Can You Operate A Motor Vehicle?

Ok - a hot button. DUI. CNN posted this morning "DUI gizzmo might have been wrong 2 years." Is this another technicality that can be one more reason for us to not take this topic seriously? Now, laws vary by state on level of BAC, but the question remains - if we have altered our perceptions (aka: one of the reasons we drink alcohol) are we of right mind to operate a motor vehicle? Bsafe.