Forensic psychology Flashcards
(109 cards)
Offender profiling
A behavioural analytical tool that is intended to help investigators accurately predict and profile the characteristics of unknown offenders.
The top-down approach
Profilers start with a pre-established typology and work down to lower levels in order to assign offenders to one of 2 categories based on witness accounts and evidence from the crime scene.
organised offender
An offender who shows evidence of planning, targets a specific victim and tends to be socially and sexually competent with higher-than-average intelligence.
Disorganised offender
An offender who shows little evidence of planning, leaves clues and tends to be socially and sexually incompetent with lower-than-average intelligence.
The top-down approach to profiling originated in the US as a result of work carried out by the FBI in the 1970s.
The FBI’s Behavioural Science Unit drew upon data gathered from in-depth interviews with 36 sexually motivated murderers including Ted Bundy and Charles Manson.
- They concluded that the data could be categorised into organised and disorganised crimes/murders.
- Each category had certain characteristics which meant that if the data from a crime scene matched some of the characteristics of one category, we could predict other characteristics that would be likely. This could then be used etc find the offender.
Organised offenders show evidence of having planned the crime in advance.
- The victim is deliberately targeted and this suggests that the killer or rapist has a ‘type’ of victim they seek out.
- The offender maintains a high degree of control during the crime and may operate with almost detached surgical precision.
- There is little evidence or clues left behind at the scene.
- They tend to be above-average intelligence, in a skilled professional occupation and are socially and sexually competent.
Disorganised offenders show little evidence of planning, suggesting that their offences may be spontaneous, spur of the moment acts.
- The crime scene tends to reflect the impulsive nature of the attack - the body is usually still at the scene and there appears to have been little control on the part of the offender.
- They tend to have a lower-than-average IQ, be un unskilled work or unemployed, and often have a history of sexual dysfunction and failed relationships.
- They tend to live alone and often relatively close to where the offence took place.
Constructing and FBI profile - there are 4 main stages:
- Data assimilation - profiler reviews the evidence
- Crime scene classification - as either organised or disorganised.
- Crime reconstruction - hypotheses in terms of sequence of events, behaviour of the victim, etc.
- Profile generation - hypotheses related to the likely offender, e.g. of demographic background, physical characteristics, behaviour etc.
One strength of the top-down approach is that there is support for a distinct organised category of offender.
Canter et al. (2004) conducted an analysis of 100 US murders each committed by a different serial killer. Smallest space analysis was used -identifies correlations across different samples of behaviour.
- The analysis was used to assess the co-occurrence of 39 aspects of serial killings (including whether there was torture or restraint, attempt to conceal body, and weapon).
- This analysis revealed that there’s a subset of features of many serial killings which matched the FBI’s typology for organised offenders.
-> FBI typology approach has some validity.
Another strength of top-down profiling is that it can be adapted to other kinds of crime, such as burglary.
Critics of top-down profiling have claimed that the techniques only applies to a limited number of crimes, such as sexually-motivated murder. However, Meketa (2017) reports that top-down profiling has recently been applied to burglary, leading to and 85% rise in solved cases in 3 US states. The detection methods retains the organised-disorganised distinction but also adds 2 new categories: interpersonal and opportunistic.
One limitation of top-down profiling is the evidence on which it is based.
FBI profiling was developed using interviews with 36 murderers in the US - 25 of which were serial killers, the other 11 being single or double murderers. At the end of the process, 24 of these individuals were classified as organised offenders and 12 were disorganised. Canter et al. have argues that the sample was poor - FBI agents didn’t select a random or even a large sample nor did the sample include different kinds of offender. There was no standard set of questions so each interview was different and therefore not really comparable.
- Suggests top-down profiling doesn’t have a sound, scientific basis.
The bottom-up approach
Profilers work up from evidence collected from the crime scene to develop hypotheses about the likely characteristics, motivations and social background of the offender.
Investigative psychology
A form of bottom-up profiling that matches details from the crime scene with statistical analysis of typical offender behaviour patterns based on psychological theory.
Geographical profiling
A form of bottom-up profiling based on the principle of spatial consistency - that an offender’s operational base and possible future offences are revealed by the geographical location of their previous crimes.
One strength for investigative psychology is that evidence supports its use.
Canter and Heritage (1990) conducted an analysis of 66 sexual assault cases. The data was examined using smallest space analysis. Several behaviours were identified as common in different samples of behaviour, e.g. use of impersonal language and lack of reaction to the victim. Each individual displayed a characteristics pattern of such behaviours and this can help establish whether 2 or more offences were committed by the same person.
- supports one of the basic principle of investigative psychology (& bottom up approach) that people are consistent in their behaviour.
Another strength is evidence to support geographical profiling.
Lundrigan and Canter (2001) collated information from 120 murder cases involving serial killers in the US. Smallest space analysis revealed spatial consistency in behaviour of killers. The location of each body disposal site created a ‘centre of gravity’ presumably because when offenders start from their home base they may go in a different direction each time they dispose of a body, but in the end all these different sites create a circular effect around the home base. The effect was more noticeable for offenders who traveled short distances (marauders).
- supports view that geographical information can be used to identify an offender.
One limitation is that geographical profiling may not be sufficient on its own.
The success of geographical profiling may be reliant on the quality of data that the police can provide. Recording a crime is not always accurate, can vary between police forces and an estimated 75% of crimes aren’t even reported to police in the first place.
- Questions the utility of an approach that relies on the accuracy of geographical data. Even if the info is correct, critics claim other factors are just as important in creating a profile, e.g. timing and age and experience of offender.
- suggests that geographical info may not always lead to successful capture of an offender.
Atavistic form
A biological approach to offending that attributes criminal activity to the fact that offenders are genetic throwbacks or a primitive subspecies ill-suited to conforming to the rules of modern society. Such individuals are distinguishable by particular facial and cranial characteristics.
!876 - Lombroso wrote a book called ‘the criminal man’ in which he suggested that criminals are ‘genetic throwbacks’ -
a primitive subspecies who were biologically different from non-criminals.
- Today, Lombroso’s theory of atavistic form would best be described as speculative and naive.
Offenders were seen by Lombroso as lacking evolutionary development, their savage and untamed nature meant that…
they would find it impossible to adjust to the demands of civilised society and inevitably turn to crime.
- Lombroso saw offending behaviour as a natural tendency, rooted in genes of those who engage in it.
In terms of cranial (skull) characteristics, the atavistic form included…
narrow, sloping brow, a strong permanent jaw, high cheekbones and facial asymmetry.
- Other physical markers included dark skin and the existence of extra toes, nipples or fingers.
Besides physical traits, Lombroso suggested there were other aspects of the born offender including…
insensitivity to paint, use of slang, tattoos and unemployment.
Lombroso went on to categorise particular types of offender in terms of physical and facial characteristics; Murders and sexual deviants.
Murderers - bloodshot eyes, curly hair and long ears
Sexual deviants - glinting eyes, swollen, fleshy lips and projecting ears
One strength of Lombroso’s work is it changed the face of the study of crime.
He has been names the ‘father of modern criminology’. He also shifted the emphasis in crime research away from a moralistic discourse towards a more scientific position (evolutionary influences and genetics where individuals aren’t to blame).
- Influenced offender profiling as he was trying to describe how particular types of people are likely commit particular types of crime.