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LIE DETECTOR
NEW ZEALAND
"Confirming the truth"
INFORMATION

Equipment
Lie Detector New Zealand use the very latest state of the art computerized equipment - the Lafayette LX5000 Data Acquisition System and associated computer software. This equipment is top of the line and produced by Lafayette who are an American company specialising in Polygraph equipment. They are highly reputable, reliable and are world leaders in such technology and equipment.

This computerized equipment is linked to the instruments that are attached to the subject’s body. There are three parameters that are recorded – breathing, heart rate and sweat gland activity.

Two pneumographs are used to record breathing, one for the thoracic breathing and one for the abdominal breathing; a cardio cuff to record changes in blood pressure and pulse rate; two finger cuffs to record sweat activity.

In addition Lie Detector New Zealand use two separate movement sensors to detect subject movements primarily associated with countermeasures.

Lie Detector New Zealand when hand scoring Polygraph charts also use a Lafayette computerized numerical algorithm scoring system. This system is another valuable tool and is at the leading edge of Polygraph technology.

Accuracy
The figures relating to the accuracy of the Polygraph vary by a few % depending on the source of the study. Lie Detector New Zealand uses the Backster technique which an independent Israeli study concluded was 96% accurate.

Whilst reference is to accuracy, this term “accuracy” is misleading. The 96% actually means that in 96 out 100 tests the results were conclusive, that is either “Deceptive” or “Truthful”. It is an erroneous perception that the remaining 4% are errors. They are not errors or inaccuracies, they are simply inconclusive.

This 4% simply relate to 4 out of 100 where the Polygraph was unable to make a conclusive determination as to Truth or Deception hence the inconclusive result
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