This interview with Jef Harvey is well worth a listen:
http://www.examiner.com/article/ufo-hunters-was-cointelpro-says-former-electronics-intelligence-operative
Apparently he believes his implant was a result of a Milab abduction or at least that the military were likely involved.
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Another important investigator of implants is Derrel Sims. I recommend his work to those looking for more information on this subject:
Check out his new book: