The National Highway Traffic Safety Administration encourages States to enact enhanced sanctions for drivers with a blood alcohol concentration (BAC) of .15 grams per deciliter (g/dL) or greater. The rationale for high-BAC sanctioning systems is that driving while intoxicated (DWI) offenders with higher BACs are more likely than DWI offenders with lower BACs to be involved in a crash. A driver with a BAC of .15 g/dL or greater is at least 20 times more likely to be involved in a fatal crash than a sober driver. During an average weekend night, about 1 percent of drivers have BACs of .15 or greater and about two-thirds of fatally injured drinking drivers have BACs of .15 or greater. Enhanced penalties for first-time high-BAC offenders should be comparable to those applied to repeat offenders.


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