Chapter 654: Breakthrough

"The clothes have been brought back."

Wang Chuanxing and Shen Yaowei returned together, carrying several large boxes of evidence. Wang Chuanxing put the items into the cabinet while saying: "The conditions at the Zhengguang Branch are really good. That evidence room is built better than our newly built office."

"Can't compare with the capital's. Besides, they are just large. The pure decoration is just like that. Furthermore, the evidence room doesn't have any equipment, it's just a matter of buying some cabinets and a few computers." Huang Qiangmin was sitting nearby and curled his lips.

The infrastructure of the capital is not something a small county can compare with. Don't look at the high housing prices in the capital; when various departments build public facilities, the goal of being magnificent and grand is still very easy to achieve. For a unit like the Zhengguang Branch, the normal annual funding is over 2 billion, a master whose leg hair is thicker than a waist.

Wang Chuanxing was seconded from the provincial capital to Ningtai County, so he didn't have that much fear of Huang Qiangmin. He smiled and said: "Their evidence room has constant temperature and humidity. If I became evidence, I would be willing to live in one like this."

"If you became evidence, you would also go to the ice coffin of the anatomy center in the capital." Shen Yaowei was very sensible and smiled at Huang Qiangmin, saying: "The benefit of the capital is that the evidence is well preserved. I guess Team Leader Jiang can extract a lot of pollen."

When he said this, several people looked at Jiang Yuan, who was sitting in front of the lab bench.

There was only a microscope on the lab bench, and then a tray of tweezers and such things. This work could be done by asking someone for help, but the case was serious, and the most favorable evidence currently was the pollen on the clothes, so Jiang Yuan was too lazy to let others do the first pollen picking work.

To be honest, teaching a forensic doctor who had never done similar work, then watching them do it for a while, answering some questions in the middle, and solving some small episodes in the experiment, would probably be more tiring than doing it himself.

"I don't know what can be found yet. I'll know when I see it. Bureau Chief Huang, you should rest. This is not work that can be finished in one day." Jiang Yuan spread out various utensils and took out the first piece of clothing from the evidence bag. A foul smell drifted out after several years, and it was even stronger than usual, like a fart that had been covered for a long time, neither gas nor solid, neither soft nor hard...

Huang Qiangmin's breathing was instantly disordered for a few seconds. He skillfully put on a mask and then said: "I'll sit with you for a while. I have nothing to do now anyway. I'll browse my phone, and then we'll find a good restaurant to eat something good tonight. Use public funds. The Zhengguang Branch's."

When he said this, Wang Chuanxing and Shen Yaowei looked at each other and said hurriedly: "We will stay too. Although we can't help much, we will listen to Team Leader Jiang and Political Commissar Huang's orders."

Huang Qiangmin smiled and took out his phone: "By the way, let me show you the detention center newly built by our bureau. They are still working on the underground pipe network now. Look at this construction standard. It's just that this video cannot be made public, otherwise, those who escaped from prison would cry their eyes out."

Jiang Yuan had already seen it before, so he couldn't help but smile, and then focused his attention on the microscope.

Just as he said just now, he would only know what he could see when he saw the evidence.

Rainwater, various cleaning agents, friction, time factors, and environmental factors could all cause some pollen to lose its adhesion or disappear completely.

However, overall, pollen is still a very tenacious piece of evidence. It is not like small fry such as blood or hair, which are neither acidic nor alkaline. Pollen has survived many century-level biological extinction environments. Volcanic ash, deep-well ice, floods and beasts, beauties and silk stockings, hairy parasites, smooth microorganisms, and nuclear radiation from across the ocean are all not worth mentioning in the eyes of pollen.

In the microscope, many pollen grains are almost like fortresses, with long and tough thorns, thick muscles and bones, and dense fine nets. If magnified tens of thousands of times, they look like space fortresses with a sense of future technology. They look unprovokable no matter how you look at them.

If comic artists get stuck, searching for a few pollen illustrations to modify is much more powerful than a made-up space fortress. The pollen patterns that look a bit yellow can even be drawn into adult comics.

"Asteraceae pollen." Jiang Yuan shook his neck and began to record in his notebook.

There was not much pollen on the clothes. Jiang Yuan first picked out the obvious pollen.

Huang Qiangmin, who was still browsing his phone nearby, immediately sat over and asked: "Chrysanthemum?"

"Asteraceae is not chrysanthemum." Jiang Yuan continued to look at the microscope, and while looking, he said subconsciously: "According to the pollen classification, Asteraceae has three types of pollen: sunflower type, Senecio type, and Anthemis type. This one should be the sunflower type."

"In other words, there are sunflowers at the crime scene?"

"It's not that simple. Because among the sunflower-type pollen, there are also many types, including the Heliantheae tribe, Eupatorieae tribe, Astereae tribe, Helenieae tribe, Calenduleae tribe, and Inuleae tribe and Senecioneae tribe also have this type of pollen..." What Jiang Yuan said were tribes, and there were about 30 genera below, which were very complex.

Most people engaged in forensic botany would basically give up when they heard this.

Huang Qiangmin also had a headache and frowned with his black face: "Just tell me if there are sunflowers at the scene."

"Yes." What Jiang Yuan found was really a pollen grain of the Helianthus genus.

This judgment alone was enough to drive normal botanists crazy. Sunflower-type pollen has both similar and different places, and it is not easy to judge. In fact, it should be very difficult.

Jiang Yuan gave the conclusion without checking any data, which was equivalent to performing instant spellcasting without a magic book. Unfortunately, the scene was full of Muggles, and none of them understood.

"When the third victim was discovered, there were no sunflowers at the scene. So, have we started to approach the first scene?" Wang Chuanxing turned over and was already in high spirits.

"We are still far from locating it." Jiang Yuan raised his head and looked at Wang Chuanxing, then began to pinch the next pollen grain.

Wang Chuanxing shook his head: "Even so, it is already a breakthrough. Considering other aspects, such as the victim's mobile phone positioning on that day, eyewitness testimony, etc., maybe we can find the first scene."

Indeed, doing forensic botany in the city is not as satisfying as in the wilderness.

But from another angle, the source of pollen in the city is also very single. Even for pollen of common plants like sunflowers, it's not like it's there just because you want it to be.

Jiang Yuan has technology, so he naturally wouldn't use this rough method. Moreover, the pollen on the clothes has already started to be tested. This time, it must be completely tested. Otherwise, if the case is not solved smoothly later, re-testing will be the second test. Not only is the accuracy limited, but a lot of information may be lost.

Whether the case is solved or not is another matter, but the text work must be done well. This is also one of the foundations for Jiang Yuan to rely on reading case files to solve cases now.

Soon, Jiang Yuan scanned the pollen of willow and pine trees again, and then camellia and clematis...

However, the most abundant was still sunflower pollen.

At the moment when Jiang Yuan was picking and doubting life, he suddenly raised his head and said: "Sunflowers are insect-pollinated."

"Huh?" Huang Qiangmin and others present didn't react.

"Wind-pollinated pollen has a long transmission distance, while insect-pollinated pollen has a short transmission distance. If it is a sunflower field, there will basically be beehives nearby." Jiang Yuan said while recording. When the time comes to find the place, it must be consistent one by one to be useful.

Overall, the requirements for forensic botany are still very strict, but when used for investigation, it is also a bit overbearing.

Don't look at the killer cleaning up the crime scene like a professional, but how to deal with forensic botany? ===== CHAPTER 655 =====