If the running water in the bank card is paid by bank transfer, then the whereabouts of the money can be found in the bank.

And the flow of bank cards, such as cash withdrawal, because users withdraw cash, the use of cash can not be traced by the bank, and at this time the bank can not find out the whereabouts of the money. Therefore, not all bank cards can be traced.

For ordinary users, as long as there is no suspicion of money laundering, banks generally will not monitor users' bank accounts, and naturally they will not check the whereabouts of bank water.