With the proliferation of radio-frequency identification technology and the recent, but increasing, use of implantable RFID chips in humans, we may already be on a path that would make such an ad commonplace in a 2017 issue of IEEE Spectrum.
The benefits would be undeniable—an implantable RFID chip, which is durable and about the size of a grain of rice, can hold or link to information about the identity, physiological characteristics, health, nationality, and security clearances of the person it’s embedded in. The proximity of your hand could start your car or unlock your front door or let an emergency room physician know you are a diabetic even if you are unconscious. Once implanted, the chip and the information it contains are always with you—you’d never lose your keys again.
Source: IEEE Spectrum - Kenneth R. Foster and Jan Jaeger