>> mara leveritt wrote "the devil's knot: the true story of the west memphis three." she questions the strength of the prosecution's case. >> they had very little to go on and to present to the jury. and so they made the decision that they were going to say this was an occult slaying and that's why it all happened, because these guys were dabbling in the occult, and they brought in an expert witness, they said, named dr. dale griffiths. and he was going to be their expert in the occult. >> dennis riordan is damien's attorney. >> this is a man who has a ph.d. from a diploma mill in california parading as an expert in this field when the fbi has looked at this and said this whole satanic thing is utterly unfounded. >> griffiths pointed out that the killings took place over a