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All 50 states have now set .08% blood alcohol concentration (BAC) as the legal limit for driving under the influence (DUI) or driving while impaired (DWI). For commercial drivers, a BAC of .04% can result in a DUI or DWI conviction nationwide. For those under 21 years old, there is a zero tolerance limit―even the smallest amount of alcohol is grounds for a DUI or DWI arrest.