Final answer:
A BAC of 0.08 or over while driving results in an automatic DUI in almost all US states. Measuring BAC is done using breath or blood testing, and factors like size and metabolism can influence BAC levels.
Step-by-step explanation:
Having a BAC of 0.08 or over while driving will result in an automatic DUI. This is because in almost all US states, a blood alcohol level of 0.08% by volume is considered legally. It's important for drivers to recognize that alcohol can impair their ability to perform tasks that require skill and judgment, and driving under the influence is both illegal and dangerous.
Testing for BAC can be done through blood or breath testing, and devices like the Breathalyzer can help law enforcement officers determine if a person is over the legal limit. Alcohol intoxication typically presents after consuming two or more alcoholic drinks, and factors like a person's physical size, metabolism, and the amount of alcohol consumed can affect their blood alcohol level. Remember that driving with a BAC at or above 0.08% is a serious offense that can result in legal consequences.