LiveScience reports "Scott Silverman, Chairman of the Board of VeriChip Corporation, has proposed implanting the company's RFID tracking tags in immigrant and guest workers. He made the statement on national television on May 16."
The VeriChip is a very small RFID (Radio Frequency Identification) tag about the size of a large grain of rice. This device can be injected directly into a person's body. It also has a special coating that helps it to bond to living tissue and not to move.
A special RFID reader broadcasts a signal into the antenna of the VeriChip. The chip uses the signal to draw its power to send back its data. This allows the VeriChip to operate without ever needing batteries.