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