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Ignition Interlock Devices in Missouri

Many times a person will be required to have an ignition interlock device on their vehicle during the period they are on probation.  An ignition interlock device is a breathalyzer device that connects onto a motor vehicle ignition system.  A driver must blow into the device and have the BAC level result read below .02 in order for the motor vehicle to start operation.  If the device registers a BAC above this amount, the vehicle will not turn on but an alarm will sound to help notify law enforcement that the person was attempting violate the ignition interlock device system.  Periodically while driving, the ignition interlock device may also require the drive to blow into the device in order to monitor the person’s alcohol levels.

A person who is required to have an ignition interlock device must provide proof of installation of the ignition interlock device in their motor vehicle and must also bear the burden of paying for the costs of installation and maintenance.  The person must also report to their probation officer reports on the operation of the device, and provide to the court periodic calibration checks that are needed for the proper operation of the ignition interlock device.


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