Bharti, who is also a lawyer but doesn't represent Sisodia before the court, said CBI did not seek further custody for interrogation because they may have nothing to prove against him.
The case pertains to the transfer of land to the Yadav family for government jobs during Lalu’s tenure as the railway minister between 2004 and 2009.
Zargar was released along with JeM chief Masood Azhar in exchange for passengers of the hijacked Indian Airlines flight 814 (IC 814) at Kandahar in 1999.
The team will hold a meeting with Dubai's investigating agency to get information on the terror funding network of Dawood's gang.
NIA crackdown targets the nexus between foreign-based Khalistani terrorists and criminals based out of India.