Massachusetts regulators report having caught 20 unlicensed electricians advertising their services on Craigslist. The state's Division of Professional Licensure says it conducted a sting in which it contacted electricians who advertised on Craigslist but did not include a license number and asked them to come to a home to install a light fixture or socket. When the contractors arrived, officials say they were asked by state investigators posing as the homeowners to produce license information.

For more information on the sting, visit Boston.com.