The current rumor de jour is that the newly redesigned $20 bill has a very tiny RFID (Radio Frequency Identification) chip implanted in it. According to the urban legend, this tiny device does not have enough energy in a single bill to be detected, but if you have a large stack of the new $20's (about $1,000 worth) it can be detected by the same type of device that is used in store entrances to prevent shoplifting. Hold one of the new multicolored $20's up to the light. The only part of the bill that does not pass light is Jackson's two eyes and it appears to me that the right eye (Jackson's right) is slightly more dense. It is rumored that the RFID chip is in Jackson's right eye. It is said that if you microwave a new $20 long enough, that it will burn from Jackson's right eye outward. I would guess that this is because that is the most saturated part of the bill. But others speculate that it is due to the RFID chip. Why would the government issue a redesigned $20 bill when they redesigned the bill just a few years ago? The official answer is to combat digital scanning and forgery. But if that redesign gave law enforcement a tool to observe large stacks of bills, it would also be a motive. The $100 bill is the most commonly circulated bill outside of the US, but the $20 is the bill of choice in the US, particularly for illegal transactions associated with drugs. Of course the government has some excellant tools to follow your actions without marked bills. Every time you use a credit, debit or ATM card you are leaving a trail of your time, place and activeties. Or even better, your cell phone is constantly sending a signal out to the cell system that allows someone to triangulate your location to within a few feet.