Which driver would be considered to be violating the law?

The choice indicating that a 21-year-old with a BAC of .09 is violating the law is correct because, in most jurisdictions, including Georgia, the legal Blood Alcohol Concentration (BAC) limit for drivers who are 21 years of age and older is set at .08. Therefore, a BAC of .09 exceeds this legal limit, making it illegal for that individual to operate a vehicle.

This distinction is crucial for understanding laws surrounding alcohol consumption and driving. A BAC level above the legal limit indicates that the driver is impaired and poses a greater risk to themselves and others on the road. In contrast, the other scenarios involve BAC levels that do not violate the law for their respective age groups: the 18-year-old is underage and therefore should not be driving with any measurable alcohol, but is below the typical legal limit for driving under the minimum legal drinking age. The 25-year-old, although at the legal limit of .08, is still legally permitted to drive. Lastly, the sober 21-year-old is compliant with the law.

Understanding these legal distinctions is important for safe driving practices and maintaining compliance with state laws.