Alcohol is associated with accidents, violence and over 250 disease! Yet the government has already made zero-tolerance for driving with marijuana. Marijuana does not even impair you, it is a psychedelic while alcohol is a CNS depressant.  Once again we see how politicians make decisions based on 'how they feel' rather than scientific facts.
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There should be zero-tolerance on alcohol because it encourages to have a couple of drink and a couple more as we know alcohol is highly addictive. Obviously this would set a precedent for people not drive at all while drinking is the wise thing to make it socially unacceptable to have a few drinks at a bar.
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The issue people are not understanding is that you can have 2 drink legally then smoke marijuana it will be like 5 drinks, the marijuana amplifies the booze. Marijuana is a safe alternative to alcohol is extremely narrow minded for the government prohibit it when driving, at least not at the same time.