How authentic is the lie detector test?

Judge Brett Kiwana is being asked to undergo a lie detector test

Senators read a FBI report in a room on Capitol Hill in the United States about the alleged sexual harassment of Brett Quino, a Supreme Court judge nominated by President Trump's administration.

The contents of this report have not been made public and it has been criticized that the scope of this investigation should be widened.

During the investigation, Brett was urged to undergo a polygraph test. Christine Blissford, one of the women accused of sexual harassment, gave a polygraph and turned red.

But how can accurate are polygraph tests and how are performed these tests?

What is a polygraph test? 

In short, a polygraph test records various bodywork movements in response to a question that can then be used to analyze whether someone was telling the truth or a lie.

The polygraph test usually records blood pressure, changes in breathing, or sweating on the palms.

Dr. Sophie says, "It doesn't happen in humans that if someone lies, their nose will grow as long as Pinocchio's." But lying can increase stress. The technique of catching lies can show changes in human psychology and behavior.

So this means that the polygraph test does not directly detect deception or lies but rather records the indications that this person is lying.

To reach a final conclusion about the person then use the information from the test 

How are these tests performed? 

Polygraph tests  all over the world are used but the technology and procedure are more or less the same.

Professor Don Garbin says the test is preceded by an interview that lasts about an hour.The focus of the test in this interview on the questions that need to be asked.

This test is followed by a practice in which straightforward questions are asked. This test has a purpose to give the person peace of mind so that they can understand how the test will be done.

The polygraph monitors blood pressure, changes in breathing, and sweating

All questions were agreed upon and included with a polygraph scanner.

"I did not ask any surprising questions in the test because such a question could change a person's blood pressure," said Professor Garbin. The questions asked are common to this person.

The device is equipped with devices such as blood monitor, electrodes of the fingers or palms, and two tubes on the chest and abdomen.

Says Professor Garbin: "Sometimes an object is inserted into a finger to obtain blood flow and sometimes a motion detector is inserted into a chair so that when you turn it moves slowly,

He added these machines can last only 10 to 15 minutes, but you stay in the room for at least two hours,"

During the test, the person is asked questions and their blood pressure is compared to other items during the important questions. The test concludes with another post-test discussion in which one can explain their reaction during the test.

Can you cheat? 

According to experts, yes

Professor Garbin said that there is no doubt that you can pass the polygraph exam, but you must should get training for that,

'You'll find websites that tell you how to do it, but the fact is that if you think you can go for a polygraph exam and do it, it won't happen. ۔ '

He says this requires regular exercise and regular practice with a paid examiner.

But for those who do not have a goat, what will be the procedure? “You may need to put a nail into the shoe, that is, for example, which causes joint movement or movement because you have to stand upright,” says Professor Garbin.

"The people used money kind of drugs  but they don't work," he said. However he warned that most testers will try to avoid testing.

So does it work? 

The Polygraph test began to be questioned shortly after its introduction in 1921, and the results are still debated.

Some experts say that the idea is basically wrong.

Professor Eldert Warez, who has written extensively on the subject, observes:

Washington officials conduct an initial polygraph test in 1922

"But there is no solid logic to the answer."

Dr. Van Der Zi says that because the lie detector test is a very disturbing experience, often even innocent people look guilty.

"People who have polygraph tests feel a lot of pressure," she says. So while polygraph is very good at identifying lies, it is not very good at identifying truth.

However, Professor Garbin says there are many different reasons why this test may be wrong. These reasons include questions that are poorly formulated and the interviewer misinterprets the results.

"If the tester is trained, if the test is done correctly, and if there is proper quality control, it can be between 80 and 90 per cent correct," he said.

However, according to him, interviewing the victims raises different issues.

"The victim's test is a completely different matter because whatever is asked of them, you can expect anxiety in the same way," he says. It may seem like a lie because it will involve a lot of emotion.