Serial killers have had a profound impact on the United States' most powerful law enforcement agency, the Federal Bureau of Investigation. Through a brief history of the FBI, the birth of the Behavioral Analysis Unit is highlighted and criminal profiling is realized as a tool to apprehend these serial killers. Four serial killer cases are presented as important representations to illustrate the contributions that were made to the FBI's investigatory procedure. As serial killings make up only one percent of the murders in the U.S.
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