The polygraph test

At the polygraph test we seek the truth and to achieve this it is necessary to follow a series of steps, each one more or equally important than the previous one.
The polygraph test

The interview

The polygraph test

Before a polygraph test is conducted, a good interview is crucial in order to delve deeper into the cause of the problem. Knowing the subject who is going to take the polygraph test, the various situations in order to be able to better establish the types of questions to be asked.

The subject must sign a written voluntary consent form stating that he/she agrees to take a polygraph test, giving as much personal information as the polygraph technician requires, in terms of any illnesses he/she has had or has and whether he/she is taking any medication.

The staff of the centre may ask the subject to administer various tests, such as psychological tests, drug tests (in case of suspicion of drug use), check possible "countermeasures" that the subject has planned to try to adulterate his physiological reactions, etc...

Elaboration of the questions

The number of questions to be asked, normally between no less than 3 and no more than 5, of each type of question: relevant, control or irrelevant, being of two types:

Questions

Relevant

The aim is to evaluate the subject's sincerity in their answer, control questions in which a highly suggestive reaction is expected from the subject, due to embarrassment, fear, etc., and it is expected that they will want to lie about it.

Questions

of control

Control questions are those in which the aim is to generate an intense emotional and physiological reaction in the subject in order to be able to compare it with the physiological reactions established in the relevant questions.

Questions

Irrelevant

These do not provoke any reaction in the subject to be tested. All questions are loaded into the polygraph software, setting up different series with different order of questions, sensors and electrodes are connected to the polygraph and to the computer.

Test preparation

The polygraph test

The posture of the subject before the polygraph test It is important at the time of testing that you are barefoot, with your feet flush with the wall, wearing comfortable clothing and without accessories that may discomfort or oppress the recording of sensors and electrodes.

He/she should be facing the wall, on a neutral plane, without stimulation, as pupillary dilation can sometimes be controlled, and his/her gestures and micro-expressions can be recorded.

Once seated, the subject is asked to sit on the recording pad, which assesses the subject's motor response. Once seated, the resistance-measuring electrodes are placed on intercalated fingers, together with electrodes placed on the same hand, which measure conductance, to obtain a complete record of the subject's motor response. galvanic skin sweating.

Subsequently, the pleistesmographThe cuff is placed on the back of the thumb of the same hand to assess blood volume, in conjunction with the cuff placed above the crease of the arm, at 2-3 cm, with the manometer at a pressure of 60 mmHg, to see the individual's cardiac response.

The polygraph test
The polygraph test

The Test

The polygraph test

Once the instrument has been calibrated, the technician proceeds to perform the polygraph test with the questions in a series of no less than 3, following the various established orders of agreed questions.

Moments before starting the polygraph test, the subject is asked to take 2 seconds to answer each question asked by the technician, not to move, while possible gestures are observed, such as clearing the throat, sighing, breathing in, etc... and the technician must note them down in the polygraph software.

Between each series, at least a 5-minute interval is left, where the subject is asked to clarify any anomalies or behaviour that may have occurred, such as changing an answer to a question from Yes to No, or from No to Yes.
After the test is completed, the electrodes and sensors are removed in the reverse order in which they were placed.

Final Outcome and Conclusions

The polygraph test

Once the polygraph test is completed, the subject is asked to leave the room, so that the technician can assess, with the help of the software's logarithm, the subject's probability of truthfulness or untruthfulness for each question.

The polygraph technician will compare the physiological reactions obtained from the subject on the different control and relevant questions in order to determine whether the answers to the relevant questions are significantly higher or lower.

After the polygraph test, it is necessary to carry out a thorough analysis, which must also take into account the gestures and actions that the subject may have made when answering the questions.

If the results are clear, the technician meets again with the interested parties to communicate the results after payment of the service fee.

The polygraph test

The Polygraph

Polygraph test in Malaga

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The report

The communication of results is a delicate moment, as there is a great deal of expectation to know the conclusions.

The report can be oral, friendly and pedagogical, explaining in each question the likelihood of its truthfulness.

The polygraph test

The conclusions to each question should be illustrated and explained with graphs of the answers to each question.

The polygraph test report is not a fundamental requirement, but it is important to have a written record of the entire polygraph testing process and to have a record for future reference.

Other possibilities

Sometimes an interpreter may be required, as knowledge of the language and its requirements is very important in order to understand the subject, the causes, etc... Therefore, the service will require this supplement.

When the technician considers that it is necessary to carry out another type of test, such as psychological, personality or drug tests, there will also be an increase, depending on the test.

In some situations, there are several people who have to take the test, for example for a job interview, or in a case of job or family mistrust... In these cases, depending on the volume, a supplement will be set for each person to take the test.

In very exceptional situations, it may happen that the results are not entirely clear, so that it may be possible either to repeat the test, or to have to postpone the communication of results to the near future.

If at any time during the test it is perceived that the test subject deliberately attempts to manipulate the test results, the test is automatically stopped and reflected in the report, as the test subject has previously signed the test voluntarily.

Other interesting facts about the polygraph or lie detector according to Wikipedia, if you are interested in hiring our services, please do not hesitate in contact us or if you have any doubts or questions about the polygraph test.

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