Polygraph Examination
Initial Interview with the investigator 👤
Pre-Test Interview 👥
Instrumentation ❓
Post-Test
Receive letter request in quadruple copies
Review Facts of the Case with the investigator
Get sworn statements of complainant, suspects and witnesses
Review case folders including investigation reports, crime scene sketch, photographic evidences etc.
Get the personal information of the subject
Brief the subject with the objective of the test
Aquaint the subject with the polygraph machine
Review all the questions to be asked during the actual test
Determine the suitability of the subject to the test
Psychological and physical evaluation conducted
Physical, Medical and Psychological Evaluation
Inform his rights under the constitution and existing confession laws
Warn the subject about the legal consequence of lying
Subject must seat comfortably
Subject is instructed to relax
Subject will be asked questions answerable by yes of no
Qhestions are combination of irrelevant, relevant and sometimes control questions
Attach the pneumograph sensors
Place the cardiosphygmograph sensors
Attach the finger electrodes to the other hand (index and ring fingers
Get baseline recordings as you ask irrelevant questions
Once the baseline tracings are stable ask relevant questions and comparison questions in an alternate manner
Adapt a polygraph questioning format suitable to the test e.g. General Question Test (GQT), Control Question Test (CQT), Peak of Tension Test (POT), Zone Comparison Test (ZCT) etc.
Consider suggested stimulus markings and identifiers for later interpretation and analysis
If the examiner finds No Significant Response as seen on the Chart, release the subject cordially and thank them for their cooperation
In cases where their is a strong indication of deception as shown on the chart, work on getting a confession by applying the Reid Technique of Interrogation
If indications of deception are detected on responses to control questions, conduct probing technique to verify hidden informations concealed by the subject; work on possible admission by the subject
In cases of confession is made, be sure to reduce it in writing in the presence of the subject's lawyer; confession must be voluntary and signed by the subject
Obtain consent
Miranda warning
To condition the subject for the test
Must have eaten his/her meal prior the test
In case of female subject, must not be pregnant at the time of the test
Have not smoked 2 hours prior to the test
Not experiencing any pain from illness or disease
Subject must have enough sleep