That’s not really how RFID technology like this works.
It probably would be used more to prosecute people who deal illegally in prescription drugs. So, when the police catch a criminal with prescription drugs, they scan them and can look up who was originally prescribed those drugs, and go arrest them.
“The CMU proposal is not without precedent — two years ago, the U.S. Food and Drug Administration approved an ingestible radio ID tag. Designed by California’s Proteus Digital Health in partnership with Oracle Health Sciences, the sensors are meant to track whether a patient has actually taken the medicine, and they also may be able to communicate vitals information, such as heart rate, to the radio readers. Others have proposed using edible RFID tags in foods to track their calorie content. “
Read the article. Technology like this is certainly being used to track people, effectively spying on them. Can it have positive applications, like assisting in prosecuting those who traffic illegal drugs? Sure, but it also has the potential for very serious & dangerous abuses, the kind that conservatives should be vehemently opposed to.