9 CFR 319.15 (a) Miscellaneous Beef Products goes on to say that

…. When beef cheek meat (trimmed beef cheeks) is used in the preparation of chopped or ground beef, the amount of such cheek meat shall be limited to 25 percent; and if in excess of natural proportions, its presence shall be declared on the label …

In the end, I’m not all that big on ground beef.  Robin Cook’s novel, Toxin, gets into how a single burger can have ingredients from a huge number of cows, and various other aspects of the stuff. A review here gives the drift:

Just when you thought it was safe to eat a hamburger again, Robin Cook–master of medical mysteries, deadly epidemics, and creepy comas–returns with an all too likely villain drawn right from current headlines: the American meat industry. If you’ve ever wondered where the E. coli bacteria comes from, and exactly how it can ravage the human body, destroying everything in its path, this is the book for you. …


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