Chapter 1103: Wool Socks

Liu Jinghui played with his mobile phone, observing Jiang Yuan from time to time.

He is a brain-eater, so he naturally doesn't need to study on a microscope like a technical house.

This also made Liu Jinghui discover something strange. Jiang Yuan, who was originally looking at the instructions and the microscope, was empty at this time, just like a student who started to lose his mind halfway through class.

Liu Jinghui couldn't help but smile. This state of Jiang Yuan is quite a newcomer. If police and criminals can choose in both directions, this Jiang Yuan would probably be chosen by many people.

In Liu Jinghui's mind, he began to reflect the scene of the dragon slaughtering the array... The sharp dragon claws, one grab and one throw are the lives of several criminals; the gushing dragon flames, one spray and one shake, are the lives of a ticket of criminals; the thick dragon tail, one smash and one turn, are the lives of a battalion of criminals...

"I am ready to invite Professor Su Lei and the others to come over." Jiang Yuan withdrew his gaze at some point, and his tone began to become serious.

Liu Jinghui often analyzes the people around him. He saw that Jiang Yuan's state was unusual at this time, and Liu Jinghui couldn't help but ask: "Did you see anything?"

Jiang Yuan couldn't say that he saw the system task. His eyes turned, and he blamed the microscope: "This set of equipment bought by the Lanyue City Bureau is a bit troublesome. I am too lazy to look at it. Let Professor Su Lei and the others come over to study it."

"Is it so complicated? I see you using their microscopes and so on in other police stations, all of which are hand-held." Liu Jinghui just said so, and then said: "Then you make a call. What do we do while waiting for them?"

"Eat hot pot. My old man sent a lot of sliced beef frozen in the refrigerator." Jiang Yuan said while taking out his mobile phone and calling Professor Su Lei.

The diatom database of the Taihe River Basin was a project commissioned by Professor Su Lei's project team. Jiang Yuan is equivalent to her team's party A. Coupled with the technical advantages of forensic botany, a phone call went over, and Su Lei immediately gave a positive answer.

Hanging up the phone, Jiang Yuan said to Liu Jinghui: "There is nothing else today. Zhang Lei's DNA was just taken. It will be about tomorrow when it is compared. Go back."

The inspection materials for comparing DNA are different, and the time consumed is also different. The most time-saving and labor-saving is blood, and when the corpse rots, the first to break is blood.

The forensic laboratory in Lanyue City has considerable strength, and the normal process does not need Jiang Yuan to worry about.

Instead, Liu Jinghui, who followed Jiang Yuan to skip work during the day, felt a bit uncomfortable.

That evening, Su Lei brought her doctoral student Qiao Shengli and landed in Lanyue City.

She is also a busy person now. Since the research direction included forensic botany and published two heavy papers, Su Lei not only has continuous academic conferences, but also because of the cooperation with Jiang Yuan, she has received attention from police stations all over the country, and will receive invitations from time to time.

For a scholar at the Agricultural Research Institute, this is a very interesting and revolutionary life change. Su Lei is having a great time.

Qiao Shengli's expectation is even more happy.

They checked into the hotel that evening, and the next morning, Qiao Shengli got up 2 hours early and put on full makeup to see Jiang Yuan.

Jiang Yuan arranged breakfast at Yilanju as usual.

The fried dumplings with crispy shells and thick soup were welcomed by everyone.

Qiao Shengli couldn't help but eat two, and then looked at Jiang Yuan in a daze.

Even when sitting down, Jiang Yuan was more than half a head taller than the people next to him, which was very conspicuous.

Qiao Shengli looked at it while thinking about what to say next. At this time, the door of the private room opened.

"Team Leader Jiang, I happened to be eating breakfast here too. I heard you came, what a coincidence." The neck of Dong Xifeng, the vice president of the Film and Television City, was full of sweat.

Behind him, two sleepy little beauties drilled out, looked at Jiang Yuan, and shouted together tenderly: "Brother Jiang..."

Qiao Shengli inexplicably felt angry and ate two more fried dumplings!

... 【110

Su Lei and Qiao Shengli were both experienced in working away from home; they carried all their small-scale equipment with them and had notified the Lanyue Municipal Bureau in advance to borrow large items like the ultra-clean workbench.

Any equipment the Lanyue Municipal Bureau lacked, Lanyue University had. With Dai Mingsheng stepping in, it was very easy to finalize the schedule.

Su Lei, Qiao Shengli, and the others immediately entered into their busy work.

At the time, there were not many clothing fragments left, and most had been washed away. However, the investigation discipline of Jiang Yuan's special task force was always strict; the specifically preserved clothing fragments, as well as some soil from the crime scene, could all be used for forensic botanical analysis. In particular, the remaining wool socks had their leg portions well-preserved and were contaminated with a large amount of plant spores and pollen, further increasing their value.

For the deceased Zhang Lei, this pair of socks was likely the most useful single item he had ever purchased.

The spores and pollen needed for forensic botany can be as small as the nanometer level; therefore, even a tiny sock leg can provide a great deal of information.

However, picking out the spores and pollen one by one and placing them on slides for identification is only the first step; classifying and analyzing them is the most difficult part.

Within this, the identification of spores and pollen can be broken down into several levels. LV1 forensic botany can identify most spore and pollen genera and species, but that is all.

Placed within the Mammalia class, the genus level is equivalent to the cat genus or dog genus. Taking the dog genus as an example, there are 8 species, including the gray wolf, coyote, African wolf, Ethiopian wolf, etc. To the average person, these different species of wolves are likely indistinguishable.

And the domestic dog familiar to ordinary people is actually just a subspecies under the "gray wolf species."

This subspecies has 39 varieties, including the domestic dog, Arabian wolf, Arctic wolf, Mexican wolf, Siberian wolf, Florida wolf, Japanese wolf, Austro-Hungarian wolf, Chinese wolf, and Mongolian wolf, among others.

As can be seen from the names, if one masters this step, the task of classification and identification becomes much easier. Because the distribution range of certain plants is limited, if one can identify key plants, one can immediately narrow down the scope significantly.

Of course, ultimately one must rely on pollen profiles. A pollen profile composed of various pollen spores is like DNA; it can be precise to the meter level and is basically impossible to replicate.

Su Lei has roughly LV2 forensic botany proficiency, and Qiao Shengli is about at the maxed-out LV1 level. Therefore, Su Lei can barely manage forensic botany, but she does it very slowly, constantly checking materials for comparison.

Qiao Shengli is basically unable to independently perform forensic botanical identification work. Her experience is still shallow, and her accumulation of taxonomy is also limited. Independent identification ends at the "gray wolf" species level; for any botanical classification below that, she basically has to check materials for every single type, and even then, she must compare them very carefully while holding the materials. For a homicide case, this is an unacceptable time cost.

If Jiang Yuan handles a case with LV4 forensic botany, it can only be said to be just enough.

However, if he activates his temporary +1, he can easily identify down to the subspecies level. Although he still has to check materials for certain unfamiliar genera or species, for the case, identifying to this level has already brought about a direct change.

Placed in the dog genus, Jiang Yuan is equivalent to being able to distinguish between a Husky and a Golden Retriever.

This means Jiang Yuan is very relaxed in the first stage. Similarly, a botanist with this level of skill cannot fail in the stage of classifying and analyzing spores and pollen.

And this scene, falling into Qiao Shengli's eyes, made her feel somewhat unbelievable.

She waited until Jiang Yuan's mid-way break to quickly grab a thermos and go to refill Jiang Yuan's water, then asked: "For this case, the classification stage must distinguish between the primary scene and the secondary scene, which should be very difficult, right? Which spores and pollen were contaminated at the primary scene and which at the secondary scene? It's easy to get them mixed up, right?"

"If it's just distinguishing between the primary and secondary scenes, there are many ways," Jiang Yuan said while drinking tea, relaxed. "The most basic method is to first analyze the spores and pollen from the secondary scene again. Exclude the spores and pollen from the secondary scene, and the rest..."

"The rest are from the primary scene!" Qiao Shengli answered eagerly.

Jiang Yuan smiled slightly and said: "It could also be spores and pollen brought by the killer."

The victim was moved here, and spores and pollen could have been picked up along the way; the killer's contact with him also inevitably involved an exchange of spores and pollen.

"Oh, right, I didn't think that deeply." Qiao Shengli wore full makeup and acted cute, with a very strong girlish vibe.

Jiang Yuan swallowed with a "gulp" and added: "The places the victim passed through while alive could also have contaminated him with spores and pollen."

"Oh, right, there are so many factors involved." Qiao Shengli frowned slightly.

"It sounds difficult, but if you analyze them one by one, it's really nothing. The spores and pollen contaminated in places the victim passed through while alive must be relatively uniform, the quantity of spores and pollen per unit area is relatively small, and they should be primarily wind-pollinated plants. But after the victim died, when they came into contact with the ground, the amount of spores and pollen contacted would increase exponentially."

Qiao Shengli listened earnestly, still frowning and nodding.

For her, this level of judgment was too difficult.

Jiang Yuan smiled and said: "For this case, there is another shortcut."

"What shortcut?"

"Wool socks." Jiang Yuan continued to increase the value of the wool socks, saying: "The victim must have been wearing shoes while alive, so the part below the sock leg would not easily come into contact with spores and pollen before the victim died. Wool socks are also particularly prone to retaining spores and pollen... Actually, just analyzing these wool socks is enough to make a forensic botanical judgment."