Forensic Psychology - Offender Profilling

Offender profiling

when you make assumptions about the characteristics of an offender by a careful analysis of the offence they commit
offenders usually have a modus operandi which. an be combined with other info
it is mostly used for serious crimes like rape and murder or when standard forensic techniques have failed
profilers make assumptions of the offender such as age and gender to narrow down suspects

Top down approach overview

created by the CIA in America
approach uses pre existing categories of offender types organised and disorganised offenders
they use evidence collected from the crime since and other contextual information to fit the offender into one of the types

Top down profiling

AO1:

36 convicted murderers were interviews with 118 victims between them
from their responses 24 were classified as organised offenders and 12 disorganised offenders
Stage 1 - data assimilation : information is gathered from the crime scene eg autopsy and other information such as location
Stage 2 - crime science classification: analysis of information suggests the criminal type
organised - carefully planned, restrains were used and have average to above average intelligence
disorganised - offense is spontaneous , crime scene messy, minimal restraints used, below average intelligence
stage 3 - crime reconstruction : the sequence both the offender and victims behaviour before and after is hypothesised
stage 4 - profile generation : a range of inferences are made, such as what their gender or age is

AO3:

Strengths:

Canter et al. analysed 100 US murders committed by different serial killers
they used smaller space analysis to identify correlation between 39 behaviours eg torture and restraint
they found a distinct group of behaviour that matches the FBIs organised offender category
this supports the validity of the organised- disorganised typology suggesting organised offenders may be a distinct category

Meketa found that top-down profiling can be applied to burglary not just sexually motivated murder
the approach used the organised-disorganised distinction and added interpersonal and opportunistic categories
In 3 US states this was linked to an 85% increase in solved burglary cases
This suggest top-down profiling has wider application than originally thought

Limitations:

the FBI typology was originally based on only 36 offenders and 25 of them were serial killers
this is a small and unrepresentative sample so the findings may not apply to serial killers more generally
the classification is also based on the self-report data from convicted killers which may be unreliable because they may lie or have a poor memory
therefore the organised-disorganised distinction may lack validity meaning police could make inaccurate assumptions about an offender

Data driven approach overview:

created in the uk but David Canter
it has a more scientific approach as it uses statistical analysis on the data collected at the crime scene than in compared to previous similar crimes

Data driven profiling:

it is an evidence based approach using statistical analysis of data collected at the crime scene and information such as choice or victim and location
they get to the profile by analysing statistically and comparing it a large data set of other crimes
5 factor model
- 1. Interpersonal coherence - suggests a persons interactional style with the victim is the same with other people in their life
- 2. Time and place significance - the location chosen by the offender is significant to them. ties into their mental model of their environnent
- 3. Criminal characteristics - how the crime has been committed suggest aspects of the offenders characteristics bases on evidence from previous studies
- 4. Criminal career - how following crimes by the same offenders characteristic based on evidence from previous criminal studies
- 5. Forensic awareness - does the criminal show some knowledge of the criminal justice system and use techniques to reduce the evidence

Geographic profiling

a branch of investigative psychology focused on where the offender is likely to be based
it assumes that the location of crimes isn’t random - helps narrows down search areas
least effort principle : if there are multiple equal potential locations to commit a crime the offender will pick the one closest to home
distance decay - the number of crimes will decrease the further away form their base , but there will probably be a buffer zone around their home bases to decrease the chance of being recognised
the circle hypothesis suggest that because offenders operate according to a limited spatial midnelt crimes radiate out from their home base creating a circle

Types of offenders:

AO3

✅ Strength 1: Supporting evidence — Canter & Heritage (1990)

Analysed 66 sexual assault cases using smallest space analysis.
Found consistent patterns in offender behaviour.
This supports the idea that statistical analysis can identify behavioural patterns and link offences.
Therefore, the data-driven approach has research support.

✅ Strength 2: Scientific and objective

The approach uses statistical analysis of large amounts of crime data rather than relying on an investigator’s intuition.
This makes it more objective and systematic.
Therefore, profiles are less likely to be influenced by personal judgement or bias.

❌ Weakness 1: Case linkage can be circular

Canter & Heritage’s research relies on previously solved crimes.
These crimes may have been solved because they were already relatively easy to link.
This creates a circular argument, as the approach is being tested on cases where links may already be obvious.
Therefore, it may be less useful for unsolved crimes with fewer obvious links.

❌ Weakness 2: Geographical data may be insufficient

Ainsworth (2001) argues that geographical information alone may not be enough to create an accurate profile.
Other factors, such as timing of the offence, age and experience of the offender, are also important.
Therefore, relying heavily on statistical/geographical data may oversimplify offender behaviour…1