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 appearance; single, living alone in a location within 1 mile of the abandoned station wagon owned by one of the victims. Residence will be extremely slovenly and unkempt, and evidence of the crimes will be found at the residence. Suspect will have a history of mental illness and use of drugs. Suspect will be an unemployed loner who does not associate with either males or females and will probably spend a great deal of time in his own residence. If he resides with anyone, it will be with his parents. However, this is unlikely. Subject will have no prior military history; will be a high school or college dropout; probably suffers from one or more forms of paranoid psychosis.

The police narrowed their search to a 1-mile radius of the stolen vehi­cle, seeking a man of the suspect's description. A 27-year-old white male, 5'11 " and weighing 149 pounds, was located in an apartment complex within the same block as the aban­doned car. The man was in posses­sion of a gun that matched the murder weapon in the slayings. Also found in the apartment were numer­ous body parts thought to be animal and possibly human. The man had previously been diagnosed as a para­noid schizophrenic and had been committed to a mental facility after he was found sucking blood from a dead bird. After he had been released, he was found in the desert bloodstained and wearing a loincloth. He told police he was sacrificing to flying saucers. He was released by police; however, later a child's body was found in the same vicinity. Evidence was found in his apartment indicating his obsession with blood, mutilation, and possible cannibalism of humans and animals.

Conclusion

In summary, this research study of differences between organized and disorganized sexual murderers with regard to profile characteristics and crime scene indicators provides an important foundation for the investiga­tive technique of criminal profiling. By achieving the two study objectives, we have established that variables do exist that may be useful in a criminal profile and that do differentiate be­tween organized and disorganized sexual murderers. It is important to be aware of the limitations of this study. We do not mean to imply that all un­solved cases can be profiled successfully. We wish to emphasize that this study was exploratory and indicates that we have identified significant vari­ables in crime scene analysis.

A second important step can now be taken—that is, performing test pro­files using previously identified varia­bles and comparing results with cases which have already been profiled by BSU Agents. These test profiles would be the second phase for ad­vancing the scientific study of the pro­filing process.

Further refinement of profile char­ acteristics and deductive reasoning used by "experts" will provide an ad­vancement in the state of the art in building an "expert knowledge-based system" for law enforcement. Expert knowledge-based systems are a subset of the field of artificial intelli­gence and are derived by using knowledge and reasoning patterns of experts to create computer programs which emulate these experts. These systems are easy to use, require mini­mal training, and have English-lan­guage interface with the users. Expert systems, currently used in many fields, are continually being adapted as more knowledge is gained through their use and application. As in these other applications, expert systems will never replace skilled law enforcement representatives, but are a tool that is continually being updated by the knowledge gained through use.

FBI August 1985 / 25