Consider the new 100 dollar bills. In a nanosecond without Congress (not that they even matter any more), the 'new currency' becomes by fiat the only currency, the only legal tender, forcing the bad guys - black marketeers and drug dealers - to leave billions on the table, but also attacks any citizen who kept cash for any conceivable emergency. In the ensuing chaos, banks won't be able to offer 'conversion' without serious questions by them and their Treasury, Fed and IRS masters. No need for ATMs when you must use a government monitored credit card for all your needs and which will track the source of all you deposit.
...to leave billions on the table, but also attacks any citizen who kept cash for any conceivable emergency.
THEN when you NEED to make bank deposits to your bank, there are no ‘red flags’.
Of course if you think this will become a law, one has to start now before merchants are ordered not to accept your old 100’s.