"Ignition interlock system" means a device that (i) connects a motor vehicle ignition system to an analyzer that measures a driver's blood alcohol content; (ii) prevents a motor vehicle ignition from starting if a driver's blood alcohol content exceeds 0.02 percent; and (iii) is equipped with the ability to perform a rolling retest and to electronically log the blood alcohol content during ignition, attempted ignition and rolling retest.
"Rolling retest" means a test of the vehicle operator's blood alcohol content required at random intervals during operation of the vehicle, which triggers the sounding of the horn and flashing of lights if (i) the test indicates that the operator has a blood alcohol content which exceeds 0.02 percent or (ii) the operator fails to take the test.
Virginia Code § 18.2-270.1
Also, here is link to a great bit by comedian Dan Cummins, talking about his interlock device, describing the hazard that is actually created by this "safety device."
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