As expert advice is progressively harder to find, people are learning to adapt to the current system and innovate new methods of legitimising art. The lack of legal precedent on this issue allows for mishaps to happen without repercussions. Seemingly, the only other conceivable solution is to develop a tool that authenticates artwork from its inception by the artist.
Source: The Enduring Problem of Art Forgery: Confronting Old Issues with New Technology – culturised