The world is always full of impermanence, chance and unpredictability.

No one knows what tomorrow will bring.

Song Kun is an old man in the criminal police brigade of the high-tech zone and has led many criminal policemen.

And most of the people from the criminal investigation detachment also know each other.

Most of the criminal police at the scene of the crime, even if they had never seen Song Kun in person, had heard his name.

Maybe yesterday, or even early this morning, there are still people who envy Song Kun Mashan's retirement life.

However, what I saw today was only a cold corpse.

For many people in the criminal police brigade of the high-tech zone, this is a difficult scene to accept.

Although Qin Yong had already arrived at the scene in person, the main commander was Yuan Shaokang, the captain of the criminal police brigade of the high-tech zone.

Song Kun is his person after all, and this is another traffic accident.

The emotional impact of the case is great, but in fact, there is no need for criminal investigators to intervene.

It's just that now it involves the pursuit of the hit-and-run driver, which is a bit more complicated than ordinary traffic accidents.

However, with the current means, the vehicle basically did not run after a traffic accident caused a fatal person to escape.

It can definitely be found, and the dead person is a criminal policeman, and the traffic police detachment will definitely do its best.

Liu Guodong followed Lu Chuan's voice and walked over: "What did you find?" ”

Lao Liu's mood was also very heavy.

He also had the day of retirement.

But who can guarantee that they will live until then?

"Here, there are tire scorch marks."

Lu Chuan squatted on the ground and scraped the asphalt ground with tweezers, and his primary tire trace analysis skills allowed him to quickly determine the relevant information left by the scorch marks: "When the vehicle accelerates sharply, the tires rub against the ground, leaving rubber friction marks." ”

When Liu Guodong heard this, his head roared.

"Are you sure it's a tire trail left by the vehicle's acceleration?"

Lu Chuan nodded affirmatively: "The traces left by braking and the traces left by acceleration, because the direction of friction is just opposite, so the friction direction of tire tracks is also different." ”

Liu Guodong raised his head and followed a little trace on the ground to look at the impact point of Song Kun's car accident.

"You suspect not...... Accidentally? ”

Passing in this direction, the vehicle follows a straight line and reaches the point of impact.

"Ding!"

"Advanced Mission: Complete a qualified tire track analysis and uncover the truth about the death of criminal policeman Song Kun."

Lu Chuan picked up a small part of the scorch mark with tweezers, put it under his nose and sniffed it: "There is a possibility." ”

"The scorch marks smell strong and don't last more than three hours."

"And," Lu Chuan got up and pointed to the sandy land outside the curbstone: "The sand here has obvious traces of friction. ”

"It's supposed to be a 4x4 with grip on all four tires."

"Moreover, the tires have the same pattern and a similar level of wear."

"The traffic flow on Longjiang Road is not large, and the probability of two cars of the same model appearing in a short period of time is not high."

Opening the survey box he carried, Lu Chuan dipped a cotton swab into the rubber residue on the scorch marks: "I will go to the impact point to collect the rubber residue on the tire brake marks and do a comparative analysis of the composition." ”

"In conjunction with the pattern and pattern marks of the tires, you can determine whether the vehicle here is the vehicle that hit and killed Song Kun."

Lu Chuan's discovery made Liu Guodong realize the seriousness of the matter.

Traffic accidents and intentional homicide are not a thing.

Moreover, if Song Kun did not die because of a traffic accident, then who was going to deliberately kill a criminal police officer who was about to retire?

Is it because Song Kun has any case in his hands now?

What's the big deal?

Or did Song Kun arrest the people who came out to take revenge?

Or is there a grudge against whom he has a grudge in his own life?

Each possibility has different consequences.

Or rather, the world is different.

Death in a traffic accident is a natural and man-made disaster.

But if it is murdered, the cause is private reasons, and it is an ordinary homicide.

But if it is deliberately retaliated, then Song Kun is a martyr who died in the line of duty.

"Xiao Lu, you get the current survey here first, and I'll report to Team Qin."

Lu Chuan's face was fixed and he nodded.

Actually, when he first arrived at the scene, Lu Chuan didn't think about it so much.

It's just that because the traffic police were already measuring the tire track data near the impact point, he didn't step forward.

After all, there is a specialization in the art industry.

The traffic police have more experience in dealing with traffic accidents than in criminal investigation.

Therefore, Lu Chuan turned around the periphery at random, followed the direction of vehicle traffic, and walked a few steps up.

But unexpectedly, these details were discovered.

A minute later, Qin Yong ran to the corner of the road, along with Zhang Yongzhi, the head of the traffic police detachment.

"Lu Chuan, can you be sure?"

Lu Chuan, who has already collected rubber residues, is now taking pictures of tires.

"Team Qin," put down the camera, Lu Chuan opened the browsing window: "This is the pattern of the tire marks here, and the tire pattern left by the brake marks near the impact point should be the same." ”

On the asphalt road, although the brake marks of the vehicle are a pitch-black scorch marks, the depth of the scorch marks is slightly different because of the existence of the tire itself.

In the eyes of professionals, these shades are not traces, but they are actually the patterns of tires.

What's more, at the beginning and end of the traces, especially at the end of the brake marks, at the moment when the vehicle brakes to stop, the rubber residue left by the tire rubber due to high temperature friction will be extremely clear imprint on the tire tracks.

After receiving Lu Chuan's affirmative answer, Qin Yong's face was already extremely ugly.

Murder of the criminal police, also by camouflaging the scene of the car accident.

Who is so bold?!

"Any other clues?"

Lu Chuan nodded: "I just conducted a preliminary analysis of the tire tracks, judging from the color of the tire traces, the vehicle involved in the accident should be a passenger car, and the tire width is 265 through preliminary measurement, so it should be a tire used by large cars or off-road vehicles." ”

Seeing Qin Yong frowning, Lu Chuan continued to explain: "The tires of the vehicles all have certain specifications, and the specifications of the tires of passenger cars, engineering vehicles, and trucks are also different because of their different uses. ”

"Different specifications of tires, the rubber material is different, and the color of the burnt marks is different."

One of the main reasons why tire tracks can be used as judicial evidence is that the specifications of tires are fixed.

Typically, tires are differentiated according to the type of vehicle.

And there is a fixed English letter logo on the tire.

For example, the English letter PC stands for car tires, and private cars, whether they are ordinary cars or off-road vehicles, are basically used in this kind of tires.

LT is for light truck tires, TB is for truck and bus tires, AG is the symbol of agricultural vehicle tires, OTR is for construction vehicle tires, ID is for industrial vehicle tires, AC is aircraft tires, and MC is motorcycle tires.

Lu Chuan pointed to the tire tracks on the sand under his feet: "According to the distance between the starting front and rear tires, the measured wheelbase of the vehicle is 2850, and there are grip marks on all four wheels, which should be a four-wheel drive vehicle." ”

Lu Chuan pointed to Song Kun's body in the distance: "I just heard from the forensic doctor that Song Kun's body directly hit the waist and near the chest. ”

"Based on this height, the vehicle involved in the accident should be an off-road vehicle."

"The bumper fragments scattered on the road are white, so the preliminary judgment is that the car that caused the accident is a white four-wheel drive off-road vehicle."

Lu Chuan completely entered the state: "I don't know much about the model of the vehicle, but there should not be many kinds of off-road vehicles with a wheelbase of 2850, and we can roughly lock the vehicle brand." ”

Lu Chuan's thoughts became clearer and clearer, and his attention became more and more concentrated, not noticing how shocked Qin Yong and Zhang Yongzhi's expressions were now.