I just saw a show in which a modern forensics team examined evidence and got results from luminol that showed the killer had washed during the half hour it took the police to arrive. They concluded that it was indeed Lizzie that did the killing.
When someone is going to commit suicide with a handgun they usually will put the gun in their mouth, or to the temple. Not to the back of the head. This sounds like an execution.
I read somewhere that M.I.T. did a study on polygraph examinations and found them to be as accurate as tossing a coin. Newer technology may have increased the accuarcy since that study came out, but it all depends on the expertise of the polygrapher.
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