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Originally posted by Sam60
If they can't see it, it's not there.
You don't need to worry that you might have an implant.
Current research in the NIH/NINDS Neural Prosthesis Project (NPP) has led to the development of implantable sensors and probes (Professors Troyk, Najafi, Banks etc., PI on NIH NPP contracts) that are just below the size of feature detection in typical clinical radiology (MRI/CT etc). Continuing research on animal models and a select few human cases show that these probes can not be imaged and the only means of examination is a histological method after the research subject dies with no in-vivo examination due to the sub-millimeter size.