Chiro.Org Blog:

Professions, by definition, “own” their tools and their knowledge. This means that there is a cultural consensus in society that expertise in the use of professional knowledge is invested in a particular profession because that profession knows the most, is the most expert in, and can do the most good for the public with its unique tools. Lawyers know the most about laws because they make laws, study laws and apply laws. You wouldn’t go to a plumber if you had a legal case. Obviously, the situation is analogous for health care.