Smithsonian Magazine has an article
about the Museum of Fakes, located in southern Italy. (Thanks, Joe.) It's like a real-life Museum of Hoaxes, but devoted exclusively to art fakes. Thanks to a special arrangement with the Italian police, it has become the repository for all counterfeit works of art confiscated in Italy (and there are a lot of them). Its director, Salvatore Casillo, is a sociologist who has spent 20 years studying counterfeits. My favorite detail in the article:
Casillo says that counterfeiting is a group effort involving a chain of corruption that ends at the unscrupulous seller's door. He tells of an instance when the Carabinieri went to the home of a collector to recover a fake Schifano. The owner insisted his was the real thing because the artist had been present at the purchase. As proof he showed the police a picture of himself with the painting, shaking hands with the man he identified as Schifano, who turned out to be an impersonator hired by the corrupt art gallery owner.
Related link: The Museum of Forgery
, "a virtual institute dedicated to promoting an appreciation of the aesthetics of forgery."