Just as these killers rip open their victims to "see how they run" (as Ed Kemperput it), forensic psychiatrists and FBI agents have tried to get inside the killer's mind. Traditional explanations include childhood abuse, genetics, chemical imbalances, brain injuries, exposure to traumatic events, and perceived societal injustices. The frightening implication is that a huge
population has been exposed to one or more of these traumas. Is there some sort of lethal concoction that sets serial killers apart from the rest of the population?