Forensic Psychology Flashcards
Offender Profiling
- Is a tool employed by the police to narrow down the list of likely suspects
- OP is based on the idea that the characteristics of the offender can be deduced from details of the offence + crime scene
- Profiling methods usually involve scrutiny of the crime scene + analysis of evidence (e.g. witness reports) to generate a hypothesis about the probable characteristics of the offender (age, background, occupation etc)
Top Down Approach
- Templates of organised offender + disorganised offender are pre-existing in the mind of the profiler
- Evidence from crime scene + other details of the crime/victim/context are then used to fit the offender into 1 of the 2 pre-existing categories + determine the offender as one of the types
Organised Offenders
- These offenders show evidence of having planned the crime in advance + the victim is deliberately targeted + has a preference for a certain type of victim
- They maintain a high level of control during the crime + operate with surgical precision + little evidence left behind at the crime scene
- Offenders tend to be above average intelligence + in a skilled profession + are socially and sexually competent + often married and have children
Disorganised Offenders
- These offenders show little evidence of planning suggesting the offence may have been spontaneous
- Crime scene tends to reflect the impulsive nature of the attack + body is usually left at the scene + appears to have been very little control on the part of the offender
- Offender tends to be of lower than average intelligence + be in unskilled work or unemployed + often have a history of sexual dysfunction or failed relationships + tend to live alone + often relatively close to where the offence took place
Disadvantage of Top Down Approach (1) - limited application
- TD profiling only applies to certain crimes e.g. rape, arson, cult killings + murders that involve macabre practices such as sadistic torture, dissection etc
- Common offences such as burglary don’t lend themselves to TD profiling because the crime scene reveals very little about the offender
Disadvantage of Top Down Approach (2) - unrepresentative
- The organised or disorganised distinction was developed based on interviews with 36 serial killers in the USA
- Critics have pointed out that this is too small + unrepresentative sample to base a typology system
Disadvantage of Top Down Approach (3) - self report
- TD profiling was developed based on interviews with 36 sexually motivated serial killers including Ted Bundy and Charles Manson
- Canter argued that it’s not valid to rely on self report data from convicted serial killers when constructing a classification system
Disadvantage of Top Down Approach (4) - types of serial killers
- The organised or disorganised distinction is overly simplistic
- Holmes (1989) suggests there are 4 types of serial killers:
1. Visionary serial killer - kill because God or the Devil is directing them to + suffer from psychosis
2. Mission serial killer - kill to eradicate a group of people they consider to be undesirable
3. Hedonistic serial killer - kill for the thrill + sexual pleasure
4. Power serial killer - kill to have complete control over the victim
Bottom Up Approach
- Was developed in the UK
- Aim of this approach to generate a picture of the offender including their likely characteristics, routine behaviour + social background
- This is achieved thru systematic analysis of evidence left at the crime scene
- BU approach doesn’t begin with fixed typologies (as the TD approach does) instead the profile is data driven + the profiler engages in rigorous scrutiny of the details of the offence
Investigative Psychology
- Aim of investigative psych is to establish behaviours that are likely to occur at certain crime scenes
- This is done to create a statistical database which then acts as a baseline for comparison
- Specific details of an offence can then be matched against this database in order to reveal statistically probable details about the offender (their personal history, family background etc)
- This can help determine whether multiple offences are linked + likely to have been committed by the same individual
Interpersonal coherence
- Is a concept central to investigative psych
- The way in which an offender behaves at a crime scene + how they interact with the victim may reflect their behaviour in everyday situations
- E.g. whilst some rapists want to control + humiliate their victims others can be apologetic
- This might tell the police how the offender relates to women more generally
- The significance of time and place of the crime is also a key variable + may indicate where the offender lives
Forensic Awareness
- Describes individuals who have made an attempt to cover their tracks e.g. hide the body/murder weapon or clean the crime scene
- Their behaviour may indicate that they have been subject of police interrogation in the past or even that the police already have their DNA or fingerprints on file
Geographical profiling
- Is the study of spatial behaviour in relation to crime + offenders
- It focuses on the location of the crime as a clue to where the offender lives, works and socialises
- Relevant data includes the crime scene, local crime stats, local transport and geographical spread of similar crimes
- The assumption is that a serious offender will restrict their criminal activities to an area they are familiar with + the offenders base will therefore be in the middle of the spatial pattern of their crime scenes
- Earlier crimes are likely to be closer to the offenders base than later crimes
- As an offender becomes more confident they will travel further from their comfort zone
Canter and Larkin (1993) propose 2 models of offender behaviour:
- The marauder - who operates close to their home
- The commuter - who is likely to have travelled a distance away from their home
- The spatial pattern of their crime scenes will still form a circle around their home
- This becomes more apparent the more offences that are committed
- The spatial pattern of a crime can also tell the police whether the crime is planned or opportunistic + other important facts about the offender e.g. mode of transport, employment status, approximate age etc
Advantage of Bottom Up Approach (1) - more scientific
Canter argues that BU profiling is more scientific than TD profiling because it is more grounded in evidence and psychological theory + less driven by speculation and hunches than TD profiling
Advantage of Bottom Up Approach (2) - wide application
BU profiling unlike TD profiling can be applied to a wide variety of offences such as burglary and theft as well as murder and rape
Disadvantage of Bottom Up Approach (1)
- Copson (1995) surveyed 48 police forces + found that the advice provided by a profiler was judged to be useful in 83% of cases
- But in only 3% of cases did it lead to the accurate identification of the offender
- Kocsis (2002) found that chemistry students produced a more accurate offender profile than experienced senior detectives
- This implies that the BU approach is little more than common sense and guess work
Disadvantage of Bottom Up Approach (2)
- There have been some significant failures when using BU profiling
- In 1992, 21 yo Rachel Nickell was stabbed 47 times + sexually assulated in a frenzied attack on Wimbledon Common
- In 2008, following examination of forensic evidence Robert Napper was convicted of the murder
- He had been ruled out early on in the inital investigation because he was several inches taller than the profile had claimed the offender would be
Historical Approach to Offending
- In 1876, Lombroso (an Italian physician) wrote a book in which he suggested that criminal were genetic throwbacks, a primitive sub species who were biologically different from non criminals
- 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 + inevitably turn to crime
- Lombroso saw criminal behaviour as a natural tendency rooted in the genealogy of those who engaged in it
Atavistic Form
- Lombroso argued that the criminal sub species could be identified by a set of physiological characteristics that were linked to particular types of crime
- These were biologically determined atavistic characteristics mainly features of the face and head + which indicate that criminals are physically different from the rest of us
Atavistic
Meaning reversion to something ancestral
Features of the atavistic form:
- In terms of cranial characteristics, the atavistic form included: a narrow sloping brow, a strong prominent jaw, high cheekbones, facial asymmetry, dark skin, extra toes, nipples or fingers
- Murders were described as having: bloodshot eyes, curly hair, long ears
- Sexual deviants as having glinting eyes, swollen/fleshy lips + projecting ears
- Lips of fraudsters were thin and reedy
- Besides physical traits Lombroso also suggested that there were other characteristics including insensitivity to pain, use of criminal slang, tattoos, unemployment
Lombroso’s research
- He examined the facial + cranial features of Italian convicts (both living and dead) + proposed that the atavistic form was associated with a no of physical anomalies which were key indicators of criminality
- In total he examined the skulls of 383 dead criminals and 3839 living ones + concluded that 40% of criminal acts could be accountable by the criminal subculture
Advantage of Atavistic Form (1) - shift
- The atavistic form has an important role in the shift away from theories based on feeble-mindedness, wickedness + demonic possession
- It was the forerunner to most biological explanations (of evolutionary influences + genetics)