Forensic Psychology

Offender Profiling: The Top-Down Approach

• Definition of Offender Profiling:

  • Also known as criminal investigative analysis.

  • A set of techniques used to narrow down the characteristics of an unknown offender based on crime scene evidence.

  • The primary aim is to provide investigators with a psychological and demographic picture of the likely suspect.

• Origins of the Top-Down Approach:

  • Developed by the $FBI$ Behavioral Science Unit in the $1970s\text{--}80s$.

  • Key figures involved: Robert Ressler and John Douglas.

  • The framework was based on interviews with $36$ convicted sexually motivated serial murderers.

  • Methodology: The profiler starts with an existing typology and applies it "top-down" to the new crime scene.

• The Organised vs. Disorganised Typology:

  • Organised Offenders:

    • Plan offences in advance and bring weapons/kits to the crime scene.

    • Target strangers who fit a specific victim type.

    • Conceal or move the body and clean up the scene.

    • Demographics: Typically above-average $IQ$, employed, socially competent, and in a stable relationship.

  • Disorganised Offenders:

    • Characterized by little or no planning; actions are opportunistic and spontaneous.

    • Victims are often random or known to the offender.

    • The body is left at the scene; weapons are abandoned; no attempt is made to conceal evidence.

    • Demographics: Typically below-average $IQ$, unemployed, socially isolated, and may live near the crime scene.

• Key Study: Ressler et al. ($1988$):

  • Aim: To develop a typology of serial murderers from direct offender interviews.

  • Procedure: Interviews were conducted with $36$ convicted sexually motivated murderers (all male) in $US$ prisons. Semi-structured interviews were supplemented by prison records and case files.

  • Findings: Two categories emerged. Organised offenders had a mean $IQ$ of $113$ and showed evidence of premeditation. Disorganised offenders had a mean $IQ$ of $92$ and exhibited chaotic crime scenes.

  • Conclusion: Crime scene evidence can generate reliable inferences about offender characteristics, supporting the utility of top-down profiling.

• The Four-Stage Profiling Process:

  1. Data Assimilation: Collect all available information, including photographs, witness statements, and pathology reports.

  2. Crime Scene Classification: Classify the scene as either organised or disorganised.

  3. Crime Reconstruction: Reconstruct the sequence of events and hypothesize the motive.

  4. Profile Generation: Produce a description of the likely offender’s demographics and traits.

• Evaluation of the Top-Down Approach (AO3):

  • Limitation (Canter et al., $2004$): An analysis of $100$ $US$ murder cases found that $93\%$ of organised crime scene behaviors were also present in disorganised scenes, suggesting the two types are not empirically distinct. This undermines the validity of the organised/disorganised dichotomy.

  • Limitation (Small Sample Size): The typology is based on only $36$ offenders—all male and based in the $US$—who provided self-report data. This limits generalisability ($GRAVE$ concern) to female offenders or other cultural contexts.

  • Strength (Case Evidence): The profile of the "Mad Bomber" (James Brussel, $1956$) correctly predicted numerous characteristics. These cases provide some real-world validity and actionable investigative intelligence.

  • Limitation (Subjectivity): The approach relies on investigator intuition rather than standardized procedures. Two profilers may reach different conclusions, indicating poor inter-rater reliability.

  • Limitation (Oversimplification): The introduction of a "mixed" category offers little discriminative guidance to investigators.

  • Limitation (Specificity): Developed for sexually motivated serial murder; its ecological validity for common offences like robbery or fraud is questionable.

Offender Profiling: The Bottom-Up Approach

• Overview:

  • Developed in the $UK$ primarily by David Canter.

  • It is a data-driven approach that starts with specific crime scene and victim data and works upward to inferences about the offender using statistical analysis.

• Investigative Psychology (Canter):

  • Applies psychological theory and research methods to criminal investigation.

  • Key Assumptions:

    • Interpersonal Coherence: The way an offender treats their victim mirrors how they relate to people in daily life.

    • Significance of Time and Place: Offence locations reveal information about the offender’s home base (anchor point) or daily routine.

    • Forensic Awareness: Steps taken to avoid leaving evidence (e.g., wearing gloves) indicate prior experience of the criminal justice system.

• Key Study: Canter and Heritage ($1990$):

  • Aim: To identify consistent behavioral patterns across a series of stranger rapes.

  • Procedure: $66$ sexual assault cases were analyzed using smallest space analysis (a statistical technique).

  • Findings: Five core behavioral variables were identified (including personal style of address and impersonal sexual behavior) that co-occurred reliably across offences.

  • Conclusion: Offenders show behavioral consistency, supporting the principle of interpersonal coherence.

• Geographical Profiling (Rossmo):

  • Generates a probability map of where the offender likely lives or works based on spatial patterns.

  • Core Principles:

    1. Least Effort Principle: Offenders commit crimes close to home to exert minimum effort.

    2. Distance Decay: The likelihood of offending decreases as distance from the home base (anchor point) increases.

    3. Circle Hypothesis: Crimes fall within a circle defined by the two most geographically distant offences.

  • Travel Patterns:

    • Marauders: Operate from a fixed home base and radiate outward.

    • Commuters: Travel away from their home area to commit crimes elsewhere.

• Key Study: Lundrigan and Canter ($2001$):

  • Aim: To test if the geographical patterns of serial murderers could predict their home base.

  • Procedure: Disposal sites of $120$ murders committed by $46$ $US$ serial killers were analyzed.

  • Findings: Home addresses were consistently located near the center of gravity of the disposal sites.

  • Conclusion: Serial killers show spatial consistency; the circle hypothesis was supported.

• Evaluation of the Bottom-Up Approach (AO3):

  • Strength (Scientific Credibility): Uses objective statistical methods (smallest space analysis). Methodology is more replicable than the top-down method.

  • Strength (Real-World Validation): The John Duffy ("Railway Rapist") case saw Canter correctly predict $13$ of $17$ characteristics of the suspect.

  • Limitation (Database Quality): Depends entirely on the quality and completeness of crime database records; incomplete data produce unreliable outputs.

  • Limitation (Theoretical Foundation): Some research suggests offenders behave differently during offences than in normal social contexts, challenging interpersonal coherence.

  • Strength (Broad Application): Unlike top-down, it can be applied to robbery, burglary, or arson, not just serial murder.

  • Application: Geographical profiling software like $Rigel$ is used by police forces in North America, Europe, and Australasia.

Biological Explanations of Offending

• The Atavistic Form (Lombroso, $1876$):

  • Argument: Criminals are evolutionary throwbacks or biological "atavisms" ill-adapted to modern society.

  • Physical Stigmata: Protruding jaw and cheekbones, low sloping forehead, handle-shaped ears, long arms, insensitivity to pain, and dark skin.

  • Threshold: Five or more stigmata marked a "born criminal."

  • Feature Links: Murderers (cold glassy eyes); sex offenders (thick lips).

• Key Study: Goring ($1913$):

  • Aim: To test Lombroso’s claims.

  • Procedure: Physical and mental characteristics of $3,000$ English convicts were compared against a large non-criminal control sample.

  • Findings: No evidence for physical stigmata as distinguishing features. Convicts tended to score lower on intelligence.

• Genetic Explanations:

  • The $MAOA$ Gene: Produces an enzyme that breaks down serotonin, dopamine, and noradrenaline.

  • $MAOA\text{-}L$ Variant: The "low activity" variant leading to a neurotransmitter build-up (specifically serotonin), associated with impaired impulse control and aggression.

  • Key Study: Brunner et al. ($1993$): Analyzed a Dutch family with a history of violence. Affected males showed a complete absence of $MAOA$ enzyme activity due to a mutation on the $X$ chromosome.

  • Twin Study: Christiansen ($1977$): Studied $3,500+$ twin pairs in Denmark. Concordance rates for criminal behavior were $35\%$ for $MZ$ twins versus $13\%$ for $DZ$ twins.

• Neural Explanations:

  • Prefrontal Cortex (PFC): Responsible for executive functioning. Reduced activity impairs impulse inhibition and moral reasoning.

  • Amygdala: Processes threat and fear. Reduced reactivity is linked to psychopathic traits; hyperreactivity is linked to impulsive aggression.

  • Mirror Neurons: Neural basis of empathy; deficits are linked to antisocial personality disorder.

  • Key Study: Raine et al. ($1997$): PET scans of $41$ $NGRI$ (Not Guilty by Reason of Insanity) murderers and $41$ controls. Findings showed significantly reduced activity in the lateral and medial $PFC$ and orbitofrontal cortex.

• Evaluation of Biological Explanations (AO3):

  • Limitation (Falsification): Goring ($1913$) falsified the atavistic form, reducing it to a historical artifact.

  • Strength (Concordance): Christiansen ($1977$) supports a heritable component, though the $35\%$ rate suggests a diathesis-stress model rather than pure genetic determinism.

  • Limitation (Generalisability): Raine et al. ($1997$) used an atypical $NGRI$ subgroup; findings may reflect comorbid mental illness rather than generic violence.

  • Limitation (Determinism): Biological explanations challenge the concept of free will and moral culpability, which has already been used in mitigation in $US$ capital cases.

  • Limitation (Racism): Lombroso’s stigmata overlap with features of non-European ethnic groups, historically justifying eugenics.

Psychological Explanations of Offending

• Eysenck's Criminal Personality ($1964$):

  • Personality is biologically rooted and measured on three dimensions:

    1. Extraversion (E): Under-aroused cortex; seeks stimulation; fails to internalize social rules due to poor conditionability.

    2. Neuroticism (N): Reactive autonomic nervous system; strong emotional responses to threat/frustration.

    3. Psychoticism (P): Aggressive, cold, lacking empathy.

  • Measurement: The Eysenck Personality Questionnaire ($EPQ$).

• Cognitive Explanations:

  • Moral Reasoning (Kohlberg): Offenders function at the pre-conventional level.

    • Stage $1$: Avoid punishment.

    • Stage $2$: Pursue personal gain.

  • Cognitive Distortions:

    1. Hostile Attribution Bias: Interpreting ambiguous cues (like a bump) as deliberate hostile intent.

    2. Minimalisation: Downplaying the severity of an offence to reduce guilt (e.g., "they deserved it").

  • Study: Samenow ($1984$): Identified patterns of grandiosity, entitlement, and a victim stance in offenders.

• Differential Association Theory (Sutherland, $1939$):

  • Criminal behavior is learned through social interaction with intimate groups.

  • Individuals become criminal when exposed to more definitions favorable to law violation than unfavorable.

  • Variables: Frequency, duration, priority, and intensity of pro-criminal associations.

• Psychodynamic Explanations:

  • Superego Dysfunction:

    1. Weak Superego: Failure to identify with same-sex parent; $Id$ impulses go unchecked.

    2. Deviant Superego: Interalization of a parent’s deviant values.

    3. Harsh Superego: Commits crimes to seek punishment for unconscious guilt.

  • Bowlby ($1944$): Maternal deprivation during the critical period leads to "affectionless psychopathy."

    • Study: $44$ juvenile thieves. $14$ were affectionless psychopaths; $12$ of those $14$ ($86\%$) had experienced early maternal deprivation.

• Evaluation of Psychological Explanations (AO3):

  • Limitation (Eysenck): Heaven ($1996$) found the relationship between Extraversion and offending is particularly weak.

  • Limitation (Bowlby): Subject to researcher bias and confounding variables like poverty.

  • Strength (Cognitive): Distortions are measurable with tools like $PICTS$, allowing for targeted interventions like the Enhanced Thinking Skills ($ETS$) programme.

  • Limitation (Psychodynamic): Concepts like the superego are unfalsifiable and lack empirical testing.

  • Strength (Differential Association): Explains white-collar crime and corporate fraud, which biological theories cannot easy account for.

Dealing with Offending Behaviour

• Aims of Custodial Sentencing:

  • Retribution: Proportionate punishment for justice.

  • Deterrence: Preventing reoffending (individual) and discouraging the public (general).

  • Incapacitation: Physical removal from society.

  • Rehabilitation: Changing behavior and skills for future reintegration.

  • Vindication of the Law: Demonstrating rules are enforced.

• Psychological Effects of Custody:

  • Institutionalisation: Loss of autonomy and self-directed behavior.

  • Brutalisation: The "school for crime"; $70\%$ reoffending rate for young offenders within $2$ years.

  • Mental Health: High prevalence of depression and anxiety; reference to Zimbardo’s Stanford Prison Experiment.

  • Recidivism: Approximately $70\%$ for young offenders in the $UK$.

• Behaviour Modification (Token Economies):

  • Based on operant conditioning.

  • Tokens (secondary reinforcers) are given for pro-social behavior and exchanged for privileges (primary reinforcers).

  • Study: Hobbs and Holt ($1976$): Token economy in a youth detention center significantly increased pro-social behavior compared to a control unit.

• Anger Management:

  • Three Stages:

    1. Cognitive Preparation: Identifying personal anger triggers and patterns.

    2. Skills Acquisition: Learning relaxation and assertiveness techniques.

    3. Application Practice: Structured role play.

  • Study: Ireland ($2004$): $92\%$ of participants showed improvement on at least one measure of reduced aggression.

• Restorative Justice:

  • Focuses on reconciliation. Offender meets the victim to hear the impact of their crime.

  • Study: Sherman and Strang ($2007$): Systematic review found lower recidivism and higher victim satisfaction compared to traditional criminal justice, especially for personal/violent crimes.

• Evaluation of Dealing with Offending (AO3):

  • Limitation (Recidivism): High rates ($70\%$) suggest prison often fails as deterrence or rehabilitation.

  • Limitation (Token Economy): Low ecological validity; reinforcement systems do not exist outside prison.

  • Limitation (Anger Management): Subjective officer ratings in studies like Ireland ($2004$) may involve demand characteristics.

  • Strength (Restorative Justice): The dual benefit for victims and offenders makes a compelling case for expansion, though session formats vary widely.

  • Comparison: Scandinavian systems prioritize rehabilitation over retribution and see markedly lower recidivism rates.