>I assume that this law was based on extensive research that showed 18-20 year old intoxicated drivers are a significantly greater threat to society to 21+ years old intoxicated drivers.
>
>Of course, I could be wrong about that...
>
>Peter

Um, not to question "extensive research" which is obviously always correct, :-) but how would the age of an intoxicated driver affect the threat level of that driver, if both are intoxicated to the same degree?