Many believe that a lie detector is a huge leap forward in the study of psychology and crime detection. People are sure that only a professional criminal can deceive this device, but just think - regardless of whether the detector showed a lie or not, its results are not considered in court. And why? Because the device is not accurate, it makes mistakes and it is not so difficult to deceive it.
If a lie detector can make a mistake and be deceived, then why is everyone so afraid of it and believe in its infallibility? All thanks to PR. A lie detector is well-advertised all over the world, so many people spend a lot of money to use this unit.
Many people can mislead a lie detector, for example, social psychopaths can easily mislead this device. Social norms seem different to a social psychopath, so this person may think that he did everything right and didn’t break anything. Also, teenagers or older people can deceive a lie detector; they can answer a question without fully understanding it.
Good actors can also easily trick the detector, because if a person strongly believes in his lie, he will begin to evaluate it as truth. If a person is not an actor, not a child and not an old man, and is also not psychologically ill, then he can also deceive a lie detector. He just needs to practice a bit in a lie.
Several ways to trick a lie detector: you can just have a little drink in the evening before the session. In this case, in the morning the person’s reactions will be slowed down, which will confuse the device. You can also use some sedative, which will reduce the amount of adrenaline produced in the blood.
You can deceive the detector thanks to the complete control of your emotions. To do this, you need to focus all your attention on something outsider, in which case the person begins to respond to the machine. This method actually works, but it is very unsafe - for the inspector can notice the detachment and remove the person from this state.