Italian law allows only licensed tourist guides. Which means that only persons who passed an official public exam – and were tested in several subjects, such as art, history, languages, geography, touristic law – are allowed to guide tourists in a specific region.
This certification is a guarantee for you, as a proof of knowledge in the listed fields, in logistic and organizational abilities, as well as of knowledge of other countries’ people’s cultures, their exigencies, their expectations. In two words, a guarantee for professionalism.
So I would suggest to pay attention on this matter, and always to lay a claim on having a Licensed Tourist guide!