Sushant-Rhea case: Can cops book people in drug-related cases based on chats?

Three national agencies have been probing various angles in the aftermath of *Sushant Singh Rajput*'s death and the main focus of the investigation has turned to an alleged drug cartel mentioned in actress and accused *Rhea Chakraborty*'s WhatsApp chats. The question that has arisen is can chats serve as major evidence in a...