Polygraphic test is basically is the such scientific technique which is used by the police and       agency during interrogation to verify the  recorded statement of the witness ,victim, accused and   suspected person ,which is recorded u/s 161 of CrPC .so,

·         Polygraphic test is conduct by police and agency.

·         Conduct of witness, suspected person, victim and accused.

·         Purpose to detect lie and find out truth.

·         Also known as lie detector or fear detector.

in this Article we will discuss the procedure of Polygraphic test , and discuss how much  this test is helpful to detect lie or truth ? and the   Evidencry value of this test .

1.               1. Procedure of Polygraphic test.

      That is the three stage process.

1.       Attachment of sensors to body.

Firstly, 4 to 6 sensors attached to human body.

2.       Question session

·         Secondly ,question asked to person

·         In that process 2 types of question asked

1. controlled Question –

These are normal Questions asked to person just to provide him comfort zone and reduce his anxiety.

·         Examples.

1.       Ask his name

2.       His source of income

3.       Family status

4.       Source of conveyance etc.

2. Relevant Question.

Here, all such Questions asked which are relevant to the matter of investigation.

·         Example.

1.       Are you really the eye witness of such incident?

2.       Time of the happening of offence etc. . . . 

  3.       Monitoring.

                  Here, the examiner examines the rate of 4 things.

1.                                    1.Blood pressure

2.                                    2.Respiration

3.                                   3. Heart beat

4.                                  4. Pasteurization /skin conductivity

                 In order to detect lie.

  2.How lie Detect .

If during monetization the examiner notice that rate of B.P and heart beat or the other two are not normal so they assume that the person is telling a lie.

3.Evidencry Value of Polygraphic test.

·         Polygraphic test is not consider stronger evidence because of certain reasons.

1.       Due to Drawbacks of Polygraphic test.

Nothing is ideal, same is follow Polygraphic test its also has some drawbacks.

1.       Chance of cheating.

In Polygraphic test there are the chances of cheating like if someone is habitual offender he know how to control his emotion? So there are the chances of falseness.

2.       Has the element of nervousness.

·         Moreover, the anxiety and nervousness of person may also adverse the result.

 

2.       Not voluntary confession.

Basically the confession which are obtained by the Polygraphic test are not consider the voluntary one so they are not consider admissible as like the confession u/s 161 of CrPC

·         Grounds to consider it non-voluntary confession.

It is consider that the confession obtained by Polygraphic test is basically the violation of the Art 13 of the constitution of Pakistan on the grounds of ‘’self-incrimination ‘’so that’s why consider to be non-voluntary one.

·         So, no conviction is granted on Polygraphic test.