How about after the first DUI, if you kill someone as a result of a DUI you can be prosecuted for a crime comparable in severity to 2nd degree murder. Sieze the car and then sieze the drivers license for a year for the first offense, sieze every vehicle the person owns the second time and ban them from driving for 5 years (plus 2-3 years in prison on a felony charge) and after the third offense put them in prison for 10 years and ban them for life from driving. If they get caught driving for anything other than a certifiable emergency or to get away from an attacker (or similar scenario) during a driving prohibition jump immediately to the punishment for the 3rd DUI. That's how you cut down on DUIs.