Chapter 80 Four Groups of Tire Marks
Since the incident, the site survey office has always been the aspect that Qin Yong is most concerned about.
Although the wreckage of the burned vehicle cannot be inspected now, Lu Chuan found some footprints and tire marks at the scene, and Qin Yong was very concerned about it.
In the past half of the night, Qin Yong wanted to go upstairs to the site survey office several times.
But he held back.
He knew that the current survey team must be busy doing analysis, and there would be no use except wasting time.
It may even bring pressure to the current exploration, and if some mistakes are made, the gain will outweigh the loss.
I glanced at the quartz clock on the wall, it was nine fifty-eight.
The speed is not slow.
Liu Guodong quickly walked to the front of the conference table and handed the footprint identification and analysis report to Qin Yong: "The footprints found at the scene, excluding our people, there are two sets of unfamiliar footprints."
"This is the analysis report made by Xiao Lu."
Lu Chuan!
It’s Lu Chuan again.
Qin Yong let out a long breath.
In the past, the Haizhou Criminal Investigation Detachment was unable to conduct footprint analysis by itself.
Except for some basic information such as male and female, height, etc., nothing else can be determined.
Furthermore, this bit of information cannot be said to be highly accurate.
In the past, either the technical appraisal center of the provincial department was asked for help, or the criminal investigation detachment next door was asked for help.
But there are few experts in this field.
Although the Tianzhou City Criminal Investigation Detachment's trace inspection is better than Liu Guodong's, it is only as good as it is.
As for the provincial department...
If you have a murder case, others will also have a murder case.
There is no other way but to line up.
How can it be so convenient for my own people to use.
Taking the analysis report with a little excitement and emotion, Qin Yong's expression was slightly startled: "A man and a woman?"
Results of the first report: Male, 1.76 meters tall, weighing about 70 kilograms, aged between 32 and 37 years old, with a slight walking posture.
The results of the second report: Female, 1.65 meters tall, weighing about 50 kilograms, aged between 25 and 30 years old, most likely to have undergone posture training, heavy heels, long-term wear High heel.
Two reports, one male and one female.
It is very rare for two people to commit intentional homicide.
Killing is not a game of cards and cannot be done by one person.
It is very rare for two people to commit murder, especially a premeditated murder.
Among the homicide cases that Qin Yong has been exposed to, crimes of passion often involve multiple people committing crimes together.
For example, a fight, where multiple people beat each other and resulted in death.
It is extremely rare for multiple people to premeditate a crime.
It is even less so if a man and a woman committed the crime.
"How accurate are these two reports...?"
Of course, Qin Yong asked the same question Liu Guodong just raised in the current exploration laboratory.
“The accuracy of the male footprint analysis report is 90%, and the accuracy of the female suspect’s footprint analysis report is 70%.”
90%?
Seventy percent!
This accuracy rate is not low.
One man and one woman. With this scope, Ren Qiang and the others will be more targeted in their investigation.
Furthermore, judging from their age, if they were seeking revenge on Song Kun, then these two or one of them should have been arrested by Song Kun in recent years.
Of course, it cannot be ruled out that the child of a criminal committed the crime, but this possibility is very small.
Basically it can be ignored.
In the current survey laboratory, Lu Chuan and Lao Bai lit cigarettes and were taking a rest.
After being busy for half a night, Lu Chuan felt a little dizzy.
There is no need to go to the traffic police detachment anymore. After all, the vehicle responsible for the accident has been found, and there is no need to analyze the wheel marks at the crime scene. Now, what Lu Chuan needs to do is to identify and analyze the tire marks found on the road where the car was abandoned in the ravine.
The Ford Everest, the vehicle involved in the accident, has been confirmed to have been stolen by the murderer.
But the same cannot be said for their escape vehicle.
"Brother Bai, who is following the vehicle theft side?"
"Sun Jun, a group is watching, but I haven't heard of any progress."
>Lao Bai took the last puff of his cigarette and blew out a big smoke ring: "The other party came prepared. He stole the car to fake a car accident, and then burned the car to destroy the traces. This is not something ordinary people can do."
Yang Sen nodded in approval: "The methods of these two people are a bit professional."
No matter what industry, there is really a difference between professionals and non-professional officers.
I won’t talk about the techniques, I can’t even understand the professional vocabulary.
No one who is not a professional will understand what ants are climbing up a tree, old trees are packed with roots, and they are like a pillar of strength.
Lu Chuan wiped out the cigarette butt and gave Yang Sen another cigarette: "Brother Yang, you mean... the killer?"
These days, in Haizhou City, there are Killer exists?
In the current environment, this kind of profession is as rare as Wan-style service.
"It's not necessarily a professional killer. Killers are rare here. I can only say that they probably have more than one life on their hands..."
The work cannot stop. .
The three chatted for a while and then returned to work.
Of course, Lu Chuan is still the main force, Yang Sen and Lao Bai will not be able to help much.
Four sets of tire marks were collected by Lu Chuan on the road that turned into the ravine.
The four sets of tires are partially superimposed and rolled. Before analysis, the tire mark pictures must first be processed.
Tire width measurement, comparative data of edge tire marks, analysis of tire aspect ratio, measurement of tread wear depth, determination of tire service life, etc.
It is different from the tire marks that can be collected at the impact site.
Tire marks on ordinary roads do not contain tire rubber residue.
In other words, there is very little residue, which makes it difficult to analyze the tire composition.
But the type of tire can be determined based on the pattern shape.
It can also determine the vehicle's driving speed at that time based on the spacing of the patterns.
This has something to do with the elasticity of the tire. There is a difference in size between a stationary tire and a moving tire.
Due to the influence of elasticity and inertia, running tires are wider than stationary tires.
And the faster the vehicle, the greater the difference.
Using this difference and applying formula calculations, we can roughly determine the speed of the vehicle.
Of course, the accuracy of this judgment is not high, because the deformation of the tire is also affected by temperature.
Pavements of different materials will also have an impact on it.
So, we can only estimate a range that can be used as a reference.
With elementary tire mark identification skills, the data that can be analyzed is still limited.
It took Lu Chuan more than two hours just to separate and overlap the four sets of tires.
When a murder of this level occurs, there will be no one left in the entire criminal investigation detachment.
Even those who engage in publicity are very busy now, monitoring public opinion on the Internet at all times to prevent an uncontrollable situation.
The union elites who usually sing and dance are not off work now.
I am preparing gifts to go to the front line to express condolences tomorrow, and I also need to take photos to keep them.
On the forensic side, it was a little more relaxed.
The cause of Song Kun's death was determined. After consulting his family members, no autopsy was performed.
Autopsy is actually different from what most people imagine.
It does not mean that if there is a murder case, an autopsy must be performed.
Only in some cases where the cause of death is uncertain or the time of death is uncertain, an autopsy will be performed after obtaining the consent of the family of the corpse.
Of course, if the family of the unknown corpse cannot be found, it must be dissected.
At 3:30 in the middle of the night, the four sets of tire mark analysis were finally completed.
(End of this chapter)