RFID as Spy Chips?

An increasing number of marketers are apparently implanting Radio Frequency Identification Devices (RFID) into products to monitor consumer behavior after they leave stores. The tiny chips, hidden unnoticeably in the product or its packaging, can be read though your homes walls, thereby allowing marketers to know exactly when and where you are using a specific product. Marketers claim it's completely legal, while opponents refer to them as "spy chips". Check out this website to see a short animated video depicting some of RFID's current capabilities: http://www.spychips.com