What is an Ignition Interlock and How Does It Work?
An ignition interlock is a great-testing device which is installed directly into the wiring of a vehicle. The law provides for the mandatory installation of an interlock on a second DWI conviction, and optional installation on a first. The interlock works by eliciting a breath sample before the vehicle is started, five minutes after it is started (rolling retest), and at 30 minute intervals while the vehicle is being driven. If the driver takes and passes each breath test, the vehicle functions as normal.
