A person can exchange only one time 4000 to 4500 rupees notes ,now banks are not asking them if they are coming again and again but after 24 november rbi will check the IDs which people are submitting during the exchange time and if they will find that one person exchanged notes more than one times then scrutiny will be done and if a person exchanged notes more than 5 times or 4 times I don't know then income tax will inquire about them.
Black money holders also are submitting their money in jan dhan accounts and their servant's account but after 30 december government,rbi and income tax will check every account.