An ignition interlock device is a breath-testing system wired to a vehicle’s ignition that requires drivers to provide a breath sample before the engine will start. The IID records breath alcohol concentrations and may require periodic retests while the vehicle is in use. Courts or the Mississippi Department of Public Safety may order an IID following a DUI conviction or as a condition of conditional reinstatement. Knowing how the device functions helps drivers understand reporting requirements and possible consequences for noncompliance. When an IID is required, it aims to prevent impaired driving while allowing limited driving privileges under monitored conditions. The device stores event logs and calibration data that can be reviewed by courts or administrative agencies. For residents of Metcalfe, understanding the timeline and vendor requirements is important to comply with orders and to gather documentation that may be needed for hearings or petitions to modify the terms of use.