Carole London -Williams Polygraph Services
0845 094 2839
Tel: 0845 094 2839
Professional Lie Detection Service
using the latest Polygraph Lie
Detector equipment.
using the latest Polygraph Lie
Detector equipment.
Polygraph Lie Detector Tests
undertaken throughout
Scotland, The UK & Europe.
undertaken throughout
Scotland, The UK & Europe.
Major credit cards accepted
Lie Detector Tests. Scotland, UK & Europe.
Polygraph Lie Detector Tests
Forensic Psychophysiologist (more commonly know as polygraph examiner) using the polygraph in Truth Verification - Lie Detection.
The term 'polygraph' means 'many writings'. The name refers to the manner in which selected physiological activities are simultaneously collected and recorded.
Forensic Psychophysiologist (more commonly know as polygraph examiner) using the polygraph in Truth Verification - Lie Detection.
The term 'polygraph' means 'many writings'. The name refers to the manner in which selected physiological activities are simultaneously collected and recorded.
What does a polygraph test involve?
A polygraph instrument collects physiological data from at least three systems in the human body. Convoluted rubber tubes placed over the examinee's upper chest and abdominal area will record respiratory activity. Two small metal plates attached to the fingers or hand, record electro-dermal (sweat gland) activity. A blood pressure cuff or similar device records cardiovascular activity (blood pressure and pulse).
A polygraph examination involves three phases. These are the pre-test interview phase, the in-test phase and the post-test interview phase. A typical polygraph examination lasts around 2 hours, sometimes longer.
In the Pre -Test phase: I will complete the required paperwork, discuss the issues concerning the examinee. We will review and agree to the questions pertaining to the issue. Inform the examinee of polygraph test procedure and the polygraph instrument.
On completion of the polygraph test and collection of the chart phase, following this I will analyze the chart and render an opinion as to the truthfulness of the person taking the test. NOTE: It is important to state that a polygraph does not include the analysis of physiology associated with the voice. Instruments that claim to record voice stress are not polygraphs and have not been shown to have scientific support.
A polygraph examination involves three phases. These are the pre-test interview phase, the in-test phase and the post-test interview phase. A typical polygraph examination lasts around 2 hours, sometimes longer.
In the Pre -Test phase: I will complete the required paperwork, discuss the issues concerning the examinee. We will review and agree to the questions pertaining to the issue. Inform the examinee of polygraph test procedure and the polygraph instrument.
On completion of the polygraph test and collection of the chart phase, following this I will analyze the chart and render an opinion as to the truthfulness of the person taking the test. NOTE: It is important to state that a polygraph does not include the analysis of physiology associated with the voice. Instruments that claim to record voice stress are not polygraphs and have not been shown to have scientific support.
Will my nerves mean I fail the test?
Whilst taking a polygraph test is generally a new experience for every person I see, the fact remains that undergoing a polygraph is just like taking any other test and nerves are expected.
A truthful person starts the test feeling nervous just as a deceptive person does. However the deceptive person has the problem that the lie they are telling will cause a heightened level of response that will uncover the deception relating to the issue they are facing.
A truthful person starts the test feeling nervous just as a deceptive person does. However the deceptive person has the problem that the lie they are telling will cause a heightened level of response that will uncover the deception relating to the issue they are facing.
Test Accuracy?
The American Polygraph Association (APA) has gathered over 200 studies on the subject, you can view further information at their web site.
Based on twelve separate studies involving 2174 actual cases since 1980, evidence suggests that qualified polygraph examiners are 98% accurate in their overall decisions (Refer: Ansley, N 1990 The validity and reliability of Polygraph examinations in real cases).
Based on twelve separate studies involving 2174 actual cases since 1980, evidence suggests that qualified polygraph examiners are 98% accurate in their overall decisions (Refer: Ansley, N 1990 The validity and reliability of Polygraph examinations in real cases).
