I wrote this post in 2021 in another blog, and all these variables appear in the book Elements of Crime Patterns, along with others, in a different format.
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In an ideal world, it would be easy for officers to collect as much data as was relevant to link serial crimes. But officers are human - they are rushed, are not trained to see the point of all this extra work, and possibly are forced by their data entry fields to leave out important information.
Some information is later collected by detectives who also are rushed, do not see the point of sharing with analysts, or don't ask enough good questions.
Nevertheless, here is a short example list of how a suspect and victim make contact when there are crimes against persons. Analyzing the modus operandi for commonalities when looking for serial crimes should include this variable: CONTACT.
Though an Advertisement
Ambushed Victim
Lured Victim
Both In an Entertainment Place
Forced Entry in Dwelling/Building/Vehicle
Hitchhiked with Victim
Home/Residence Invitation
Known to Victim
Through Mail
Through Email
In Cyberspace
Rang/Knocked for Entry
Suspect a Pedestrian
Suspect a Relative
Suspect an Employee
Suspect a Former Employee
Victim Entered Suspect's Business
Victim a Hitchhiker
Victim a Pedestrian
Victim Drugged by Suspect
Suspect Entered Victim's Business
What other means of contact would you put on this list?
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