We have mentioned Rob Roy before.
http://www.newagefraud.org/smf/index.php?topic=406.0He never mentions any alleged tribe, and neither does Hall.
Doctors have put out warnings on black salve.
---------
https://www.aad.org/media/news-releases/beware-of-black-salve...black salve can destroy the top layer of skin while leaving cancer behind in the deeper layers, where the disease may continue to grow.
“There is a misperception that black salve ‘draws the cancer out,’ when, in fact, it just indiscriminately damages anything it touches,” says board-certified dermatologist Mark J. Eliason, MD, FAAD, a member of the University of Utah team that conducted the research. “One of the reasons black salve treatment is so dangerous is that many users have no idea how harmful it can be.”
In interviewing black salve users for their research, the Utah team found that 74 percent of those users were unaware of the potential side effects — which include infection, extensive scarring and disfigurement — before they applied the substance to their skin. In addition to these side effects, black salve use may delay the diagnosis and treatment of skin cancer, giving the disease the opportunity to spread and become harder to remove — even life-threatening.