The implant Villers WOULD know about because he was there when Bond was getting the shot.
Is it just me, or is that implant basically just a meaningless gadget for which the film has no payoff? As far as I recall, Bond gets the injection and then the whole thing's forgotten about. 'Course, it may turn out useful in BOND 22, but unless I'm forgetting something it serves no real purpose in CASINO ROYALE.