An ignition interlock device is a breath-testing unit installed in a vehicle that prevents engine start if the driver’s breath alcohol level exceeds a set threshold. The device requires a breath sample before starting and may require intermittent retests while the vehicle is running. It records test results and service events, and those logs are used by courts and the Department of Public Safety to verify compliance with interlock orders. For Tupelo drivers, installing an approved device often provides a route to limited driving privileges while meeting court or administrative conditions. Because the IID records start-up tests and random retests, keeping service and calibration records is important for demonstrating ongoing compliance. Providers document each maintenance visit and any failed tests, and that documentation is critical when filing for reinstatement or addressing disputes. Understanding how the device works and what records to keep helps drivers avoid administrative surprises and supports requests for conditional licenses or full reinstatement when the required period ends.