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 duration: 90 days (if high BAC; not required for standard first offense). Monthly cost: $60-$95.
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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
| Offense | IID Duration |
|---|---|
| 1st Offense | 90 days (if high BAC; not required for standard first offense) |
| 2nd Offense | 6 months (as part of restricted driving privilege) |
| 3rd Offense | 1 year |
| 4th+ Offense | 1 year (longer possible by court order) |
BAC threshold: 0.15% BAC for first offense RDP with IID; all repeat offenses
IID Cost Breakdown in Missouri
| Item | Cost | Notes |
|---|---|---|
| Installation | $70-$150 | One-time fee. Takes about 1 hour. |
| Monthly Lease + Monitoring | $60-$95/mo | Includes device lease and monitoring. |
| Calibration | $25-$65 | Every 60 days. |
| Removal | $50-$100 | One-time fee when IID period ends. |
| Estimated Total (6 months) | $480-$820 | Install + 6 months lease + removal. |
| Estimated Total (12 months) | $840-$1,390 | Install + 12 months lease + removal. |
One-time
Lease + monitoring
Every 60 days
One-time
All-in estimate
All-in estimate
Approved IID Providers in Missouri
Contact providers directly for current pricing and service center locations in Missouri. Compare at least 2-3 providers before choosing — prices and service quality vary.
Restricted License with IID
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?
How long do I need an IID in Missouri?
How much does an IID cost in Missouri?
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