Missouri Ignition Interlock Requirements (2026): Costs & Approved Providers
Missouri’s ignition interlock system gives first-time DWI drivers a meaningful choice: install an IID immediately and drive from day one, or wait out a 30-day hard suspension first. For repeat offenders, the IID — now required to include a camera — is mandatory at reinstatement. Here’s how both paths work, which three providers are MoDOT-certified, and what violations cost you.
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Missouri DWI interlock requirements at a glance
| Offense term | DWI (Driving While Intoxicated) — Missouri’s term for impaired driving |
| All-offender mandate? | No — first offenders choose between IID (drive immediately) or 30-day hard suspension; IID is mandatory for reinstatement when record shows more than one alcohol/drug contact |
| 1st DWI / BAC — Option A (IID) | Install IID → immediate 90-day Restricted Driving Privilege (RDP). Drive from day one during the 90-day suspension. |
| 1st DWI / BAC — Option B (no IID) | 30 days hard suspension (no driving) → 60-day RDP without IID. Total 90 days either way. |
| Reinstatement IID (1st alcohol contact) | No IID required at reinstatement for a single alcohol/drug contact unless court-ordered |
| Reinstatement IID (2+ alcohol contacts) | Camera-equipped IID for not less than 6 months at reinstatement (RSMo 302.304; 302.309) |
| 2nd DWI (within 5 years) | 5-year license denial (302.060); camera-equipped IID for not less than 6 months from reinstatement |
| 3rd+ DWI | 10-year license denial; circuit court petition after 10 years; camera-equipped IID not less than 6 months from reinstatement |
| Camera requirement | Missouri requires camera-equipped IID for all repeat-offender reinstatement cases (7 CSR 60-2) |
| Violation — 90-day RDP period | +30 days added per violation |
| Violation — reinstatement IID period (final 3 months) | Term extends until 3 consecutive violation-free months are completed |
| Missed maintenance | Terminates the LDP/RDP or re-suspends driving privileges |
| DOR fees | $45 reinstatement fee (alcohol/drug offense); $20 if re-suspended for IID non-maintenance |
| No indigent IID program | No state-funded IID cost assistance found on dor.mo.gov or modot.org |
| Who certifies devices | Missouri DOT (MoDOT) — 7 CSR 60-2; DOR administers LDP/RDP and removal authorization |
| Governing law | RSMo 302.304; 302.060; 302.309; 577.010; 7 CSR 60-2 |
The first-offense choice: IID immediately or 30-day wait
Missouri gives first-time DWI drivers (and first-offense BAC cases) a clear trade-off on their 90-day suspension period:
- Option A — IID from day one: Install a MoDOT-certified IID immediately → DOR issues a 90-day Restricted Driving Privilege. You drive from the first day of your suspension period, with no hard suspension at all.
- Option B — No IID: Serve 30 days of hard suspension (no driving), then receive a 60-day RDP without a device. You can’t drive for a month but don’t have device costs.
For anyone who needs to commute to work, take children to school, or fulfill any regular obligation, Option A is almost always the better choice. The device costs less than a month of lost wages for most workers.
Repeat offenders: camera-equipped IID required. Missouri doesn’t just require an IID for repeat DWI offenders — it requires a camera-equipped IID (7 CSR 60-2). The camera records the driver at startup and rolling retests. Not all provider models meet this requirement. When contacting a provider as a repeat offender, specifically confirm that their Missouri-certified device includes a camera before booking.
No state indigent IID program in Missouri. We found no state-funded IID cost-assistance program on dor.mo.gov or modot.org. SATOP (the Substance Awareness Traffic Offender Program) has a sliding-scale fee for its own services — but that does not cover IID costs. All IID installation and monitoring costs are paid out of pocket. Ask providers about payment plans if cost is a barrier.
Missouri MoDOT-certified providers
Three major national providers are on Missouri’s MoDOT-certified list. Guardian, Dräger/RoadGuard, and ALCOLOCK are not certified in Missouri.
| Provider | Monthly est. | Coverage | |
|---|---|---|---|
| Intoxalock | $60–100 | Statewide | 888-283-5899 |
| Smart Start | $70–100 | Statewide | 800-831-3299 |
| LifeSafer | $65–95 | Statewide | 800-634-3077 |
Confirm current MoDOT certification at dor.mo.gov before signing. Guardian, Dräger/RoadGuard, and ALCOLOCK are not on Missouri’s certified list. Repeat offenders: confirm that the specific device model includes a camera before booking — Missouri requires camera-equipped IID for all reinstatement cases.
What an interlock costs in Missouri
| Installation (one time) | $70–150 |
| Monthly lease + monitoring | $60–100 |
| Removal | $50–75 |
| DOR reinstatement fee (alcohol/drug offense) | $45 |
| DOR re-suspension fee (IID non-maintenance) | $20 |
| SATOP assessment | $375 ($126 + $249 supplemental) |
Over a 90-day first-offense RDP term, expect roughly $450–700 in device costs before DOR fees (no indigent assistance available). Estimate your exact cost →
How to get installed — 5 steps
- After your DWI suspension notice, decide between Option A (IID immediately, drive throughout) and Option B (30-day hard suspension, then 60-day RDP without IID). For most working drivers, Option A is the better choice.
- If choosing Option A: contact a MoDOT-certified provider immediately and arrange installation. Repeat offenders: specifically confirm the device includes a camera before booking.
- Bring your suspension paperwork and vehicle. Installation takes 60–90 minutes. DOR will issue your RDP once they confirm the IID installation.
- Keep every monthly maintenance appointment — missing maintenance terminates your LDP/RDP. Keep a clean record, especially in the final 3 months of any reinstatement IID period.
- At term end: do not remove until DOR confirms eligibility. Your manufacturer notifies DOR electronically on completion. Pay the $45 reinstatement fee and complete SATOP if required.
Don’t sit out 30 days. Install an IID and drive from day one — call to book now.
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Violations and the 3-month clean window
Missouri handles violations differently depending on where you are in your IID period:
- During the 90-day first-offense RDP: Each violation adds 30 days to the RDP term.
- During the final 3 months of a reinstatement IID period: Any violation extends the term until 3 consecutive violation-free months are completed — the 3-month window restarts from zero.
- Missing monthly maintenance: Terminates your LDP/RDP or re-suspends your driving privileges outright — a $20 DOR re-suspension fee applies.
The 3-month clean-window mechanic for reinstatement IID cases means a violation near the very end of your term doesn’t just add days — it resets the entire 3-month clock. Keep especially clean compliance in the home stretch.
Missouri requires SR-22 insurance for 2 years — shorter than most states, and the clock starts at the suspension start date. See Missouri SR-22 costs and cheapest carriers →
Missouri DWI interlock FAQ
Can I drive from day one after a DWI in Missouri?
Yes — if you install a MoDOT-certified IID immediately. Missouri gives first-time DWI drivers a choice: install an IID and receive an immediate 90-day RDP (drive from day one), or serve 30 days of hard suspension followed by a 60-day RDP without a device. For most drivers with work and family obligations, the IID path is clearly better.
Do repeat offenders need a camera on the interlock in Missouri?
Yes — Missouri requires camera-equipped IID for all repeat-offender reinstatement cases under 7 CSR 60-2. The camera records the driver at startup and rolling retests. Before booking installation as a repeat offender, specifically confirm that the provider’s Missouri-certified device model includes a camera.
How long is the IID requirement for repeat offenders?
Not less than 6 months of camera-equipped IID from the date of reinstatement, regardless of whether it’s a second or third conviction. The license denial periods are long (5 years for a second conviction within 5 years; 10 years for a third+) — the 6-month minimum starts only after DOR reinstates your license following that denial period.
Is there financial assistance for low-income drivers in Missouri?
No state IID cost-assistance program was found on dor.mo.gov or modot.org. SATOP has a sliding-scale fee for its own substance-awareness program — but that does not cover IID installation or monitoring costs. All IID costs are out of pocket. Ask providers about payment plans.
What happens if I miss a maintenance appointment in Missouri?
Missing your monthly maintenance appointment terminates your Limited Driving Privilege or re-suspends your driving privileges. DOR charges a $20 re-suspension fee. This is separate from the violation consequences for failed tests — missing service is treated as a compliance failure that can end your driving privileges immediately.
Sources:
Missouri DOR — IID FAQ;
RSMo 302.304; 302.060; 302.309; 577.010; 7 CSR 60-2.
Last verified August 2026.
Advertising disclosure: We may be compensated when you contact a provider through our numbers or links. This doesn’t affect our rankings or information. Content is informational only — not legal advice. Verify MoDOT certification and camera requirement before installation.