How Do Ignition Interlock Devices Work?
Drivers in Tennessee convicted of a DUI-related offense, including driving with a blood alcohol content level of .08 or higher (.04 if the driver is a commercial driver), can be ordered to use an ignition interlock (IID) device for up to one year. A driver may also request to use an IID in order to obtain a restricted license for an offense that wouldn’t normally require an IID; this allows them to drive without geographic restrictions [...]