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Mainly, linkage analysis is used when physical evidence, such as DNA, cannot be collected.
Labuschagne states that in gathering and incorporating these aspects of the offender's crime pattern, investigators must engage in five assessment procedures: obtaining data from multiple sources, reviewing the data and identifying significant features of each crime across the series, classifying the significant features as either modus operandi or ritualistic, comparing the combination of modus operandi and ritual or fantasy-based features across the series to determine if a signature exists, and compiling a written report highlighting the findings.
There are three leading approaches in the area of offender profiling: the criminal investigative approach, the clinical practitioner approach, and the scientific statistical approach.
The criminal investigative approach is what is used law enforcement and more specifically by the Behavioral Analysis Unit (BAU) within the FBI.
Profiling techniques existed as early as the Middle Ages, with the inquisitors trying to "profile" heretics.
An offender's signature is the unique similarities in each of the kills.
Langer, James Brussel, Howard Teten, Robert Keppel, Richard Walter, John Douglas, Robert Ressler, and David Canter.