It's already illegal to drive under the influence of ANY drug (over the counter meds, alcohol, et al). Not sure why it would make anyone feel better if they have a family member killed because a jerk who broke two laws instead of one law. We hold drunk responsble for their actions. We likewise hold stoners responsible for theirs. Unless you're getting at supposed preventative laws...in which case, I'm sure there will be much less drunk driving related deaths if we had no private car ownership, if everyone were required to be on state sponsored public transportation on our public roads. But I don't believe I'd like to live in such a state.