Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 420 Narrowing the Scope
For example, is it possible that several other people went to the bun shop owned by Corpse No. [-] to eat buns?
For example, is it possible for these people to patronize the massage parlor where No. [-] once worked?
Or go to the street stall on No. [-] to repair your bicycle?

Or maybe he's a taxi number [-]. It's been so long, no one can tell.

Of course, it doesn’t matter whether these people have space to hand over whether they say it is important or not.

The important thing is that in many past homicide cases where multiple people died, the relationship between the victims could be used to identify their common contacts, thereby solving the case.

To say it is not important requires specific cases and specific analysis.

For example, in the current case, the five corpses were all engaged in jobs with a strong foundation in Kazuto, so it is entirely possible that the murderer was only familiar with the other person.

"I have an idea……"

After Wang Song reported the basic situation, he talked about a case.

"Twelve years ago, our bureau handled a case. The murderer killed three people and buried them in the backyard of his house."

"In fact, he was not particularly familiar with the three people who were killed, and there was no deep hatred between them. It was just because of some temporary verbal conflicts that he killed them in a moment of excitement."

"The current case... I wonder if there is a similar possibility?"

"The murderer did not actually kill for any particularly strong motive. It just happened to happen, or did it stimulate a certain stress response point of the deceased?"

Wang Song’s idea...

Li Donglin agrees. I can't say that this is definitely the case, but now it seems that it is possible.

"Lu Chuan, have you discovered anything?"

Lu Chuan had assisted, or rather led, the identification and analysis of several corpses in the past few days, especially making a huge contribution in determining the origin and identity of the corpses.

It can be said that now everyone has so many possibilities for conjecture and the basic direction of on-site visits and investigations. The most fundamental reason is to determine the identity of the corpse.

After three or five days, Lu Chuan did more than just that. He also had a more important job.

Trace evidence analysis.

"I collected trace evidence from all five boxes. This morning, Haizhou City just sent the analysis results."

Although Tianzhou City has relatively advanced criminal investigation equipment, it is compared to the criminal investigation detachments of other municipal bureaus.

From the perspective of hardware conditions alone, the Haizhou City Criminal Investigation Detachment is now beating all municipal bureaus to protect the provincial capital.

Spend [-] million, but not every detachment has such a large donor.

Therefore, there are only two trace evidence identification and analysis laboratories in the whole body, one in the provincial department and one in the Haizhou City Criminal Investigation Detachment.

Yang Sen worked overtime for three days to complete the appraisal of all the things Lu Chuan sent back.

Liu Guodong and Lao Bai actually wanted to switch classes with him, but their son's college entrance examination was over, and Yang Sen wouldn't go home if he could.

What are you going to do when you go back, cooking?

mop?

do the laundry?
scolded?

Forget it, there's no place to go to smoke, so it's nice to work overtime at work.

A middle-aged man can be regarded as a good man if he is no longer tied by children and can still maintain the continuation of his marriage.

"The boxes containing corpses have different shapes. I checked the brands of the boxes in the past few days. They are basically fake goods and can be easily bought in the market."

"But the quality is good. Several boxes are made of genuine leather. This should have been specially prepared by the murderer to prevent the river water from soaking, causing the boxes to rot and the bones inside to leak out."

Li Donglin nodded. This clue mainly came from the material of the box...genuine leather.

These days, there are many people selling boxes, but few selling genuine leather boxes.But so far, there are no valuable clues.

There are as many as eight hundred merchants selling genuine leather boxes in Tianzhou City, ranging from one thousand to eight hundred.

"The key is the sediment in the box."

The trace evidence analysis that Lu Chuan asked Haizhou City to do showed that the main substance was the sediment in the box.

"Although the box is better sealed, some river sand still invades the inside of the box after being soaked for a long time."

On the projector is a trace evidence analysis report.

The sediment collected by Lu Chuan has the same material composition as the sediment on the Wangjia River bed.

The composition of soil is very complex, including various particles, organic matter, minerals, moisture, air, microorganisms, etc.

Soils in different regions have obvious regional characteristics.

For example, the soil in some places is clay, which can be used to bake ceramics, the soil in some places is sandy soil, which has good air permeability, and the soil in some places is black soil, which contains a large amount of microbial minerals and is suitable for crop growth.

Moreover, soil colors vary greatly in different regions, such as loess, black soil, red soil, cinnamon soil, etc.

"In addition to the sediment on the Wangjia River bed, there are two other discoveries."

On the projector, there are five corpse box numbers.

"We found a relatively sticky soil in boxes [-], [-] and [-]."

"Inside boxes three and four, another sandy soil material was found."

When Lu Chuan reported, Li Donglin's expression was extremely solemn.

This information was just sent this morning, and Li Donglin just heard it.

"Divided into two places?"

The criminal police officers present were all members of the serious crime team selected by the provincial department, and none of them were working for a living.

As soon as Lu Chuan's analysis results came out, everyone knew what it meant.

Corpses No. [-], [-] and [-] were killed within a year and a half, eight months, one year and three months and two months respectively.

As for corpses No. 14 and [-], they were killed very long ago, one was eight years ago and the other was [-] years ago.

Lu Chuan nodded at Song Mingguang's words: "We have contacted the Tianzhou City Geology Department about the soil in the two places, and we should be able to compare the origin of the soil soon."

The geological department of any place has conducted a thorough analysis of the soil in their area decades ago.

Of course, this smallest unit is divided into towns, unless there are special terrains such as mountains, lakes, and hills.

"This result... the murderer must have had the experience of moving, right?"

He most likely lived in the same place when he killed bodies No. [-] and [-], but when he recently killed victims No. [-], [-], and [-], his living place changed.

This can explain why the composition of the soil in the box changes.

"in addition……"

Lu Chuan switched the projection, and what appeared was a map of villages and towns in the nearby area.

"The five people who were killed, the area where they lived... was a little strange..."

On the projected map, five red dots lit up one after another, marking the specific geographical locations of the five victims when they disappeared.

(End of this chapter)