Defense Intelligence Agency documents (40 MB .zip archive) obtained by AntiPolygraph.org suggest that the agency lacks the ability to detect sophisticated polygraph countermeasures1 and that spies, saboteurs, and terrorists will have little difficulty deceiving its polygraph operators using techniques such as those described in AntiPolygraph.org’s free book, The Lie Behind the Lie Detector (1 MB PDF) or in Doug Williams‘ manual, How to Sting the Polygraph. The U.S. Government is so concerned about the effectiveness of such techniques that it has targeted Doug Williams for criminal prosecution and may have attempted to entrap AntiPolygraph.org co-founder George Maschke.
It should be noted that the DIA polygraph screening program has never caught a spy. In 2001, the DIA’s senior analyst for Cuban affairs, Ana Belen Montes, was arrested, charged, and ultimately convicted of spying for Cuba. She had in fact been acting as a Cuban agent from the very beginning of her DIA employment: she had been trained by Cuban intelligence how to fool the polygraph, and she succeeded in doing precisely that throughout her DIA career.