Is Your Printer Watching You? Part 2

Yahoo! News Reports that the Government Uses Color Laser Printer Technology to Track Documents:
According to experts, several printer companies quietly encode the serial number and the manufacturing code of their color laser printers and color copiers on every document those machines produce. Governments, including the United States, already use the hidden markings to track counterfeiters.
What other forms of identification technologies are built into devices that we use daily and we haven't yet discovered?

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