Offender Profiling

Introduction to Forensic Psychology

  • Forensic psychology explores different explanations for criminal behavior.
  • Covers topics such as the effectiveness of prisons and alternatives to incarceration.
  • First focus: Offender profiling.

Offender Profiling

  • Definition: An investigative technique that creates a description of an offender's characteristics based on crime scene and additional data to narrow down suspects.

Main Approaches to Offender Profiling

  • Two main approaches are compared:
    • Top Down Approach: American method used by the FBI.
    • Bottom Up Approach: British alternative associated with David Cantor.

Top Down Approach

  • Description:
    • Called the top down because it starts with a preexisting typology or template prior to analyzing specific crimes.

Typologies in Top Down Approach

  • Organized and disorganized offenders:
    • Organized Offenders: Plan their crimes and leave little evidence.
    • Disorganized Offenders: Crimes display impulsiveness and leave more clues.

Historical Context

  • Origin in the 1970s by the FBI's Behavioral Science Unit in Quantico, Virginia.
  • Roy Hazelwood classified serial homicides into organized and disorganized types.
  • John Douglas and Robert Resler expanded this in the 1980s through interviews with serial sexual murderers, including infamous criminals like Ted Bundy.

Research Findings

  • Douglas and Resler interviewed 36 serial sexual murderers (7 single murderers, 29 multiple murderers).
  • Conclusion: Behavioral and personality characteristics can be derived from crime scene evidence.

Criticism of the Top Down Approach

  • Limited sample size (36 serial sexual murderers) makes it difficult to generalize findings.
  • Primarily based on interviews of American male criminals raises questions about applicability to other demographic groups.
  • Concerns regarding the reliability of self-reported data, as many profiled individuals are known for manipulation skills.

Bottom Up Approach

  • Description:
    • Does not start with pre-existing assumptions; begins with specific details of the crime.
    • Aims to build an understanding of the offender through investigative psychology.

Investigative Psychology

  • Utilizes psychological theory and statistics to analyze crime data.
  • Requires a database of criminal behavior patterns to identify similarities across different crime scenes.
  • Predictive content based on statistical analyses of past crimes.

Key Concepts in Bottom Up Approach

  • Interpersonal Coherence: Behavior in crime aligns with behavior in daily life.
    • Example: A controlling offender may also exhibit controlling behavior in other social interactions.
  • Geographical Profiling: Also known as crime mapping, uses crime scene locations
    • Assists in making inferences about the offender's residence, workplace, and social environment.
    • Example of spatial behavior: Offenders tend to commit crimes in familiar areas.

Circle Theory

  • The notion that offenders usually operate within a limited area around their homes.
  • Crimes can reveal a 'center of gravity' indicating offender's residence.
    • Offenders can be categorized as:
    • Marauders: Commit crimes close to home.
    • Commuters: Travel farther from their home base to commit offenses.

Schema Theory

  • Defined as organized units of knowledge developed through experiences.
  • Helps criminals navigate and operate effectively in their environments, including logistics of committing crimes.

Success of the Bottom Up Approach

  • Highlighted by the case of John Duffy:
    • Duffy was identified as the railway rapist who committed 24 sexual assaults and 3 murders in North London.
    • David Cantor created a profile based on geographical information that led to Duffy's arrest.
    • Duffy's profile included:
    • Living near crime scenes
    • Being a marauder
    • Marital issues
    • Physical characteristics
    • Knowledge of railways
    • Initially ranked 1505th on suspect list out of 2000, but profiling helped narrow this down significantly.

Comparative Analysis of Top Down vs. Bottom Up Approaches

  • Top Down Approach Criticisms:

    • Reliance on potentially unreliable interviews with murderers.
    • Limited sample makes it exclusive to sexually motivated crimes.

  • Bottom Up Approach Strengths:

    • Based on psychological principles, data analysis, allowing for broader applicability.
    • More scientific and objective profile generation.

Caution in Offender Profiling

  • While profiling can aid investigations, cases such as the murder of Rachel Nicholl showcase potential pitfalls.
  • Colin Stagg was misidentified as the suspect based on Paul Britton's profile, leading police to focus excessively on him.
  • Stagg was later acquitted due to police misconduct, while the real offender (Robert Napper) continued evading capture.

Conclusion on Offender Profiling

  • It is essential that profiling is used as a tool, not as the sole method for identifying suspects.
  • The need for caution due to the risks of misidentification and focusing too narrowly on profiles marketing out other potential suspects.