In another telling anomaly of the meat-grinding business, many of the larger slaughterhouses will sell their product only to grinders who agree to not test their product for E. Coli contamination--until after it's run through a grinder with a whole bunch of other meat from other sources.. It's like demanding of a date that she have unprotected sex with four or five other guys immediately before sleeping with you--just so she can't point the finger directly at you should she later test positive for clap.
We know, for instance, that there is a direct, inverse relationship between frequency of family meals and social problems. Bluntly stated, members of families who eat together regularly are statistically less likely to stick up liquor stores, blow up meth labs, give birth to crack babies, commit suicide, or make donkey porn. If Little Timmy had just had more meatloaf, he might not have grown up to fill chest freezers with Cub Scout parts.