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If we have metals like iron and zinc in our blood, why doesn't that set off metal detectors?

Is it too small an amount of metal? Or is it because it's tiny particles of it instead of a big chunk?
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Longpatrol · 31-35, M
Minute traces. Metal detectors aren’t Magneto
BlueMetalChick · 26-30, F
@Longpatrol I figured it was probably something along those lines.
iMystery · M
@Longpatrol Yeah but not even Magneto could control humans despite the metals present lol