forensic Flashcards
forensic psychology
psychological principles that are applied to different stages of the criminal justice system
crime
unlawful behaviour punished by the state. harmful to society.
problems with defining crime
it is a culturally relative concept - e.g polygamy. it also changes over time - e.g smacking your kids
offender profiling
analysing behaviour/ circumstances of the crime scene to profile characteristics of an unknown offender
top down approach to offender profiling
pre established typology of offenders looked at and works down to the details of the crime scene placing them into one of two categories.
organised offenders
socially/ sexually competent with high IQ. targets specific victim. evidence is destroyed, planned.
disorganised offenders
of low intelligence that does spur of the moment attacks and leaves evidence. unplanned, usually known to victim
top down approach study by FBI
1978 - data gathered from interviews with 36 sexually motivated murderers.
found disorganised and organised offenders
limitation of top down approach
based on restricted data from 36 ppts. unrepresentative of typical offenders. Godwin (2002) argues that one killer may posses traits from both so info is not valid. means they cannot be applied to whole offending population
strength of top down approach
support for organised offender. Canter - analysis of 100 US murders by diff killers. used statistical tech to identify behaviour across crimes and found correlations analysing aspects of killings. set of features for organised killers. however, not for disorganised.
limitation too top down approach - personality
based on consistent behaviour. should mean they can link crimes together to catch offender. however, Mischel (1968) said behaviour is driven more by situation. this means patterns at crime scenes tell us little about the offenders regular behaviour
bottom up approach
profilers work up from the evidence collected from the crime scene to develop characteristics of offenders
investigative approach
statistical analysis of offender behaviour.
interpersonal coherence
the way an offender behaves at the scene may indicate everyday life.
significance of time and place
may indicate where offender lived if taken place in same forensic “centre of gravity”
forensic awareness
focus on those who have already been in police’s interest. behaviour may show how mindful they are in covering their tracks
geographical approach
spatial consistency. Rosmo found they commit crimes in circles. can make inferences about where they live and where they strike next.
marauder
offender lives in geographical area
commuter
travels to other area to commit crime
strength of bottom up approach
evidence to support investigative psychology. Canter - 66 sexual assault cases, behaviours were identified as common. helps see if offences were commit by same person. shows people are consistent in behaviour
weakness to the bottom up approach
offender profiling has a mixed history of being accurate. served 48 police departments and advice by profilers was proven 83% useful - valid. same studies showed 3% of cases lead to accurate identification. Rachel nickel shows profiling can be misused - should be more skeptical
atavistic form
criminals lack evolutionary development. biologically different and can’t survive society without turning to crime.