What is the legal blood alcohol content (BAC) limit for drivers over 21 in Massachusetts?

Answer: B — 0.08%

In Massachusetts, the legal blood alcohol content (BAC) limit for drivers over 21 is 0.08%. This threshold is established by state law to determine impairment due to alcohol consumption while operating a motor vehicle. If a driver's BAC is at or above this limit, they can be charged with operating under the influence (OUI), as it is generally understood that a BAC of 0.08% or higher significantly affects a person's ability to drive safely. This standard aligns with laws in many other states across the U.S., reflecting a national consensus on acceptable limits for responsible driving. Consequently, understanding this limit is crucial for anyone of legal drinking age to ensure they remain within the legal confines while driving.