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here is a chart from the Dept of Health and Human Services. But, all it could take is one drink - so I don't risk it.

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I agree that "all it could take is one drink" but I also see this type of thinking as a problem. People drink at bars and they drive home for the most part afterwards, that's a fact possibly a sad one for some people who have lost loved ones to drunk driving accidents. I think people should have some way of figuring out whether they are over the legal limit WITHOUT involving the police.

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You can buy a personal breathalyzer. If the chart is not good enough and this is a big concern, I would think this is a good option.