Since the incident, the investigation office has always been a link that Qin Yong is most concerned about.

Although the wreckage of the burned vehicle cannot be surveyed now, Lu Chuan found some footprints and tire tracks at the scene, and Qin Yong was very concerned.

In the past half night, Qin Yong wanted to go upstairs several times to have a look at the current survey office.

But he held back.

He knew that the current survey must be busy doing analysis, and it was useless to remove the delay by himself.

It may even bring pressure to the current survey, and if some mistakes are made, it will be more than worth the loss.

Glancing at the quartz clock on the wall, it was nine fifty-eight.

It's not slow.

Liu Guodong walked quickly to the front of the conference table and handed the footprint identification and analysis report in his hand to Qin Yong: "The footprints found at the scene, excluding our people, there are two sets of unfamiliar footprints. ”

"This is an analysis report made by Xiao Lu."

Lu!

It's Lu Chuan again.

Qin Yong let out a long breath.

In the past, the Haizhou Criminal Investigation Detachment had no way to do footprint analysis on its own.

Except for some basic information such as men and women, height, etc., nothing else can be done.

Moreover, this information cannot be said to have a high accuracy rate.

In the past, it was either to ask the technical appraisal center of the provincial department for help, or to ask the criminal investigation detachment next door for help.

But there are few experts in this area.

Although the trace inspection of the Tianzhou City Criminal Investigation Detachment is stronger than Liu Guodong, the strength is limited.

As for the provincial department......

You have a homicide, and someone else has a homicide.

There is no other way but to queue up.

How can someone like himself use it so conveniently.

Slightly excited and a little emotionally took over the analysis report, Qin Yong's expression was slightly stunned: "A man and a woman? ”

The results of the first report: male, 1.76 meters tall, weighing about 70 kilograms, aged between 32 and 37 years old, walking posture is small and slight.

The results of the second report: female, 1.65 meters tall, weighing about 50 kilograms, aged between 25 and 30 years old, most likely undergoing posture training, heavy heels, and wearing high heels for a long time.

Two reports, one male and one female.

Intentional homicide, or two people committing the crime, is very rare.

Killing people is not playing cards, and one person can't do it.

It is very rare for two people to kill, especially a planned premeditated murder.

Among the homicide cases that Qin Yong has been exposed to, there are more cases of multiple people committing crimes together under crimes of passion.

For example, in a fight, where multiple people beat each other and cause death.

It is extremely rare for multiple people to commit a crime in a premeditated manner.

Not to mention that if a man and a woman commit a crime, there are even fewer of them.

"The accuracy of these two reports ...... How many? ”

Of course, Qin Yong raised the same question that Liu Guodong had just raised in the field survey laboratory.

"The accuracy of the male footprint analysis report is 90%, and the female suspect footprint analysis report is 70%."

Ninety percent?

Seventy percent!

This accuracy rate is not low.

One man and one woman, with this range, Ren Qiang's investigation will be more targeted.

Moreover, judging from age, if they are taking revenge on Song Kun, then these two or one of them should have been caught by Song Kun in recent years.

Of course, it cannot be ruled out which criminal's child committed the crime, but this possibility is very small.

Basically negligible.

In the current laboratory, Lu Chuan and Lao Bai lit cigarettes and were resting.

After being busy for half a night, Lu Chuan felt a little dizzy.

There is no need to go to the traffic police detachment, after all, the vehicle that caused the accident has been found, and it is no longer necessary to analyze the wheel traces at the scene of the crime.

Now, what Lu Chuan needs to do is to identify and analyze the tire tracks found on the road to the abandoned car ravine.

The vehicle that caused the accident, the Ford Shaker, has been confirmed to be stolen by the murderer.

But the vehicle they fled from was not necessarily.

"Brother Bai, who is following the vehicle theft?"

"Sun Jun, a group is staring, but I haven't heard of any progress."

Lao Bai took the last puff of cigarette and spit out a big smoke ring: "The other party came prepared, stole the car and faked the car accident, and then burned the car to destroy the traces, which is not something that ordinary people can do." ”

Yang Sen nodded approvingly: "The methods of these two people are a bit of a professional. ”

Regardless of the industry, there is really a difference between professional and non-professional officers.

I won't talk about skills or anything, and I don't understand the technical vocabulary.

What ants go up the tree, the old tree is entrenched, and the optimus is a pillar, and those who are not professionals don't understand what it means.

Lu Chuan extinguished the cigarette butt and refilled Yang Sen with another Huazi: "Brother Yang, what do you mean...... Killer? ”

In these years, in Haizhou City, there are still killers?

In the current environment, this kind of profession is as rare as Guan-style service.

"It's not necessarily a professional killer, why are killers here, killers are rare, it can only be said that they have more than one life in their hands......"

Work can't be stopped.

The three of them chatted for a while, then went back to work.

Of course, Lu Chuan is still the main force, and Yang Sen and Lao Bai will not be able to help.

The four sets of tire tracks were collected by Lu Chuan on the road that turned into a ravine.

Four groups of tires, some of which are superimposed and rolled, are first analyzed by processing the tire track pictures.

Tire width measurement, comparative data of edge tire tracks, analysis of tire flat ratio, measurement of tread wear depth, judgment of tire age, etc.

It is different from the tire tracks that can be collected at the site of the impact.

Tire tracks on ordinary roads, and no tire rubber residue.

Or that there is very little residue, which makes it difficult to analyze the tire composition.

However, depending on the shape of the tread, it is possible to determine the type of tire.

It is also possible to determine the speed of the vehicle at the time based on the spacing of the patterns.

This is related to the elasticity of the tire, and there is a difference between the size of the tire in the stationary state and the tire in the moving state.

Due to the influence of elasticity and inertia, the running tires are wider than the stationary tires.

And the faster the vehicle, the greater the difference.

Using this difference, you can use the formula to calculate 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 the temperature.

Different materials of pavement will also have an impact on it.

Therefore, only one range can be estimated.

There is still a limit to the data that can be analyzed for the primary tire track identification skills.

Four sets of tires, Lu Chuan just separated the traces of superposition, it took more than two hours.

In the event of a homicide of this level, there will be no idlers in the entire criminal investigation detachment.

Even those who engage in propaganda are now very busy, always monitoring public opinion on the Internet to prevent an uncontrollable situation.

The trade union elites who sang and danced on weekdays are not off work now.

I am preparing to go to the front line tomorrow to pay condolences, and I will take pictures for keeping.

On the forensic side, it's a little easier.

The cause of Song Kun's death was confirmed, and after soliciting the opinions of his family, an autopsy was not done.

Autopsy, in fact, is different from what most people imagine.

It doesn't mean that if there is a homicide, it must be autopsied.

An autopsy will only be performed in some cases, such as the cause of death is uncertain, the time of death is uncertain, and the consent of the family of the corpse is sought.

Of course, the nameless corpse could not be found by the family, and it must be autopsied.

At half past three in the second half of the night, the analysis of four sets of tire tracks was finally completed.