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Since the Sanitation Services Inc employed by the slaughterhouses got fined for this, Arkansas under Huckabee signed a law removing requirements to verify ages of anyone working under 16. Aka no one is liable if children are working in slaughterhouses and getting chemical burns.
Here's a picture of one of the kids.
The wording could be better, it's meant that they're not liable for hiring kids since they can say that they didn't know, are not responsible for knowing.
Yeah, that's the child labour bit. But you don't suddenly turn immune to chemical burns once you're 16, so why would they not be liable for injuries? Even if they claim their workers to be 16, somebody still got hurt. I'm not familiar with the US legal system here, so forgive my ignorance.