Yep they do.

In my community college we had an assignment to make a board game.

One student wanted to make a Monopoly-like game. One day police stormed the school library. That kid had tried to one-side print dollar bills.

Even though they were obviously fake representations, the presence of the dollar bills triggered alarms.

It’s driven me to believe that the reason printers aren’t open source, isn’t only because of how difficult the engineering in print heads are, but also that printers must have certain protections like these alarams in place.