Wheather the polygraph lie detection technique is correct or not.

     

  

           People wonder if lie detection technique helps to find out truth. So here is simple answer, basically lie detection technique is related to our blood pressure, respiration rate and breath rate. So if a criminal is expert in controlling his expressions then he beat the lie detector. So what does needs to do. First thing he must be confident while giving the answer of the question. Second thing is that he should not think about crime in which he is involved while conducting detection text.
           If a person acts confident and tries to think about some other issue when question is being answered then he can certainly bit the questioner.
          So the conclusion is that polygraph test is not always correct.                                           
         In 1999 the polygraph test  was introduced  by the United State of America in  the pre-employment  of employees in the agencies that are related to national security  of U.S. such as police department ,F.B.I and even in C .I. A  for security purpose. In that test about 1,300 employees was not in very satisfied condition.So the the controversy related to this  lie detector test  always remain until the scientist will reach the last aspect of human being .....