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I think so. It could have something to do with too much testosterone or a strange brain function. It could be incredibly obvious, or require some sort of reaction.
When John Wayne Gacy was executed, his family requested that scientists study his brain to see if they could figure out what caused him to be such a monster. At the time (15 years ago or so), they couldn't find anything. But with all the advances we have now, I wonder if there is something that would be noticeable.
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