I’m a printer and I have people ask me once in a while how hard is it to counterfeit? I ask them who are they trying to fool?
I was looking at purchasing a ‘huge’ networked laser copier a few years ago and the tech told me that there is software in it to recognize if money was copied - after the third attempt, the machine calls the FBI.
Not sure if this is urban legend, but thought it interesting...
It wouldn’t surprise me a bit if copy machines can call the FBI. Fifteen years ago I attempted to copy the cover of a piece of sheet music from the 1910s on a color copier. There was a pen-and-ink drawing on the cover, with lots of cross-hatch shading in it. The machine produced nothing but black sheets of paper. I was able to make copies by adding something like 20% to the size of the copies.