In 2005, the EFF exposed information that printers secretly encode with a pattern of dots on every printed page. Now, according to Seeing Yellow (via BoingBoing), when someone complained to their printer manufacturer about this practice, "Secret Service agents showed up at his door several days later."

Seeing Yellow, part of the MIT Media Lab, wants citizens to contact their printer manufacturers, to make it clear to the printer companies and to the Secret Service that violating users' privacy is not appreciated. Companies telling government agencies when individual citizens oppose their policies is a bad precedent and, whether yellow dots are a big deal or not, we should not tolerate government agents investigating our opinions about printer technology.