Since the Wayne Williams case pretty much came down to fiber evidence, it's obviously open to serious challenge. Chet Dettlinger is a former assistant to the Atlanta Chief of Police. He and a group of other high-ranking ex-law-enforcement officers independently investigated the case. Dettlinger, now a Georgia attorney, was asked by Williams' defense lawyer, Al Binder, to act as a consultant, and he co-authored, The List, the only book to be published on the case. Among other problems, he saw glaring errors with the way the fiber evidence was presented.
"The 'matching' fibers were taken only from victims," he says. "Only one individual red cotton fiber was found at the Williams home — which can be found in abundance at K-Mart or Walmart — which is similar to fibers in victim Michael McIntosh's underwear. That came from the vacuum sweepings of a car, which the Williamses may or may not have owned at the time that McIntosh was murdered. Not one fiber from any victim was found anywhere near the carpet in the Williams' house.
"Insofar as the Wellman fiber is concerned, they were attempting to demonstrate how rare the fiber in the carpet in 'Wayne Williams' room' was. This ignores the fact that all of the Williamses, and any regular visitor to the home, existed in the same environment."
Dettlinger goes on to pinpoint the central errors in the prosecution's probability analysis as:



