From the Tin-Foil Hat Department

Printers from many popular manufacturers are secretly encoding "the date and time your document was printed, as well as the serial number of the printer", according to the EFF. The article says, "The Secret Service maintains that it only uses the information for criminal counterfeit investigations. However, there are no laws to prevent the government from abusing this information... it shows how the government and private industry make backroom deals to weaken our privacy by compromising everyday equipment like printers." Good point.