RG Kar Medical College's ex-principal Sandip Ghosh gave 'deceptive' answers during polygraph, claims CBI

Kolkata doctor case: CBI has alleged that Sandip Ghosh got information about the rape and murder of the trainee doctor at 9.58 a.m. on August 9 but he did not make the police complaint immediately.

RG Kar Medical College's former principal Sandip Ghosh was found to be "deceptive" while answering important questions on the rape and murder of a trainee woman postgraduate doctor during his polygraph test and layered voice analysis, officials said.

The CBI, probing the case, arrested Ghosh on September 2 in connection with financial irregularities at the hospital. The federal probe agency later added charges of evidence tampering against him.

During the investigation, Ghosh was subjected to layered voice analysis and polygraph test.

According to a report from Central Forensic Science Laboratory (CFSL), New Delhi, his version has been found to be "deceptive on certain important issues" relating to this case, officials in the know of the developments said.

Information revealed during the polygraph test may not be used as evidence during the trial but the agency may gather corroborative evidence which could be used in court, they said.

Also read | Former R.G. Kar hospital principal had criminal nexus with co-accused for wrongful gains: CBI

A polygraph test can help in assessing 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.