Re:Nice idea, but... (Score 1)

This seems like an elective, preventative technology. The people that would purchase something like this would most likely be parents for a shared or primary teen-used autombile. As some posts above mention, adults might also choose to purchase such as device as well. The cost of preventing a DUI or accident will almost definately be lower than the costs. That said, many states currently require breathalizers to be installed and attached to the ignition of cars for repeat DUI offenders - at the drivers cost.