Criminal Investigation Notes

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Criminal Investigation Notes Chapter 16:

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Su Hui stood up, and he leisurely introduced: "This is just a simple schematic diagram, time is limited, I didn't draw it in a standard way, just to introduce the principle to everyone. The method I used today is not what everyone understands. It is a branch of the criminal psychological profile, which is called GeographicProfiling, which is also a criminal geographic profile. Its principle is to combine the perpetrator and the victim with data such as the encounter location, attack location, killing location, and body throwing location. the criminal minds of the criminals, and deduce the criminal's residence, the location of the dismemberment, the place of work or the possible foothold."

Su Hui continued: "Actually, this theory just sounds advanced, and there were some sayings among many old detectives in the past. Also, 'not close, not far, not repeating'. In fact, these are the basic principles of criminal geographic profiling, but what I deduce now is more systematic."

Then Su turned around to face the crowd and explained in detail: "If there is no crime location, there will be no crime. The choice of location by criminals is not random, we need to look for the rules, and there are some basic theories, which everyone may also understand. For example, the circle hypothesis theory, that is, the circle of crime: the distance of a straight line connecting the two most geographically distant cases in a series of homicide cases is the diameter, and the focus of the line is the center of the circle, forming a circle at a time.”

Su Hui's voice was a little low, and he talked eloquently, looking like a teacher who was teaching students, but now, all the criminal policemen who had worked in the serious crime team for several years were in front of him.

“…and the theory of environmental criminology, and the principle of foraging are some of the theories that underlie geographic profiling of crime. Crime only happens when the perpetrator and the potential victim are in the same place at the same time, and now we’re in In the era of big data, geographic information used by police should be combined with crime maps and applied in practice.”

In the conference room, everyone was attentively listening to Su Hui's explanation for a while, silently.

Although some of them have heard of these theories, they do not have such a deep understanding, and they have no experience in applying them to practice.

"Although the actual clues we have now won't allow us to find the murderer right away, we have already given us a lot of information..."

As he spoke, Su Hui tapped the three red dots on the picture with a pen, "These three places are the places where the murderer stored the stumps and handed them over to the client. According to the testimony, we can know that these places are the murderers. Selected."

Then he clicked the three yellow dots next to him: "These three places are the original work places of the waiters before they disappeared. We have already learned about these places, which means that the murderer has been to these places at some point in time. ."

Su Hui's mouse point, using these points as the center, draws several intersecting circles.

"Several geographic portrait modes commonly used in the world are: Rosmo mode, Kanter mode, and Caining mode. I use the police's GIS here. Based on this location information, we can optimize it according to the urban terrain, and we can deduce it. The following picture is to help us find the source of evil..."