“(added 2017) Reminder: It appears likely that all recent commercial color laser printers print some kind of forensic tracking codes, not necessarily using yellow dots. This is true whether or not those codes are visible to the eye and whether or not the printer models are listed here. This also includes the printers that are listed here as not producing yellow dots.

This list is no longer being updated.”

Solution: Buy your printers secondhand at yard sales using cash. Throw them away after printing your ransom notes.