In-car breathalyzers for DUI offenders curb drunk-driving deaths by 15 percent

State laws that require drivers who've been convicted of drunk driving to pass a breathalyzer-type test before starting their cars saved an estimated 915 lives between 2004 and 2013, according to a new study. The findings represent a 15 percent reduction in drunk driving-related deaths compared to states without legislation requiring DUI offenders to use 'mandatory ignition interlock.'