I work for a meat company here in wisconsin, and the only meat that should me washed is meat with bones in it. like bone in pork chops, t-bones, bone in ribeye.... and that is because when the meat is being cut on the bandsaw you get alot of bone dust on the meat. most meat plants will scrap off as much as possible but hardly get it all off. and custom slaughter plants just cut the meat and package it up with out scrapping any off. so I hope this answers your questions... But it would not hurt to wash all your chicken parts off just to be sure...
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