"docked" in Seattle , This is the part that gets me. If the Vessel is docked, How can he be charged?
I would assume that they had SOME kind of suspicion that the guy had a "problem".
Quite frankly, if I were a passenger on that boat...OR on the crew of any of the huge container ships that ply the waters of Puget Sound...I wouldn't want a captain of anything that big who was anything other than stone-cold sober.
He's still captain, docked or otherwise.