On 22/01/2018 17:23, charles wrote:

How does your industry tell the difference between a bill printed by the
supply company on their laser printer and on printed on the customers'
laser printer. I agree that using an ink jet is a dead give away.


With most printers it is possible to identify which printer it was
printed on including personal ones. I doubt if they perform the
necessary checks or even know you can do it.