Polygraph lie detector tests

Polygraph Tests

can help resolve:

Relationship Trust Issues

Sexual infidelity

Allegations of Theft

Allegations of Abuse

Allegations of Fraud

Confirm innocence

Sexual abuse

Employer/Employee trust

Lie Detection Service

The lie detector test.

A polygraph examination usually takes around 2 hours from beginning to end and consists of three different phases; pre-test interview, collection of charts, and analysis of charts.

The Polygraph charts are generated by attaching four components to the subject.

Some of the changes that occur may replicate those that have been linked with truth or deception for many years.
These physiological changes have been the subject of various research projects and I have undertaken many hours of polygraph chart analysis instruction to interpret them.

• Pnuemograph - Two rubber pnuemograph tubes are placed around the subject's upper chest and abdomen; these record breathing and movement.
• G.S.R - The GSR or galvanic skin response is traced by placing two fingerplates across the subject's ring and index finger of the right hand. These trace changes in skin resistance during the examination.
• Cardiosphygmograph - This component traces changes in the subject's relative blood pressure and pulse rate, and is similar to the pressure cuff your doctor uses to take your blood pressure.

While the subject is attached to the equipment described above, he is asked agreed and carefully constructed questions, and in replying his body generates tracings on the polygraph charts. In analysing these tracings, the examiner reaches a conclusion to the subject's honesty regarding the issue.

Question Formulation - We only carry out polygraph tests using the latest question techniques. These techniques are widely accepted in Law Enforcement throughout the USA.

Our examiners will work with the client to construct questions that cover the test issue as well as meeting the strict rules that ensure validity. The latest techniques allow a maximum of three relevant questions within a test.

All questions are fully reviewed and agreed with the subject before the test commences. The test can only be completed with the examiner and subject present, no other person is permitted in the room at the time of the examination.

A polygraph examination typically takes around 2 hours from beginning to end, and consists of three different phases; pre-test interview, collection of charts, and analysis of charts.

Pre-test interview - during the pre test interview the examiner will explain how the polygraph works. He will then discuss the specific issue, develop and review all the questions to be asked on the polygraph test. This stage is normally the longest to complete and can take anything from 45 to 90 minutes.

Collection of Charts- During this phase the subject will be attached to the polygraph. The set of questions, which was developed during the pre-test interview, will be asked several times. During this stage only the examiner and subject will be present.

Analysis of Charts- Once the examiner has collected the charts he will analyse the results before giving a decision as to the subject's truthfulness or deception.