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Alcohol interlock programs (AIP) are aimed at preventing drunk-driving recidivism. They first appeared in Europe in the nineties.

The purpose of this study was investigate whether AIPs are effective in reducing recidivism and determine what factors of such programs contribute to their positive impact.

We performed a follow-up of AIP participants (n = 175) and control participants (n = 234) for five years. Data such as blood alcohol concentration (BAC) at time of arrest, previous and subsequent violations (alcohol-related or other types) were collected from the official driver's license files. For self-evaluation and evaluation of the program (since November 2009 only), we used questionnaires based on two theoretical models: the Transtheoretical Model of Change (Prochaska & DiClemente, 1984) and the Diamond of Change Model from the DRUID project, build to explain which are the …