A human microchip implant is an integrated circuit device or RFID tag encased in silicate glass and implanted into a human's body. Such subdermal implants can be used for information storage, including personal identification, medical history, medications, allergies, and contact information.
By implanting such a chip with a patient's medical record, hospitals and emergency workers can immediately gain access to an ill or injured person's medical history regardless of location or condition. Implanted chips are impossible to lose, which could reduce or increase the chances of information theft. Homes and automobiles could be equipped with scanners for microchips, making house and car keys obsolete (although an RFID lock requires a working power source to function). Locks and ignition switches would only work for persons with an appropriately programmed chip.
According to the FDA, implantation of the chip itself poses some health concerns. A patient could react adversely to the chip itself by infection or allergy, or it could be implanted improperly. It could dislodge itself and move to a different part of the body than where it was first implanted. The implant could also fail on its own at any time, and the information contained in it could be lost.
More serious trauma could occur if the chip reacts to outside source, such as a strong electrical field or a magnetic resonance imager (MRI) machine. The strong magnets used in an MRI scanner could destroy the implant and cause serious burns, internally and externally.
However, Mythbusters has shown that the the dangers of such an event occuring are extremely rare, with the test subject showing no signs of pain or trauma. Of course, the model and make of the chip could affect possible outcomes as well.
Veterinary and toxicology studies carried out from 1996 to 2006 found that lab mice and rats injected with microchips sometimes developed subcutaneous sarcomas. Data suggest that up to 10% of the implanted lab animals developed malignant cancers originating in the tissue surrounding the microchips. Dr. Cheryl London, a veterinarian oncologist at Ohio State University, noted: "It's much easier to cause cancer in mice than it is in people. So it may be that what you're seeing in mice represents an exaggerated phenomenon of what may occur in people." London suggested a 20-year study of chipped canines was needed "to see if you have a biological effect." Specialists from several pre-eminent cancer institutions have supported such testing before microchips are implanted on a large scale in humans.
Theoretically, a GPS-enabled chip could make it possible for individuals to be physically located by latitude, longitude, altitude, speed, and direction of movement. This could aid authorities in locating missing persons and/or fugitives and those who fled from a crime scene. VeriChip is one of the companies working on a GPS-capable chip.
A medical devices company, Calypso Medical , has developed a technology that it calls "GPS for the body" (but that is unrelated to "real" GPS, and that does not make use of signals from the GPS satellites), which is implanted into prostate cancer patients to help monitor the position of the prostate during radiation therapy.
RFID Toys: 11 Cool Projects for Home, Office and Entertainment. 4th, New York City, NY: (ExtremeTech) Ziff Davis Publishing Holdings Inc.. ISBN 0-47-177196-1.