It depends on what the implant is suppose to do.
I think that certain pedophiles or certain risks to the public should be chipped with a locator device of some nature.
But I know that's not the purpose of implant-chips - nor would it be useful seeing as how one would just locate it and likely cut it out, anyway. And how would it actually serve to assist the public in order to ensure safety? You'd have to give everyone a wand and permission to randomly check.
So it's really a moot thought of mine.