Kolkata (West Bengal) [India], August 20 (ANI): The Central Bureau of Investigation (CBI) continued its investigation on Tuesday into the rape and murder of a trainee doctor at RG Kar Medical College and Hospital in Kolkata. The CBI has received permission to conduct a polygraph test on the arrested accused, CBI sources said earlier. On August 18, the CBI team examined and conducted 3D laser mapping in the emergency ward of RG Kar Medical College and Hospital in Kolkata. On Monday, the West Bengal government constituted a Special Investigation Team (SIT) to conduct an inquiry and investigation…