https://www.food.gov...-Processing.pdf I found this link really quick, it speaks about the EU, and as you are no longer a member I don't know if it applies, but will if exporting to an EU member country
"Other raw materials – MSM, meat containing bone fragments or skin; meat of the head with the exception of the masseters, the non-muscular part of the linea alba, bone scrapings, the muscles of the diaphragm (unless the serosa has been removed) and meat from the region of the carpus and the tarsus (i.e. small scraps derived from the joint region) is unsuitable as a raw material for minced meat production. Shins and shanks can be used."