What is a printing test?

Also known as the "Lies Detector Test", the Polygraph test is not something of the films. Polygraphs are a common part of crimes investigations and background controls. More and more companies, especially government bodies, now require these tests from potential employees.

is a simple machine that consists of six sensors or "conductors" that are connected to a person performing a test. The examiner, known as a forensic psychophysiologist (FP), observes a leaf of moving paper and the type of lines drawn on it with a special pen. These lines vary according to the emotional reaction of the subject to questions and these signals are recorded on paper.

Despite what the name suggests, the printing test does not detect lies, but rather evaluates the physical reactions of the subject to a number of questions. To this end, it evaluates the heart rate of the subject, respiratory frequency, blood pressure and sweating at hand. Sometimes polygraph also evaluates involuntary movements of arms and legs and nerve tics that are often detected during difficultquestions. In general, when a person lies, his heart rate increases, he begins to sweat and his entire body reacts. This is what the test is measuring.

Before starting the printing test, an examiner and a person who tests the test, they will pass a "preliminary interview". During this time, the examiner explains how the test works and check the questions to be asked. In the case of legal questions, a lawyer is usually present at this stage. During the real test, the examiner asks a combination of irrelevant questions, such as "What is your name?", And questions that are directly related to the problem tested.

There are many controversies around the lie detector tests, because anyone can learn to cheat is the right training and preparation. While the results of the Polygraph test can be used in court, many organizations are now fighting to cancel practice because it cannot be 100% accurate.