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How the in-car breathalyzer works (1:47)

1:47

April 9, 2012 11:08 AM EDT Ben Bastible, Virginia state director of Smart Start, explains his company's interlock device, which prevents drivers from starting their car if their blood alcohol level is over .02. Starting in July, Virginia will require first-time DUI offenders to have the device installed in their cars. (The Washington Post)

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