Traditional crimes almost end. The modern society needs scientific methods of crime recognition, in case the general public go undefended. There are a number of methods for crime investigation to identify the accused and crime. Most of the techniques are founded on torture, either physical or mental. But modern techniques like Polygraph and brain–mapping test are not based on torture, we can say accused discloses all things regarding crime without giving physical pain and mentally pain. The first narco-analysis was done in the Forensic Science Laboratory, in the veerappan case by the Forensic Science Laboratory Bangalore in 2001. For conducting the test, the National Human Rights Commission has laid down certain guidelines for the conducting of this test the Narco substance should only be administered if the accused gives consent before a Magistrate. Researchers in Britain and the Netherlands also research on the result of these tests. They also found that success rate of these tests is close to 86 percent. Many European countries do not regard polygraph tests as reliable evidence. So lastly we can conclude that these tests are not reliable. Our law also permit of taking the fingerprints of accused and suspected person. So investigation agencies take fingerprints of suspected person. Explanation of Section 53 of Criminal Procedure Code 1973 clearly says that investigation Officer has power to get fingerprints of accused.