Great subject, or time waster depending on your day. Interesting read of the 4-5 I found and actually read on the subject...no, its NOT the JONES ACT, which pertains to cargo only., it IS the PASSENGER VESSELS SERVICES ACT and the REAL "reasoning" behind the prohibition, which includes cruise ship private islands, which is a relatively new phenomenon, is astounding...I call it "isolationist paranoia" but what do I know. Its the CREW that causes the problem. At least I can say I did SOMETHING useful today.
My thanks to CARNICRUISER for bringing it up....or place the blame heheheheh