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 narcotics case?

"It is very difficult; chats are subsidiary evidence and can't be treated as main evidence. They can only be supportive. In narcotics cases, the main provision is finding drugs with the accused. The Narcotics Control Bureau (NCB) must have done a primary inquiry before registering the FIR. But if you base your case only on chats, the accused can say in court that they were having a casual chat and did not procure it," said Kishor Jadhav, who retired as DCP of the Anti Narcotics Cell. An NCB officer also acknowledged that this is the first time that they registered a case based on WhatsApp chats.