Forensics - John Duffy Case Study (Strength) Flashcards
What crimes did JD commit? Why was he a suspect?
He committed 24 sexual assaults and 3 murders between 1982-1986. Duffy matched Canter’s profile very closely which was based on details from the crime.
What was JD’s personal characteristics in comparison to the profile?
The offender would know about British railways:
Duffy had worked for British rail.
The offender would also be small and feel unattractive:
Duffy had acne and was 5’4’’.
The offender would be in his mid to late 20s:
Duffy was in his late 20s.
What was JD’s residential location in comparison to the profile?
He would live close to the first three crimes:
Duffy lived in the same town of Kilburn.
What was JD’s criminal history in comparison to the profile?
The offender would have a criminal record with violence:
Duffy had raped his wife at knifepoint, this was recorded by police.
What were JD’s domestic traits in comparison to the profile?
The offender would fantasise about sex and violence:
Duffy had hard-core pornographic videos.
The offender would also be interested in martial arts:
Duffy was in a martial arts club.
What was JD’s occupation in comparison to the profile?
His occupation would be either skilled or semi-skilled:
Duffy was a carpenter.
Why did OP become increasingly used?
In total, Duffy fit 13 out of the 17 characteristics developed by Canter.
From there, offender profiling became much more commonplace.
