(White House Dossier) No, he’s not moonlighting as an agent.
Vice President Joe Biden last year earned $20,900 in rental income from the Secret Service, which is paying him to host agents on his property so they can protect him.
Most high-profile people in need of protection pay people to keep them safe. Government officials are allowed to have taxpayers pick up the tab. Biden is unique in that he actually gets paid by his bodyguards for the right to protect him.