@WBYeats,
WBYeats wrote:has it ever been possible to show where a person has written a check?
Yes, and in some countries it is required. On cheques issued in most European countries it is required to put the place the cheque was written as well as the date. e.g. "Paris, le 10/06/2014". I suspect that this may have been the case in Britain as well at one time.
Quote:Isn't check-writing a private act that doesn't concern the bank? You do not need to inform the bank every time you write a check, do you?
Think about this for a minute. A cheque has no value until it is presented for payment by the payee. The issuing bank will necessarily know that you have written a cheque after it has been presented to the payee's bank, cashed, and returned to them.