Final answer:
A Blood Alcohol Concentration of .08% defines a DWI in all US states. This threshold helps determine legal intoxication for driving purposes and is measureable through blood or breath testing, such as with a Breathalyzer.
Step-by-step explanation:
Having a Blood Alcohol Concentration (BAC) of .08% is the definition of a DWI (Driving While Intoxicated) in all states of the United States.
This level of intoxication is legally considered too impaired for operating a vehicle safely. Blood or breath testing can measure BAC, and in cases where a Breathalyzer is used, the reaction that measures ethanol concentration in the breath is the oxidation of ethanol by the dichromate ion. It is important for drivers to understand that alcohol consumption affects performance and judgment, and it's illegal to drive under the influence.
Legally, a BAC of greater than 0.025-0.080% typically defines alcohol intoxication. Alcohol begins to impair a person's abilities after approximately two drinks, and impairment increases significantly as BAC rises, with severe health risks occurring at higher levels.