In the 18 states that require in-car breathalyzers with ignition interlocks for anyone convicted of drunken driving, researchers have observed a 15% decrease in alcohol-related deaths. Researcher Dr. Elinore Kaufman adds, “Other states have proven [a mandatory interlock law] is feasible, and we’re contributing proof that it is effective. There should be no remaining barrier for the remaining half of states to adopt it.”
American Journal of Public Health, March 2016