Forensics Flashcards
(40 cards)
Crime
This is an act committed in violation of the law where the consequences of the conviction by court is punishment
Offender profiling
An analytic tool that is intended to help investigators accurately predict and describe the characteristics of unknown criminality.
The main stages in top-down process
Douglas:
-Profiling inputs: data collected from scene of the crime, detailes of the crime such as weapon used.
-Decision profile models: data is organised into patterns, based on the murder type, time factors and location factors.
-Typology: determines whether they are organised or disorganised
-Criminal profile: constructed to include hypotheses about the offenders, such as background, to work out a strategy to catch offender and how they would respond to investgative methods.
-Crime assessment: persons who match role are evaluated and if not return to stage 2
-Apprehension: entire profile is reviewed to check each stage and conclusions for legitimacy which can be beneficial for future cause
Top down originated in the USA from data gathered from in depth interviews conducted by the FBT’s Behavioural Science Unit found after interviewing 36 sexually system which informs the subsequent police investigation
Evaluate top down approach
Top-down Profiling assumes that personality is fixed and unchanging.
Alison refers to recent research on personality suggesting that personality types are fluid and are subject to change. Godwin has said that offenders may display characteristics from both categories.
If an offender’s behaviour and personality changed or they are incorrectly profiled then they may be eliminated as a suspect due to the original profile.
This is a weakness as fixed typologies may be too rigid to accurately profile the real offender.
Typologies of organised and Disorganised cannot be applied to mundane crimes.
This is because the extreme nature of rapes and murders reveal details about the personality and motivations of the killer.
This cannot be said for more routine crimes such as littering, speeding and fraud where the crime scenes are less likely to reveal information about the offender.
This is a weakness as the top-down profiling approach can only be used for violent, sexual crimes and not more common offenders.
Evidence does not support the Disorganised offender.
Canter used the smallest space analysis of 100 US Offenders using 39 characteristics related to organised and Disorganised offenders. They found evidence of consistent offending but not Disorganised offending,
This undermined the binary and exclusive classification system as a whole.
What is the bottown up approach?
This approach, developed in Britain, aims to generate a profile through systematic analysis of the crime scene, routing behaviour and systematic background without making any initial assumptions about the Offender. Profiling is data-given and emerges as the investigator engages deeper and scrutinizes details about the offence.
This can either be done using Geographical Profiling or investigative profiling.
Explain geographical profiling
Rossmo investigated Geographical Profiling and stated that an offender’s operational base of possible future offences are revealed by the geographical location of their previous crimes.
This involves crime mapping (plotting of locations to reveal patterns of crimes) to make inferences (hypotheses about the Offender or possible crimes), modus operandi (how the Offender acts or what transport they use) and jeopardy surface (using different colours displaying spatial data on a computerised system to indicate the likelihood of a future attack base on the locations of crime scenes). Canter et al proposes using the Circle theory that people operate within a limited spatial mindset that creates imagined boundaries in which crimes are likely to be committed. They can either be marauders (operating in close proximity to their home base) or commuters (travelling a distance away from the usual residence)
Explain investigative profiling
Investigative psychology uses a systematic analysis of all available data from the crime scene to build a profile of the offender using a database to speculate possible details about the Offender such as their personal history or if further crimes would be committed. It is known to be more scientific as it is based on psychological theory.
This method used interpersonal coherence, an assumption that the way an offender behaves at the scene shows how they may interact in real life (Dwyer found that rapists who control and humiliate the victim may have a controlling personality), significance of time and place, may indicate the offender’s location if the crimes are committed within the same forensic centre of gravity and forensic awareness, how mindful they are at covering their tracks (rapists who conceal their footprints have a previous history of burglary).
Evaluate bottom up approach
Evidence supports the importance of investigative psychology.
Canter and Heritage conducted a content analysis of sexual assault cases. They used ‘smallest space analysis’ to examine the data (computer programme which correlates patterns across behaviours). They found common characteristics within the same offenders’ behaviour.
This can lead to an understanding of how an offenders’ behaviour can change over a series of offences or establish if the two or more offences were committed by the same individual.
This supports the view that investigative psychology is useful in showing how statistical techniques can be applied.
Geographical Profiling has been proven to be a useful technique in offender profiling.
Supported by Lundrigan and Carter who collated information from 120 murder cases by serial killers in the USA. They found spatial consistency in the behaviour of the killer, i.e the offender’s base located in the centre of the pattern.
Furthermore, they noticed that marauders were more likely to show patterns of the short distance of location for body disposal.
This real life evidence supports Canter’s claim that spatial information is a key factor in determining the base of the offender.
Despite many successes to this offender profiling, there are mixed results for its effectiveness.
For example, Copson surveyed 48 police forces and found that advice provided by the profiler was only useful in 83% of cases but only in 3% of cases did it lead to accurate identification of the offender. Kocsis also demonstrated that untrained chemistry students produced a more accurate profile than trained police officers in a mock investigation challenging the scientific credibility of the disciple.
Furthermore, the bottom up approach can lead to inaccurate profile as in the case of the Nickell murder when the offender was originally ruled out as he was several inches taller than his profile had suggested.
Therefore, proposing that this profiling technique is not always or accurate in solving murder cases.
Explain the atavistic approach
The Atavistic form, as proposed by Lombroso, is an early biological explanation of criminality which states that criminals are subspecies that lack evolutionary development, or genetic throwbacks, so they struggle to conform or cope with modern societies due to their savage and untamed nature. Thus, he saw criminality as a natural tendency, rooted in the genealogy of those who engage in it.
This approach, although seen as naive and speculative, is credited with moving criminology into a more scientific (as it measures in the same way and produces empirical evidence) and rigorous realm and his ideas may well have laid the foundation for the modern offender profiling techniques that were to follow as it makes predictions about future behaviour
What are the atavistic features and what are they associated with?
Lombroso argued the criminal subtype could be identified as being in possession of particular physiological markers that were linked to particular types of crime. He states that criminals, in general, tend to have dark skin, strong jaws and high cheekbones, murderers tend to have fleshy lips, bloodshot shoes and curly hair, sexual deviants tend to have glinting eyes and projecting ears, and fraudsters have thin lips, reddy lips
What are the other non-physical atavistic features and how were they investigated
Besides physical traits, Lombroso also suggested that there were some other aspects of both criminals including insensitivity to pain, use of criminal slang, unemployment and tattoos.
Lombroso investigated the facial and cranial features of hundreds of Italian convicts both living and dead. After examining 3839 living criminals and 383 dead ones. He concluded that 40% of the crimes were accounted for by atavistic characteristics.
Evaluate the atavistic form
The atavistic form has made a significant contribution to the development of modern criminology.
Firstly, it challenged the accepted view of the time that all crime was simply due to individual choice. This introduces the notion that criminality may sometimes be caused by deterministic forces such as, in the case, a restricted evolutionary level of development which leads to the inability to conform to more complex modern, legal and social codes. Attributing criminality to biological causes still remains a credible explanation as research linking neural functions or genetics are contemporary interpretations of the same basic principle of biological determinism established by Lombroso.
Additionally, Lombroso was the first researcher to apply methods of scientific nature by empirically measuring characteristics of living and dead animals. Despite lacking modern standards of control in his research, he was the first to attempt to support his conclusions with empirical evidence. Today, all credible research is expected to do the same.
This is a strength as these innovations made further criminological research possible and were integral to establishing criminology as a credible discipline.
This approach could be considered racist.
Lombroso’s atavistic characteristics are more likely to reflect
non-White non-European populations. This may be due to unconscious biases that influenced Lombroso’s judgments. At the time, Darwin’s theory of survival of the fittest and the clear dominance of white Europeans in Colonialism are likely to have influenced Lombroso’s interpretation of desirable and adaptive characteristics.
De Lisi demonstrates the obvious bias towards describing typical features of black individuals in Lombroso’s atavistic characteristics such as dark skin and curly hair.
This is a clear limitation as it is lacking scientific validity. Lombroso was subjective in his observations. This condoned the practice of eugenics which caused physical and psychological injury to undeserving victims, reputational damage caused by these assumptions still persist today.
There are methodological issues and contradictory evidence for the atavistic characteristics.
Lombroso studied 4000 criminals. This sample is missing a control group to which the experimental group could be controlled.
Furthermore, Goring compared 3000 criminals and 3000 non-criminals and concluded that there is no evidence of facial characteristics being distinct in the criminal group. He did uphold the view that criminals generally have a below average intelligence level.
This is a significant critique as it devalues Lombroso’s original value and the internal validity of conclusions.
Explain neural explanations
Neural explanations suggest that there may be neural differences in the brains of criminals and non-criminals. Much of the evidence in this area has investigated individuals diagnosed with antisocial personality disorder, which is associated with reduced emotional responses, a lack of empathy and is a condition that characterised many convicted criminals.
How were the neural explanations investigated?
Raine reports that there are several dozen studies, including PET scans of 41 murderers, of APD brains demonstrating lower activity in the prefrontal cortex, the part of the brain which regulates emotional behaviour. Raine also found an 11% reduction in the volume of grey matter in the prefrontal cortex of people with APD compared to controls.
explain genetic explantions
Genetic Explanations for crime suggest that when offenders inherit a gene, or a combination of genes, they are predisposed to commit crime.
Outline research into genetic explanations
The importance of these genes have been investigated in twin studies. Christiansen used a sample of 87 MZ twins and 147 DZ twins and found a concordance rate for criminality of 33% for MZ and only 12% for DZ, supporting the view that offending may have a genetic component.
Adoption studies, on the other hand, compare the outcomes for children with their parents when raised in adopted families. Mednick et al found using a study of 13,000 Danish adoptees that when neither parents had a criminal record, 13.5% had convictions. This increased to 20% when either the biological or adopted parents had convictions and increased to 24.5% if they both had convictions.
Furthermore, Bruner revealed some genetic abnormalities in a large Dutch family of 28 members with borderline mental retardation and abnormal violent behaviour. Males had a genetic condition, Bruner’s syndrome, and low intelligence levels which could have been caused by a deficiency in the MAOA gene which creates enzymes that breaks neurotransmitters, without which there would be a high level of serotonin and dopamine leading to impulsivity and dopamine.
Explain the diathesis stress model in genetic explanations
The Diathesis stress model suggests that a biological predisposition and environment increase the likelihood of offending. If genetics has an influence on offending, it is partly moderated by the effects of the environment. Environmental triggers may include dysfunctional environments, poverty or having criminal role models.
Evaluate the genetic and neural explanations
There are issues with causation and brain scans.
Although there is scientifically credible evidence, just because an area is active does not mean that it is certain which function it is performing. It is possible that that area is a relay station, leading to the area of function.
Others have argued that it is unclear whether the neural dysfunction is a cause of criminality or the effect of another underlying cause, such as injury, trauma or drugs. Therefore, it is difficult to decide whether it is due to the proximal or distal cause.
This is a weakness as causation cannot be asserted between neural dysfunction and criminality using brain scans.
There is an issue with biological determinism.
In the field of criminality, the notion of a criminal gene presents a dilemma. Our legal system is based on the premise that criminals have personal and moral responsibility for their crimes, and only in extreme cases, such as diagnosis of a mental disorder, can someone claim that they were not acting under their own free will.
This raises the ethical question about what society does with people who are suspected or carrying criminal genes and what implications this may have for sentencing.
This is a weakness as it is a complex, unresolved issue with no answer.
Twin studies are quasi experiments which may have confounding variables.
As most MZ twins are raised in a more similar environment than the DZ twins, environment might act as a confounding variable as concordance rates may be due to shared experience. This factor may also affect family studies.
Adoption studies, on the other hand, negate this weakness as adoptees are raised in a different environment. However, later adoptions and remaining contact with biological parents means that the biological parents may act as an environmental and biological impact.
Although this research provides strong empirical evidence, it is a limitation as it is impossible for researchers to control all the variables in a quasi experiment, making it difficult to assert causation between an individual’s genetic makeup and their criminality.
Outline Eysenck’s personality
ysenck developed a theory of personality based on the idea of character traits. Personality can be measured through an EPQ test which measures the level of characteristics including extraversion, neuroticism and psychoticism.
Explain extraversion
Extraversion includes seeking more arousal therefore engaging in dangerous activities which may result in crime. Extroverts are more outgoing and may jae positive emotions but get bored easily and they fail to reflect and learn from mistakes. The biological basis for this would be an underaroused nervous system and seeks external stimulation to increase their cortical arousal.
Outline neuroticism
Psychoticism can be easily linked to criminality because individuals are aggressive and lack empathy. Psychotics are egocentric, aggressive and are not concerned with others’ welfare. It is linked to high levels of testosterone.
Explain psychoticism
Psychoticism can be easily linked to criminality because individuals are aggressive and lack empathy. Psychotics are egocentric, aggressive and are not concerned with others’ welfare. It is linked to high levels of testosterone.
What did Eysenck see criminal behaviour as indicative as?
Eysenck saw criminal behaviour as indicative of lower development in terms of maturity as offenders seek immediate gratification. Instead, socialisation teaches children crucial skills such as delayed gratification and social skills, but individuals high in extraversion, neuroticism and psychoticism are less responsive to socialisation or conditioning. Therefore, they are more likely to engage in criminal behaviour.
Evaluate Eysenck’s criminal personality
Eysenck claimed to support his theory with empirical evidence.
He assessed 2070 male prisoners who were compared to a control group of 2422 males. On measures of extraversion, neuroticism and psychoticism, prisoners recorded higher scores than the control group which accords with the prediction of the theory.
However, Farrington et al reviewed several studies and found that offenders tend to score highly on psychoticism measures but not on Extraversion and neuroticism, suggesting that Eysenck’s theory is somewhat true but not as a whole.
In conclusion, only the link between psychoticism and crime can be seen as a reliable finding casting doubt on the validity of the theory as an explanation for crime.
There exists evidence to suggest that personality cannot be considered a permanent trait.
Michel attempted to test this assumption. He asked family, friends and strangers to rate 63 students in a variety of situations. After a correlational analysis, no clear personality traits were consistently observed.
He concluded that individuals may display different personality traits in different situations. He coined this the ‘situation effect’.
This suggests that the notion of a criminal personality is flawed as individuals do not have one permanent personality type that will have a consistent effect on their behaviour, in this case offending. Instead, it may be more accurate to suggest that individuals may exhibit a criminal personality in some situations only.
Cultural bias may be present in Eysenck’s conclusions.
Bartol and Holanchock studied African-American and Hispanic offenders in a maximum security prison in New York. They found that they had lower extraversion scores than an ethnically matched non-criminals control group.
This challenges Eysenck’s personality theory as it may not explain ethnic minority criminality therefore conclusions are not ethnocentric and the original sample was not representative enough to be generalisable to other populations therefore lowering the external validity.