Close this search box.

New TIRF Report: Behavioral Patterns of Interlocked Offenders: Phase II

The Traffic Injury Research Foundation (TIRF) is pleased to release its latest report on alcohol interlocks entitled “Behavioral Patterns of Interlocked Offenders: Phase II.” The report is a follow up to a previous TIRF study, “Understanding Behavioural Patterns of Interlocked Offenders to Inform the Efficient and Effective Implementation of Interlock Programs” (Vanlaar et al. 2010).

The purpose of this new study was to further investigate the behavioural patterns of offenders using interlock data organized by jurisdiction and sex of offenders for a number of different violation types (e.g., attempt to skip a running retest). This quantitative study was conducted using interlock data compiled from Texas, California and Florida for the period between 1999 and 2012 and was provided by LifeSafer.

One of the primary objectives of the study was to enable administrators and practitioners to effectively utilize knowledge about behavioural patterns of interlocked offenders to create reasonable, realistic and achievable expectations regarding program features and offender performance.

The results from this current study corroborate the findings from previous research and demonstrate that many offenders on an interlock are not compliant at the beginning of their program participation, however the majority of them quickly become more compliant. Findings also suggest that monitoring can have an important impact on compliance.

Funding for this initiative was graciously provided by LifeSafer. Additional funding for this project was provided through a team grant awarded to Dr. Thomas G. Brown, Dr. Marie Claude Ouimet and Dr. Louise Nadeau from the Canadian Institutes of Health Research (CIHR).

About LifeSafer

LifeSafer is an independently operated subsidiary of LMG Holding Inc., the leading and largest provider of ignition interlock devices in the world. For more than 20 years, LifeSafer has been providing interlock devices and services to consumers and businesses. For more information about LifeSafer, visit

About Canadian Institutes of Health Research (CIHR)

Created in 2000 under the authority of the CIHR Act, the Canadian Institutes of Health Research (CIHR) is the Government of Canada’s health research investment agency. CIHR’s mandate is to “excel, according to internationally accepted standards of scientific excellence, in the creation of new knowledge and its translation into improved health for Canadians, more effective health services and products and a strengthened Canadian health care system.” For more information about CIHR, visit

Hard copies are available upon request. Please note minimum shipping and handling fees may apply.


For more information, please contact:


David Bird
Website administrator for

Explore More Road Safety Insights

TIRF’s research & educational tools support the work of communities across Canada.

Your donations & our work enable them to spend less time looking for answers & more time developing & implementing road safety strategies.