Vehicle alcohol interlock systems appear to provide a useful technology for reducing the recidivism of suspended driving-while-intoxicated (DWI) offenders. These devices prevent the starting of the vehicle if the driver has a blood alcohol concentration (BAC) of .03 or higher. An extensive set of studies has demonstrated that interlocks are approximately 65% effective in reducing recidivism when installed on the vehicle of otherwise fully suspended DWI offenders. However, when given the option to install the interlock during a period when they would otherwise be fully suspended, only about 1 in 10 DWI offenders takes advantage of the opportunity to drive legally with the interlock. To increase offender motivation to install an interlock, some states are making it a requirement for reinstatement of the driver's license so that failure to install becomes a permanent barrier to driving legally. This application requests funds to extend a preliminary study of more than 82,000 DWI offenders who were convicted after the new law went into effect and sentenced to the Florida interlock program, which was among the first to adopt this procedure. Our preliminary study has indicated that making the interlock a prerequisite to reinstatement appears to increase the participation rate but delays implementation of the program. The study proposed in this R21 application will collect pre-law data in Florida to determine whether relative to the absence of such a law, requiring an interlock for reinstatement delays the reinstatement of all DWI offenders, users and nonusers, and whether it reduces overall statewide DWI recidivism.

Public Health Relevance

Typically offered as an option for driving during part of the license suspension period, alcohol ignition interlocks have been shown to reduce the risk to the public of injury in a highway crash by substantially reducing the frequency of impaired driving by DWI offenders. This study will determine whether a new approach to interlocks-requiring DWI offenders to install them as a condition of driver's license reinstatement enhances the public health benefits of interlocks by increasing the number of offenders who install them and producing greater reductions in recidivism.

Agency
National Institute of Health (NIH)
Institute
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21AA018732-02
Application #
8068246
Study Section
Health Services Research Review Subcommittee (AA)
Program Officer
Bloss, Gregory
Project Start
2010-05-01
Project End
2014-01-31
Budget Start
2011-05-01
Budget End
2014-01-31
Support Year
2
Fiscal Year
2011
Total Cost
$226,479
Indirect Cost
Name
Pacific Institute for Research and Evaluation
Department
Type
DUNS #
021883350
City
Beltsville
State
MD
Country
United States
Zip Code
20705
Voas, Robert B; Taylor, Eileen; Kelley-Baker, Tara (2014) How necessary is monitoring to interlock program success? Traffic Inj Prev 15:666-72
Voas, Robert B (2014) Enhancing the Use of Vehicle Alcohol Interlocks With Emerging Technology. Alcohol Res 36:81-9
Voas, Robert B; Tippetts, Anthony S; Grosz, Milton (2013) Administrative reinstatement interlock programs: Florida, a 10-year study. Alcohol Clin Exp Res 37:1243-51