|
WHO stole the money? Who is taking the stock? Who is lying to whom?
Petty theft and not-so-petty theft is part and parcel of the corporate environment. In many cases bosses don't want to publicise their losses or involve the police.
So, what to do about in-house crimes? In comes Gary Hewitt, a qualified polygraphist (forensic psychophysiologist).
He received his training from the Academy for Scientific Investigative Training in Philadelphia, USA.
Hewitt, who works in Paarl on a regular base, is a member of the American Polygraph Association and an active member of the Criminological Society of South Africa.
The popular name for the polygraph is "lie detector", but Hewitt says this is very misleading.
"Actually there is no such thing as a 'lie detector'.
"As a stethoscope cannot diagnose a medical disorder, but only a physician can, the same applies to the polygraph.
"The polygraph only records and measures physiological changes. To evaluate these changes involves much specialised care."
Hewitt demonstrated the polygraph on Paarl Post volunteer Eunice Consul.
Giggling nervously, she was connected to the polygraph by sensors on her body and fingers.
Hewitt, monitoring her responses on a computer screen, pointed out the sharp reaction in the graphics.
He started asking her questions like "Is today Thursday" and "Do you work at Paarl Post?"
These questions serve as stimuli and result in physiological reaction, a condition manifested by the human body.
Hewitt then went on to ask Eunice if she was completely at ease. Laughing, she said "yes", but from the responses on the monitor, the opposite was clear.
"You can't lie to the polygraph," explained Hewitt.
"When someone is asked a question about some wrongful conduct which he has in fact committed, that question is then perceived as a threat to that person's wellbeing.
"The body reacts to the threat, regardless of whether the threat is physiological or psychological.
"Among these changes, which are involuntary and beyond conscious control, are changes in blood pressure, pulse rate, respiration and electrodernal activity."
Disconnected from the polygraph, Eunice remarked: "I'd rather tell the truth than try to lie to that machine!"
Many people are sceptical about the accuracy of polygraph tests, but according to Hewitt this is directly proportional to the skill of the examiner administering the tests.
"The examiner must make judgments at all stages of the test, and these judgments determine whether the test is reliable."
He said the latest research indicated an average validity of 98 percent.
Voluntary consent
Hewitt emphasised that no-one can be compelled to undergo a polygraph examination unless contracted as such.
"A person must give voluntary consent in writing."
According to him the truthful are more than willing to submit to the examination.
"The deceptive normally feel they are the exception to the rule and can beat the polygraph. Mainly for these reasons, very few people actually refuse to submit to a polygraph examination."
Hewitt adds that science indicates it is not true that nervousness, psychopathic mendacity, rationalisation or drugs are likely to contribute to an erroneous diagnosis, since the technique used today is equipped to combat these factors.
Investigate
Generally employers will use the polygraph to investigate specific incidents such as where employees had access to the property which is the subject of the investigation or if there is a reasonable suspicion that the employee was involved in the incident.
"In employment context, the polygraph can also be used for pre-employment applicant and periodic employee screenings.
Hewitt can be contacted at tel 946-2608, fax 946-2609 or polygraph@telkomsa.net. |