What is offender profiling?
A method of identifying the perpetrator of a crime based on analysis of the nature of the offence and the manner in which it was committed.
What is an offender profile?
Outlines the type of person likely to have committed a crime.
They are used to shorten the list of suspects.
What is a dichotomy?
Two exclusive categories; organised or disorganised.
What are the organised characteristics of a crime?
What are the likely characteristics of the offender in an organised crime?
What are the disorganised characteristics of a crime?
What are the likely characteristics of an offender in a disorganised crime?
What are the four stages in the construction of a top down profile?
1 - Data assimilation (profiler reviews evidence; crime scene, witness reports)
2 - Crime scene classification (either organised or disorganised)
3 - Crime reconstruction (hypothesis in terms of sequence of events)
4 - Profile generation (hypothesis related to the likely offender)
What are the limitations to top down profiling?
What hypothesis did Canter develop?
What is interpersonal consistency?
The theory that the behaviour of the offender at the time of the crime will be similar to everyday life.
For example, ‘overkill’ indicates a perpetrator of a violent, sexual crime is likely to be on record for domestic violence.
What is spatial consistency?
Locates the most probable location of the home of the offender from the distribution of the scenes of the crime.
It assumes criminal offences will occur in places the offender makes regular use of.
What is distance decay?
The further from the home of the offender, the fewer crimes.
What is circle hypothesis?
The majority of offender’s homes can be located within a circle, with its diameter defined by the distance between the offender’s two furthermost crimes.
What is the Marauder model?
The offender operates in close proximity to their home base.
What is the commuter model?
The offender travels from home base to a location, eg. workplace, partner’s home, and operates in a circle pattern there.
What is dragnet?
A computer package, based on Canter’s empirical research into the spatial behaviour of offenders.
It uses a series of crime locations and determines the most likely area for the perpetrator’s home.
Who is John Duffy?
- 24 sexual attacks and 3 murders in the 1980s, around railway stations across North London.
What from Canter’s profile turned out to be correct about John Duffy?
What are the strengths of Bottom-Up Offender Profiling?
What is an atavistic form?
Proposed criminals are a sub-species of genetic throwbacks that cannot conform to the rules of modern society.
Distinguishable by particular facial and cranial characteristics.
What did Lombroso investigate?
The facial and cranial characteristics of over 4,000 Italian convicts both living (90%) and dead (10%). Measurements were taken of the skulls and features of criminals; this is empirical evidence. 'Markers' - Facial asymetry - Narrow, sloping forehead - Strong, prominent jaw - High cheekbones - Dark skin - Extra toes, nipples or fingers
What did Lombroso conclude?
That criminals are genetic throwbacks with identifiable atavistic features and that specific features are associated with specific crimes:
What is the strength of the theory of the atavistic form?