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

The on-site investigation at the landfill lasted less than an hour, and the serious crime team members retreated one after another.

In Conference Room No. 2 of the Dongzhou City Criminal Investigation Detachment, Li Donglin is organizing a meeting of the serious crime team members.

"My suggestion is to start investigating Zhu Panpan's interpersonal relationships."

During the meeting, members of the serious crime squad began to express their opinions on the direction of the investigation of this case.

"I carefully studied the files of the 10 murders committed by the Red Killer and found a common detail."

Since receiving this task, the members of the serious crime team, including Wang Song, Lu Chuan and others, began to study the files of the Red Killer's previous murders.

Wang Song discovered a rather unique clue.

"In addition to the fact that all the victims wore red clothes, another clue is the occupational characteristics of these victims. All of them were in places with a large number of people."

Having said that, Wang Song began to list the occupational characteristics of several victims.

"15 years ago, the first victim worked in a battery factory, the second victim worked in a supermarket, and the third victim worked in a farmers' market..."

"15 years later, the victim again worked in a supermarket. These places are crowded with people and have a high turnover of people."

The police have made many assumptions about the identity of the Red Killer.

First of all, is there any connection between the Red Killer and these victims?

Do they know each other?
Is there a possibility of intersection in interpersonal relationships?
Psychological experts sent by the provincial department and many veteran criminal police believed that the suspect and the victim must have known each other.

In other words, there is a possibility of intersection of interpersonal relationships.

"I personally think that there must be some connection between the victim and the murderer. If we investigate the victim's interpersonal relationships, the possibility will be greater."

Wang Song felt that the victim and the suspect should know each other, but they were not very familiar with each other.

Because they had previously investigated whether the interpersonal relationships of the 10 victims had any common intersections, but no major clues were found.

Wang Song believes that the relationship between the suspect and the victim is relatively weak.

"To be precise, I think the relationship between them is the kind of familiarity where they don't have any contact information but know each other's name."

"I personally suggest that we investigate this aspect among Zhu Panpan's interpersonal relationships, especially among his colleagues in the supermarket."

"In addition, I suggest collecting DNA information from all 593 suspects in the Jianguo Road South Second Lane where the finger was found."

After listening to this, Li Donglin looked at Song Mingguang.

"Old Song, what do you think?"

"My idea is similar to Wang Song's. We need to collect DNA information from all suspects and then compare it with the DNA in the body fluids found in the victim's body."

Song Mingguang went on to say: "In addition, I suggest that we expand the search range, especially to the landfill. Although there are no surveillance cameras inside the garbage plant, there are surveillance cameras on the road leading to the landfill. We need to retrieve these surveillance cameras on a large scale."

"Based on the current clues, the murderer should have abandoned the body between the evening of the fourth day of the Chinese New Year and the day of the fifth day of the Chinese New Year."

There are people picking up garbage in the landfill every day. The body in red was found during the day on the fifth day of the Lunar New Year, and someone also went into the landfill on the fourth day of the Lunar New Year, but no body was found.

Therefore, Song Mingguang and his team judged that the other party abandoned the body on the evening of the fourth day of the Lunar New Year.

"My suggestion is to identify all vehicles and people who may have passed through the road to the landfill during this period, no matter where they went or why, and collect DNA information from all of them."

Song Mingguang also studied the case files of the Red Killer carefully. It can be said that in the previous 10 cases, the police basically used all possible means.

Among these experts, there are people from the provincial and ministerial departments, and even experts from the ministries and commissions, none of whom caught the criminals in the first 10 cases. To be honest, no one knows the probability that the serious crime team can solve the case this time.

Therefore, Song Mingguang's approach is relatively conservative, which is to screen all possible personnel, no matter how long it takes or how much it costs. In short, DNA information of all personnel who may appear at the crime scene is collected, and then compared with the body fluid DNA to identify the murderer.

Although this method is time-consuming and labor-intensive and sounds stupid, Li Donglin actually agrees with it.

This killer in red has killed 11 people in a row. His psychological quality should be very mature and his killing methods are cruel and brutal, but at the same time, he is also very good at hiding himself. He should have strong anti-reconnaissance capabilities, otherwise he would not have been at large for so many years.

"Lu Chuan, what do you need?"

Lu Chuan shook his head. "The technical team is already giving us full support. I need to inspect the body later, and then the black plastic bag where the severed finger was found and the garbage inside, and we need to do a technical appraisal of all of them tonight."

Lu Chuan's main advantage lies in on-site investigation. Although the crime scene this time was messy and no useful information was collected, there were some things that the suspect might have come into contact with, and Lu Chuan wanted to start from this aspect.

The meeting ended quickly, and each group carried out the tasks assigned by Li Donglin according to their own guesses.

The Dongzhou City Criminal Investigation Detachment was completely disbanded and all of them cooperated with the Serious Crime Unit in conducting relevant investigations.

The laboratory of the on-site investigation office of the Dongzhou City Criminal Investigation Detachment.

Lu Chuan has already taken away all the garbage inside the black plastic bag where the severed finger was found.

Lu Chuan planned to conduct a technical identification on the black plastic bag, mainly to see if there was any possibility of finding fingerprints.

There was also garbage in the black plastic bag, including paper towels, vegetable leaves, and some other miscellaneous garbage, which was all taken out without a single drop of clothing.

What attracted Lu Chuan's attention was the brewed tea leaves.

Because it is still winter and the temperature is relatively low, the things in the garbage have not deteriorated. The Dongzhou City Criminal Investigation Detachment froze the relevant species directly after collecting them.

"Big red robe?"

Lu Chuan discovered that these teas were actually top-grade Dahongpao, the tea leaves left after brewing.

Most of the people living in North Second Lane of Jianguo Road are migrant workers and tenants. How could anyone afford to drink such Dahongpao?

Lu Chuan usually likes to drink tea.

Of course he was familiar with this top-grade Dahongpao.

This is a good thing worth tens of thousands of yuan. (End of this chapter)