The role of Rhea's brother Showik and his purported links with the people nabbed by the NCB are under the scanner of the agency and he and Rajput's manager Samuel Miranda are expected to be summoned for questioning soon, the officials said.
The two have been charged under multiple sections of the anti-narcotics law and will be produced in a court on Saturday, sources said.
Agency sleuths claimed he was arrested after they obtained some "vital leads" into the narcotics case registered against Rajput's live-partner Rhea Chakraborty and others.
Rajput's manager Samuel Miranda and cook Dipesh Sawant used to collect the contraband and make `joints' (marijuana cigarettes) for the deceased actor, a NCB officer claimed.
Commenting on the Narcotics Control Bureau investigation of a drug case, related to actor Sushant Singh Rajput's death case, Raut said, "The probe of the case started about murder and suicide. Now, narcotics came into the case. Nobody knows where will it go. It is under NCB's jurisdiction to summon anyone to join the probe."
This is her second attempt to seek release after a magistrate court on Tuesday refused to grant her bail. In the fresh plea, filed by her lawyer Satish Maneshinde, the 28-year-old actress claimed to be 'innocent'.
Showik is brother of the main accused in the case, Rhea Chakraborty, while Miranda was house manager of the deceased actor.
'She came yesterday, she came today... we talked to her all day, questioned her. So, I cannot say she is not cooperating. She will come tomorrow too. 'So we are getting her cooperation,' NCB deputy director general (DDG) (south-west region) Mutha Ashok Jain told reporters after the questioning session.
NCB Deputy Director General (south-west region) Mutha Ashok Jain told reporters outside the agency's office later that Rhea will be called again on Monday for questioning and recording of her statement like Sunday.
'The investigation is at preliminary stage, therefore, from the available record, it can not be said that there are no reasonable grounds to connect the accused (Rhea) (to the case),' the court observed. The court also said there is possibility of the accused tampering with evidence if released on bail.