Final answer:
The legal BAC limit for someone over 21 is set by each state, but generally, the National Minimum Drinking Age Act of 1984 required states to raise it to 21 or face a reduction in federal highway funds.
The legal BAC limit for driving under the influence (DUI) in the United States is generally set at 0.08%. It is important to adhere to these limits and avoid drinking and driving.
Step-by-step explanation:
The legal BAC (Blood Alcohol Concentration) limit for someone over 21 varies depending on the state they are in. However, the National Minimum Drinking Age Act of 1984 required states to raise their minimum drinking age to 21 or face a reduction in federal highway funds.
In the United States, the legal BAC limit for driving under the influence (DUI) is generally set at 0.08%. If a driver's BAC exceeds this limit, they can be charged with a DUI offense. It's important to note that BAC limits can differ for certain groups, such as commercial drivers or drivers under the legal drinking age.
Overall, it is crucial for individuals to abide by the legal BAC limit and avoid drinking and driving to ensure the safety of themselves and others on the road.