Of course, but the main detection is still based on the density variations. The additional features like metal detection are calibrated to detect objects similar to nails, small but still much bigger than what can go through a needle. Anyways, like I said, I will keep my eyes open.
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If the vaccines contains something that is magnetic then it's fair to say that it operates in a new way that most of us don't have experience of. You are right that I don't have enough knowledge of how this all works to really know either way at this point.