forensics ao1 Flashcards
what is offender profiling
Also known as ‘criminal profiling’, a behavioural and analytical tool used by professionals to help accurately predict and profile the characteristics and traits of an unknown criminal.
aim of offender profiling
narrow the field of inquiry and the list of likely suspects. Professional profilers may be called upon to assist police officers in their investigation, usually during high profile murder cases. The methods employed may vary, but the general premise includes, careful scrutiny of the crime scene and analysis pf the evidence (including witness reports) in order to generate a hypothesis about the probable characteristics of the offender (personality, age, background, occupation, marital status etc.)
top down approach why it was made
The top-down approach was created in the United States following the work of the FBI in the 1970s. The FBIs behavioural sciences unit conducted extensive interviews with 36 sexually motivated killers such as Charles Manson, Ted Bundy.
aim of top down
The aim of these interviews was to create a database of common characteristics, patterns or trends in order to create templates for offenders. This is also known as the typology approach, where profilers who use this method will have pre-existing templates in their mind and then will match what is known about the current crime and offender and fit them to a pre-existing template that the FBI has developed.
The FBI came up with a template of two different types of offenders: organised and disorganised and this classification informs the subsequent police investigation
top down a[[roach
Profilers start with a pre-established typology (based on the interviews)
They work down from this in order to assign offenders to one of two categories, based on a signature ‘way of working’ - Modus operandi
four stages of offender profiling
data assimilation
crime scene classification
crime reconstruction
profile generation
data assimilaation
Reviewing all the information e.g. Police reports, crime scenes, photographs etc
crime scene classification
decide whether the crime is Organised and Disorganised
crime reconstruction
Make hypotheses about what happened based on victim behaviour, crime sequences.
profile generation
Present the profile hypotheses e.g. physical characteristics, behavioural habits, background, IQ etc
organised offender characteristics
vidence of planning and control with little evidence left behind. The crime appears to have a detached surgical precision.
he victim appears to be chosen or even known by the offender. The offender may have a ‘type’
ikely to have a full time job, skilled professional job. They are socially and sexually competent. Usually married and might even have kids.
Average or above average intelligence. They often follow the crime investigation.
Likely to have experienced inconsistent discipline
disorganised offender characteristics
Little evidence of planning, signs of spontaneity, evidence likely to be left behind. Spur of the moment crime.
he victim appears random. Often leave body at the crime scene.
Unlikely to have a job/ an unskilled worker. History of sexual dysfunction, failed relationships, socially awkward. Tend to live alone and close to the crime scene.
Below average intelligence
Likely to have experiences harsh discipline
bottom up approach
The profile is ‘data driven’ and emerges when the investigator rigorously scrutinises the details of the offence/crime scene.
The aim is the generate a picture of the offender – their likely characteristics. Routine behaviour, social background – through systematic analysis of evidence at the crime scene.
David Canter has attempted to move offender profiling into a more scientific and empirical domain, in comparison to the top-down approaches.
It is much more rooted in psychological theory than the top-down approach
what is investigative psychology
Applying statistical procedures, alongside psychological theory, to the analysis of crime scene evidence. The aim is to establish patterns of behaviour that are likely to occur across crime scenes. This is used to develop a statistical database which then acts as a baseline for comparison.
Details of offences can then be compared to this database to reveal important details about the offender. It can also be used to determine whether different crimes are committed by the same person.
Interpersonal consistency:
how the offender treated the victim may be characteristic of their approach to that race/culture/sexual orientation/gender. E.g. While some rapists are very aggressive and try to humiliate their victims, other may be more ‘apologetic’. This may tell the police something about how the offender related to women more generally.
Spatial consistency
the offender is likely to commit somewhere that they are comfortable in - somewhere they know well. e.g. a murder may be committed en route to a friend’s house or near their workplace.
Forensic awareness
Describes those individuals who have been the subject of police interrogation before; their behaviour may denote how mindful they are of ‘covering their tracks’.
Criminal Career:
Any past criminal experience they may have had.
Criminal Characteristics:
Controlling, quiet, nervous, polite.
geographical profiling
Geographical profiling attempts to make predictions about offenders based on information about the location and the timing of offences.
The assumption is that serial offenders will restrict their crime to geographical areas they are familiar with, and so understanding the special pattern of their behaviour provides investigators with a ‘centre of gravity’ which is likely to include the offenders base (often the middle of the spatial pattern). It may also help the investigators make educated guesses about where the offender is likely to strike next – called the ‘jeopardy surface’.
canters circle theory
Canter’s circle theory proposed two models of offender behaviour:
The marauder – those who operate in close proximity to their home base
The commuter – those who are likely to travel a distance away from their usual residence
atavistic form
activity to the fact that offenders are genetic throwbacks or a primitive sub-species ill-suited to conforming to the rules of modern society. Such individuals are distinguishable by particular facial and cranial characteristics.
lombroso
gathered empirical evidence from post-mortem examinations of criminals and took measurements of the faces of living criminals. He examined the facial and cranial featured of both living and dead, proposed that the atavistic form was associated with a number of physical anomalies which were key indicators of criminality.
In a study of 383 dead convicted Italian criminals and 3839 living ones, he found that 40% of criminal acts are committed by people with atavistic characteristics.
cranial characteristics and other characteristics of a criminal
narrow, sloping brow, strong prominent jaw, high cheekbones, facial asymmetr
dark skin, extra toes, nipples or fingers
murder characteristics
bloodshot eyes, curly hair, long ears
sexual deviant chaarteristic
glinting eyes, swollen, fleshy lips and projecting ears
fraudsters characteristics
thin and ‘reedy’ lips
twins studies
The first criminal twin study was conducted by Johannes Lange in 1930 who investigated 13 MZ and 17 DZ twins where one of the twins in each pair had served some time in prison. Lange found that 10 of the MZ twins but only 2 of the DZ twins had a co-twin who was also in prison. Lange concluded that genetic factors must play a role in offending behaviour.
In 1993, psychologist Raine found a 52% concordance rate for offender behaviour in MZ twins and only a 21% in DZ twins – again suggesting that genes do play a crucial role in determining whether someone becomes an offender or not.
Christiansen (1977) studied over 3500 twin pairs in Denmark and found concordance rates for offender behav
adoption studies
Crowe (1972) found that adopted children who had a biological parent with a criminal record had a 50% risk of having a criminal record by the age of 18, whereas adopted children whose mother didn’t have a criminal record only had a 5% risk
candidate genes
Jari Tiihonen et al (2014) carried out a genetic analysis of almost 900 offenders. They revealed abnormalities of two genes which may be associated with violent crimes including, the MAOA gene (responsible for controlling dopamine and serotonin in the brain and has been linked to aggressive behaviour) and CDH13 (that has been linked to substance abuse and attention deficit hyperactivity disorder ADHD). Within the Finnish sample, individuals with this high-risk combination were 13 times more likely to have a history of violent behaviour. However, this research is still early days – and so far, has not been replicated.
diathesis stress
If genetics do have some influence on offending, it seems likely that this is at least partly moderated or influenced by the environment.
The diathesis-stress model is applied throughout psychology including schizophrenia.
So, the likelihood of becoming a criminal may be influenced through the combination of genetic predisposition and an environmental trigger – for example, being raised in a dysfunctional environment (childhood abuse/maltreatment or having a criminal role model.
mirror neurones
special brain cells called mirror neurons distributed in several areas of the brain. Mirror neurons are unique because they fire both in response to personal action and in response to actions of other people. The neurons may be involved in social cognition, allowing us to interpret intention and emotions/empathise with others.
Recent research suggests that criminals with APD can experience empathy, but they do so more sporadically than the rest of us. Christian Keyser’s et al. (2011) found that only when criminals were asked to empathise (with a person depicted on film experiencing pain) did their empathy reaction (controlled by mirror neurons in the brain) activate. This suggests that APD individuals are not totally without empathy but may have a neural ‘switch’ that can be turned on and off, unlike the ‘normal’ brain which can always empathise