Yet another sci-fi milestone is upon us: microchips implanted under your skin and used to identify you. The VeriChip implant. Photo: Business Week The VeriChip is the first radio-frequency identification (RFID) microchip that’s been approved by the Food and Drug Administration for use in humans. The chip is the size of a long grain of rice, and can be implanted pretty much anywhere in the body (most commonly along the tricep). Depending on how it’s used, the chip could do anything from