Legal to own human remains?

I would like to start collecting human remains due to the fact i am in the medical field (surgical pa) and have an interest in both forensic and anthropology, am i allowed to own antiques and/or artifacts of human remains from various places around the world? No i am not digging them up, they are acquired by art dealers and no not “ebay dealers”. I have learned proper techniques (and can obtain legal documentation at times) that the pieces are authentic. I plan to collect but to also use them in a book i plan to write soon. I know Native American human remains are not to be obtained, but what about other regions in the world? Mayan? South East Asian pieces? Aside from human remains, what about pieces made from animal that are considered antiques or artifacts? How can I be the legal owner of these pieces if they were purchased from an art dealer? Thank you kindly for your time.