The CBI on Thursday conducted polygraph tests on two private guards employed at Kolkata's RG Kar Medical College and Hospital, where a trainee postgraduate doctor was allegedly raped and killed on August 9, officials said.
The guards were produced before a Kolkata court on Thursday for getting their consent for the tests and after getting the court's nod, the tests were concluded by the evening, they said.
The total number of individuals put through polygraph tests in the case is now 10, including arrested accused Sanjay Roy, former principal of the medical college Sandip Ghosh, Assistant Sub-Inspector (ASI) of the Kolkata Police Anup Dutta, four doctors who were on duty with the victim on the fateful night, and a civic volunteer of the Kolkata Police, to get further leads about the crime.
The information revealed during the polygraph tests might not be used as evidence during the trial but the Central Bureau of Investigation (CBI) might gather corroborative evidence that could be used in court, the officials said.
A polygraph test can help assess inaccuracies in the statements of suspects and witnesses. By monitoring their psychological responses, heart rate, breathing pattern, sweating and blood pressure, investigators can determine if there are discrepancies in their responses.
The trainee doctor was allegedly raped and killed in a seminar hall of the hospital, where she had gone to rest during her graveyard shift in the early hours of August 9.
Her body with severe injury marks was found inside the hall by a doctor who was on rounds.
Roy was arrested the next day on the basis of CCTV footage, in which he was seen entering the seminar hall at 4:03 am on the day of the incident.
On August 13, the Calcutta High Court ordered the probe to be transferred from the Kolkata Police to the CBI, which took over the case on August 14.
The incident has triggered nationwide protests.
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