The short answer is .08% blood alcohol or breath alcohol content. The more complicated answer is that impairment is the standard and if proven below .08 the legal limit does not apply. If you are above .05 but below .08 you have no presumption of impairment or sobriety. If you are below .05 you are presumed to not be impaired but the state can attempt to show otherwise (they typically will not go forward without positive drug tests below .05 but some over zealous prosecutors will go forward on impairment theory under .08 but above .05. At .15 the penalties are enhanced.
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