Most facilities that I have heard of use extreme heat to kill pathogens in human waste or sewage. I believe the issue is with human, dog, or any feces of meat eating species. I definitely don't think it's a safe ingredient for sheet composting which doesn't heat. And I personally wouldn't use it even in a well-managed hot home compost system. Pathogens like E.coli can be deadly. It's not something to be taken lightly.
Before attempting this I would advise you to consult with your state extension service. My strong suspicion is that they will advise against it.
Karen
