''The worst lies are the lies we tell ourselves. We live in denial of what we do, even what we think''
                                   -Richard Bach

For more than a week now, Noida, in Northern India, has been in the eye of the storm. The events that unfolded revealed that two ‘local blisters’, Moninder Singh and Surinder Singh were ‘preying’ on children.

The ruthlessness of the crime chilled the marrow of fair-minded people across the length and breadth of the country. These men, who are the proud owners of a sick mind, are a blot on the species and everything needs to be done to ensure that they are brought to book.

Most criminals, like the above mentioned, deny the crime they are charged with, and resort to consistent lying. A device that was launched with much aplomb, all over the world, to deal with criminals and tricksters is, the ‘Lie Detector’.

Where ‘lies’ truth?
Lying defies age and transcends barriers of class, creed and color. It is generously used as a defense weapon to save trouble, either with the law enforcers or with any figure of authority. Most of us lie and indulge in deception at some stage of our life, even if it is only in complimenting the looks of a person who is having a ‘bad hair day’! Many a marriage has been salvaged by timely lies, delivered with flair and ease. Generally, megaly of the nose does not occur on telling a lie, as in the fable ‘Pinocchio’. Therefore detecting lies, especially when dealing with hard-core criminals, becomes a ‘mission impossible’.

If a criminal, who has maimed the well being of a society lies, then those words of deception need to be investigated with the gravity it deserves. The uneasy feeling that develops in one’s gut on hearing a lie, will not hold in a court of law. That is when the ‘lie detector’ steps in and attempts to delve into the dark recesses of the offender’s mind. ‘Lie Detectors’ are generally put to use by the police and by other investigating agencies when dealing with spies, hardened criminals and sometimes, first-time offenders.

The Way the ‘Cookie’ Crumbles
Polygraphs, dubbed ‘lie-detector’ by the media, are a combination of medical devices designed to detect changes that occur in the body in response to stressful conditions. Contrary to popular belief, a polygraph does not detect lies. Instead, it monitors variations in certain physiological parameters, like heartbeat, blood pressure, respiratory rate and the sweatiness of the fingertip when a person is being interrogated. Some Polygraphs also record leg and arm movement.

The subject sits on a chair and several air- filled tubes and wires are connected to the chest and abdominal region. A cuff is placed on the upper arm to detect blood pressure. Galvanometers or fingerplates are attached to the fingertips of the candidate. When subjected to questioning, variations in the physiological responses of the subject are translated into electrical signals that are registered on a graph. This is then compared to the standardized readings of normal responses. A signifant change is indicative of the examined person being deceptive. However, any conclusion that may be drawn from the readings of the polygraph rests with the interpretation of the examiner, who happens to be a Forensic Psycho physiologist