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Male driver using breathalyzer Laws that require interlocks for both repeat offenders and offenders with high BACs provided an 8% benefit, according to a new IIHS study. (Photo: Shutterstock)

Laws requiring all impaired-driving offenders to install alcohol interlocks reduce the number of impaired drivers in fatal crashes by 16%, a new study by the Insurance Institute for Highway Safety (IIHS) has found. If all states without such laws adopted them, more than 500 additional lives could be saved each year, according to the IIHS.

Related: 3 groups looking to technology to stop DUIs

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