So What Did Margie Say About.....Bones: The Mystery in the Meat

The 11/22/13 Bones episode titled "The Mystery in the Meat" was based on a person having been killed, placed in a meat grinder and added to stew which was then packaged in cans and sold to several locations, one being a school.  My question is: how did such a long piece of clavicle bone survive the machine that 'ground things into uniform pieces'?  And if this were so, how could the only mark on the bone produced by a sharp instrument be from the murder weapon and not the blades of the grinder? 

I find it interesting as well that a whole eyeball would survive the process.  It would seem that such a fragile part of the human body could not maintain its shape and inner fluid through such a process.

But the one thing that flustered me was the insinuation that arterial blood spray in the hair would withstand a dozen washes and still remain.  Just ask someone who cleans crime scenes as a profession.  There must be some cleaner that will wash it all away!