Originally posted by jerryd
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It gets over hyped, certainly in the media and movies, and comes across as if the goal is to pin-point a specific address. That's used-car salesman talk. The goal is to suggest areas that have a higher probability of containing the offender than others. The probabilities are derived from emperical testing. In the simplest form, an offender could be anywhere, they may travel 100 miles every week just to commit their crimes in some specific area, or they may randomly drive in various directions. But they don't. If you have a bunch of crimes that you know are committed by the same offender, draw the smallest circle you can that rings in all the crimes. You've just done a geographical profile, and you have about 80% chance of just having drawn a circle around your offender (meaning, if you did that for the crime locations from 10 different series, Ted Bundy, Dennis Rader, Albert Desalvo, etc then you might only expect 2 of them to have escaped your net. Now, to be fair, some of those nets are still pretty big. The idea is to refine that, and try and figure out, where in my ring should I start my search. It's not fool proof, there are cases that "buck the trend" (like the 2 who don't live inside the circle we drew), but it's not about solving cases, that's what detectives and investigators do, it's about providing information with regards to probabilities, a suggested ranking of priorities - where to investigate next, until real leads and evidence get located. I guess, this is more about trying to suggest where might be a good place to find those leads and evidence. But it's cool to hear that some suspects exist in the locations highlighted.
- Jeff
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