kvmb Chapter 769 Suspect Identified, Chen Jianguo's Shock
Chapter 769 Suspect Identified, Chen Jianguo's Shock
Qin Chuan began to explain.
"The footprints found at the crime scene indicate that two people committed the crime. One of the footprints is 26 centimeters long, which means that the other party was wearing a size 40 shoe. Another footprint is 29 centimeters long."
The paper Qin Chuan handed over contained a lot of calculation data. Chen Jianguo was originally a criminal police officer, so he could understand the calculation data on Qin Chuan's note. However, he didn't have experience as a criminal police officer conducting on-site investigations, so although he could understand it, he didn't know how the data was generated.
"Director Chen...this is footprint identification and analysis?!"
Chen Jianguo had no idea that the calculation data on the slips of paper Qin Chuan handed him were actually footprint identification analysis, and that it was far more detailed than any footprint identification analysis he had ever seen before.
Since the application of modern forensic techniques, footprint analysis has remained one of the most important investigative methods at criminal crime scenes. Fingerprint and footprint analysis, along with DNA testing, are arguably the most commonly used forensic techniques at criminal crime scenes. Among these, fingerprint and DNA testing are the most widely used, and both can serve as direct evidence to identify criminal suspects.
While footprint analysis is indeed an important criminal investigation tool, its application is relatively narrower compared to fingerprint and DNA testing. There are two main reasons for this. Firstly, footprint analysis is quite complex, and there are relatively few crime scene investigators proficient in it. Generally, footprint analysis is used after a suspect's arrest to verify if the footprints left at the scene belong to that suspect. In actual case investigations, footprint analysis data is rarely used to further investigate and apprehend suspects or narrow down the suspect pool. Furthermore, footprint analysis has several drawbacks. For example, if a suspect deliberately wears shoes that are too large or too small, it could disrupt the police investigation, ultimately doing more harm than good.
Chen Jianguo was surprised that Qin Chuan was so proficient in footprint identification and analysis, and that he had made so many data calculations based on some information in the photos.
"We have made a preliminary identification of these footprints, which you can use as a reference."
Qin Chuan continued to explain.
"Generally speaking, the length of an adult's foot is between 25 and 32 centimeters, and a person's height is usually about 6 times the length of their foot. The two footprints found at the crime scene were 26 centimeters and 29 centimeters respectively. Based on this, one of the suspects should be about 1 meters tall, and the other person should be about 75 meters tall."
"I just looked at the basic information about Li Guofeng that you put in the case file. Li Guofeng is 1.85 meters tall, so his foot length should be about 31 centimeters. This length is quite different from the length of the two unfamiliar footprints we found at the scene, so the possibility that the other party is a criminal suspect is very small."
The reason why the possibility of Li Guofeng being the suspect has been completely ruled out is that there is a relatively large difference between his height and the height inferred from the footprints found at the scene, a difference of nearly 10 centimeters. Therefore, this possibility is not very high. Although the relationship between a person's stride length and height is a direct proportionality of 6, this only applies to the vast majority of people. Some individuals may have a slightly larger or smaller value than 6, but it is unlikely to exceed 7, or it is only within the range of 5.
“所以你们现在的重点是要在4名死亡的被害人的人际关系调查中，身高在1米6左右的男性和1米75左右的男性当中。”
In fact, this height characteristic is relatively easy to spot because the footprints left at the scene are more likely to be left by men, and the proportion of men who are 1.6 meters tall is actually relatively small.
"Another point to note is that this suspect, who is 1.75 meters tall and has a foot length of 29 centimeters, has his left foot forward, which may indicate that his left foot has been injured and he may have a limp when walking. So pay attention to this point and focus on checking if there are any people like this."
As Chen Jianguo listened, his mind was in turmoil. Chen Jianguo was originally a criminal police officer. Although he didn't know much about crime scene investigation, he had some experience with it. In recent years, although he was in charge of traffic police and had less involvement in leading criminal investigation work, he still retained the basic qualities he had as a criminal police officer.
If it were just a matter of comparing the length and height of these footprints, he believed many people could do it too. But Lu Chuan was able to discover that one of the people in these footprints was somewhat lame, which was quite impressive.
Qin Chuan could see the shock in the other person's eyes.
He pulled out a photo and handed it to Chen Jianguo.
"This photo is the one I mentioned where the left foot is forward. Comparing this photo with other photos of footprints, the front half of the footprint is deeper, while the back half is relatively shallower. Normally, the center of gravity of a person's footprint is in the arch of the foot. That is to say, in the middle part of the footprint, the weight should be evenly distributed between the heel and the ball of the foot."
For example, the weight distribution on its right foot is relatively even, and the footprints in front and behind are quite clear. However, the left foot's footprints are noticeably clearer in front and behind, suggesting the opponent's weight is likely shifted forward. This is unusual; the opponent's foot or leg may have been injured. Pay close attention; you might find something.
Qin Chuan's current responsibilities extend far beyond this family annihilation case. His anti-drug efforts are also in full swing, targeting three major drug lords. Although they've been eliminated, some smaller drug trafficking groups remain active, and they've largely received intelligence and are preparing to flee. Qin Chuan isn't going to let these people go. For anti-drug operations, success means arresting everyone in the chain and dismantling the entire supply chain. If people escape, they can simply return.
Unlike Erguotou, where only one person escaped, the other henchmen and channels have been shut down. Even if he returns, it's impossible for him to rebuild an effective network in the short term. Moreover, Qin Chuan has already made arrangements. The operation to apprehend Erguotou has also begun overseas, but the details still need to be confirmed by the provincial department. After all, applying for an arrest overseas is not something a municipal bureau can decide on its own.