Forensic Flashcards
What can crime be defined as?
Any act that breaks the law and warrants some form of punishment - legalistic definition
Why is the legalistic definition of crime complicated?
As the laws are often subject to change and not all acts that break the la are punished
Once we have settled on a definition of crime what happens next?
We are concerned with the extent of the crime, it helps government generate policies and direct resources to the most relevant areas
What are the 2 major issues in defining crime?
Cultural issues - one crime in one country may not be judged as a crime in another, culturally specific e.g. having more than one wife is bigamy and forced marriage was made illegal in 2004 but still happens
Historical issues - definitions of crime change over time, historically specific e.g. parents right to smack a child outlawed in 2004 under Children’s Act and homosexuality was considered a crime until 1967 in UK
What are the 3 methods of measuring crime rates?
Official statistics, victim surveys and offender surveys
What are official stats?
total number of crimes reported to the police. Published every year by the home office, provides snapshot of crimes in the country and specific regions. Allows government to develop crime prevention strategies and policing initiative’s as well as direct resources.
What is some evaluation of official stats?
Can be unreliable as they significantly underestimate the true extent of crime, some commentators suggest only around 25% of offences are included in official states, the other 75% refers to the dark figure of crime. Suggests there are obvious policing priorities which may distort official figures.
What are victim surveys?
Record victims experiences of crime over a specific time period (1 year). 50,000 households are randomly selected to take part in the survey, which has been extended in 2009 for young people age 10-15. Published annually.
What is some evaluation of victim surveys?
More likely to include details of crime not reported to the police, so a greater degree of accuracy. 2006/7 statistics suggested a 2% decrease in crime than the previous year, but British Crime Survey showed a 3% increase. However, they rely on the accuracy of the victim, when ‘telescoping’ can occur (misremembering).
What are offender surveys?
Individuals volunteering the number and types of crime they have committed. Targets groups of likely offenders based on risk factors (age, social background etc.) Offender Crime and Justice Survey 2003-2006 was the first national survey of its kind in England and Wales
What is some evaluation of offender surveys?
Provides insight into how many people are responsible for certain offences. Although confidentiality is assured, responses may be unreliable as offenders may want to conceal more serious crimes they have committed or even over exaggerate for their social status. Targeted nature of this survey (burglaries) may be over represented whereas ‘middle class’ offences (white collar crimes) are unlikely to be included.
As all the methods of collecting crime stats have reliability and validity issues, researchers advocate a multi-disciplinary approach. What is this?
Combination of all methods to provide best insight into true extent of offending
What would be gained from a combined approach?
Different measures are used for different purposes, they all fill in the limitations of each other so using all 3 gives us a fuller understanding of crime and the dark figure
What is offender profiling?
Based on the idea that he characteristics of an offender can be deduced from the characteristics of the offence and the crime scene
What is the aim of offender profiling used by the police?
To narrow down the field of suspects to a likely list
What are the 2 approaches to offender profiling?
FBI in USA follow a top-down approach, in the UK we use a bottom-down approach
Both are used to work out what offender is like
Both used alongside conventional police work
When was the top-down approach developed?
By the FBI in 1970’s, the FBI’s behavioural science unit carried out in depth interviews with 36 sexually motivated serial killers and used data to develop a categorisation system of crimes
What are the categories in the top-down approach?
Organised or disorganised (based on the idea that the offenders have a ‘signature way of working’ - modus operandi) this correlates with social and psychological characteristics
What are some characteristics of the crime scene and offender who is organised?
Planned crime, deliberately targeted victim, type, high degree of control, little evidence or clues left
Above average IQ, professional occupation, socially and sexually competent, usually married with kids
What are some characteristics of the crime scene and offender who is disorganised?
Little evidence of planning, spontaneous, body usually left, very little control of offender
Lower than average IQ, unemployed, history of sexual dysfunction and failed relationships, live alone and close to where offence was committed
What are the 4 steps to constructing an FBI profile?
Data admission - profiler reviews the evidence
Crime scene classification - either (dis)organised
Crime reconstruction - hypothesis of events and behaviour
Profile generation - hypothesis related to likely offender (demographic background, physical characteristics, behaviour)
What are the 4 weaknesses to the top down approach?
Can only be applied to certain crimes (murder and rape - very rare), not others as crime scene reveals very little about offender
Based on outdated models of personality (static personality, recent research suggests personality is more dynamic - less patterns of behaviour)
Classification is too simple (combination of both, Holmes 1989 suggested 4 types of serial killers; visionary, mission, hedonistic and power/control)
Relied on self-report data of 36 American killers
What did Pinizzotto and Finkel 1990 find about the effectiveness of profilers?
Compared 5 groups on ability to write profiles of a murder case. Expert profilers, detectives with and without profiling experience, clinical psychologists and undergraduates. Detectives without profiling were significantly more accurate, so profilers not as effective as they should be
Who developed the british bottom up approach and what is it?
David Canter in the 1980’s
Forensic psychologists work up from evidence collected at crime scene to develop hypothesis about offender, no fixed classifications in mind unlike FBI
What is the bottom up approach more grounded in?
Psychological theory and is more scientific and objective than top-down approach
What are the 2 examples of the bottom up approach?
Investigative psychology and geographical profiling
What is investigative psychology?
Details of crime scene matched with statistical analysis of typical offender behaviour patterns. Details matched against a statistical database to reveal offender characteristics to determine whether a series of offences was by same person
What do the key variables of investigative psychology include?
Interpersonal coherence - way offender behaves including interaction with victim
Significance of time and place - may indicate where offender is living
Forensic awareness - describes individuals who have been subject to police interrogation before, can track those who may be ‘covering their tracks’
What is geographical profiling?
Proposed by Rossmo in 1997 - idea of crime mapping
Based on idea of spatial consistency, offenders home may be discovered through place of offences and possible future offences (jeopardy surface). Circle theory - if a circle is drawn that encompasses all of a series of linked crime, offender will usually live within the circle
What were Canter’s 2 models of offender behaviour?
The marauder - operates in close proximity to home
The commuter - likely to have travelled a distance
A criminal follows a mental map of an area so their offences can make inferences about them. What example did Canter use?
John Duffy - Railway rapist, predicted Duffy must know knowledge of railway network more than a casual rail user. Turned out he was a carpenter employed by British Rail
What are the 3 strengths of the bottom up approach?
Supporting evidence from Lundrigan and Canter 2001 - got info from 120 serial killers in USA and examined in computer programme ‘smallest space analysis’ which revealed spatial consistency in offenders behaviours, offenders base was in centre creating a ‘centre of gravity’
It can be applied to wider range of offences than top-down approach
More scientific approach, less driven in speculation, more grounded in evidence and can help with the rest of the investigation
What is the 1 weakness of the bottom up approach?
Studies into effectiveness have found mixed results - Copson 1995 surveyed 48 british police forces and found advice was useful in 83% of cases but only led to identification of offender in 3% of cases
What are the 2 umbrellas underneath the biological explanations?
Lombroso and genetic and neural explanations - both share assumption that crime is an innate tendency and may be genetically determined or result of abnormalities in brain structure and/or function
What is Lombrosos theory called and what is the main assumption?
Atavistic form theory stating that criminals are ‘genetic throwbacks’
What does Lombroso believe criminals are?
Biologically different from non-criminals, they have failed to evolve and therefore have a savage, animal nature meaning they cannot cope with the demands of living in a civilized society
What is Lombrosos theory nowadays considered as?
Speculative and naive, although he is credited with moving criminology to a more scientific realm as the ideas have laid the foundations for modern offending profiling approaches
What did Lombroso believe criminals have?
Distinctive, physical characteristics or physiological markers particularly in the face and head
What are some of the typical features Lombroso labelled as ‘criminal’?
Narrow brow, strong jaw, high cheekbones, dark skin and extra toes/fingers/nipples
What were some of the features of the subtypes of criminals Lombroso mentioned?
Murderer - bloodshot eyes and curly hair
Sex offender - glintng eyes, swollen lips
Fraudster - thin and reedy lips
How did Lombroso conduct his research?
examining skulls of 383 dead criminals and 3839 live ones and concluded 40% of criminal acts were due to ‘atavistic form’
What are the 3 weaknesses of Lombrosos biological explanation?
Poor control in his research to support as did not compare to a non-criminal group, features could have disappeared, also failed to account for other important variables (history of psychological disorders)
Matt DeLisi 2012 bought attention to distinct racial undertones most likely of people of African descent
Causation issue - facial differences may not necessarily cause their offending, they could just be influenced by other factors e.g. poverty
What did Lombroso later realise about his work?
That criminals can be made as well as born due to some environmental factors
What is the 1 strength of Lombrosos biological explanation?
He is credited as shifted emphasis of crime research away from moralistic discourse towards a more scientific/credible realm, he heded the beginning of criminal profiling