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You may be aware of recent media coverage on 'the Salt threat'* where the FDA is trying to regulate the food packaging industries use of salt in the products.
If they go forward with it what would stop them from trying to regulate the salt content in USDA meat since it's common knowledge that blood contains salt and if the production line is slowed down allowing for a better quality of bleed in the carcass reducing the amount salt or blood in the meat.