Everyone knew that there must be a difference, otherwise Lu Chuan would not show it, but they really couldn't tell, and it felt like it was similar to other photos.
“There is a difference. The front and rear centers of gravity in these photos are very different from those of other footprints. The center of gravity is toward the front and rear heels and the force is lighter, while the front foot pointing force is heavier.”
Otherwise, I know that everyone hasn’t done much research on footprint identification and analysis, so I didn’t give it away. Then I talked about some reasons for this situation.
"Generally speaking, only people who wear high heels for a long time will develop such a habit."
"High heels?"
"Yes, they are high heels. For people who have worn high heels for a long time, the center of gravity of their feet is slightly different from the center of gravity of ordinary people who have not worn high heels. And you can try it yourself. For ordinary adult men, the power of the forefoot is Relatively weak. "
"Only people who have worn high heels for a long time or have practiced ballet and other dances will have the ability to support the entire body's center of gravity with the sole of their feet."
This is it. Lu Chuan's judgment about the footprints and the possible behavioral habits of the murderer was a professional judgment.
In fact, from a probabilistic perspective, when it comes to identifying and analyzing footprints, there are quite different patterns between male footprints and female footprints.
Generally speaking, the size of male footprints is concentrated above size 40. Generally, size 44 to size 45 is a relatively concentrated range.
In this range, codes 42 to 43 are a relatively more concentrated range.
The size of women's footprints is mostly concentrated between size 36 and size 40.
Among them, the three numbers 38 and 39 are relatively concentrated.
In addition, there are also differences in gait between male footprints and female footprints, and there are also certain regular differences between strides and steps.
However, this is just a regular understanding.
Some men are born with a female aspect, and some women are born with a male aspect.
Therefore, footprint identification can only assist in confirming the gender, but cannot be used as a decisive factor.
It’s just that judging from the on-site investigation, the possibility of the murderer being a woman is slightly higher.
However, what Lu Chuan said seemed to confirm the reason why the murderer was poisoned.
The deceased was an adult male, and if the murderer was a female, the possibility of causing the death of the other party through fighting or other methods is indeed unlikely, but if the other party poisoned the other party, the possibility of causing the death of the other party was very high. .
"In addition, I found a set of wheel tire marks in the yard of the waste logistics park where the crime occurred."
After reporting on the footprints on this side of the road, they began to report on the tire marks in the yard. Exploration situation.
“Let’s talk about the tire brand first.”
Lu Chuan flipped the projection, and four sets of photos appeared.
“All four tires are Continental’s silent tires. These tires are rarely installed on initial vehicles. I checked and found that only four BMW sedans from three years ago have used these tires. kind of tires.”
Then Lu Chuan projected the relevant car brands in front of everyone.
Then he added: "Compared with the tire marks of the other three tires, the tire mark on the right front wheel has much less wear. It is basically about one-fifth of the wear of the other tire marks. . ”
“Although the sales cycle of these cars is relatively long, only the production batches of three years ago use this type of tire.” “None of the subsequent cars used it. It has silent tires from Continental, so the car the murderer drove must have been purchased three years ago."
Compared with the clues found on the footprints, Lu Chuan actually felt that he was in trouble. The clues found on the tires are even more worthwhile. It would be easier for the front-end criminal police to pay attention to this clue and track it down.
Lu Chuan then analyzed: "Judging from the number of kilometers of tire wear, the mileage of this car should be between 30,000 and 40,000 kilometers."
However, the blooming of different tires with different kilometers of driving The traces are quite obvious, and Lu Chuan can usually judge them more accurately when doing tire mark analysis.
“The wear marks of the tire on the right front wheel are only about 1/5 compared to the other three tires, which means that this tire should have been replaced later.”
"There is only one possibility of replacing one tire after another. This tire had a puncture before, so there was no way to replace it with a new tire. And according to the difference between the mileage and wear of the vehicle, plus this car Based on the time of purchase of the car, it can be determined that the replacement time of this tire should be in May or June this year.”
Lu Chuan continued to report: “Of course, the premise for making this judgment is that the mileage of the vehicle is relatively high. Evenly, of course, it does not rule out that this car has not been driven this year, but it has driven a lot of kilometers last year. In this case, it may also have the situation I mentioned.”
Probability.
The limited investigations and analyzes that Lu Chuan is currently doing are only based on some traces of the scene, some data, experience and technical judgments. He has not been to the scene to see these things in person, so All analysis is probabilistic.
The report is being made on the side of the road. Others are listening very seriously and observing some information on Lu Chuan’s ppt.
It can be said that some analysis of vehicle tire marks makes everyone feel very excited.
The reasons are as follows.
The first is the specificity of this tire, which can lock the car model to a certain year, which makes it easier for everyone to investigate vehicles of a certain year. Although a lot of them were sold, if they were concentrated in Haizhou City, there might not be that many.
The second thing is that the right front wheel of this car has a puncture.
In this case, as long as we check the sales records of this kind of Continental tires in Haizhou City in the past year, let alone May or June, we should still be able to find some clues.
The third is that the brand of the vehicle has been determined. In this way, some investigations can be done in the monitoring of the roads around the waste logistics park and all the videos of the relevant vehicles can be found. Then there may be more Found some clues.
Compared to people, it is much easier to investigate vehicles than people. After all, vehicles are relatively large and have license plate numbers.
"Very good, Lu Chuan, do you have anything else to say?"
Li Donglin was very pleased that Lu Chuan had achieved so much work in one night and found so many clues.
"Li Chu, no more for now."
"Okay, Wang Song, how is the situation here?"
Li Donglin turned his head and looked at the others .
Wang Song is responsible for investigating the identity of the deceased.
“We have some clues.” Wang Song stood up and took the projector operating pen, “Just two hours ago, Lu Chuan sent us the relevant DNA information of the deceased. We made a comparison among the missing persons."
"Finally found something."(End of this chapter)