In the Journal of Southern History, http://karws.gso.uri.edu/JFK/the_critics/wrone/Review_of_Case_Closed.html, the reviewer writes,
"He claims to have refuted the critics, purports to show what actually occurred, and asserts simple factual answers to explain complex problems that have plagued the subject for years. In the process he condemns all who do not agree with the official conclusions as theories driven by conjectures. At the same time his book is so theory driven, so rife with speculation, and so frequently unable to conform his text with the factual content in his sources that it stands as one of the stellar instances of irresponsible publishing on the subject. Massive numbers of factual errors suffuse the book, which make it a veritable minefield ... Posner often presents the opposite of what the evidence says."
Also in US News and World Report, "With all the hoopla, the reader might get the impression that Posner has not only achieved some major breakthroughs in the case, but that he's actually solved it. Unfortunately, nothing could be further from the truth."
Or Reviews in American History, "Based on, and misled by, perverse secondary sources - notably Gerald Posner's 'Case Closed'."
In fact in Chapter 11 of 'An Act of State: The Execution of Martin Luther King' William Pepper deals conclusively with Posner's work and reveals that Posner never interviewed James Earl Ray nor most of the seventy witnesses that testified in the 1999 trial in Memphis. At that trial the jury found that Ray had not killed King and that a conspiracy involving the FBI and the military was responsible.