Effects of administrative ignition interlock license restrictions on drivers with multiple alcohol offenses |
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Authors: | William J Rauch Eileen M Ahlin Paul L Zador Jan M Howard G Doug Duncan |
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Institution: | (1) Westat, 1600 Research Boulevard, Rockville, MD 20850, USA;; |
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Abstract: | This study investigated, under real-world conditions, whether a statewide 2-year administrative ignition interlock license
restriction program in Maryland was effective in reducing subsequent alcohol-related traffic violations among multiple offenders
and whether any reductions in recidivism could be maintained after the program ended and interlock license restrictions were
removed. A total of 1,927 drivers eligible for relicensure were randomly assigned to either the 2-year interlock license restriction
program or the normal and customary sanctions afforded multiple offenders in Maryland. Recidivism was defined as incurring
a subsequent alcohol-impaired driving violation during the 2-year intervention or 2-year postintervention periods. Compared
to the control group, participation in the interlock license restriction program reduced drivers’ hazard (or risk) of a subsequent
alcohol-impaired driving offense by a statistically significant 36% during the 2-year intervention, 26% during the 2-year
postintervention period, and 32% during the entire 4-year study period. This investigation of interlock program effectiveness
is the first to report significantly lower recidivism among the interlock group than its control group after the ignition
interlock license restriction program ended. Possible reasons for this novel finding and areas for future research are discussed. |
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