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升级   33% TA的每日心情 | 开心 2015-6-16 08:14 |
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签到天数: 83 天 [LV.6]常住居民II
群组: 计算机考研 群组: Matlab讨论组 群组: 数学建模 |
I looked up at my field trainer, a little uncertain - do most victims supply us with composite sketches I think it may .provide me with guidance so I said ¡°Well, sir, I would very much like to take a look at that.¡± He goes over to a chest of drawers, pulls one open, rummages underneath his shirts and sweaters, comes up with a piece of ** which he very carefully proudly hands to me. This is what was on the piece of **. (audience laughter at a picture of a matchstick man) Uncertain what to do, I just said ¡°Well, sir, if we ever see anybody like this we¡¯ll be sure to stop and talk to him.¡± That was not useful information. That did not help the investigation. So we have information of varying levels of quality as well.
We¡¯ve been very good in the past, in terms of putting up crime scene tape and looking within it for all sorts of clues, hair and fibre, DNA, ballistics, footprints, fingerprints, but sometimes we haven¡¯t stopped to consider the fact that for that crime to have occurred the offender and the victim had to come together in time and space. And by considering that question we can sometimes get a perspective on where the offender¡¯s coming from, where he¡¯s based.
Suitable crimes for geographic profiling are those that are serial in nature, murder, rape, robbery, arson, bombings, predatory crimes where there¡¯s hunting behaviour on the part of the offender such as we might see in ** homicides or child molestings, what we call multiple location crimes - locally we had a man who murdered a teenage girl on one of the suburban streets, then he made a series of taunting phone calls to the police from telephone kiosks. By the time he was done we had ten locations available for analysis, which allowed us to predict his home within six tenths of a square mile. Similarly, we have victims who have bank cards or credit cards stolen, which are then used in retail outlets or to make withdrawals from automated teller machines. We can use that type of information. Then, finally we¡¯ve had some success in very specific types of cases, where we have a missing person that¡¯s a suspected homicide victim, we¡¯re trying to determine where the body might be. |
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