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Murder In America
The hosts pointed out that investigators found the book in Gacy's home with the insanity defense section bookmarked, suggesting he may have been familiar with the legal strategy he later employed. This observation was made while discussing the details of the arrest, trial, and execution in the episode.
Episode: EP. 88 ILLINOIS - John Wayne Gacy (PT. 3): Arrest,...
It was found in Gacy's home and had the section on insanity defense bookmarked, which showed that Gacy may have been aware of the legal strategy he would eventually use.
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When investigators searched Gacy's home back in '78, they found a book called Criminal Law and Procedure. And one of the pages that was bookmarked was the insanity defense.