One of the key election promises Indian Prime Minister Narendra Modi made in 2014 was to track down "black money" -- cash and other assets stashed by Indians in tax havens.

Indians line up outside a bank in New Delhi to deposit and exchange discontinued bank notes on Nov. 13.
One of the key election promises Indian Prime Minister Narendra Modi made in 2014 was to track down "black money" -- cash and other assets stashed by Indians in tax havens.