An ignition interlock device is an in-vehicle breath testing device that prevents a vehicle from starting if alcohol is detected above a preset threshold. In Mississippi, devices may be required by court order or as part of administrative license actions following impaired driving incidents. Requirements vary based on the circumstances and prior record, and the device typically records initial start tests, rolling retests while driving, and other events that vendors report to monitoring authorities. If you are told you must use a device, you should understand the timelines, vendor options, and reporting obligations. For Yazoo City residents, timely enrollment and adherence to calibration schedules are important to avoid additional administrative penalties. Keeping documentation of installation and maintenance also helps demonstrate compliance when needed in hearings or license reviews.