Lie detector tests underway in high-profile Kolkata trainee doctor murder case

The lie detector test on Sanjay Roy, the prime suspect in the alleged rape and murder of a junior doctor of RG Kar Medical College, is underway at Kolkata's Presidency Jail, officials said on Sunday.

Two more people are scheduled to undergo the test at the CBI office in Kolkata. On Saturday, four people, including former director Sandip Ghosh, were subjected to similar tests, officials revealed.

The CBI has sought permission from the court to conduct polygraph tests on seven individuals, including Roy and Ghosh. While the polygraph test results are not admissible as evidence, they provide an investigative direction to the agency.

A specialized team from the Central Forensic Science Laboratory in Delhi is carrying out the tests.

Roy was arrested on August 10, a day after the doctor's body was found in the seminar room of the medical college. CCTV footage and a Bluetooth device located near the body implicated Roy, who was allegedly seen at the crime scene around 4 am. Roy, a trained boxer and civic volunteer with the Kolkata police, has denied the allegations.

The CBI informed the Supreme Court that the crime scene had been tampered with when it took over the investigation, suggesting that the local police tried to cover up the case. The Calcutta High Court transferred the case to the CBI on August 13 and the investigation began on August 14.

(With contributions from agencies.)