Kolkata, Sep 13
After polygraph test, CBI has sought permission from a special court in Kolkata to conduct a narco-analysis of Sanjay Roy, the accused in the rape and murder of a junior doctor at RG Kar Medical College & Hospital here last month.
According to sources, CBI now wants to match the report of the polygraph test with that of the narco-analysis, provided they get the permission of the court for this.
There is a basic difference between polygraph test and narco-analysis: polygraph, test also popularly known as "lie detector" test measures physiological responses like blood pressure, pulse, and respiration of the person who is being questioned based on the idea that physiological responses of a person are different when they are lying.
On the other hand, narco-analysis involves injecting the person to be questioned with sodium pentothal, popularly termed “truth drug” or “truth serum,” which puts the person concerned in a stage of hypnosis which is believed to make that person speak only the truth.
None of the tests can be conducted without the consent of the person on whom they are conducted.