The Argument That Licensing Would "Professionalize the Practice" Has No

The argument that licensing would "professionalize the practice" has no legal basis because:

A) Controversy is not sufficient cause to regulate a practice
B) Licensing cannot be imposed simply for the benefit of an occupational group
C) There simply is no valid and reliable way to test those entering the practice
D) It is not constitutional to impose educational requirements and testing
E) The Tenth Amendment forbids regulation of occupations and admission to practice