The head of the State's medical bureau, which tests for drink driving, has called for changes in the law to allow the courts to direct repeat offenders to install breathalysers in their cars. The small breath-testing machines, known as ignition interlock devices, prevent motorists starting their vehicles if they are over the limit for alcohol consumption.

Professor Dennis Cusack, Director of the Medical Bureau of Road Safety, has described the devices as a "game-changer", saying alcohol is a contributory factor in about 30% of all road traffic crashes....