Superstar Psychic Sylvia Browne claims an accuracy rate in her "readings" of around 85%-90%. While some of her predictions are too vague to be verifiable, a lot of them are. Researchers Ryan Shaffer and Agatha Jadwiszczok itemized 115 predictions (all they could find) that Ms. Browne had made about missing persons and murder cases and then they checked to see how many of them had been accurate.
90 of the 115 are either open or unconfirmable cases. That is, there has been no disposition or evidence that would show whether Browne was right or wrong. Of the remaining 25, her predictions have proven to be wrong in…well, wait a second. Let me go back to the article and see how many of those readings turned out to be correct. Even though I don't believe in this kind of thing, you figure that just making wild guesses, a person would be right once in a while.
Okay, I just checked what these researchers wrote and according to them, the number of times Browne was right in those 25 cases is zero. Wrong every time. If you want to look for yourself, here's the link. They quote the prediction and then they cite a news source for the actual outcome.
The sad part is that this won't matter to most of the people who seek out Sylvia Browne's aid and pay her what are often large sums of money for this kind of "advice." It won't even stop Larry King from having her on his show and drumming up more customers for her.