Kolkata doctor rape-murder: What is a polygraph test and how it can solve puzzle pieces of RG Kar hospital horror

CBI has been granted consent for polygraph tests on Sandip Ghosh, a former principal of RG Kar Medical College, and four colleagues. They aim to probe the 22-minute interval between two critical calls related to the victim’s death. Although polygraph results need formal consent and are not court-admissible, they could provide key insights.