You raise a good point. Doesn't rendering mean that it is unfit for human consumption? I believe that these animals that are unfit for human consumption or parts of animals (fit or unfit) for human consumption are tagged as such by the USDA. The tagged items are then moved into a rendering facility. Once sent to a rendering facility, they are not fit for human consumption, no matter if the carcass was fit or unfit at the time of death.
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