Angel at the fence fraud

I find it difficult to believe that Oprah had another author on her show that wrote a memoir that is completely untrue. The James Frey memoir fraud was a huge story, couldn't someone have done some checking. Oprah, I am available to check sources for you. I heard yesterday it took about a week for the gentlemen who broke the story to find the truth. How did the publisher not check sources? What do you think about this latest memoir fraud?