Man, this topic makes me hot under the collar! If the CITES inspector allowed the entry,the plant should be legal. Forget "illegal 'forever'" that is quite honestly not true. If the plants were allowed into the USA, for example the WOC hangianums, ownership is legal, but commerce in them is not (this is how it was explained to me). Legally, if you trade in the no-no species, you risk the punishments, and those that own "rescue centers" reap the benefits of your labor. It's a very tidy arrangement for the "rescue-centers" and the Government!
EDIT: Because I become agitated about this topic, please assume that anything I say that may be mean or rude is not directed at anyone on this board