All 50 states and the District of Columbia have enacted zero tolerance (ZT) laws, making it illegal for people younger than 21 to drive with any measurable amount of alcohol in their bodies. Although ZT laws have been effective in reducing alcohol-related crashes among underage drivers, enforcement in some states has not been rigorous, and ZT offenses may not be viewed as serious offenses. On July 1, 1994, the state of Washington implemented a ZT law; enforcement is aided by the fact that police may request a test for alcohol on suspicion of either a ZT or driving under the influence DUI) offense. The current study examined the effect of the law on arrests and case dispositions among underage people and the patterns of recidivism among underage offenders after the ZT law took effect. Times series analyses examined the effects of the ZT law on trends in arrests of underage drivers between 1991 and 1999. Based on arrest records matched with driver license records, the effects of the law on dispositions of alcohol-related offenses among underage people were examined, and rates of recidivism among underage offenders were examined for the period following the ZT law. There was a substantial increase in arrests of underage drivers beginning immediately after implementation of the ZT law, especially among drivers with low blood alcohol concentrations (BACs). The types of court or administrative dispositions received by underage offenders changed markedly after the ZT law was implemented. Underage offenders with lower BACs became far more likely to receive alcohol-related convictions and/or license suspensions than nonalcohol-related convictions. However, the percentage of underage offenders with higher BACs receiving DUI convictions declined as some of these offenders received the lesser ZT disposition. Underage offenders with BACs of 0.10 percent or higher were more likely to recidivate than those with lower BACs, but appreciable proportions of drivers were re-arrested for another alcohol offense, whatever the BAC and however they were penalized. Implementation of Washington’s law indicates a ZT law can increase the likelihood that an underage person will be sanctioned for drinking and driving. However, recidivism remains an issue, as more than one in four underage drivers arrested with low BACs subsequently were re-arrested.
Samenvatting