CARLSON: My next guest is one of the leading voices in the increasingly noisy movement that claims our own government orchestrated the attacks of September 11th. David Ray Griffin is a theology professor and a member of the group Scholars for 9/11 Truth. He's also the author of the book, Christian Faith and the Truth Behind 9/11: A Call to Reflection and Action. That book is published by the Presbyterian Church's publishing arm. Mr. Griffin...you have no evidence that the government's behind 9/11. GRIFFIN: These things have to be determined in terms of evidence. If you read this book and...my two previous books, The New Pearl Harbor, and then The 9/11 Commission Report: Omissions and Distortions, you will see there are literally dozens of reasons to disbelieve the official theory about 9/11. CARLSON: I'm merely saying it is wrong, blasphemous, and sinful for you to suggest, imply, or help other people come to the conclusion that the U.S. government killed 3,000 of its own citizens. GRIFFIN: I thought the same thing for the first year and a half. But then when I finally looked at the evidence, I saw that it was truly overwhelming. CARLSON: You say six of the hijackers may still be alive. What's the evidence? GRIFFIN: Both the BBC and the "Telegraph" put out stories -- let's take the one about Waleed al-Shehri. Several days after 9/11, he...announced to the world that he's still alive in Morocco where he's a pilot. We didn't get a word of that from the 9/11 Commission. [The 47-story WTC] Building 7 was not hit by an airplane. CARLSON: And it came down. GRIFFIN: The 9/11 Commission did not even mention in their 571-page report the fact that Building 7 collapsed.