Radio frequency identification (RFID) is a wireless technology that identifies objects without having either contact or sight of them. Unlike optically read technologies such bar codes, RFID tags can be read despite fog, ice, snow, paint or widely fluctuating temperatures. Additionally, RFID can identify moving objects. Data in an RFID tag is stored in an integrated circuit, and sent to the reader via an antenna. An RFID reader is essentially a radio frequency receiver controlled by a microprocessor or digital signal processor. The reader uses an attached antenna to capture the data transmitted from the tag and sends the information to a computer, where the data is processed.
Reuven R. Levary, David Thompson, Kristen Kot & Julie Brothers,
Radio Frequency Identification: Legal Aspects,
Rich. J.L. & Tech
Available at: http://scholarship.richmond.edu/jolt/vol12/iss2/3