Our ports have about the greatest vulnerability, and they cannot be controlled in any way by Arabs who don't like us. This is just plain NUTS.
It is my understanding that this is the doing of the Treasury Department, and they don't have a clue about security, but SHOULD.
if you really want to do some reading:
www.fas.org/sgp/crs/homesec/RL31733.pdf
is the CRS Report for Congress on Port & Maritime Security.
It contains data, scenarios and concerns.