The CBI has sought permission to conduct a narco-analysis test on Sandip Ghosh, accused in the RG Kar Hospital rape and murder case, to uncover a possible larger conspiracy.

A postgraduate trainee doctor was raped and murdered at the government-run RG Kar Medical College and Hospital last month

CBI has accused former RG Kar principal Sandip Ghosh of willfully being absent from the crime scene and tampering with evidence in a rape-murder case. Investigators suspect he was taking orders from someone else,

The CBI, which has analysed his call details, say Sandip Ghosh had spoken to Tala Police station officer in-charge and hospital officials multiple times before reaching the scene of the crime