SecondChanceInfo

Ignition Interlock Device (IID) in Missouri

Missouri uses the term "DWI" for impaired driving offenses. IID requirement: required for high bac or repeat offenses. First offense scope: 90 days (if high BAC; not required for standard first offense). Confirm your actual notice and license status.

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Required for high BAC or repeat offenses

Quick Answer

Missouri requires IID for DWI offenders who wish to obtain a restricted driving privilege (RDP) during their suspension. IID is mandatory for second and subsequent offenders seeking any driving privileges. First offenders may get an RDP without IID if BAC was below 0.15%.

IID Duration by Offense

OffenseIID Duration
1st Offense90 days (if high BAC; not required for standard first offense)
2nd Offense6 months (as part of restricted driving privilege)
3rd Offense1 year
4th+ Offense1 year (longer possible by court order)

BAC threshold: 0.15% BAC for first offense RDP with IID; all repeat offenses

Confirm the device, provider and written quote

Check the responsible authority’s current approval information for the particular device and installer. Request the billing unit, included services, actual paid visit schedule, taxes, fees and removal terms in writing. Confirm financial assistance separately.

Add your own quoted charges in the IID worksheet. Unknown charges stay unknown; no local price or appointment count is assumed.

Restricted License with IID

Available

Missouri issues a Restricted Driving Privilege (RDP) with IID for essential driving purposes.

Tampering / Circumvention Penalties

Tampering with an IID in Missouri is a Class A misdemeanor carrying up to 1 year in jail.

Early Removal

Missouri does not allow early removal.

Missouri-Specific Notes

Missouri's IID requirements depend on offense number and BAC level. Standard first-offense DWI does not require IID for a restricted driving privilege, but high BAC (0.15%+) does.

Frequently Asked Questions

Is an IID required for a first DWI in Missouri?
Not for standard first-offense DWI. If your BAC was 0.15% or higher, IID may be required for restricted driving privileges.
How long do I need an IID in Missouri?
First offense (if applicable): 90 days. Second: 6 months. Third or more: 1 year.
How much does an IID cost in Missouri?
Get a written quote for your vehicle and program. Confirm the billing period, included service, separately paid visits, taxes, state/program fees and removal charges. Verify any financial assistance before assuming a discount. A generic state price range is not your quote.

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Disclaimer: This is informational only, not legal advice. IID requirements, costs, and approved providers change frequently. Verify current requirements with the Missouri DMV, your IID provider, or a qualified DUI attorney in Missouri.
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Sources

NHTSA: interlock device and program background. This national reference does not verify every state rule above. Confirm the applicable law and current instructions with the authority named on your order or licensing notice.