The application of RFID in life can be said to be quite extensive, and in the future, it being used to invade the human body should not be too surprising.
In a recent patent application case by Kodak, there is a description of related applications. The surroundings of the RFID chip are protected by a special material, which can extend its survival time in the digestive organs, and it can be applied in some internal examinations. Also, it can be implanted in the knee to monitor the health of the knee, which could be a very useful monitoring device for athletes or the elderly. It can even be used in medicine, so for some patients who are resistant to drugs, they will have to confess honestly during their follow-up visits.