Essay On Polygraph Test

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It is an examination, which is only based on the “assumption” that there is an interaction between the mind and body and is conducted by various components or the sensors of polygraph machine, which are attached to the body of the accused, who is interrogated by the expert. The machine records the blood pressure, pulse rate & respiration & muscle movements. Polygraph test is conducted in three phases (a) pre-test interview, (b) chart recording (c) Diagnosis. The examiner will prepare “Questionnaire” taking the criminal charges & statements made by the suspect. Lying by a suspect is accompanied by specific perceptible physiological & behavioral changes and the sensors and a wave pattern in the graph expose this. Deviation from the baseline as …show more content…
DNA is found in all cells with a nucleus and is the same throughout the body, so virtually every fluid or tissue from a human contains some DNA and can be analyzed by DNA identification testing. DNA also is stable and does not change over time so samples collected years ago may be compared to samples collected recently. In order to use DNA profiling, it is necessary to obtain certain types of body material. The sample may be obtained by chance. In a case where the sample is obtained without coercion (blood samples, hair follicle from the defendants clothing the sample is lawfully obtained both in India and many other countries. According to this view DNA testing as such is an interference with the right to integrity of the body resulting from prior interference, caused by the taking of body materials against the suspects will. According to Supreme Court taking of body tissue from the suspect for the purpose of DNA testing is not permitted under the existing …show more content…
In this regard the fingerprint of a person is a unaccessible unit to identify a person. The fingerprints of any person are his or her own and just as two persons can not exactly alike, similarly the fingerprints of two persons cannot match in all respects .Due to in heritage nature of composition, the fingerprint of a person is sure and contains mark of identification and it cannot be tampered or changed. So the finger print evidence has its own specific importance in detection of

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