http://www.cnn.com/2003/LAW/05/14/moussaoui.trial/index.html from what i can gather from the article, Moussaoui and his lawyer are claiming that he had planned post 9/11 attacks, demonstrating that he wanted to live after 9/11 and hence couldn't have been the so called "20th hijacker". i think i remember something similar in a Law and Order episode.