An obvious middle ground is that anyone convicted of DUI must [for some long period of time] have an alcohol detection system installed in any car they wish to drive.
Perhaps then mandate that cars be compatible with some standard for such systems to try to bring the cost of them down - the actual alcohol sensor is mere cents, but integrating it into todays cars aftermarket is often very costly.
Perhaps then mandate that cars be compatible with some standard for such systems to try to bring the cost of them down - the actual alcohol sensor is mere cents, but integrating it into todays cars aftermarket is often very costly.