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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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Jentlemen · 46-50, M
I dunno but my dick attracts girls who like heavy metal
Longpatrol · 31-35, M
Jentlemen · 46-50, M
@Longpatrol must be some magnetism
Longpatrol · 31-35, M
@Jentlemen I think it’s like on the Dis-co-very Channel
Jentlemen · 46-50, M
@Longpatrol nah, but I think I saw my dick on Animal Planet. It was on a horse