Those who have ever had cause to look up drunk driving laws know that across the U.S., the rule is that any BAC 0.08 percent or higher is trouble. That’s because every state has laws setting 0.08 percent BAC at the level of legal intoxication. Except for rare cases, like young drivers under 21 or commercial vehicle operators, everyone else just needs to keep their blood alcohol concentration below 0.08 to stay on the right side of the law. As of now, that’s no longer the case.