Ignition Interlock Laws in the State of Missouri

In the State of Missouri an ignition interlock device (IID) is required for all DWI-related convictions, including first-time offenses, as well as in cases of refusing to submit to a chemical test.  IIDs must be installed in all motor vehicles operated by the offender. The offender is responsible for any and all costs associated with the IID, including installation, leasing, purchasing, maintaining, monitoring and removal.

Missouri FlagThe IID is a small device that is connected to the vehicle’s ignition system, horn and headlights. The driver is required to blow into the device to submit a breath sample. The IID measures the alcohol content of the breath sample and compares it to a pre-set limit. If the breath sample indicates an alcohol level that is above a pre-set limit, the IID prevents the vehicle from starting. IIDs require drivers to submit random breath samples while operating vehicles. If a “rolling re-test” results in a breath alcohol content that is above the pre-set limit, the IID initiates an alarm sequence that includes sounding the vehicle’s horn and flashing the vehicle’s lights. The alarm sequence continues until the driver turns off the vehicle or submits a clean breath sample.

The offenders must have the IID serviced by a certified service provider every month. During the service appointments, the service provider inspects the IID for proper operation and evidence of tampering and circumvention. The service provider downloads the data from the IID, including results of the breath samples, and submits the data and findings to the Missouri Department of Revenue.

The IID is required for a minimum of six months and the time period begins when the offender’s driving privileges are reinstated after a suspension or revocation. To operate an IID-equipped vehicle, the offender must obtain a limited driving privilege (LDP) license. LDP licenses are not available to offenders with two or more convictions for refusing chemical tests, DWI convictions involving drugs or controlled substances or multiple convictions involving alcohol or narcotic drugs.

The offender must serve 30 days of the DWI-related suspension or revocation before obtaining the LDP license. In cases where driving privileges are revoked for refusing a chemical test, offenders must serve 90 days of the revocation.

As Missouri’s largest ignition interlock device provider, we will work with you to have your device installed within 48 hours.  We have many convenient locations throughout Missouri.  We will work with you to file all of the required legal paperwork.

Our Start Up Packing Includes the Following:

  • Complete Installation of the Ignition Interlock Device (IID)
  • 1 Month Unit Rental & Monitoring
  • Training On The Proper Use And Maintenance Of The IID
  • Notification to  the Missouri Department of Revenue that you are installed
  • Electrical System Check
  • 24/7/365 Customer Service
  • Low Monthly Rate
  • Optional Theft Protection

Additional Resources for the State of Missouri

General IID Information from Missouri’s Department of Revenue

Missouri Driver’s License Reinstatement Requirements