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Forensic psychology addresses scientific questions about criminal actions, where the understanding of the actions leads to inferences about offender characteristics. Canter (2000) introduced the radex of criminality, the combination of quantitative and qualitative aspects of a crime. In addition, these quantitative and qualitative characteristics are viewed through the prism of development and change over time. The radex can be applied to any criminal behavior.
One of the most important investigative events of the last century was the creation of behavioral analysis units (BAUs) by the FBI. There are three BAUs. They are known not because of their ability to solve serial murders but because of their creation of a database, the Violent Criminal Apprehension Program (ViCAP), on which criminal justice professionals around the country and even the world have relied ever since.
Offender character assessment is the derivation of inferences about a criminal from evidentiary and psychological aspects of the crimes he or she has committed. For this process to move beyond deduction based on personal opinion and supposition to an evidence-based science, a number of aspects of criminal activity need to be examined, analyzed, and categorized. The notion of a hierarchy of criminal differentiation is introduced to highlight the need to search for consistencies and variations at many levels of that hierarchy. However, current research indicates that the key distinctions are those that differentiate, within classes of crime, between offences and between offenders. This also leads to the hypothesis of a circular ordering of criminal actions, analogous to the color circle, a radex.
The radex model, tested using multi-dimensional scaling (MDS) procedures, allows specific hypotheses to be developed about important constituents of criminal differentiation: