Abstract
While drunken driving arrest rates have plummeted since the 1980s, repeat drunken driving offenders remain a serious and often deadly problem. One intervention which has demonstrated promise in reducing repeat Driving While Intoxicated (DWI) offences is the ignition interlock. The ignition interlock is a breath-alcohol testing device attached to the ignition system of a motor vehicle which prevents the vehicle from starting if the driver produces a breath sample which exceeds a pre-determined alcohol level. The ignition interlock device also collects data as to the number of attempted starts, breath-alcohol levels from the starts, retests and violations resulting in the vehicle being ‘locked out’ and unavailable for use. This paper examines the data reports collected on a sample of interlock users who were court-ordered to install the device as a result of a DWI conviction in the state of Arkansas. Almost half of the subjects experienced one or more violations with a breath alcohol level that exceeded the 0.08 g/dl legal limit. More than 20 per cent had violations at the very high level of 0.15 g/dl. These data suggest that the ignition interlock may be very effective in preventing DWI recidivism among the problem ‘hard-core’ drunk driver.
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