An Example of How the Myth of the Lie Detector Is Perpetuated

An article published today in a small town newspaper provides a good example of the sort of shoddy reporting that perpetuates the myth of the lie detector. Lisa Rogers reports for the Gadsden, Alabama Times:

Polygraphs useful law enforcement tool
By Lisa Rogers
Times Staff Writer
Published: Saturday, March 6, 2010 at 9:37 p.m.

A suspect in a sex crime confessed after failing a lie detector test and even confessed to trying to beat the test by doing research on the Internet.

There are several Web sites that claim to have information that teaches someone how to beat a test, said Fred Lasseter, a licensed polygraph examiner and investigator with the Etowah County Sheriff’s Office.

“They tell you things to do to try to beat the system,” Lasseter said, “but beating it takes years of practice. It is very difficult to try to manipulate the system.”

Polygraph operator Fred Lasseter is lying. It doesn’t take “years of practice” to learn how to beat a lie detector test, nor is it difficult. In peer-reviewed research (cited in the bibliography of The Lie Behind the Lie Detector), about half of test subjects were able to fool the polygraph with no more than 30 minutes of training. The fact that a stupid criminal failed to pass a lie detector test and confessed should not be misconstrued as evidence that 1) the polygraph is difficult to beat or 2) that the polygraph is accurate as a lie detector. It is neither. Continue reading “An Example of How the Myth of the Lie Detector Is Perpetuated”

DOJ Rationalizes Away Polygraph’s Failure to Catch Alleged Anthrax Killer Bruce Ivins

Bruce E. Ivins
Bruce E. Ivins

On Friday, 19 February 2010, the U.S. Department of Justice announced the conclusion of its investigation into the 2001 anthrax attacks. The DOJ maintains that  Dr. Bruce Edwards Ivans, who in 2002 passed a polygraph test regarding the anthrax attacks, was the sole perpetrator.

In an investigative summary (640 kb PDF), the DOJ characterizes Ivins’ passing of the polygraph as part of an effort to “stay ahead of the investigation,” alleging (at p. 84, fn. 51) that he used countermeasures to fool the polygraph:

In some sense, Dr. Ivins’s efforts to stay ahead of the investigation began much earlier. When he took a polygraph in connection with the investigation in 2002, the examiner determined that he passed. However, as the investigation began to hone in on Dr. Ivins and investigators learned that he had been prescribed a number of psychotropic medications at the time of the 2002 polygraph, investigators resubmitted his results to examiners at FBI Headquarters and the Department of Defense Polygraph Institute for a reassessment of the results in light of that new information. Both examiners who independently reassessed the results determined that Dr. Ivins exhibited “classic” signs of the use of countermeasures to pass a polygraph. At the time the polygraph was initially examined in 2002, not all examiners were trained to spot countermeasures, making the first analysis both understandable under the circumstances, and irrelevant to the subsequent conclusion that he used countermeasures.

Although the summary doesn’t state what “classic” signs of countermeasures Ivins allegedly displayed, Michael Isikoff of Newsweek reported in 2008 that the FBI “concluded he’d used ‘countermeasures’ such as controlled breathing to fool the examiners.”

Continue reading “DOJ Rationalizes Away Polygraph’s Failure to Catch Alleged Anthrax Killer Bruce Ivins”

How Tom Henry Beat the Polygraph

In an oral history posted on YouTube, musician Tom Henry recounts the story of how, as a young Navy seaman, he was caught with a pound of marijuana in his locker, but escaped punishment after fooling the lie detector:

The technique Tom thought of for fooling the lie detector (dissociation) wasn’t very sophisticated. But it evidently worked against what, given the time (1966) was very likely a Relevent/Irrelevant polygraph “test.” For more on various polygraph techniques and how they can be manipulated, see The Lie Behind the Lie Detector (1 mb PDF).

Tom Henry’s story helps highlight the foolhardiness of relying on polygraph results. For more background on how Mr. Henry came to have a pound of marijuana in his locker, see his preceding video, Busted for Pot.