Utilization of Interlock Data: Is it Used for Offender Monitoring and Programming

Ignition interlocks provide important data for monitoring offenders. If an offender has many failed starts, if their failed starts occur in a certain pattern or time of day, or if the offender has high blood alcohol content (BAC) measures, this information can be used by probation officers and the courts in their work with offenders and possibly adjust an offender's sanctions. This type of data can also be used by treatment providers in their work with offenders, helping them to better tailor treatment protocols to the offender's specific needs. The National Highway Traffic Safety Administration (NHTSA) is interested in learning more about how this ignition interlock data is being used in current interlock programs, identifying jurisdictions that utilize this data for offender monitoring and other programs, such as screening, assessment and treatment for alcohol problems, and determining if this data can be used effectively to reduce alcohol-impaired driving recidivism. This project explores the issues surrounding interlock data usage. The project will identify jurisdictions within States with first-offender interlock laws or high levels of interlock use that use interlock data for offender monitoring and other offender programs, such as screening, assessment, and treatment programs, gather information on how the data is used and by whom, and identify and catalog available data, contacts, and proprietorship for any data that may be used to evaluate the effectiveness of using interlock data to reduce recidivism. This is an exploratory study. No actual evaluation of data use and recidivism is included in this project.

  • Supplemental Notes:
    • See DOT HS 812 445 (August 2017) and DOT HS 812 428 (June 2017).


  • English


  • Status: Completed
  • Funding: $213,268
  • Contract Numbers:


  • Sponsor Organizations:

    National Highway Traffic Safety Administration

    1200 New Jersey Avenue, SE
    Washington, D.C.  United States  20590
  • Project Managers:

    Atkins, Randolph

  • Performing Organizations:

    Pacific Institute for Research and Evaluation

    11720 Beltsville Drive, Ste 900
    Calverton, MD  United States  20705-3111
  • Start Date: 20100816
  • Expected Completion Date: 0
  • Actual Completion Date: 20170831
  • USDOT Program: Behavioral Safety Research
  • Subprogram: Alcohol Impaired Driving

Subject/Index Terms

Filing Info

  • Accession Number: 01490056
  • Record Type: Research project
  • Source Agency: National Highway Traffic Safety Administration
  • Contract Numbers: DTNH22-10-R-00319
  • Files: RiP
  • Created Date: Aug 17 2013 1:01AM