The CBI has sought a polygraph test on former RG Kar Medical College principal Sandip Ghosh and four other doctors in connection with the alleged rape and murder of a postgraduate trainee at the hospital, officials said. The CBI took Ghosh and four other doctors, who were on duty on the date of the incident, to a special court for seeking permission to conduct the lie detection test on them #rgkarhospitalnews #RapeandMurderCase #kolkataprotest #doctorsdeath #polygraphtest #cbi