Kolkata doctor rape-murder: What is a ‘polygraph test’ that Sanjay Roy will be subjected to? | FULL DETAILS

Kolkata doctor rape-murder: A special court in Kolkata today (August 23) allowed the Central Bureau of Investigation (CBI) to conduct a polygraph test on Sanjay Roy, the main accused in the rape and murder of a trainee doctor at the RG Kar Medical College and Hospital.