Most fibers are flammable, but there are a few that are not, or are even flame-resistant, such as fiberglass.

Chlorinated fiber is one of them, also known as polyvinyl chloride fiber, commonly used to make flame-retardant materials.

Because of its good heat retention, heat resistance, and lightweight characteristics, it is suitable for making work clothes for wet environments and outdoor workers.

However, this fiber cannot withstand ironing, does not absorb moisture, has poor static properties, and is difficult to dye industrially, so in recent years, its application in the textile field has become rare.

Therefore, besides some specialized work clothing, very few people wear clothes made of chlorinated fiber.

Regarding Wang Zihan's disappearance and murder, statistically speaking, it is more likely that someone from the surrounding Natural Villages committed the crime.

Because at the West Suburb vineyard, outsiders are rare, and the West Suburb police had already ruled out the possibility of abduction by outsiders during the initial search for Wang Zihan's disappearance.

If the site discovered by Lu Chuan and others is indeed the primary crime scene of Wang Zihan's disappearance, these fibers are likely left by the culprit.

As for Wang Zihan, when she died, she was wearing her school uniform, which was made of pure cotton, so it couldn't possibly contain chlorinated fiber.

After recording the relevant experimental results, Lu Chuan began DNA testing on the already purified skin flakes.

The updated equipment is the most advanced DNA identification instrument currently on the market, offering faster identification speed compared to previous devices.

In less than an hour, the identification was complete.

"Master! There's a match!"

"What matched?"

Liu Guodong, Old Bai, and Yang Sen, who were busy analyzing other physical evidence, quickly came over.

"The skin flakes!"

Lu Chuan handed the comparison analysis report to Liu Guodong: "The skin flakes we found match Wang Zihan's DNA information, the place where the soil was turned is likely Wang Zihan's primary crime scene!"

Liu Guodong took the report and carefully read it through.

"Haha, great!"

Identifying the primary crime scene meant the discovered fibers were likely left by the perpetrator.

"How is the fiber analysis going?"

"It's chlorinated fiber."

"Polyvinyl chloride?"

"Yes, exactly polyvinyl chloride."

Liu Guodong frowned: "This stuff is just ordinary plastic."

"This kind of thing is everywhere in the countryside, but the fiber threads we extracted aren't in the form of regular plastic; they should be textile materials from clothing."

Old Bai shook his head: "Clothes made from this stuff are not breathable, very few people wear them."

Yang Sen agreed: "Besides some specialty work clothes, indeed clothes made from this stuff aren't common. We can send the findings to Ren Qiang's group, and during the investigation, see who wears such clothes. It might narrow down the range."

Meeting Room One.

Ren Qiang was holding the report sent from the Crime Scene Investigation office.

"Clothes made of chlorinated fiber?"

"What clothes are made from chlorinated fiber?"

Ren Qiang evidently had no intuitive understanding of this.

Actually, in reality, chlorinated fiber is still widely used, but mainly in synthetic fibers.

However, what Lu Chuan discovered at the scene was pure chlorinated fiber, which is quite rare.

Liu Guodong took out his phone: "Here's what we found online, clothes made from pure chlorinated fiber. During the investigation, check if anyone wears these kinds of clothes."

"Especially if they are damaged, looking like they've been worn for a long time."

Ren Qiang examined the pictures carefully and took photos with his phone: "In Beitun, we've almost visited all the dozens of households today."

"I'll send the photos in the group chat to see if anyone has seen people in the village wearing these clothes."

"Alright, you carry on, there's still a lot of physical evidence to process in the lab, I'll head back first."

The several boxes of evidence collected by the Crime Scene Investigation team have been narrowed down after confirming the primary crime scene.

Only one box is left to be processed, with forty-three bags.

If things go fast, it can be processed in two or three days.

"Everyone, take a look and see if during today's village visits anyone was found wearing these clothes from the pictures."

"Especially if they are damaged, looking like they've been worn for a long time."

"@Zhang Hui, send it to Sun Jun's team as well and ask for any updates."

"@Ren Qiang, received!"

In the WeChat group, Ren Qiang forwarded the photos Liu Guodong provided to everyone.

But regarding this method of searching, Ren Qiang didn't hold much hope.

After all, finding a killer based on a few fiber threads is something Ren Qiang had never seen before.

However, never seen doesn't mean impossible.

"Brother Qiang... I've seen this piece of clothing... today."

Zhang Hui was holding his phone, pointing to a blue work suit on it.

Ren Qiang was slightly taken aback: "Where?"

"At Tian Zhongfa's house, the first house on the west end of the village, there's a simple-minded wife there, and when I visited she was wearing exactly this blue work suit."

"But, she was wearing a new one, not the damaged one you mentioned."

"New?"

Ren Qiang's eyes squinted slightly.

Changing clothes after committing murder is not unusual?

"Is there anything unusual about Tian Zhongfa?"

"Tian Zhongfa..."

Zhang Hui thought for a moment: "Nothing unusual, he's a rather honest person, with a simple-minded wife at home..."

"To speak of anything unusual... he's one of the few villagers who think Chen Liu wouldn't have killed Wang Zihan over a vineyard contracting issue."

Ren Qiang nodded: "Alright, keep an eye on him, check if there are any disputes or conflicts between Tian Zhongfa's family and the Wang Family."

"Sure, I'll ask a few households about it tomorrow."

A piece of clothing can only provide clues but cannot directly pinpoint a suspect.

Early the next day.

Zhang Hui arrived early at the village.

After a day's investigation and visits yesterday, Zhang Hui has gained some understanding of the village's residents.

Granny Zhang is known as the village's encyclopedia, knowing everything about everyone's affairs.

"You're talking about Old Tian's house, with a simple-minded wife, without any children."

"Their family and the Wang Family didn't have any conflicts, their vineyard plots are adjacent..."

"Oh, five years ago, during the re-division of the vineyard contracting boundaries, Old Wang's family and Old Tian's family fought over the boundary."

"Later, they went to the village party secretary for mediation."

"Oh, Granny Zhang, what exactly happened?"

"Oh, I'm not sure about the specifics, but it was quite a fierce fight with bloodshed at the time, though Old Wang's family later compensated, and that was the end of it."

"How has the relationship between the two families been since?"

"Pretty good, their lands are next to each other, they often interact. Their relationship is quite good..."

After leaving Granny Zhang's house, Zhang Hui went to the village party secretary's house to understand the situation back then.

"Old Wang's family occupied half a ridge of Tian Zhongfa's land, later it seems they returned it, but it's been years, can't remember clearly."

Zhang Hui then visited other villagers who knew about the dispute to gather more information about the situation.

The most important information came from Tian Zhongfa's neighbor.

"The issue between Old Tian's family and the Wang Family was never resolved, actually, that half ridge belongs to Tian Zhongfa. The Wang Family wife insisted it was theirs, Old Tian said while drinking last time, he would get the land back someday..."

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