Then officer-in-charge of Tala police station Abhijit Mondal and RG Kar Medical College and Hospital principal Sandip Ghosh were aware of civic volunteer Sanjay Roy’s unchecked movements across the hospital’s wards, CBI sources said on Wednesday.

All three are in custody now in connection with the rape and murder of the 31-year-old postgraduate trainee at RG Kar on August 9.

On a few occasions, a section of doctors had complained about Roy’s misbehaviour and the arrested police civic volunteer managed to get away with an apology, the sources said.

“There are reasons to believe that Mondal was aware of Roy’s movements across the hospital’s wards as a civic volunteer and Ghosh, too, got to know about him from a section of doctors,” said a source in the CBI.

The Sealdah court on Tuesday remanded Ghosh and Mondal in CBI custody till September 20 in response to a CBI appeal for custodial interrogation. Separate CBI teams were busy questioning the two at the CGO Complex in Salt Lake for most of Wednesday.

Officers of Kolkata Police said during the early phase of the investigation, they had found that Roy entered the hospital for the first time at 11pm on August 8 and left around 11.30pm. He went back again around 3.50am on August 9 and left around 4.30am.

Officers of the special investigation team (SIT) of Kolkata Police told CBI that Roy returned to the barracks in Salt Lake after allegedly committing the crime and dozed off. When he woke up, he was normal, the police told the CBI quoting witnesses.

A few hours later, even when he was being arrested, he showed no signs of remorse, CBI officers said referring to the statements of some of the SIT officers.

The CBI has conducted polygraph tests on Ghosh and Roy and had pressed for a narco test on the latter. The appeal was turned down after Roy refused his consent for the test.

Sources in the CBI said Mondal deliberately chose to overlook Roy’s activities in the hospital, which allegedly included arranging beds in different wards for his contacts, sometimes against payments, and following up on the status of these patients with doctors at odd hours of the day.

The police outpost inside the medical college and hospital knew that Roy would often choose specific places behind buildings for his drinking sessions but never raised their concerns, the CBI sources said.

“We are trying to find out if the OC, the former principal and a section of police personnel were part of a greater conspiracy in the rape and murder case,” an officer said.

A separate team of CBI officers questioned two doctors whose names featured in Ghosh’s call list on the morning of August 9 when the junior doctor was found dead.

Investigators wanted to know what their conversations were about that day, sources said.

Mondal suspended

Kolkata Police on Wednesday suspended Abhijit Mondal, the officer-in-charge of Tala police station. A senior officer said he was suspended in keeping with the state government’s rules.

The rule states that a government employee who has been in custody for a period exceeding 48 hours under any law providing for preventive detention or as a result of a criminal charge or otherwise, would be deemed to have been suspended, he said.

Mondal was arrested on September 14.