Business And Professions Code A Liquor License Can Just Anyone Report A Contractor Working Without A Licence?

Can just anyone report a contractor working without a licence? - business and professions code a liquor license

AC is a crime for an unlicensed contractor to over $ 500 of work to do at my project. This law can be "waived by the customer. (California Business and Professions Code sections 7028 and 7048). But the question is:
Anyone can be a neighbor of the report of the owner of the contractor that the owner of a rented house (Contractor Licensing Board of the State, the local police, lawyers for the Office, the Department of Insurance, etc.), even if they (the neighbors) no evidence that they are paid more than $ 5000? When you hear and see only a few weeks of work by the contractor "and who can demonstrate that the contractor has expired license 8 years ago?