A team of polygraph experts from Delhi’s Central Forensic Science Laboratory (CFSL) has flown to Kolkata to conduct the tests.

Among those undergoing the lie detection tests are former RG Kar Medical College and Hospital principal Sandip Ghosh and four on-duty doctors working on the night of the incident. Sanjay Roy, the prime suspect, will likely be tested at the prison he is currently in, said CBI sources.

The agency reportedly hopes to corroborate their previous statements with the polygraph tests.

Earlier, the central agency had applied to the Sealdah court seeking permission for Roy’s polygraph test. The permission was granted on Friday and Roy also consented to the test. He was sent to jail custody on Friday.

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