Offender profiling
Offender profiling means using evidence from a crime to guess the kind of person who did it, to narrow down suspects.
Top-down approach (typology)
Developed by the US FBI from interviews with serious offenders. The profiler fits the crime into a ready-made type: organised (planned, controlled, few clues, often higher intelligence and a steady job) or disorganised (unplanned, chaotic, many clues, often lives alone and nearby). Steps: data assimilation → crime scene classification → crime reconstruction → profile generation.
Bottom-up approach
Starts with data, not types. Investigative psychology uses statistics on many crimes to find patterns and interpersonal coherence (how offenders treat victims mirrors daily life). Geographical profiling uses crime locations: the circle theory says a marauder lives inside the area of his crimes, while a commuter travels out to commit them. The centre of gravity of the points is a good guess for a home base.
Evaluation: top-down is based on a small sample of extreme US offenders and the two types overlap; bottom-up is more scientific but still only narrows the search.
Biological explanations of offending
Atavistic form (historical)
In the 1870s Lombroso claimed criminals were a 'throwback' to primitive humans, with features like a heavy brow or strong jaw. His method was poor (no proper control group) and the idea carries racist bias, so it is rejected today. It matters because it moved the study of crime towards science.
Genetic and neural explanations
Twin and adoption studies suggest genes play some part. Candidate genes such as MAOA and CDH13 have been linked to violent crime. Brain studies show some offenders have less activity in the prefrontal cortex (self-control) and differences in the amygdala. The diathesis-stress model says a genetic risk only leads to crime when combined with stress such as abuse or poverty.
Psychological explanations of offending
Eysenck's theory of the criminal personality
Personality has a biological base. Offenders tend to be high in Extraversion (seek thrills, hard to condition), Neuroticism (anxious, unstable) and Psychoticism (cold, aggressive). Because they condition poorly, they learn less from punishment.
Cognitive explanations
Moral reasoning: many offenders reason at a lower stage, focusing on avoiding punishment or getting rewards. Cognitive distortions are thinking errors: hostile attribution bias (seeing neutral acts as threats) and minimalisation (playing down harm, e.g. 'I only borrowed it').
Differential association theory
Crime is learned through contact with others: attitudes, motives and techniques. The more contact with pro-crime people, the more likely a person offends. Prison can act as a 'school of crime'.
Psychodynamic explanations
A weak or overly harsh superego (conscience) may lead to crime. Early separation from a mother figure may lead to affectionless psychopathy (little guilt). These ideas are hard to test.
Custodial sentencing and recidivism
A custodial sentence means time in prison. Its aims are deterrence (put people off crime), incapacitation (protect the public), retribution (fair punishment) and rehabilitation (help people change).
Psychological effects can include stress, depression, self-harm, institutionalisation (not coping outside) and learning more crime from other inmates.
Recidivism means reoffending after punishment. In many countries a large share of released prisoners reoffend within a few years, so prison alone often fails to rehabilitate.
Behaviour modification, anger management and restorative justice
Behaviour modification in custody
Based on operant conditioning. In a token economy, good behaviour earns tokens that can be swapped for rewards like phone calls; bad behaviour loses them. It improves behaviour inside, but gains may fade after release.
Anger management
A form of CBT in three stages: cognitive preparation (spot your triggers), skill acquisition (calming, assertiveness, self-talk) and application practice (role-play). It works best for people who want to change.
Restorative justice
The offender and victim (or community) meet, with trained help. The offender hears the harm done, takes responsibility and makes amends. It focuses on repair, not punishment, can reduce reoffending and help victims heal, but needs both sides to agree.
Key formulas and definitions
- [object Object]
- [object Object]
- [object Object]
- [object Object]
- [object Object]
- [object Object]
Worked examples
1. A crime scene has no weapon left behind, the victim was carefully chosen, and there is no fingerprint. Which type of offender does the top-down approach suggest?
Step 1: no weapon left and no prints → control and planning. Step 2: chosen victim → planned. Step 3: so the profile is organised: likely above-average intelligence, socially skilled, possibly in skilled work and owns a car.
2. Burglaries occurred at points (1, 2), (3, 4), (5, 0) and (3, 2) km on a city grid. Find the centre of gravity.
x̄ = (1 + 3 + 5 + 3) ÷ 4 = 12 ÷ 4 = 3 km. ȳ = (2 + 4 + 0 + 2) ÷ 4 = 8 ÷ 4 = 2 km. The centre is (3, 2): the area to search first.
3. Of 800 people released from a prison, 360 reoffended within two years. What is the recidivism rate?
Rate = 360 ÷ 800 × 100% = 45%. Nearly half reoffended, which suggests prison alone did not rehabilitate many of them.
4. Aman says, 'He looked at me, so he wanted a fight. Anyway, I only pushed him a bit.' Name two cognitive distortions.
'He looked at me, so he wanted a fight' is hostile attribution bias: a neutral act seen as a threat. 'I only pushed him a bit' is minimalisation: making the harm seem smaller.
Common mistakes
- Thinking profiling names the offender. It only narrows down the type of person and where to look.
- Presenting Lombroso's atavistic theory as current science. It is a historical, rejected idea.
- Saying genes cause crime. Genes only raise risk, which needs stressful environments to show (diathesis-stress).
- Mixing up restorative justice with punishment. Its aim is to repair harm and take responsibility, not to make the offender suffer.