The CBI conducted polygraph tests on former medical college principal Sandip Ghosh. | Photo: Twitter
The CBI has sought permission from a Kolkata court to conduct a polygraph test on assistant sub-inspector of the city police, Anup Dutta, who was said to be close to Sanjay Roy, the accused arrested in the rape and murder of a junior doctor at RG Kar medical college, officials said on Tuesday.
The CBI is investigating whether Dutta helped Roy cover up the crime, they said.
Dutta was reportedly involved in granting several favours to Roy, they said.
The central investigation agency is trying to find out whether Roy told Dutta about the crime and received any help, they said.
They said the court would decide on the request for a polygraph test after seeking Dutta’s consent on the issue.
The CBI completed polygraph tests on former medical college principal Sandip Ghosh on Tuesday, the third day of subjecting him to a series of Deception Detection Tests (DDT), they said.
On Saturday, he underwent a layered voice analysis test and on Monday, a polygraph test. Monday’s test could not be completed, so it was resumed on Tuesday.
Layered voice analysis is a new decryption diagnostic tool in the arsenal of forensic experts. It detects the speaker’s reaction to a lie, but does not identify it. The technology identified stress, cognitive processes and emotional signals in different properties of the voice.
Polygraph testing, also called DDT, can help assess inaccuracies in the statements of suspects and witnesses. By monitoring their psychological responses (heart rate, breathing patterns, sweating, and blood pressure), investigators can determine if there are discrepancies in their answers.
However, this is not admissible evidence during trial and can only be used to gain further leads in a case.
(Only the headline and image of this report may have been reworked by Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
First published: August 27, 2024 | 20:08 IS
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