Rahul Mahajan will be produced in the Tis Hazari court on Monday for the hearing of his bail application and a production warrant by Delhi Police to take him for further questioning.
The police had moved an application in the court on Saturday after the investigation teams that visited Mumbai and Srinagar had gathered "vital clues" against Rahul.
"We have some vital clues against him and want to question him further," said a senior official on Sunday.
In Mumbai, the police questioned some friends of Rahul and went to the places he frequented. They said Mumbai Police had provided more details linked to the case.
Rahul was arrested on June 5 after he was taken seriously ill following a June 1 drug-laced drinks party at the official residence of the late Mahajan.
He has been remanded in judicial custody till June 22.
Vivek Moitra, an aide to the senior Mahajan, died due to suspected drug overdose at the June 1 party.
Forensic reports of Rahul and Vivek Moitra have confirmed use of narcotics substances.
{{/usCountry}}Forensic reports of Rahul and Vivek Moitra have confirmed use of narcotics substances.
{{/usCountry}}Police also said they had "vital clues" against Sahil Zarru, a Kashmiri youth suspected to have procured drugs for the party.