Forensics Flashcards
What is Offender Profiling?
A behavioural and analytical tool that is intended to help investigators accurately predict and profile the characteristics of unknown criminals
When was Offender Profiling created?
The 1970s
Where uses the Top Down Approach?
America
How does the Top Down Approach work?
- Starts with the crime scene and the evidence there
- Uses pre-established typology to assign the criminal to one of two profiles based on witness reports and evidence
Why does the Top Down Approach work?
Criminals have ways of working that correlate with psychological and social characteristics.
The characteristics allow police to categorise criminals as either organised or disorganised.
Who suggested Organised and Disorganised types of criminals?
Hazelwood and Douglas
What are some key characteristics of Organised Criminals?
- Evidence of planning - weapon taken, little evidence left, body hidden, travel away from home
- Targets the victim - they either know the victim or have a particular type of victim
- Higher than average intelligence
- Social and sexual competence - usually married or have children
What are some key characteristics of Disorganised Criminals?
- Little/no evidence of planning - weapon found at scene, frenzied attack of rage, body left, evidence left, close to home
- Lower than average intelligence
- Low/no social or sexual competence - usually live alone
How many stages do the FBI have to construct a criminal profile?
4
What are the 4 stages of FBI criminal profile construction?
1) Data assimilation
2) Crime scene classification
3) Crime reconstruction
4) Profile generation
What is data assimilation?
Analysing the evidence at the crime scene and witness reports
What is Crime Scene Classification?
Classifying the crime as organised or disorganised
What is Crime Reconstruction?
Developing hypotheses about the sequence of events
What is Profile Generation?
Developing a hypothesis about the offender
Who is an example of an organised criminal?
Ted Bundy
How is Ted Bundy an Organised criminal?
- He was highly intelligent and excelled at law school
- He was charming showing social and sexual competence
- He had a type of victim - all brunette students with a middle parting - they looked like his ex girlfriend
- He travelled across 7 states to perform his crimes
- He had a set pattern of rape and murder by beating
- He left few clues and escaped capture for a long time
Evaluate the Top Down Approach of Criminal Profiling
Good - Top down profiling can be adapted to other kinds of crime such as burglary
- Critics claimed the approach only worked for extreme or serial crimes such as rape or murder
- However, reports have shown it has been applied to burglary and has had an 85% rise in solved cases in 3 US States
- It adds 2 new categories to organised and disorganised: Interpersonal (criminal knows the person and steals a valuable item)
Opportunistic (young, inexperienced offenders)
- This suggests a wider application
Bad - Based on Flawed evidence
- FBI profiling was created based on 36 interviews with serial killers and murderers
- Canter et al argued it was a small sample size that was not randomly selected and did not include different types of crimes
- The interviews were unstructured, so there was no standardised or comparable procedure
- This could mean the top down approach is not scientific so lacks validity
Bad - It may be difficult to classify a crime as only one
- There are a variety of combinations of organised and disorganised, and killers might have contrasting characteristics such as high intelligence but leaves the body at the scene
- This suggests organised/disorganised classification is more likely to be a continuum
Where uses the Bottom Up Approach?
The UK
What are the 2 types of Offender Profiling?
Top Up Approach (USA)
Bottom Down Approach (UK)
How does the Bottom- Up Approach work?
It works up from evidence collected at the crime scene to develop hypotheses about the likely characteristics, motivation, and social background of the offender
What is Investigative Psychology?
- A form of Bottom-Up profiling that matches details from the crime scene with statistical analysis of typical offender behaviour patterns that are based on psychological theory.
- Patterns of behaviour that occur across crime scenes are used to develop a statistical database which acts as a baseline for comparison
What does Investigative Psychology include?
Interpersonal Coherence
Significance of Time and Place
Forensic Awareness
What is Interpersonal Coherence?
The way the offender behaves at the scene
What is Significance of Time and Place?
An indicator of where the criminal lives
What is Forensic Awareness?
The criminal’s ability to remove forensic evidence
What is Geographical Profiling?
A bottom up approach that is based on the theory of spatial consistency.
An offender’s operational base and possible future offences are revealed by knowing the geographical location of their previous crimes.
What is Crime Mapping?
Making inferences about the likely home or base of an offender based off the geographical location of their previous crimes.
Who proposed the ‘Circle Theory’
Canter
How many models does Canter’s Circle Theory propose?
2
What are the 2 models in Canter’s Circle Theory?
The Marauder
The Commuter
What is The Marauder
Someone who operates close to their home base
What is The Commuter
Someone who travels away from their usual residence to commit a crime
Why is it called the Circle Theory?
The pattern of previous offending usually forms a circle around the criminal’s residence/base
How does the Circle Theory become more clear?
The more crimes someone commits, the more likely we are able to determine their location. We can pair this with more knowledge of the nature of the crime to find a fitting suspect.
What happened in the case of Rachel Nickell?
She was stabbed 47 times and her 2 year old son was the only witness
A profile was drawn up which highlighted Colin Stagg as a prime suspect for matching characteristics and a dog-walking route going past where she was stabbed
For 5 months, a female police officer went undercover to pretend to date Stagg so he would confess
However, they later found Robert Napper guilty after finding new evidence. He had been removed from the case due to his height being slightly off the profile
How does the case of Rachel Nickell highlight issues with offender profiling?
It suggests that past statistics and hypotheses may be too rigid, so some key suspects may be removed from the investigation too soon.
In addition to this, vague characteristics may make someone completely innocent fit the profile perfectly
Evaluate the Bottom-Up approach to Offender Profiling
Good - Investigative Psychology has research support
- 66 Sexual Assault cases were examined using smallest space analysis
- Several behaviours were identified as common in different samples of behaviour, such as impersonal language and lack of reaction to the victim
- Each individual displayed a characteristic pattern of these behaviours which can help establish whether offences were committed by the same person
- This supports investigative psychology by demonstrating people are consistent in their behaviour
Bad - Case linkage depends on the database
- The database only includes cases that have been reported and then solved
- The recorded crimes may have only been solved as they were straightforward to link together in the first place, so it may be a circular argument
- This suggests investigative psychology may only work if there are similarities or links to past solved crimes, and if not, they will remain unsolved
- This could mean criminals are still a threat to society
Good - There is evidence support for geographical profiling
- Information was gathered from 120 murder cases involving serial killers in the US
- Smallest space analysis revealed spatial consistency in the behaviour of the killers
- The location of each body disposal site created a ‘centre of gravity’ as they aimed to travel to a different side of their residency each time to avoid 2 bodies near each other
- This helps to catch killers and reduces the area of suspects
Who came up with the Atavistic Form?
Lombroso
What is the Atavistic Form?
A biological approach to offending that suggests criminals are genetic throwbacks, or primitive subspecies that are ill-suited to conforming to the rules of modern society.
The criminal individuals can be distinguishable by particular facial and cranial characteristics
When did Lombroso write his book?
1876
What was Lombroso’s book called?
The criminal man (translated from Italian)
What were Lombroso’s main suggestions?
- Criminals were genetic throwbacks
- Criminals are a primitive subspecies and are biologically different from non-criminals
- Criminals lack evolutionary development, and their savage and untamed nature mean it is difficult for them to cope in civilised societies, so they turn to crime
- Crime is innate
What type of features are usually included in atavistic characteristics?
Cranial (skull)
Facial
What are the Cranial features of criminals?
Narrow, sloping brows
High cheekbones
Facial Asymmetry
Strong, prominent jaws
What are other physical characteristics of criminals?
Dark Skin
Extra toes, nipples or fingers
What are other characteristics of criminals?
Tattoos
Use of Slang
Unemployment
Insensitivity to pain
What are atavistic characteristics of murderers?
Bloodshot eyes
Curly hair
Long ears
What are atavistic characteristics of Sexual Deviants?
Glinting eyes
Projecting ears
Swollen, Fleshy Lips
What are atavistic characteristics of Fraudsters?
Thin and ‘Reedy’ lips
What was Lombroso’s procedure?
He examined the skulls of Italian convicts:
383 were dead
3839 were alive
What did Lombroso find?
40% of criminal acts are committed by people with atavistic characteristics
He concluded there was an atavistic form, and said the features were key indicators of criminality
Evaluate the Atavistic Form as a Biological Explanation of Offending Behaviour
Good - Contributions to Criminology
- Lombroso is called the ‘father of criminology’
- He shifted the emphasis of crime from moralistic to scientific to reduce bias
- His descriptions of criminals helped to establish Offender Profiling
Bad - Scientific Racism
- His work has racist undertones
- Many atavistic characteristics describe people with African descent - curly hair, dark skin
- His research fitted 19th century eugenic attitudes, suggesting a subjective view influenced by racist attitudes
Bad - Flawed methodology
- Lack of control as he did not use a control group
- There could be confounding variables which explain why crime rates are higher in certain societies
- e.g. crime is associated with poverty and low social class, and this could explain why he identified unemployment as one of the characteristics
- Suggests his work is not as scientific as it should have been
Bad - Causation is an issue
- Research contradicts the link between atavism and crimes
- Researchers compared 3000 offenders and 3000 non-offenders to find anything physically atypical
- They did not find distinct unusual facial or cranial features of offenders, they only suggested criminals have a lower IQ/Intelligence
- This challenges Lombroso’s suggestion of a subspecies
What are the Biological Explanations of Offending Behaviour?
Historical approach (Lombroso + atavistic form)
Genetic explanations
Neural explanations
What does the Genetic Explanation of Offending Behaviour suggest?
Offenders inherit a gene or combination of genes that predispose them to commit a crime
How is the Genetic Influence of Offending Behaviour studied?
Twin studies
Family studies
Adoption studies
Who conducted the twin study for offending behaviour?
Christiansen
Why do we use Twin Studies to test the influence of genes?
We can see the concordance rates and compare the concordance rates between MZ and DZ twins as MZ twins should have 100% concordance
What did Christiansen do?
Examined 3,500 pairs of twins in Denmark and identified the concordance rates of criminal behaviour
What were the concordance rates of Christiansen’s findings?
Male MZ - 35%
Male DZ - 13%
Female MZ - 21%
Female DZ - 8%
What did Christiansen find?
There is some concordance, and the concordance is higher for MZ twins, suggesting a degree of inheritance
HOWEVER
All concordance rates are low, indicating the environment plays a large part in criminal behaviour
The male and female differences also suggests gender could play a role
Who conducted the adoption study for offending behaviour?
Crowe
Why do we use Adoption Studies to research the influence of genes?
Adoption studies look at environmental factors by looking at children who’s parents have no genetic similarity.
It helps separate the nature and nurture factors:
Nature is dominant if a genetic behaviour is displayed
Nurture is dominant if a genetic behaviour is not displayed
What did Crowe do?
Compared a group of adopted children whose biological mother had a criminal record to a group of adopted children whose biological mother did not
What did Crowe find?
50% of the adopted children whose biological mothers had a criminal record also had one when they were 18, so regardless of environment, children related to criminals were more likely to be criminals
Who researched candidate genes for the genetic explanation of offending behaviour?
Tiihonen et al
What was Tiihonen et al’s procedure?
Conducted a genetic analysis on 900 offenders
What did Tiihonen find?
There were abnormalities in 2 of the offenders’ genes which made them 13 times more likely to have a history of violent behaviour
What were the 2 candidate genes Tiihonen found?
MAOA gene
CDH13 gene
What does the MAOA gene do?
Controls dopamine and serotonin levels in the brain
What happens to the MAOA gene in criminals?
There is low activity of this gene, leading to low serotonin
Low serotonin leads to aggression
What does low levels of serotonin lead to?
Aggression
What does the CDH13 gene do?
It controls the development and communication of neurons in the brain
What happens to the CDH13 gene in criminals?
It doesn’t function properly, leading to lack of communication and development of neurons in the brain
This is linked to substance abuse and ADHD
What is the Diathesis Stress model for offending behaviour?
A tendency towards criminal behaviour might come through the combination of a genetic predisposition (diathesis) and a psychological or environmental trigger (stressor)
Evaluate Genetic Explanations of Offending Behaviour
Good - Strong support for the Nature side of the Nature/Nurture debate
- Research into family and twin studies has suggested a genetic basis for behaviour which has implications for our understanding of offending behaviour
HOWEVER
- Supporters of the nurture side of the debate argue that ignoring the influence of important external factors such as parenting, culture and social learning means it could be considered reductionist
- It ignores crucial elements of explaining offending behaviour and only accounts for genes and biological influences
- This suggests it is a limited argument
Bad - Methodological issues with adoption studies
- Many children experience late adoption so are with their biological parents for a long time before adoption
- Lots of adoptees also maintain contact with their biological parents
- This makes it difficult to isolate and assess environmental impacts due to the influence biological parents might have had
Bad - Could be Biologically Deterministic
- The notion of a criminal gene presents a dilemma
- The legal system is based on the premise that criminals have personal, moral responsibility for their crimes, and they can only claim they were not acting on their own free will in extreme cases
- This raises an ethical question about what society does with people who are suspected of carrying criminal genes
- This could mean the concept could be socially sensitive, or it could mean that some criminals use it as an excuse for their actions: Stephen Mobley
What are the neural explanations of Offending Behaviour?
Prefrontal Cortex
Mirror Neurons
What is the suggested disorder of offenders?
Antisocial Personality Disorder
What is the Prefrontal Cortex? How does it function in offenders?
It is the part of the brain that regulates emotional behaviour
Raine found an 11% reduction in the volume of grey matter in the prefrontal cortex of people with Antisocial Personality Disorder
What are Mirror Neurons? How do they function in offenders?
Mirror neurons are neurons in the brain that control empathy
People with APD’s mirror neurons switched on when they were asked to empathise with someone one a film depicting pain
This suggests they can switch their empathy on and off unlike neurotypical people
Who came up with the Criminal personality as a Psychological Explanation of Offending Behaviour?
Eysenck
How many dimensions did Eysenck believe our behaviour could be represented across?
2
What were the original 2 dimensions Eysenck believed our behaviour could be represented across?
Introversion/Extroversion
Neuroticism/Stability
What was Eysenck’s third dimension that was added later?
Psychoticism/Sociability
What are Eysenck’s 3 dimensions of behaviour representation?
Introversion/Extroversion
Neuroticism/Stability
Psychoticism/Sociability
What basis did Eysenck believe personality has?
Biological Basis
Where does Eysenck believe our personality develops from?
From the Nervous System we inherit
What type of nervous system do extraverts have?
Under-active nervous systems so they seek excitement
What nervous system differences do neurotics have?
High levels of reactivity in the sympathetic nervous system for fight or flight
This makes them overanxious and difficult to predict