In a lot of places its not illegal to own real human remains. As long as there's strict adherence to the laws that allow it. Some examples being that it's not recovered from protected lands or originating from a crime, ongoing investigation and so on. I'd suggest looking into the subject. It can be quite interesting considering a lot of cultures include practices that involve human remains.
As for the subject surrounding the supernatural I am typically a skeptic. I've grown incredibly non-theistic since my early childhood and have found that I am very tired of "supernatural" explanations surrounding the science behind how our world and bodies work. Its easy to pass things off as something unexplainable but given the time and age we live in, most things we use and do now would of had us burned at the stake in the 1700-1800s. Thanks to science we can now explain many things that would have been considered "paranormal" back then. Advances in mental health being a big one. Does this mean I don't believe? Not necessarily. I believe that YOU believe you saw something. I can't prove anyone's experience, and in most cases neither can they aside from a retelling of the experience.
Of course there is a bunch of stuff we don't know and I think a healthy amount of skepticism is needed to be able to dig deeper and still be able to maintain a focus on the reality. Not to be "disappointed" so to speak. I think as humans we tend to give support to a supernatural cause because we want there to be something on the other side. In our seemingly boundless quest for knowledge its absolutely understandable that the subject of some form of existence after this life is sought after. Proof be damned, some insist that there really is something. Because of that I will always ask: "What if there isn't?"
Interestingly enough there are actual legal cases where ghosts have been involved. Including one finding where a ghost aided in convicting their own suspected murderer. Check out Legal Eagle's recent video about it!
https://www.youtube.com/watch?v=NyoEDpY_uyM