Well, maybe you ought to be more clear with this interlock device you are talking about. Because the way you aree describing it, it's like having a brain scan determine whether or not I'm going to speed every time I get behind the wheel.
"I" as a non drinker do not want or need a device on my car to give me permission to drive. Nor do "I", as a habitual speeder, need a device on my car that would give me permission to drive nor record my speed for future reference if I do so. Both are invasions of my privacy. While you interlock may work for habitual drinkers, most Americans would not approve of them in their own cars.