David Westerfield's taped polygraph and interrogation was released. It should make for interesting analysis since public availability of these are pretty rare. The SDPD should be given credit for taping everything. This also demonstrates an area where the polygraph, even as a prop, can be effective.

George, if you can get the transcript/tape it should make for excellent site library material. CQT test than can be analyzed in detail including issues such as fear of detection vs fear of consequences - a real problem here for using the poly as more than an interrogation prop.

It is also being reported that the police told Westerfield that he failed with a 99% probability and that all others that had taken the polygraph had passed. This is standard interrogation technique true or not but is being reported uncritically as fact rather than interrogation technique. It is also clear that Westerfield, an accomplished engineer, had no idea how the polygraph works. That's actually a pretty good control question they used since they had info from a sympathetic ex that he had been violent with her once when drunk.

Some of the questions asked are listed.  It was interesting to hear some of the questioning - interrogation in action. He did not confess directly but sounds guilty as hell.

They had to cut the interrogation off once he suggested getting an attorney. Professional job, IMO.

It should also be noted that later, his attorney was in negotiations to tell them where the body was in return for life.

[From the S D Union Tribune]
The test involved Redden reading Westerfield a series of questions in groups of about 10. The questions included, "Is your first name David?" "During the first 45 years of your life, do you remember hurting anyone when you were drunk or angry?" and "Regarding the disappearance of Danielle van Dam, do you know her whereabouts at this time?"

http://www.signonsandiego.com/news/metro/danielle/20030109-9999_1m9david.html


-Marty