The witness has been provided protection by the Mumbai police in the wake of revelations he made in his application.
Kaur is facing three cases that include charges of attempt to murder and extortion. She is a member of the Mazdoor Adhikar Sangathan and a resident of Giadarh village in Punjab's Muktsar district.
The Narcotics Control Bureau's deputy director general, northern region, Gyaneshwar Singh, who is heading the departmental vigilance probe into allegations of extortion in the drugs-on-cruise case, arrived at the agency's office in Mumbai on Wednesday.
It is suspected that detection of alleged irregularities in a fisheries project led to the incident.
The other three people chargesheeted are Arif Abubakar Shaikh, Shabbir Abubakar Shaikh and Mohammad Salim Qureshi --- all residents of Mumbai.
