The possibility of a fatal crash rises once a person's blood alcohol concentration (BAC) reaches 0.05 percent - and goes even higher when BAC reaches 0.08, the legal limit for drunk driving across the U.S. Just how much alcohol can someone safely drink before becoming too impaired to drive? It depends mostly on gender and weight (heavy people and men can drink more). But experts say a good rule of thumb is to have no more than one drink an hour. One drink means 12 ounces of beer, five ounces of wine, or a mixed drink containing one shot of 80-proof alcohol.
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