CDC Study Shows that Ignition Interlocks Reduce DWI

Ignition interlock device allows DWI offenders to drive

CDC researchers have concluded that ignition interlocks are working to help prevent drivers from being re-arrested for DWI. Their findings, published in the March issue of the American Journal of Preventive Medicine, showed a 67 percent reduction in re-arrest for DWI compared to individuals who did not have the device installed.

 The CDC based their findings on a review of 15 individual studies on the interlocks.  The interlocks are installed on vehicles of individuals convicted of a DWI as an alternative to having their license suspended. This option allows the drivers to use their vehicles once the device confirms, by breath analysis, that their blood alcohol concentration is not greater than 0.02 to 0.04 grams per deciliter (g/dL).

“When offenders’ licenses are suspended, they aren’t legally able to provide transportation for themselves and others who may rely on them to get to places like school and work,” said Randy Elder, Ph.D., scientific director of systematic reviews with the Community Guide branch and lead author on the review. “Ignition interlocks allow offenders to keep operating their vehicles legally. At the same time, they effectively ensure that they do so more safely—not under the dangerous effects of alcohol.”

After reviewing all of the data from the various studies, the CDC has concluded that the ignition interlock devices have been a success. The agency recommends that the devices be put into widespread use, and that they should be issued every DWI conviction including first time offenders.