An interesting thought that arises from a legislative change passed recently in Texas.
Texas Legislature Approves Legislation Expanding Definition of "Business of Structural Pest Control"

The Texas Senate recently passed and sent to Governor Rick Perry for his consideration legislation expanding the definition of "business of structural pest control" to include the offering to perform, advertising for or soliciting the person's performance of pest control services.

Presently, the Texas Department of Agriculture must catch an unlicensed company in the act of performing pest control services in order to take an enforcement action. The enactment of House Bill 2742 will permit the Department to cite unlicensed business that advertise or solicit pest control work.
Obviously this situation doesn't just arise in pest control. For example, how many handymen are advertising the provision of electrical contracting services without being duly licenced to carry out the work?

As far as I know, local enforcement agencies are in much the same boat - they have to catch unlicenced operators "in the act."

Is there scope for an amendment that extends to advertising and soliciting for such services here in SA?
Is there good reason not to make such an extension?