A polygraph test, or lie detector test as it is often called, monitors a person’s response to a series of questions posed to them. Overall, these responses are recorded and later analyzed to determine a person’s truthfulness.
Polygraphists have been accepted as expert witnesses at the CCMA or relevant Bargaining Council whose evidence needs to be verified. The duty of the Commissioner is to determine admittance and the reliability of evidence. Polygraph tests may not be interpreted.
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A polygraph machine detects lies by looking for changes in the examinee's vital signs.... During a polygraph test, the machine first measures the baseline of the examinee's vital signs.
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