The article has a major role in dealing with polygraph and Narco analysis in collecting the evidence and to testify the constitutional validity. From centuries there is a rapid growth in science and technology development which include sophisticated methods in replacing the third-degree torture by police and help in lie detection. It carries the function in a smooth way.  There are various scientific tools which help in the interrogation such as polygraph test, brain mapping, narco analysis and the truth serum. These tests have been recently developed to extract the information. These psychoanalytical tools are used by the investigating officers to find the truth and observe the behavior of the suspect and conclude on their observations. The main three tests such as polygraph, Narco analysis and brain mapping are called as deception detection tests. They have important role in ethical, scientific and legal implications. They are useful in revealing the information in grievous crime. Though sometimes it is crucial to detect the self-known information it can be clarified through the investigation. The study helps to arrive at the logical consequence and answering a large number of issues during the investigation. Forensic science has a vital role in detecting the crime. It is said according to Encarta world dictionary the word forensic means crime solving with application of science and to conclude on the issues arises from the crime or litigation. Forensic science is an important aspect of jurisprudence. It is a weapon in administration of justice. Forensic is the operation of the applications of science to conclude the analysis from the crime. However, sometimes they appear to be contrary to the fundamental rights of the examinees as they are subjected to pain and suffering in these tests. The procedure in which the information is extracted is also in question as they are not in their senses while divulging information in these tests.

The aim of this paper is to analyze the validity of these tests through the lenses of the constitution and determine whether they are in loggerheads with our basic fundamental rights and principles of natural justice. black.

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