The MSNBC.com website features a Wall Street Journal article by Ann Davis, Joseph Pereira and William M. Bulkeley titled, "FBI, Customs talk body language" (http://www.msnbc.com/news/794455.asp?cp1=1) that may be of interest, as attempting to read "body language" is a part of the polygraph process. (See the Department of Defense Polygraph Institute Interview and Interrogation Handbook (http://antipolygraph.org/documents/dodpi-interrogation.pdf) (5.2 mb PDF) and The Lie Behind the Lie Detector (http://antipolygraph.org/pubs.shtml) for further reading.)
Interestingly, FBI Special Agent Joe Navarro, who lectures on the subject, tells the Journal, "We believe the study of nonverbal behavior has progressed to such a degree that in capable hands, it is now more accurate than lie-detector tests."
SA Navarro has co-authored an article titled "Detecting Deception" that appeared in the July 2001 issue (http://www.fbi.gov/publications/leb/2001/july2001/july01leb.htm) of the FBI's Law Enforcement Bulletin (http://www.fbi.gov/publications/leb/leb.htm).