Scott Ritter spoke at Caltech on Nov. 13th, 2002. You can listen to the entire speech over there:

 http://www.sass.caltech.edu/events/ritter.shtml

and the link was added to the DC Indymedia running archive on Ritter, available here:

 http://dc.indymedia.org/front.php3?article_id=39033&group=webcast