Clinical trials must report on their outcomes, irrespective their results. Doctors and their patients need all the information, not just the good news stories, to make informed decisions.
Accreditation of a school does not mean what most people think it means. In particular, it does not mean anything about the quality of education received there, or the validity of the topics studied.
In Arizona, a naturopathic institutional review board has been set up to examine the ethics of naturopathic research projects. It's going about as well as naturopathic training and practice.
Despite claims to the contrary, a naturopathic education is not comparable to that of a physician, and the biggest gap is in clinical training after classroom instruction ends.