forensics Flashcards
define crime
any act that is unlawful or punished by the state
what is offender profiling
refers to the popular conceptions of how offenders are caught.
describe the top down approach
also called crime scene analysis, an analysis of a previous crime can help find a likely suspect. for example if two women were killed with a hammer in close areas, they may be linked crimes
give 3 negative factors about the top down approach
- wont work on an offenders first offense
- little focus on prevention of future crimes as it requires more crimes to be committed to link them together
- crimes by one individual may have no outstanding links. e.g they could kill a woman with a gun in the forest and then a man with a knife in the city
what is an organised offender?
these are individuals who plan their crime out and do things such as cover their tracks. high levels of engagement with a selected victim
what is a disorganised offender?
an offender who commits a crime with little planning. low levels of engagement with a randomly selected victim
which type of offender is harder to catch?
organised
describe the bottom up approach
a data driven technique where statistical techniques are used to generate a prediction. for example, if an offender killed two women by a lake 1 week apart from each other, they may do that exact thing again
give 2 negatives of the bottom up approach
- wrongful convictions due to multiple people fitting the profile
- generally unreliable
what is geographical profilling?
a form of bottom up profiling based on the location of crimes committed
what is investigative psychology
a form of bottom up offender profiling based on psychological theory
what is the atavistic form?
a explanation for criminal behaviour suggesting offenders are born with a criminal personality
who researched the atavistic form?
Cesar Lombroso
what is the genetic explanation for offending?
one or more genes predispose individuals to criminal behaviour
what is the difference between a monozygotic twin (MZ) and a dizygotic twin (DZ)
MZ twins are genetically the same whereas DZ twins are 50%