Forensic Psychology Advanced Info Flashcards
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What is offender profiling
-Investigative tool used by police and solving crimes
-based on offenders modus operandi (way their commit crime)
-is combined with info about crime scene and victim
-used for serial offenders
-used when other
forensic techniques haven’t worked
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What is the top down approach (typologies, who created it)
- American approach
- Created by FBI
- Based on in depth interviews of 36 sexually motivated serial killers, examples include ted Bundy
- Created two typologies: Organised and disorganised offenders
- Organised offenders: Little clues left behind, high intelligence, socially and sexually competent, plan the crime (transport them, kill them, bury them in different places)
- Disorganised: don’t plan crime, average IQ, unskilled work, live alone, leave clues at crime scene like blood, fingerprint.
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What are the stages of the offender profiling in top down approach
Six main stages (Douglas et al)
- Profiling inputs: Data collection, evidence, weapon, information about victims and
- Decision process models; Murder type, time and location
- Crime assessment: what type of offenders
- Criminal profile: hypothesis of background, habits, beliefs, physical characterises, behaviour strategy to catch offender
- Crime assessment: written report given to investigative agency like police
- criminal apprehended:
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Is the top down method useful?
- Police believe FBI methods are useful
- Copson et al asked 184 police officers and 82% said technique
- 90% said they would use it again
- this shows how effective this method is
- moreover, Scherer and jarvis: said we should look the potential contributions beyond identification
- for example approach offers investigators a different perspective and this may prevent wrongful conviction
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A limitation of the top down approach is that it is based on outdated personality models
- Typologies based on classification system
- assumes that offenders have the same pattern of behaviour and motivations
- Alison et al says that it is outdated and that is it driven by stable dispositional traits not changing circumstances
- likely to have poor validity
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Unable to distinguish between organised and disorganised offenders
- Turvey says that it’s more likely to be a continuum than than two distinct typologies
- supported by fact that descriptions are generalisations at best
- Douglas suggested that having a third typology called mixed offender may solve this issue
- Canter also analysed 39 aspects of serial killers in murders committed by 100 serial killers
- Canter found that there was no clear division between organised and disorganised killers
- also found subsets of organised crimes but none for disorganised
- suggests this method may be limited to certain crimes
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Potential harm caused by profilers
Snook et al argued
- the top down analysis is not based in science or theory
- why we believe profiles may be due to the barmnum affect which is when ambiguous descriptions can be made to fit any situations
- so if we had a list of 20 characteristics 10 will almost be correct, hence why they are right
- A consequence of this is that
- Jackson and Bekerin suggest smart offenders can read how profile are constructed and can deliberately mislead profilers by leaving misleading clues
- so should profiling techniques be made available to the public
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What is investigative psychology
- developed by David Canter
- suggest profiling should be based on psychological research and theory
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What are the three main features of the bottom up approach
Interpersonal coherence
- people are consistent in their behaviour so there are correlation with crime and daily life (for example if they are aggressive with victim, aggressive with others in real life)
- the way people interact with victim and crime scenes
Forensic awareness
-certain behaviours may reveal awareness of police techniques
Davies et al found rapists who conceal fingerprints often had conviction for burglary
Space analysis
- statical technique
- allows data from other crime scenes to be put together so common characteristics are identified
- acts as a baseline
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What is geographical profiling
- uses information about location of linked crimes to make inferences about the home or base of offender
- this is known as space mapping
- based on theory of spatial consistency (people commit crimes within a limited geographical area
Canters circle theory
-said most offenders have a spatial mindset
-Marauder: offenders home within geographical area were crimes are committed
Commuter: offender travels to geographical area and commits crimes
-police can use criminal geographic targeting developed by Rossmo to find out more about the offender
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An advantage of the bottom up approach it is scientific
- more scientific than top down approach because of use of stats techniques and computer analysis
- however some techniques will
- data collected tells us about offenders who’ve been caught not about patterns of behaviour related to unsolved crimes
- Moroever computer programming involves someone developing a formula, this can be wrong at times
- Although it has the potential to be scientific and systemic, in practise it is biased.
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What is the supporting evidence for geographical profiling
Lundrigan and Canter
- collected information on 120 murders involving serial killers
- Small space analysis revealed spatial consistency
- location of body disposal site created centre of gravity
- more noticeable effects for marauders
- suggest geographical information can be used to identify an offender
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Is circle theory successful
Canter and Larkin
-showed support for model by distinguishing between marauders and commuters when studying 45 sexual assaults
-But 91% were marauders (so is classification useful)
Petherick
-found number of flaws with model
-so if person home is not at the centre then police may look in the wrong place
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Case study
- Evidence has shown that bottom up profiling can work in identifying offenders (railway rapist)
- however some of it is flawed liek geographical profiling can’t distinguish between multiple offenders in same area as method is linked to spatial behaviour and not personality
- Moreover in the case if Rachel Nickell, a psychologist led the police to create a profile that led to arresting the wrong man
- they actual offender was ruled out because he was too tall
- so although the bottom up approach has real world applications the approach may cause more harm than good
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What is Eysenck theory of personality
Developed three dimensions
-Extroversion- introversion (extraverts are outgoing, have positive emotions but get bored easily)
- Neurotosism and stability (tendency to experience negative emotions such as anger anxiety)
- psychoticsm and normality (psychotics are egocentric, aggressive, impersonal, not concerned about other people)
To test this he created the Eysenck personality questionnaire
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What is the biological basis according to Eysenck
-suggest each trait has biological basis and claimed 67% variance for traits due to genetic factors
Extraversion: gave underactive nervous system, seek excitement, stimulation and likely to engage and risk taking behaviours. Don’t condition easily so don’t learn from mistakes
Neurotic: high levels of reactivity to sympathetic nervous system, respond quickly to situations of threat, tend to be nervous and jumpy, behaviour difficult to predict
Psychotic: have higher levels of test role, are unemotional and prone to aggression
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What is the criminal personality
Type is
Neurotic- extrovert- psychotic