Abstract
Researchers have assessed the effect of longer prison sentences by conducting aggregate-level studies of general deterrence. However, relatively little attention has been paid to the specific deterrent effects of longer custody sentences on individual offenders. The authors evaluated the effect of sentence length on drunk driving recidivism by using official records in a retrospective research design. A sample of 514 incarcerated drunk drivers we are followed up for 24 to 45 months in Alberta, Canada. The study searched for possible sentencing thresholds, the optimum sentence length at which point deterrent effects are maximized, and used multivariate statistical analysis to control for possible confounding background variables. The authors observed that sentence length exerted consistent deterrent effects on repeat drunk driving, even for chronic offenders. Shorter sentences were less effective in discouraging drunk driving recidivism, while sentences longer than 6 months did not produce additional benefits.
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