When you print on a color laser printer, it's likely that you are also printing a pattern of invisible yellow dots. These marks exist to allow the printer companies and governments to track and identify you — presumably as a way to combat money counterfeiting. When one person asked his printer manufacturer about turning off the tracking dots, Secret Service agents showed up at his door several days later.
Upset? You should be!
Let's stand up to silent tracking and government bullying and send a strong message to printer manufacturers. Our privacy and our control over our own technology is far too important to give up over trumped up fears of photocopied money.