"The classic way of solving online financial crime is to 'follow the money' - but when you can no longer do this, it is very hard to find out who is behind it,"

"The classic way of solving online financial crime is to 'follow the money' - but when you can no longer do this, it is very hard to find out who is behind it," Surely ATM's can record every note serial number issued therefore large subsequent transactions with the cash would be easy to identify.