Micro chipping has been done for a few years now with success. A PIT tag is injected sub-q and away you go. However their are two downfalls that I've seen. One, the scanner has to be inches away from the transponder to read ( you'd have to know where the chip was implanted to make sure you not missing it ) and two, the bodies defense system might recognize it as a foreign invader and eventually push it out; Similair to a sub-q parasite. It may take some time to do, but it has happened

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