Polygraph test done to identify the truth, it is mostly done in the criminal trials. Polygraph machine record all the stress which can be measured. The lie detector is also called polygraph test because it consists altogether observe several of the suspect’s physiological purpose. Polygraph test has the capacity to identify truth by observing breathing, pulse, and galvanic skin response. There are three different types of polygraph instrument which are helpful to identify the truth; the cardio-sphygmograph, The Pneumograph, The galvanograph.
- The cardio-sphygmograph: Cardio-sphygmograph is the instrument which helps to measure the blood pressure of the person which will help to identify the truth.
- The Pneumograph: The Pneumograph instrument helps to report the respiratory system of the person.
- The Galvanograph: This instrument is attached to the finger grip to identify the truth whether he is telling lie or truth.
A polygraph test is done in the different cases like for criminal case, for employment or for the evidence and for many other cases: In a criminal case, it is done for the investigation to find out the truth. It is done for the justice to the people. There are many different kinds of crime done by the criminal; to give the justice polygraph test is the most scientific way to find out the truth. A polygraph test is actually the good policy to an extent the corruption federal investigation.
The recording instrument and question technique are only used during a part of the polygraph examination. As a person telling truth is assumed to fear control question more than the relevant question. Hibernating the heart and blood pressure rate is easy to identify the truth. If the questioning makes the suspect nervous their heart beat and blood pressure will run faster which helps the polygraph instrument to identify the truth. There are many benefits of using polygraph test which will help to secure the public from the crime.
- Doing polygraph test will help to provide the justice to the people.
- Helpful for the public to get secure from the criminal
- Able to identify the truth
- Helps to restore peace in society as it helps to figure out the criminal
- Investigation gets easier
Hope this article helps you to understand about the polygraph test and how it works and how it will be beneficial to the investigator to identify the truth which will help the environment to be safe and secure. You can know more here www.liedetector.uk