The punishment, if this is the case, would be absurd.
I just re-read the article. The article never says what the captain tested out at, only that it was a violation of Federal Maritime law to operate with over .04 level of alcohol. He could have been .04 or .1. In any event, as a ship's captain he had to know the law. Violation of Federal laws is a pretty quick ticket to losing your job, or the White House, if you're a democrat.