Delivered to Requester - **2025-02-25T22:48:47+00:00** (S) Introduced - **2025-02-26T20:27:22+00:00** (S) First Reading `reading-1` - **2025-02-26T20:32:00+00:00** (S) Referred to Committee - (S) Highways and Transportation `referral-committee` - **2025-03-03T20:17:59+00:00** (S) Hearing - (S) Highways and Transportation - **2025-03-03T23:12:45+00:00** (S) Committee Executive Action--Bill Passed - (S) Highways and Transportation `committee-passage` - **2025-03-04T20:06:00+00:00** (S) Committee Report--Bill Passed - (S) Highways and Transportation `committee-passage` - **2025-03-06T15:30:00+00:00** (S) Scheduled for 2nd Reading `reading-2` - **2025-03-06T18:53:00+00:00** (S) 2nd Reading Passed `reading-2, reading-2` - **2025-03-07T00:30:00+00:00** (S) Scheduled for 3rd Reading `reading-3` - **2025-03-07T02:04:00+00:00** (S) 3rd Reading Passed `passage, reading-3` - **2025-03-07T16:19:09+00:00** (S) Transmitted to House - **2025-03-17T15:27:01+00:00** (H) Referred to Committee - (H) Judiciary `referral-committee` - **2025-03-17T19:15:00+00:00** (H) First Reading `reading-1` - **2025-04-07T20:44:10+00:00** (H) Hearing - (H) Judiciary - **2025-04-09T19:04:35+00:00** (H) Committee Executive Action--Bill Concurred - (H) Judiciary - **2025-04-09T22:07:00+00:00** (H) Committee Report--Bill Concurred - (H) Judiciary - **2025-04-11T14:30:00+00:00** (H) Scheduled for 2nd Reading `reading-2` - **2025-04-11T19:19:00+00:00** (H) 2nd Reading Concurred `reading-2, reading-2` - **2025-04-11T21:01:00+00:00** (H) Scheduled for 3rd Reading `reading-3` - **2025-04-12T00:00:00+00:00** (H) 3rd Reading Concurred `passage, reading-3` - **2025-04-12T00:00:57+00:00** (S) Sent to Enrolling - **2025-04-14T13:36:33+00:00** (S) Returned from Enrolling - **2025-04-21T22:00:17+00:00** (S) Signed by President `passage` - **2025-04-25T20:40:10+00:00** (H) Signed by Speaker `passage` - **2025-04-25T21:18:10+00:00** (S) Transmitted to Governor `executive-receipt` - **2025-05-05T19:18:00+00:00** (S) Signed by Governor `executive-signature` - **2025-05-08T14:26:15+00:00** Chapter Number Assigned `became-law` ## Source OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/56b9283d-5a8c-4744-884b-6726c048a16c`. Confidence: reported (aggregated from official Montana legislature records).