Research

stop DUI

State Alcohol Ignition Interlock Laws and Fatal Crashes
Insurance Institute for Highway Safety
March 2018

The IIHS research reported that in states with all-offender IID laws, 16% fewer drivers with a .08 or greater BAC were involved in fatal alcohol-involved crashes.

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Effects of Washington State’s Alcohol Ignition Interlock Laws on DUI Recidivism: An Update
Insurance Institute for Highway Safety
March 2018

IIHS first studied the effects of IID laws on drunk driving recidivism in 2013 and this 2018 report provides an update on the research. The study concludes that over the five-year period as the laws were improved, the number of ignition interlocks installed on driver’s vehicles increased, decreasing drunk driving recidivism of first-time offenders.

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2.3 Million Attempts to Drive Drunk Stopped By Ignition Interlocks
Mothers Against Drunk Driving
February 2018

Research by MADD shows that ignition interlock devices have stopped 2.3 million attempts by offenders to drive drunk with a BAC of .08 or greater in the United States through 2017.

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Ignition Interlock Laws: Effects on Fatal Motor Vehicle Crashes, 1982-2013
Emma E. McGinty, American Journal of Preventative Medicine
January 2017

This study looks at how ignition interlock laws can reduce fatal crashes and concludes that having mandatory interlock laws for all offenders would significantly benefit public health. The research concluded that all-offender laws for first-time offenders with a BAC of greater than .08 were associated with a seven percent decrease in fatal drunk driving crashes, and laws for first-time offenders with a BAC of greater than .15 were associated with an eight percent decrease in fatal drunk driving crashes. Furthermore, McGinty finds laws requiring interlocks for segments of high-risk drunk driving offenders may reduce alcohol-involved traffic fatalities after 2 years of implementation.

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Study of Four County Ignition Interlock Pilot Program
California DMV
June 2016

The study conducted by the California Department of Motor Vehicles in four counties (Alameda, Los Angeles, Sacramento, and Tulare) found that ignition interlock devices are 74% more effective in reducing drunk driving recidivism than license suspension for first time offenders.

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Impact of State Ignition Interlock Laws on Alcohol-Involved Crash Deaths in the United States
EJ Kaufman, University of Pennsylvania
March 2016

This study correlates the number of fatalities from drunk driving and the use of ignition interlocks. The study found that DUI deaths decreased by 15% in states that have all-offender interlock laws.

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Michigan DUI/Sobriety Court Ignition Interlock Evaluation
The Michigan Association of Treatment Court Professionals
2016

Key findings in the Michigan study found that people who were ordered to be on an interlock device had less recidivism over the course of a four-year period than offenders who were not on an interlock or were on standard probation.

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Locked and Not Loaded: First time Offenders and State Ignition Interlock Programs
Darin F. Ullman, International Review of Law and Economics 45
2016

Ullman’s research looks at vehicular fatality data across the United States and examines the effectiveness of mandatory interlock laws in reducing alcohol-related fatalities. He concludes mandatory all-offender laws can reduce alcohol-related traffic fatalities by nine percent and suggests his research provides evidence to policy makers as to why all offenders should participate in interlock programs.

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Safety Report Reaching Zero: Actions to Eliminate Alcohol-Impaired Driving
National Transportation Safety Board
2013

While the NTSB makes the point that license suspension or license revocation laws are effective in reducing alcohol-impaired motor vehicle crashes, the agency says that these laws can be strengthened by requiring first-time offenders to install ignition interlock devices as a condition of license reinstatement.

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Highway Special Investigation Report Wrong-Way Driving
National Transportation Safety Board
2012

The NTSB found that over the last two decades, ignition interlock devices were effective in reducing drunk driving recidivism. One study that assigned offenders randomly found that when assigned to an interlock or other control program, that there was a 36 percent reduction in recidivism after the interlock was removed.

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