Many people wonder if a deceptive person can beat the polygraph test. This is very unlikely when the examination is administered by a qualified examiner.
A qualified examiner can easily detect abnormal "countermeasure" behaviour. The polygraph records medical changes in a person's autonomic reactivity as they answer questions, and any attempt at deception will be evident in the readings.
Duration
One and a half to two hours: pre-interview, the test itself, then analysis of the data.
Nerves
Expected, and taken into account. Nervousness is not a problem.
