Karishma Prakash, who had been questioned by the NCB last month too, had been asked to join the investigation on Wednesday.
Karishma Prakash's name cropped up in the interrogation of one of the arrested drug peddlers, said the official.
Acting on a tip-off, the NCB officials apprehended the actress while she was allegedly receiving ganja from a person at Machimar locality in Versova area of Andheri on Saturday.
Her name was revealed by another arrested accused to be part of drug customer network
Sawant has been accused of interacting with peddlers and procuring drugs, allegedly on behalf of Rajput, and has been charged under Narcotic Drugs Psychotropic Substances (NDPS) Act.
Agisilaos Demetriades was produced before a local court and sent to NCB custody.
The consignment was believed to be sourced from Vishakhapatnam and was on way to Madhubani.
Justice Sarang Kotwal also rejected the NCB's argument that celebrities or "role models" should get harsh treatment in such cases so as to set an example.
The duo was arrested by the Narcotics Control Bureau (NCB) in connection with a drugs probe related to actor Sushant Singh Rajput's death case last month.
Acting on a tipoff, the Central agency sleuths conducted a raid, apprehended the driver and seized the truck.
The NCB is high. On publicity. Operation Bollywood has leveraged the marijuana habit of a dead actor into a vast conspiracy by a drug cartel that supplies tinsel town stars with weed.
The four accused are now in judicial custody and further probe is on, the NCB officer said.
Prasad's lawyer Satish Maneshinde had earlier told the court that the accused was being harassed and blackmailed to make a statement against filmmaker Karan Johar by NCB officials.
Bureau already has information of party drugs flowing from Bengaluru to state
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