This technique: systematic analyses of crime scenes to give picture of offender - data driven, does not begin with fixed typologies
What are the two main methods in the BU approach?
Investigative psychology and geographical profiling
Investigative psychology
Applies statistics and theory: identify patterns across crime scenes -> develop a data base of information which can then be compared to see if the offences are linked
Investigative psychology also
Involves interpersonal coherence: way offender behaves at scene, may reflect everyday behaviour + time, place and forensic awareness (those interrogated before) is analysed
Geographical profiling, Rossmo (19970
Analysing location of linkedcrime scene -> crime mapping. Assumes serial killers will restrict their work to areas familiar with -> Jeopardy Surface (work out a centre of gravity to guess where offender might strike next)
What are Canter’s two offenders
Marauders - offenders who strike close to home
Commuters - offenders who travel
Example of the Bottom Up approach being used
David Canter assisted police in London in capturing John Duffy - the Railway Rapist (carried out 24 rapes and 3 murders).
Created a profile based on an analysis of geographical information and details of similar attacks in the past supplied by police, was surprisingly accurate.
Canter’s profile vs real info
C- lives in Kilburn, Truth - Lived in Kilburn
C - Marriage problems, T - Seperated
C - Physically small, unattractive, T- 5ft4 with acne
C - Martial artist, T - Member of martial arts club
C - Need to dominate women, T - Violent and attacked wife
C - Fantasies of rape, bondage, T - Tied up his wife before sex
