US passports are no longer mandatory for travel from the Caribbean. The Western Hemisphere Travel Initiative requirement would have been effective 8 January 2007, but the US Department of Homeland Security had failed to publish it in the Federal Register as required by law, which means there will be a delay in the implementation of the new requirement.
There is still time for the administrative reprieve sought by the Caribbean to be developed and introduced. As reported by journalist John Collins, once Homeland Security publishes the requirement in the Federal Register, another 60 days need to pass before it becomes effective. Homeland Security has announced the postponement without establishing a new date for its introduction.