Former R G Kar Medical College principal found 'deceptive' in polygraph test over trainee doctor's rape and murder

A Central Forensic Science Laboratory (CFSL) report indicated that Ghosh’s answers were "deceptive on certain important issues" related to the case. Although polygraph results can't be used as evidence in court, they can help gather corroborative evidence, officials told PTI. Polygraphs track psychological responses, such as heart rate and blood pressure, to identify inaccuracies in statements.