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The chemical is released into the marketplace.
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It gets used in nonstick pans.
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It gets used to be sprayed on carpets
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to keep red wine from absorbing to the fiber.
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It gets sprayed on surfaces such as clothing to keep people dry
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so that the functionality has been the primary concern.
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Nobody asks the question what happens to this chemical.
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Then down the road somebody says, "Well,
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let's test blood or let's test urine or let's test body fat,
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or maybe even hair to figure out
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where this thing is going or whether or not it's there."
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And they find lo and behold, that it is there.