LUCKNOW, Sept. 17 -- The National Investigation Agency (NIA) is set to question contractual driver Adesh Choudhary on the cash trail and electronic evidence gathered in the Rs.17.29-crore counterfeit currency case at Punjab National Bank's Saharanpur currency chest, with investigators focusing on how cash was accessed, moved and allegedly substituted.

Choudhary, arrested on Wednesday, is the second key accused to be taken into custody after PNB currency chest manager Amit Kumar was arrested by the NIA on September 7. Investigators expect to examine Choudhary's role in handling cash and his alleged links with Kumar.

Sources said the agency is likely to scrutinise Choudhary's movements around the currency chest, his role in loading and un...