When I worked in a pizza factory (I was a baller---I put the meat balls on your frozen pizzas) We had to wear lab coats and hair nets. The man the ground up the meat had a beard and he had to wear a hair net on it too. They weren't actually nets but more like surgical caps with long strings to tie to keep them in place. I won't go into what went on there but it was years and years before I could eat a frozen pizza again and still don't care much for it.