Chapter 180 Group Investigation

Click.

The projection switches.

There are two sets of tire marks.

"We collected two sets of tire marks at the scene."

"The first set of tire marks is the tire marks of the tricycle."

"We compared the tricycle of Wang Fugui and his wife and can confirm that the tire marks of the tricycle are theirs."

"The other set of tire marks is strange."

"Everyone, look at the screen..."

Click, the projection switches.

There are four tire marks on it.

"Of the four tire marks, the two in the middle are consistent, but the two on the sides are inconsistent."

"Team leader Chen, this is basically the general situation at the scene."

Chen Yan nodded.

He stood up and walked to the whiteboard.

"Based on the information we have so far, we first need to confirm the identity of the deceased."

"Judging from the extent of the body damage, the murderer either had a deep hatred for the deceased, or deliberately damaged the body to mislead our investigation."

"Now, let me arrange the next stage of work."

"Captain Zhao, please take a moment to divide all the detectives of the fourth detective team into five groups to follow up on my next deployment."

Zhao Haiyang stood up and saluted: "Yes, Team Leader Chen"

"Group one, responsible for tracing the origin of the necklace on the neck of the deceased."

Click.

The screen was switched to a photo of the necklace on the neck of the deceased's body.

"This necklace is the only thing on the body of the deceased."

"The necklace is made of gold, and there is a brand logo here."

"The first group is responsible for finding the origin of this necklace, who bought it and where it was bought from."

"When the murderer killed the deceased, it is impossible that he did not notice the existence of this necklace."

"However, he still kept the necklace, which means that the possibility of the other party being after money is relatively small, and the possibility of revenge or love killing is relatively high."

"If we find the necklace, it is possible to confirm the identity of the deceased."

"The second group will visit various plastic surgery hospitals in Shenyang."

Click.

The projection screen switched again: "Everyone, look here, the nose of the deceased was cut off by a sharp blade."

"The nasal bone is exposed, but there are traces of friction on the nose bone of the deceased. From this point of view, the deceased should have had a nose plastic surgery before his death."

"Track down on all hospitals in Shen City that can perform nose plastic surgery to see if the identity of the deceased can be found."

"At the same time, the third group will follow up on the situation of the deceased's broken fingers on his feet. Judging from the scars on the deceased's toes, it seems that he had an operation in his early years. In major hospitals, check all people who have had the fourth toe amputation surgery to verify their identities."

"The fourth group... trace the origin of the thorns in the body of the deceased."

The projection screen switched again.

"This kind of thorn branch is a common wild thorn bush, but because of its thorns, even in rural areas, most people will not collect it for burning."

"So, when there is nothing to do, no one will collect this kind of thing."

"Check where there is this kind of thorn bush near the place where the body was dumped."

In fact, from Chen Yan's judgment, the fatal injury of the deceased should be that the thorn branch stabbed him and he bled to death.

The murderer was so cruel, what hatred did he have with the deceased?

In addition, there were crisscrossing whip marks on the body of the deceased, some new and some old.

This shows that the deceased was probably bullied for a long time before his death.

When it comes to the investigation of thorn branches, many detectives look unhappy.

This kind of brutal crime scene is extremely rare.

The murderer's behavior can be described as perverted.

"Team Five, focus on tracking tire marks."

Chen Yan sorted out his thoughts and continued to deploy work: "On the one hand, we need to check the tricycle of the reporter Wang Fugui and his wife."

"Including whether there is friction between the iron cage and the box in the car, and whether the tire marks match the scene under different load-bearing conditions of the tricycle."

Although Wang Fugui and his wife were the reporters, there was no surveillance at the time, and the two of them were also suspected of committing the crime.

Therefore, we need to check the tricycle they used.

On the one hand, if they are crying thief, then they should use the iron dragon transported by the tricycle.

Then, during transportation, the iron cage is bound to come into contact with the box of the tricycle.

In this way, it is easier to find some clues.

On the other hand, even if the other party has been prepared, such as using quilts to wrap the cage to avoid bumps.

However, the weight of the iron cage plus the deceased is at least 150 kilograms.

In this case, the tire marks of the tricycle when it was carrying 150 kg must be different from those when it was carrying only Wang Fugui and his wife.

"There is a second set of tire marks."

Click.

The screen was switched, and Chen Yan pointed to the second set of tire marks: "In this set of tire marks, the two middle tire marks are the same, which should be the tire marks of the motorcycle."

"The two sides are different tire marks, but the depth of the indentation is basically the same."

"So, it is very likely that it is a motorcycle pulling a cart, and the tires on both sides of the cart are not the same."

This is easy to explain.

If one side of the tire of the cart is severely worn, it is also possible to replace a tire with a different pattern.

After all, the carts are pushed by manpower.

The speed is not fast, even if the tire patterns on both sides are inconsistent, it will not cause rollover.

After the five tasks were arranged, everyone took the order and left.

In the conference room, there were only Chen Yan and Zhao Haiyang.

This case is somewhat unusual.

The murderer's ruthlessness far exceeded Chen Yan's imagination.

His technique is even a bit perverted.

The whip marks on the body of the deceased also indicate that the deceased may have been bullied frequently during his lifetime.

However, this person loves beauty very much, otherwise, he would not undergo nose plastic surgery.

There are also iron cages.

Where the lock should have been, it has been welded.

Judging from the welding traces, it should be the situation in the past few days.

However, is welding something that ordinary people can have access to?

Chen Yan looked at Zhao Haiyang: "Captain Zhao, we are still dividing a group of people to follow up on all the welding shops within a hundred kilometers of the place where the body was dumped."

"The other party can weld the iron cage to death, so he must have welding equipment."

"Most people don't have this kind of thing."

Zhao Haiyang nodded: "Okay, I'll make arrangements right away."

After leaving the conference room, Zhao Haiyang arranged the work intensively.

…

afternoon.

The first to return the message was the fifth group of people.

"Team Leader Chen, the inspection results of Wang Fugui and his wife's tricycle are out."

Click, screencasting is enabled.

"We inspected Wang Fugui's tricycle and found no relevant bump marks on the box."

"At the same time, we compared the tire indentation depth of the tricycles."

"It is consistent with the situation that the tricycle was carrying Wang Fugui and her wife."

Chen Yan nodded: "In other words, the possibility of Wang Fugui and his wife using a tricycle to transport the iron cage is basically ruled out?"

The leader of the fifth group nodded: "That's true."

"Moreover, Wang Fugui and his wife are still in shock."

"When we went to visit, both of them were a little stumbling when talking."

"Obviously still recovering from the shock caused today."

Indeed, when I went to net fish early in the morning, a corpse came to the net.

Moreover, the body was brutally damaged...

"How was the investigation of the other set of car marks?"

"The investigation results of this set of car marks have made great progress."

"In the afternoon, we simulated the scene of a motorcycle and a trolley on site."

"At the same time, a driver drove a motorcycle and put the weight of the iron cage and the body into a small cart..."

“It turned out that compared with the marks on site, the indentation was a bit shallow!”

Shallow indentation?

What's the meaning?

Shallow indentations mean that the load capacity of the stroller or motorcycle is insufficient.

What causes this?

This kind of simulation cannot be done by just finding a cart.

Vehicle marks reveal much more information than imagined.

First of all, it is the tire pressure. No matter how the load changes, the normal tire pressure can be inferred from the tire marks.

Because the load capacity changes, the tire contact area increases.

This increase in area has two aspects. One is that the tire sidewall contacts the ground, and the other is the tire landing point. The front and rear ground contact areas increase.

Through model calculations, there is a fixed calculation method for the front, rear and sidewall contact areas of tires with different load capacities.

This is tire mark analysis.

In fact, it is a science.

At present, this method is very mature.

So there are only two reasons for this problem.

Chen Yan frowned slightly and looked at the person in charge of the fifth team: "You mean... the person who dumped the body was a very fat man... or that the person who dumped the body was not the same person?"