My annual refresher for a "clearance" reminds me of the following:
1. In general, personal electronics are a no-no: smart watches, fitness trackers, etc.
2. Any person with an implanted medical device must be given special permission before said person is allowed in restricted/closed areas.
Surely embedded chips in the interest of "security" would make this a right mess? How could one prove that a chip from another source isn't doing covert things?
(In my opinion, even having badges with RFID is on the edge of being unacceptable in such areas. I should give up engineering and be a hard-nosed FSO instead; I don't trust anyone or any tech.)