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At present days, when the legal system has so much advanced, criminals take care to erase all the evidences of their involvement, then in such case, scientific and highly sophisticated methods are required to trace the involvement of criminals. Narcoanalysis, Polygraphy and Brain Mapping tests collectively called deception detection tests (DDT) are new kinds of interrogation techniques including the DNA Test (Deoxyribonuclie Acid) which are simple and civilized way of conducting investigation. But, at the same time, one has to be conscious of its limitations also. It infringes fundamental rights under Article 20(3), and also right to privacy and right to health which are guaranteed under Article 21 of the Constitution of India.

#The revelations made during this stage are recorded both in video and audio cassettes. The report prepared by the experts is what is used in the process of collecting evidence.
A person is able to lie by using his imagination. In the Narco Analysis Test, the subject's imagination is neutralised by making him semi-conscious. In this state, it becomes difficult for him to lie and his answers would be restricted to facts he is already aware of. The subject is not in a position to speak up on his own but can answer specific and simple questions. The answers are believed to be spontaneous as a semi-conscious person is unable to manipulate the answers. Narcoanalysis is a tool which is now being, alarmingly, used by investigating agencies in criminal cases, as an interrogation technique. It was first used in 2002, in the Godhra carnage probe. During the Telgi scam, the use of narcoanalysis came under the scanner, and then it was used in the Arushi murder investigation. The scientific validity of the test has been questioned by medical professionals, and the legal validity has also been debated in several international and national cases.
The narcoanalysis is used as a tool of investigation, the procedure of narco analysis finds legal sanction under the newly amended Section 53 of the Criminal Procedure Code. In 2005, an Explanation clause was added to Section 53 of the Criminal Procedure Code, the relevant part of which reads as follows: (a) examination" shall include the examination of blood, blood stains, semen, swabs in case of sexual offences, sputum and sweat, hair samples and finger nail clippings by the use of modem and scientific techniques including DNA profiling and such other tests which the registered medical practitioner thinks necessary in a particular case; The expression 'such other tests' signifies a provision for recognizing newly developed techniques in forensic science and permitting the same in investigative procedures.
(viii) A full medical and factual narration of the manner of the information received must be taken on record.

Further, in the context of the present case, the Court is of the view that the DNA Test or Narcoanalysis Test, as prayed by the applicant, is of no relevance in the case of rape. The DNA Test can be said to be a conclusive evidence regarding rape, but the said DNA test will not conclude that the applicant had not committed rape on the victim, even the test come negative, it cannot be ruled out that the rape has not been committed, therefore there is no force in the argument of the learned counsel for the applicant and the prayer for conducting the DNA test and the Narcoanalysis test is refused.