From February 2015, all drivers convicted of a repeat or serious drink driving offence will receive an interlock order that requires them to participate in the Mandatory Alcohol Interlock Program (unless the court determines an exemption applies).
Interlocks are electronic breath testing devices linked to the ignition system of cars, motorcycles and heavy vehicles.
Drivers must provide a breath sample that the interlock analyses for the presence of alcohol before the vehicle will start. If a positive sample is detected, the vehicle will not start. Randomly timed breath tests must also be passed during a journey.
More information on the Mandatory Alcohol Interlock Program and the interlock exemption order is available on the Roads and Maritime Services website.