FORENSICS Flashcards
(239 cards)
Who is Ted Bundy?
- Raped, tortured and brutally murdered over 30 women across 7 US states
- handsome, charming and highly intelligent- classic ‘organised’ killer
- He won the trust of his victims
- attended university of Washington and law school-excelled
- killings usually followed a gruesome pattern- raped victims before beating them to death
- Escaped police custody twice
- electrocuted in 1989
- many of his victims resembled his college girlfriend (devastated by break up)-attractive students with long, dark hair parted in the middle
Where do you go for some extra criminal profiling notes (cover- video)?
Lesson 2- (4th Sept), Forensics
What is offender profiling?
- idea that the characteristics of an offender can be deduced from the characteristics of the offence and the particulars of the crime scene
- also known as ‘criminal profiling’
- behavioural and analytic tool that is intended to help investigators accurately predict and profile the characterises of unknown criminals
- used when solving crimes
- aim is to narrow the field if enquiry and list likely suspects
- professional profilers are often called upon to work alongside the police
- main method used involved compiling of a profile. It will usually involve scrutiny of the crime scene and analysis of evidence like witness reports
- this is then used to generate a hypothesis about probable characteristics of the offender eg: age, background, occupation…
What is the top-down approach?
- start with a pre-established typology and reduce down in order to assign offenders to one of the two categories based on witness accounts and evidence from the crime scene
- American approach (created in 1970s by FBI)
- This was called the FBI’s Behavioural Science Unit which drew upon data gathered from in-depth interviews with 36 sexually motivated serial killers eg: Ted Bundy and Charles Manson
- Also known as the typology approach
- offender profilers that use this method will match what is known about the crime and the offence to a pre-exiting template developed by the FBI
- murderers or rapists are classified in one of two categories (organised or disorganised based on the evidence. This informs the subsequent police investigation
What is an organised offender?
- shows evidence of planning, targets the victim and tends to be socially and sexually competent with higher than average intelligence
- deliberately targeted victim
- killer or rapist usually has a ‘type’
- Have a high degree of control during the crime
- operates with almost detached surgical precision
- little clues or evidence left behind at the scene
- above- average intelligence- skilled, professional occupation
- socially and sexually competent
- usually married and may even have children
- planned crime in advance
What is a disorganised offender?
- an offender who shows little evidence of planning, leaves clues and tends to be socially and sexually incompetent with lower than average intelligence
- may be spontaneous, spur of the moment act
- crime scene usually referents impulsive nature of attack
- little control by the offender
- body is usually still at the scene
- lower than average IQ- unskilled work, unemployed
- usually have history of sexual dysfunction and failed relationships
- usually live alone
- usually live close to where the offence took place
What does an organised or disorganised killer suggest about the criminal?
- based on the idea that serious offenders have certain signature ‘ways of working’- referred to as their modus operandi
- generally correlate with a particular set of social and psychological characteristics related to the individual
What are the 4 stages to constructing an FBI profile?
1) Data assimilation- the profiler reviews the devienne (crime scene photographs, psychology reports, etc…)
2) Crime Scene Classification- as either organised or disorganised
3) Crime reconstruction- hypothesise in terms of sequence of events, behaviour of the victim, etc
4) Profile generation- hypotheses related to the likely offender eg: of demographic background, physical characteristics, behaviour… etc
Evaluation- disadvantage- only applies to particular crimes
-limited approach to identifying a criminal as more common defences such as burglary an destruction of property (or even murder or assault committed during these offences) do not lend themselves to profiling- tells us very little about the offender
Evaluation- advantage- helps identify serious crimes:
- top down profiling is best suited to crime scenes that reveal important details about the suspect such as rape, arson, cult killings.
- Also crimes involving macabre practices- sadistic torture, dissection of the body, acting out fantasies
Evaluation- disadvantages- based on outdated models of personality:
- the typology classification system relies on patterns of behaviour and motivations to remain consistent across situations and contexts
- Alison et al is one critic who believes the approches naïve and old fashioned. She suggests that it is negative to see behaviour as being driven by stable dispositional traits rather than external factors which may constantly change
- poor validity when identifying possible suspects or trying to predict their next move (top-down approach based on ‘static’ models of personality)
Evaluation- disadvantages- evidence does not support the ‘disorganised offender’:
- David Canter et al (2004)
- used a technique called ‘smallest space analysis’
- Analysed data from 100 murders in the USA
- Examined with reference to 39 characteristics thought to be typical of organised and disorganised killers
- organised type was distinct but disorganised undermined the classification system as a whole
- still has widespread support and is still used as a model for professional profilers in the US
Evaluation- disadvantages- classification is too simplistic:
- Behaviours described in each of the organised and disorganised types are not mutually exclusive- variety of combinations could occur in any given murder scene
- Grover Godwin (2002)- asks what happens if the two mix eg: how police investigators would classify a killer with high intelligence and sexual competence who commits a spontaneous murder in which the victim’s body is left at the crime scene
-HOWEVER, positive as it promoted more detailed typological models eg:
⭐️Ronal Holmes (1989) suggested there are 4 types of serial killer- visionary, mission, hedonistic power/ control
⭐️Robert Kepler and a Richard Walter (1999) focused on the different motivations killers might have rather than specific ‘types’
Evaluation- disadvantages- original sample:
- Developed using interviews with 36 killers in the US- 25 of which were serial killers, the other 11 being single or double murderers
- Too small and unrepresentative a sample which could effect the police investigation
- Carter also argued that it is not sensible to rely on self-report data with convicted killers when constructing a classification system
Where can you find summary?
Lesson 3, (7th Sept)- Green highlighter ‘The Top-down Approach’- folder
What happens after classification?
- once profilers have matched the crime to pre-existing template they can now construct a profile
- this includes hypothesis about the offender’s background, habits, beliefs, looks etc.
- used to work out a strategy of investigation
- profilers also consider how the offender is likely to react if they are being investigated
What grave points do the different evaluation points link to?
1) Subjective to profiler- weakens reliability
2) Application- only certain crimes
3) Generalisability- only serial killers and all in America, small sample
4) Rigid classification/ inflexible- weakens validity
Who disagreed with the top-up approach? What did he do instead ?
- Canter
- created a new approach= Bottom-up approach (start with nothing and build case, rather than starting with a type/ classified killer)
What was the aim and procedure of Canter’s study?
- Canter (2004):
- Aim= To test the reliability of the top-down typology by applying them to 100 cases
- Procedures:
- a content analysis of 100 cases of serial killers from the USA
- The cases came from published accounts of serial killers and were cross-checked with court reports and officers where possible
What were Canter’s findings?
-findings:
-twice as many disorganised crimes as organised crimes were identified, suggesting that disorganised offenders are more common or easier to identify
-Two behaviours in the organised typology occurred a level significantly above chance:
⭐️In 70% of cases, the body was concealed
⭐️In 75% of cases, sexual activity had occurred
-Further analysis failed to reveal any significant differences between organised and disorganised variables
What were Canter’s conclusions?
- canter concluded that instead of their being a distinction between the two types of serial murderer, all of the crimes had to have an organised element to them
- the distinction between serial killers may be a function of the different ways in which they exhibit disorganised aspects in their activities
- It would be better to look at personality differences between offenders
What was Canter’s Bottom up approach?
- Canter’s bottom up approach looks for consistencies in the offender’s behaviour during the crime
- these can be inferred from the crime scene, or from surviving victims accounts
- no initial assumption is made about the offender until a statistical analysis using correlational techniques has been carried out on the denials of the cases (Similar studies found- small space analysis)
- The approach relies heavily on computer databases being accurate
- this approach can be considered more objective and reliable
What are the possible issues with Canter’s bottom up approach?
☹️Harder to input some details
☹️Loss of data, cyber crime
☹️Human error- relies heavily on human input
☹️New evidence- may not fit profile, may have convicted the wrong person
☹️Anomalie eg: Rachael Nickels
☹️Eye witness testimony-inaccurate eg: anxiety
☹️Not all crimes are reported eg: rapes
☹️Leading questions
☹️Not all crimes are followed up
What are the 2 parts to Canter’s theory?
1) Investigative psychology
2) Geographic profiling