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Missouri Department of Transportation

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Impaired driving contributes to more than

25 percent of all Missouri traffic fatalities

Photo of alcohol-related crashAn ignition interlock device is a  breath-testing device that is installed in a vehicle and is connected to the ignition, horn and headlights. To start the vehicle, a driver must blow into the device without registering a blood alcohol concentration (BAC).

Missouri law requires any person guilty of a second or subsequent intoxication-related traffic offense to install an ignition interlock device on any vehicle they operate before reinstating driving privileges.

Each ignition interlock provider is responsible for reporting ignition interlock compliance to the Department of Revenue and/or the court-ordered supervising authority.

To view the Administrative Rules which establish the standards for the Breath Alcohol Ignition Interlock Device Certification and Operational Requirements visit http://www.sos.mo.gov/adrules/csr/current/7csr/7csr.asp.

If you are required to have an ignition interlock device installed, call the manufacturers listed below to obtain information regarding installation, pricing and locations around the state. Make sure that the device you have installed is one of the approved devices listed below.

Name of Manufacturer
Approved Device
Customer Service Number
Consumer Safety Technology Intoxalock - Model 1001A
Smart Start SSI 20/20 and SSI 20/30
Lifesafer FC-100 (Not approved for use with camera and/or global positioning system)
Guardian Interlock AMS 2000
Draeger Interlock XT (not approved with GPS)
Alcohol Detection Systems Determinator 2


Additional Resources:

BAIID Tracking System

Frequently Asked Questions

Mothers Against Drunk Driving

Substance Abuse Traffic Offenders Program

Department of Revenue, Driver License Bureau

Traffic Injury Research Foundation

National Highway Traffic Safety Administration


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Missouri Department of Transportation
Central Office
105 W. Capitol Avenue
Jefferson City, MO 65102
1-888-ASK-MODOT (275-6636)
1-866-831-6277 (Motor Carrier Services)
Driver's License Offices
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