Licensing onsite system operators does nothing.  Being licensed does not make an unethical person ethical.  It does not make an unknowledgeable person knowledgeable.   An unethical person may have their license taken away, which is rare since everyone is afraid to complain because of retaliation, and they will just hire someone and continue their business under their license.  It provides a barrier to entry that drives up costs to home and business owners.  It requires state staff to administer the program.  Licensing provides a false sense of security to homeowners.  It is a nuisance and expense to keep the license current.  I don't see practially what the program does for the industry that would not be accompished more effectively by something like Angie's list, superpages, or home advisor..  I strongly recommend ending the program as it is unnecessary.