Featured Research

from universities, journals, and other organizations

Ignition Locks Reduce DWIs

Date:
February 18, 2008
Source:
Substance Abuse Policy Research Program
Summary:
Interlocks, breath-testing devices that prevent a vehicle's ignition from starting if the driver is above a preset blood alcohol limit, can dramatically reduce driving-while-impaired offenses among first-time offenders, a new study shows.

Interlocks, breath-testing devices that prevent a vehicle's ignition from starting if the driver is above a preset blood alcohol limit, can dramatically reduce driving-while-impaired (DWIs) offenses among first-time offenders, a new study shows.

Related Articles


The findings help settle a dispute over whether interlocks work as well with first-time offenders as with repeat offenders, providing key new evidence that could influence the decisions of lawmakers and judges on how to keep drunk drivers off the road. Four states now mandate interlocks for first DWI offenses: New Mexico, Louisiana, Arizona and Illinois (effective in 2009).

Researchers compared two groups of first time DWI offenders in New Mexico: those who had installed interlocks as part of their sentence, and those who had not.

"We found that first-time offenders who had interlock devices were 60 percent less likely to have a repeat offense than those who did not use interlock devices," said Paul Marques, PhD, with the Pacific Institute for Research and Evaluation "This study on first-time offenders reinforces prior studies on this issue that show a 65 percent reduction in drunk driving while interlocks are installed."

This study examined the records of 1,461 first time DWI offenders who had interlocks installed in their vehicles, and compared them to 17,562 first offenders who didn't use the devices. The two groups were matched up by age, gender, and blood alcohol concentration (BAC) at the time of arrest.

Two other earlier studies questioned whether interlocks changed the behavior of first-time DWI offenders. But researchers in the New Mexico study noted that in the earlier studies: only a small proportion of those required to install the interlocks actually did so. The New Mexico study included only drivers who installed the devices.

"The idea that there should be any important difference between the risk posed by a first offender and a repeat offender is unsupported," Marques says. "The average first offender has driven drunk many times before he or she was arrested. The big risk difference is between non-offenders and first offenders. The risk difference between first offenders and repeat offenders is small by comparison."

The authors also found an economic benefit to vehicle interlocks. One device costs the offender $2.25 per day, a small price for the public compared to the damage and destruction caused by DWI crashes. The study estimated that for every dollar spent on interlocks for first offenders, the public saves $3. Only about 10 percent of arrested DWIs nationally are ordered a period of interlock-controlled driving, says Marques.

"For so many years we've managed DWIs as criminals, but this is more then just a crime issue since many DWI offenders are alcohol dependent. Interlocks present an opportunity to help change behavior rather than simply punishing or incarcerating the offender," Marques says. "It's not enough to revoke a license - 75 percent of all people with revoked licenses drive anyway - but you don't want to sentence an entire family to poverty if they're dependent on that driver getting to and from his or her job. By installing an interlock, the risk that the DWI offender poses is controlled, and interlocks become a public benefit."

New Mexico has been using interlocks for about a decade. The state recently enacted a law that mandates use of interlocks for all DWI offenders.

This research was recently published in the journal Traffic Injury Prevention. It was funded in part by the Substance Abuse Policy Research Program (SAPRP) of the Robert Wood Johnson Foundation. Other funding agencies for this study include the National Highway Traffic Safety Administration and the National Institute on Alcohol Abuse and Alcoholism. Co-authors include Dr. Robert Voas of the Pacific Institute and Dr. Richard Roth of Impact DWI in New Mexico.


Story Source:

The above story is based on materials provided by Substance Abuse Policy Research Program. Note: Materials may be edited for content and length.


Cite This Page:

Substance Abuse Policy Research Program. "Ignition Locks Reduce DWIs." ScienceDaily. ScienceDaily, 18 February 2008. <www.sciencedaily.com/releases/2008/02/080211102444.htm>.
Substance Abuse Policy Research Program. (2008, February 18). Ignition Locks Reduce DWIs. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2008/02/080211102444.htm
Substance Abuse Policy Research Program. "Ignition Locks Reduce DWIs." ScienceDaily. www.sciencedaily.com/releases/2008/02/080211102444.htm (accessed October 30, 2014).

Share This



More Matter & Energy News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Reuters - Innovations Video Online (Oct. 29, 2014) A Swedish amputee who became the first person to ever receive a brain controlled prosthetic arm is able to manipulate and handle delicate objects with an unprecedented level of dexterity. The device is connected directly to his bone, nerves and muscles, giving him the ability to control it with his thoughts. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Robots Get Funky on the Dance Floor

Robots Get Funky on the Dance Floor

AP (Oct. 29, 2014) Dancing, spinning and fighting robots are showing off their agility at "Robocomp" in Krakow. (Oct. 29) Video provided by AP
Powered by NewsLook.com
Saharan Solar Project to Power Europe

Saharan Solar Project to Power Europe

Reuters - Business Video Online (Oct. 29, 2014) A solar energy project in the Tunisian Sahara aims to generate enough clean energy by 2018 to power two million European homes. Matt Stock reports. Video provided by Reuters
Powered by NewsLook.com
Lowe's Testing Robot Sales Assistants in California Store

Lowe's Testing Robot Sales Assistants in California Store

Buzz60 (Oct. 29, 2014) Lowe’s is testing out what it’s describing as a robotic shopping assistant in one of its Orchard Supply Hardware Stores in California. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile: iPhone Android Web
    Follow: Facebook Twitter Google+
    Subscribe: RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins