I question the claim that US scientists are forbidden, (by whom?), to tell anything that they may know about the gulf oil spill. There seems to be plenty of consultation going on between scientists in Aus, and the rest of the world, and scientists in the US. All of which is public information, and easily accessable, at least in Australia, and I haven't seen any evidence of any scientific findings being banned in the US. The only people who are spouting this are bloggers from dodgy web sites, such as this so called 'Dr' James.
Fear mongering at its worst, but I would expect nothing less from 'Dr' James and his ilk.