The CBI seeks permission for a polygraph test on Kolkata police assistant sub-inspector Anup Dutta, suspected of aiding accused Sanjay Roy in the rape and murder of a trainee doctor. Dutta allegedly provided favors to Roy and the CBI is investigating if he was involved in covering up the crime. The agency also conducted polygraph tests on the former principal of RG Kar medical college, Sandip Ghosh, using new technology to detect stress and cognitive cues in voice properties.
