Chapter 2

Early morning.

Jiang Yuan arrived at the forensic laboratory early, first brewed a cup of tea for himself, then tidied up the desktop, and then began the day's work—looking through the microscope.

The blood-stained clothing, serving as evidence, had already been cut into several pieces for Jiang Yuan to collect pollen under the microscope.

Unlike what many people imagine, when criminal science personnel face evidence, they often don't aim to preserve its original form. Common items like bed sheets and pillowcases at a crime scene, when needing to test for blood or semen, are crudely cut into pieces and then soaked in reagents for further testing.

In addition, paper stained with other substances is handled in a similar way.

Some people might feel uneasy about the destruction of this original state, but looking at it from another angle, when many pieces of evidence are collected, the original state of the evidence is not necessarily collected.

For example, for a bed sheet where someone has died, it is not necessarily required to pack the entire bed sheet back; packing all four pieces of bedding on the bed is even more unnecessary. If it's a technician from the criminal science department doing the work, the most normal way is to cut a piece back.

As for whether evidence will be missed because of this, it depends on the on-site ability of the investigation personnel. Generally speaking, if there is any doubt, they will pack more things back; otherwise, just cutting a piece back as evidence is sufficient.

Of course, depending on the importance of the case, the volume packed back will also be larger.

And for small cases like residential burglary with low case value, you can't pack more back even if you want to. Even if the evidence room doesn't complain, the plaintiff won't be happy that you packed a truckload of their items because of a case involving a few thousand yuan.

Jiang Yuan picked up the pollen grain by grain.

The size of pollen varies greatly. The smallest pollen is about 4 micrometers in length, and the largest pollen has a diameter of 200 micrometers. In terms of morphology, many types of pollen are round and spiky, some are abalone-shaped, and some are triangular...

Overall, if it's only LV1 forensic botany technology, it can easily distinguish pollen, but technicians with insufficient levels will encounter many problems when judging specific species.

As far as the case is concerned, LV1 forensic botany can almost provide no direct clues, at most it can only verify evidence. Or, it is facing a single variety of pollen to narrow down the scope.

An LV2 forensic botanist should have greatly enhanced identification ability, but also needs to constantly consult materials for verification. Needless to say, in this project that is originally very time-consuming, constantly consulting materials means that the progress bar is likely to be stuck.

By LV3, most pollen does not need to be consulted, at least not in large quantities. In this case, the practicality is greatly enhanced.

Jiang Yuan's forensic botany has now reached LV4. Many pollen types can be identified at a glance. Moreover, for some common pollen, he can also distinguish some common ornamental subfamilies. In the eyes of those who know, shouting a Buddhist name is not excessive.

Therefore, the forensic doctors of the Capital Bureau who were busy in the same laboratory found that while Jiang Yuan was constantly picking up pollen, he didn't need any reference materials and was just making records in the notebook next to him.

The TN brand leather notebook made him look like a silly white-collar worker at first glance, but the forensic doctors of the Capital Bureau all knew a little bit about modern cutting-edge technology—training in various places was also tight for the Capital Bureau. So, this matter, which seemed particularly unscientific at first glance, made several forensic doctors suspicious.

"Don't tell me it's made up." The suspicion system of some forensic doctors began to go online.

For criminal police, suspecting 800 times a day is considered few. Facing Jiang Yuan, who is not very familiar, even if he is famous, suspicion is still unstoppable. The organizer of the Hugi case back then was also a Mongolian detective, but wasn't it still a nest of rotten vegetables?

"Little Li, go and take a look." The senior forensic doctor in the office thought and thought, and gave a few low-voiced instructions to the young forensic doctor next to him.

Little Li then stood up, pretended to be bored, and came to Jiang Yuan's side.

He saw that on Jiang Yuan's notebook, a row of plant names had already been recorded, and several of them had been marked with pentagrams by Jiang Yuan: narcissus, dieffenbachia, crown of thorns...

Wu Wu Fa Yi Little Li looked over unconsciously, thinking in his mind, why were these marked?

At this time, Jiang Yuan's eyes left the microscope, he looked up at the forensic doctor next to him, as if he had seen through his thoughts. While writing the words "hyacinth" in the notebook, he marked it with five stars and said, "The marked ones are all poisonous plants."

"Ah?" Half of Little Li's surprise was because of what Jiang Yuan said, and half was because he thought his thoughts had been exposed.

Jiang Yuan really guessed his thoughts. He hadn't been doing things for a day or two. After more than a year of experience, most of the situations he encountered were the same.

Especially technicians, who actually have a heavier spirit of suspicion. Because Muggles originally didn't know the depth of technology, they thought that fingerprints and DNA were automatically produced. Technicians are different; they know that some things are maddeningly difficult, just like some math problems, they are confused themselves, believe that someone can do it, but don't believe that this person will appear by their side.

Jiang Yuan's eyes stuck to the microscope again, and he said, "The pollen collected so far is mainly domestic, and there is pollen from various poisonous plants. In addition, there is some vegetable pollen, such as cucumber pollen, chili pollen, eggplant, loofah, pumpkin, onion... The owner of the clothes should have a place by their side."

Now, the attention of several forensic doctors in the office was attracted.

The most senior forensic doctor, Guo Xiang, stood up and asked, "Why not living in a place like a vegetable garden?"

"Because there are many indoor plants, the types of ornamental plants are very complicated, and the situation of mixed poisonous plants in the vegetable garden should be rare." Jiang Yuan paused and said, "As far as the overall pollen map is concerned, it is more like the type of planting flowers and vegetables on the balcony, with a little bit of everything. And planting vegetables in the vegetable garden, the varieties will be relatively single."

Jiang Yuan's words belong to reasoning and judgment. Guo Xiang didn't struggle much, just pretended to be curious and said, "What does cucumber pollen look like? Can I see it?"

"This." Jiang Yuan then showed the collected cucumber pollen to Guo Xiang.

Under the microscope, cucumber pollen is tender green, slightly oval irregular round, with dense wrinkles on it, and three yellow grooves of different depths, among which there is a more irregular connective tissue at the thickest groove.

Guo Xiang looked at it carefully, kept it in his heart, said two more scene words, and returned to his seat. Then he searched for the forensic botany atlas on the intranet and searched for cucumber directly.

Sure enough, it was exactly the same.

Guo Xiang was still not at ease, searched for the appearance of pollen of plants such as narcissus and chili, kept it in his heart, and then came to find Jiang Yuan, sat next to him, and used another microscope to look at the pollen he screened.

Sure enough, it was similar.

Guo Xiang breathed a sigh of relief, and then raised deeper suspicion, looked Jiang Yuan up and down, and said, "I just checked, there are 250,000 species of angiosperms, right? You can't remember the appearance of every pollen. This is too exaggerated."

"How is that possible." Jiang Yuan smiled.

Guo Xiang also smiled.

Jiang Yuan said, "There are rules."

Guo Xiang's smile was slightly stagnant: "250,000 species?"

"That's certainly impossible. For those that are not common, it is better to make judgments after identifying the species." Jiang Yuan said true and false.

But for Guo Xiang, Jiang Yuan's humility at this time made people even more unable to touch the depth.

And as a technical person, after verification, what Guo Xiang can do is to be convinced of Jiang Yuan's judgment.

"In this way, if we don't consider the vegetable garden, what we are looking for is a person who grows vegetables at home?" Guo Xiang began to discuss specific clues.

Jiang Yuan pondered slightly and said, "Actually, you don't have to think so much. Taking the place where the blood-stained clothes were found as the radius, how about flying a drone first? In terms of the types of these flowers and vegetables, I think the place where the blood-stained clothes were in contact should not be purely indoors. It must have sufficient sunlight and a certain area to grow so many plants. If it is purely indoors, the light must be very good."

"That is balcony vegetable planting, or rooftop vegetable planting." Guo Xiang summarized.

"It is also possible to be the green space of the community, or inside the courtyard." The forensic doctor next to him added a sentence.

Guo Xiang nodded along and said, "Then trouble Wu Wu Fa Yi Jiang to report? If you fly a drone, you still have to consider the situation around the scene. In my impression, there should be no no-fly situation."

Jiang Yuan knew that he was avoiding grabbing his own credit, so he said indifferently, "You call, you can communicate within your own team. Besides, the clues of forensic botany can only be mine, and you can't grab them."

He said it so plainly, which made Guo Xiang a little helpless.

Guo Xiang didn't talk nonsense anymore, took out his mobile phone and made a call.

At this time, he recalled that this was the first good news since the case started.

Guo Xiang looked back at Jiang Yuan. It had only been a day or so. In fact, he hadn't seen Jiang Yuan exert much effort. The results obtained seemed quite plain, but the clues were real. For the criminal police in the team, this was the most important thing.