Guidelines from the Food and Drug Administration provide an interim reference level (IRL) for lead of 2.2 micrograms. The amount of lead found in these nuggets could be as much as five times higher than this IRL for children.
A recall was not requested because the products are no longer available for purchase. However, FSIS is concerned that some product may still be in consumers’ freezers.
You ate them already. Sorry.
—Walmart



Lead can be used to cheaply increase the weight of.a product. It is also used for whitening surfaces that benefit from that. Chinese manufacturers have been caught doing both many times, I would start with tracing the origin of this chicken.