Under the federal regulations, what minimum level of Blood Alcohol Content (BAC) constitutes a violation of the laws prohibiting Boating Under the Influence of Alcohol (BUI) on commercial vessels?

Correct Answer: Option D — .04% BAC

Title 33 CFR 95.020 establishes that operating a commercial vessel with a Blood Alcohol Concentration (BAC) of 0.04% or more by weight constitutes a federal violation of Boating Under the Influence (BUI) regulations, which is stricter than recreational limits.