The aim of this study was to document crimes and crime scene details in order to infer possible behavioural characteristics of an offender.
Canter calls this Investigative Psychology and believes:
1. Crime involves communication between 2 people; the way the offender behaves towards the victim will reveal something about the offender's dealing with people in everyday life.
2. A systematic/scientific approach is essential, which includes consideration of all available evidence, nothing should be discounted just because it "doesn't fit".
3. An offender is likely to commit crime, at least initially, in a familiar area (often called a "home-range"), this could be where the offender lives or works.
The method was a systematic data evaluation exercise in order to generate an offender profile.
Results. Canter's profile suggested a number of possible offender characteristics which allowed the police to narrow down their list and eventually catch Duffy. E.g. Some of the characteristics Canter listed were: Lives in Kilburn where the attacks occurred, need to dominate women, keeps souvenirs. Duffy lived in Kilburn, had previously attacked his wife and kept 33 house keys from his victims as souvenirs.
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