Kolkata Doctor Rape-Murder: CBI to consult AIIMS to verify Sanjay Roy's sole involvement

New Delhi: The Central bureau of Investigation (CBI) will consult experts from the All India Institute of Medical Science on the DNA and forensic reports to ascertain if Sanjay Roy was the sole perpetrator or there were others involved in the brutal rape and murder of a postgraduate trainee doctor at RG Kar Medical College Hospital, Kolkata.

In order to build a watertight case, the CBI will send the reports to AIIMS to seek their opinion in the case, officials said. 

The reports will also help the agency to ascertain if Sanjay Roy was the only accused who committed the crime or there were others involved, they said.

The rape and killing of the junior doctor in a seminar hall of the hospital has sparked widespread protests.

The medic’s body with severe injury marks was found inside the seminar hall of the hospital’s chest department in the morning of August 9 by a doctor who was on round.

Following the discovery, Kolkata Police arrested Roy on August 10, after CCTV footage showed him entering the seminar hall at 4:03 AM on August 9, around the time of the alleged crime. 

Based on CCTV footage, Roy was put through extensive interrogation and the police had also noticed “recent injuries” on his left cheek, abrasion in left hand between his left and ring finger, abrasion over the back of left thigh among others showing signs of struggle, news agency PTI reported.

His biological samples like urethral swab and smear, semen, hair, nail clippings and nail scrapping were collected during the medico-legal examination, they said.

On August 13, the Calcutta High Court ordered the transfer of the investigation from Kolkata Police to the CBI, which officially began its probe on August 14. The CBI has since taken over all forensic evidence from the Kolkata Police and subjected Roy, former principal Sandip Ghosh, four doctors who were on duty with the victim, and a civic volunteer to polygraph tests to gather further leads.

The initial reports from CFSL are being analysed and corroborated with evidence to get further direction to the probe, the officials said.

A polygraph test can help in assessing inaccuracies in 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 response.

However, these are not admissible evidence during the trial and can only be used to get further leads in a case.