Voas, Tippetts, and Grosz, Alcoholism Clinical Experimental Research, “Administrative Reinstatement Interlock Programs: Florida, A 10- Year Study.” • The lower section of Table 5 presents the annual recidivism rates of offenders while the interlock was on their vehicles and after it had been removed. In keeping with past research, the recidivism rate while on the interlock was approximately two-thirds lower than after the units were removed.
Table 5. Recidivism Rates of Offenders: While Revoked, During, and After the Interlock Period
Period 1 year 2 Years 3 years 4 years 5 years
% Recidivating
Number of Subjects
4.38% 4.90% 5.29% 6.00% 6.86%
91,520 60,709 42,464 29,282 18,600 36,063 19,581
Recidivism of all mandated to receive interlock during ‘hard’ suspension Recidivism while interlock was installed Recidivism after interlock was removed
6 months
.55%
1 year`
1.20%
1 year
3.55%
24,976
2 years
6.76%
18,095
Traffic Injury Prevention, Ferguson, “ Alcohol-Impaired Driving in the United States: Contributors to the Problem and Effective Countermeasures,” 2012. • The available scientific evidence clearly indicates that offenders with ignition interlocks on their vehicles are at a substantially lower risk of reoffending compared to offenders who have had their licenses suspended. • A review undertaken by the Cochrane Collaboration (Willis et al. 2004) reported that when these devices are used on the vehicles of convicted DWI offenders, they reduce recidivism by about two thirds (Willis et al. 2004). • These effects were similar for first time offenders and repeat offenders alike. • The additional studies examined by Elder et al. (2011) found similar effect sizes. Pooling the data from many of the studies, Elder (2011) estimated the median effect as a reduction of 67 percent (range −85 to −50%) in recidivism. Effect sizes were similar for first-time and repeat offenders. Roth, Presentation to NHTSA Region 5, “Comparison of Recidivism Rates for NM DWI Offenders Obtaining Ignition Interlock Driving Privileges and Offenders w ith ‘Hard’ License Suspensions,” Madison, WI, October 2012. • Recidivism per year of exposure by BAC group and conviction number for interlocked vs revoked offenders. (53,048 persons convicted of DWI in New Mexico, 2006-2011).
Centers for Disease Control and Prevention, 2011 • Re-arrest rates decreased by a median of 67 percent relative to comparison groups in a review of 15 studies
Marques, 2010 • Re-arrest rates decreased by 39 percent after the device is removed compared to offenders who never installed an interlock
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