How Lie Detector Works and Its Use

In some situations where the police or other parties are involved, a person needs to be looked at in a special way to determine if what they say is true. It can’t be done by guessing or guessing if you want valid results or if what you say is not a lie. But you need a special “lie detector” tool to do that.

A lie detector or lie detector is a polygraph measuring device that can track how a person’s heart rate, blood pressure, breathing, and skin conductivity change when asked a question and then answered.

History says that the lie detector was first made in 1902 and is still being updated to make it more modern. Since 1924, when the police investigated and questioned people, they have used lie detectors to find out if they are telling the truth.

A piece of graph paper shows the results of a lie detector test. The lie detector test itself takes about an hour and a half.

Most people still don’t know how lie detectors are used or how they work because this thing can’t be sold on the market and is only used by a few people.

Here’s an explanation of how a lie detector or a lie detector works.

How Lie Detector Works and Its Use

As we’ve already discussed, the lie detector uses important body parts like the heart rate, breathing, and skin response. For this, the body needs to be connected to a number of sensors that can tell if any of the body’s three parts are changing strangely.

The person who was going to take the lie test was put in a room where they could be questioned. Only the examiner (a forensic psychophysiologist) and the person being tested can be in the room.

Later, the person being tested must sit in a special chair. Then, sensors that are linked together by wires are attached to the body. A person being tested has three sensors attached to their body, which are:

  • A pneumograph sensor is a sensor that is attached to the chest and abdomen and is used to measure the rhythm of breathing. The sensor will work as long as there is air in the body and the muscles are moving.
  • The Blood Pressure Cuff sensor is a device that measures changes in blood pressure and heart rate. This sensor is attached to the arm, and the heartbeat or blood flow can be used to find it.
  • This sensor is used to see and measure how much sweat is on the hands. The cabled-together sensor will be attached to the fingers. So, if the person is lying, it will be easy to tell by how much sweat their skin makes.

After these sensors are attached to the body of the person being tested, the examiner will ask several questions about the topic, issue, or case with which the person being tested is having trouble.

The lie detector makes a graph showing whether the answer is true. The graph shows if the answer is true or not. The graph can look like a straight line or go up and down. The graph shows if the person is telling the truth or if they are lying.

Up to 90% of the time, the test results from the lie detector are correct. This shows that a tool for finding out if someone is telling the truth when they say something works very well.

But lie detectors are still debated, especially by psychologists. This is because there is no way to measure how much someone lies with physical or nonphysical tools.

This is backed up by the journal Federal Practitioner, which says that the results of a lie detector can be wrong if the person has an autonomic disorder or is taking certain drugs.

This is what you need to know about how a lie detector works. We hope that the above information can help.