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Ignition Interlock Devices Combat DUI Offenses

A number of states across the country now require ignition interlocks for those convicted of Driving Under the Influence (DUI) offenses. These breathalyzer devices prohibit a vehicle from starting if the driver’s Blood Alcohol Concentration (BAC) reads above a set level. An article detailing the technology is available here. Earlier this year, California mandated ignition […]

Published on February 18, 2019
Last Updated: November 4, 2026
Woman with Breathalyzer

A number of states across the country now require ignition interlocks for those convicted of Driving Under the Influence (DUI) offenses. These breathalyzer devices prohibit a vehicle from starting if the driver’s Blood Alcohol Concentration (BAC) reads above a set level. An article detailing the technology is available here.

Earlier this year, California mandated ignition interlock devices for those convicted of multiple DUI offenses. Politicians, researchers, and safety advocates say laws mandating such devices can discourage drunk driving—lowering the number of alcohol-related deaths.

The Numbers

Even though deaths caused by drunk drivers have fallen to nearly half what they were in the early 1980s, they have risen in recent years. Mothers Against Drunk Driving (MADD) states ignition interlock devices have stopped those with a BAC above 0.08—the legal threshold nationwide. They suggest this has prevented some 2.3 million attempts by offenders to drive drunk between 2006 and 2016. Additional research indicates interlock devices have lowered the number of DUI deaths by between 7% and 15% overall.

The Laws by State

In addition to California, Georgia, Indiana, Massachusetts, Montana, and Ohio also require interlock devices for drivers with multiple DUIs on their record, even though advocates would prefer the new law target all DUI offenders. Interlock devices are required for first-time offenders in 32 other states and the District of Columbia. North Carolina requires ignition interlock devices for one year for first-time offenders with a BAC of 0.15 or more. For those with multiple DUI convictions, the state requires an interlock device for three to seven years.

We Can Help.

If you or someone you love has been injured in a motor vehicle accident involving a drunk driver, contact Daggett Shuler Law for help. An experienced Drunk Driving Accident Attorney can handle your entire case and work to secure fair and just compensation for you.

If you have questions about a drunk driving accident, call Daggett Shuler at 800-815-5500. When you call, you will speak with a Winston-Salem, North Carolina Drunk Driving Accident Attorney absolutely FREE. We will investigate every detail of your situation at no cost to you—and fight hard to secure the compensation you deserve. 

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