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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.
I'm not sure if I entirely follow. So they don't need to verify (effectively legalizing child labour), but why would that remove liability for injuries?
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.
They feign ignorance, and because the law bends to capital in the US, they get off with a tiny tiny fine.