It's not a crime if the source is legitimate, but if you ask me to hold on to a bag of cash which your friend will retrieve tomorrow, then it's reasonable for m

It's not a crime if the source is legitimate, but if you ask me to hold on to a bag of cash which your friend will retrieve tomorrow, then it's reasonable for me to ask if the cash is legit. Otherwise, I may be harmed by being part of a crime. It's no different for a financial institution holding onto a bag of cash.