An ignition interlock device is like a modified breathalyzer that activates your car ignition. It is meant to monitor your BAC levels every time you drive and prevent you from driving if you fail the test. Your BAC level needs to be below 0.02 percent to start the car.
Just like a standard breathalyzer, you’ll have to blow into the device’s mouthpiece. It will automatically detect your BAC levels and start the car if they are below this limit.