The risks associated with polygraph testing

This form of opinion evidence is particularly controversial as the scientific validity and reliability of these tests have not been accepted by our Courts or the Health Professionals Council of South Africa. At best, it provides an indication that one has a strong emotional response to a question, and by no means does it constitute proof that an employee is lying or being untruthful. Therefore, even if the polygraph evidence is admitted it will generally only serve as corroboratory evidence in support of other evidence against an employee.