National Forensic Doctor

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early morning.

Jiang Yuan came to the forensic laboratory early, made himself a cup of tea, tidied the table, and then started the day's work - looking at the microscope.

Several pieces of the bloody clothes as evidence had been cut out for Jiang Yuan to pick up pollen under a microscope.

Contrary to what many people imagine, criminal investigators often do not aim to preserve their original form when facing evidence. Commonly used items such as sheets and pillowcases at crime scenes are used to test blood or rice fluid. They simply cut out a piece and soak it in the reagent for further testing.

In addition, paper contaminated with other substances is also treated in a similar way.

Some people may feel uneasy about the destruction of this original state, but from another perspective, many exhibits will not be returned in their original state when evidence is collected.

For example, if the bed sheet is extremely expensive, it is not necessarily necessary to pack the entire bed sheet back, and it is even more unnecessary to pack back all four pieces of the bed set. If it is a technician from the criminal department, the most normal way is to cut off a piece and bring it back.

As for whether evidence will be missed because of this, it depends on the on-site capabilities of the investigators. Generally speaking, if you have any questions, you will pack more things and bring them back. Otherwise, you can just cut a piece and bring it back as evidence.

Of course, depending on the importance of the item, the size of the package will be larger.

As for a small case of burglary and low value, you can't pack it up even if you want to bring it back. Even if the evidence room doesn't say anything, the plaintiff won't be happy that you packed up a piece of his house because of a case worth several thousand dollars. Truck items.

Jiang Yuan picked up pollen one by one.

The size of pollen varies greatly. The smallest pollen is only about 4 microns in length, and the largest pollen is 200 microns in diameter. In terms of shape, there are many species of pollen that are round and spiny, some are abalone-shaped, and some are triangular. …

In general, if you only have LV1 forensic botany technology, you can easily distinguish pollen. However, technicians with insufficient level will encounter many problems when it comes to determining specific species.

As far as the case is concerned, LV1 level forensic botany can hardly provide direct clues. At best, it can only check the evidence. Or, just face a single type of pollen and narrow down the scope.

A LV2 level forensic botanist's identification ability should be greatly enhanced, but they also need to constantly check the information for verification. Needless to say, on an already very time-consuming project like this, constant checking of information means that the progress bar is likely to get stuck.

By LV3, most pollen no longer needs 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, and many pollen species can be identified at a glance. Moreover, he can also distinguish some common ornamental subfamilies from certain common pollens. From a knowledgeable perspective, it is not too much to shout the Buddha's name.

Therefore, the forensic doctors from the Beijing Bureau who were busy in the same laboratory found that Jiang Yuan was constantly picking up pollen, and he was making notes in the notebook next to him as if he didn't need any reference materials.

The TN brand leather notebook looks like a silly white-collar worker at first glance, but the forensic doctors in the Beijing Bureau are more or less knowledgeable about modern cutting-edge technologies - training from all over the country is also closely followed by the Beijing Bureau, so, This kind of thing, which seemed particularly unscientific at first glance, made several forensic doctors suspicious.

"Don't make it up." A forensic suspicion system started to come online.

For a criminal police officer, 800 suspicions a day is considered a small number. Facing Jiang Yuan, whom he was not very familiar with, suspicion could not stop even if he was famous. Back then, the organizer of the Huge Gu was still a Mongolian detective, but it turned out not to be a mess.

"Xiao Li, go and take a look." The senior forensic doctor in the office was thinking about it and whispered a few words to the young forensic doctor next to him.

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

I saw a row of plant names recorded in Jiang Yuan's notebook, several of which were painted with five-pointed stars by Jiang Yuan: Narcissus, Dripping Water Guanyin, Tiger-thorn Plum...

Forensic doctor Xiao Li looked over unconsciously, thinking in his mind, why were these marked?

At this time, Jiang Yuan's eyes left the microscope and he looked up at the forensic doctor next to him. As if he had read through his thoughts, he wrote the words "hyacinth" in his notebook and marked five stars. Said: "Those marked are poisonous plants."

"Ah?" Xiao Li's surprise was partly because of what Jiang Yuan said, and partly because he thought his mind had been revealed.

Jiang Yuan really guessed what he was thinking. He doesn't go out to do things for a day or two anymore. After more than a year of experience, most of the situations he encounters are the same.

Technicians, in particular, are actually more skeptical. Because Muggles don't know the depth of technology in the first place, they think fingerprints and DNA will produce results automatically. Technicians are different. They know that some things are outrageously difficult, just like some math problems. They are confused and believe that someone can do it, but they don't believe that this person will appear next to them.

Jiang Yuan put his eyes on the microscope again and said: "The pollen taken out so far is mainly domestic, and there are pollen from a variety of poisonous plants. In addition, there are also pollen from some vegetables, such as cucumber pollen. , pepper pollen, eggplant, loofah, pumpkin, onion... The owner of the clothes should have a place around him."

At this time, the attention of several forensic doctors in the office was attracted.

Guo Xiang, the most senior forensic doctor, stood up and came over, first asking: "Why don't you live in a vegetable garden or something like that?"

"Because there are mostly indoor plants, the types of ornamental plants are very complicated, and it should be relatively rare to mix poisonous plants in vegetable gardens." Jiang Yuan paused, and then said: "As far as the overall pollen map is concerned, it is more like When you grow flowers and vegetables on the balcony, you have a variety of types. When you grow vegetables in the vegetable garden, the varieties are relatively narrow."

Jiang Yuan's words belong to reasoning and judgment. Guo Xiang didn't hesitate, he just looked curious and said, "What does cucumber pollen look like? Can you take a look?"

"This." Jiang Yuan then showed Guo Xiang the pollen from the cucumber he picked up.

Under a microscope, cucumber pollen is bright green, slightly elliptical and irregular in shape, with dense wrinkles on it and three yellow grooves of different shades. The thickest groove has a thicker one. Irregular connective tissue.

Guo Xiang read it carefully, remembered it in his mind, said a few more words about the scene, returned to his seat, found an illustrated book on forensic botany on the intranet, and searched directly for cucumbers.

It's exactly the same.

Guo Xiang was not reassured enough, so he searched for the appearance of pollen from daffodils, peppers and other plants, and remembered it in his mind. Then he came to find Jiang Yuan, sat next to him, and used another microscope to look at the pollen he had sifted.

Sure enough it is similar.

Guo Xiang breathed a sigh of relief, then became more suspicious. He looked Jiang Yuan up and down and said, "I just checked. There are 250,000 species of angiosperms. The pollen of each species looks like it, don't you think?" Maybe remember it all. This is too exaggerated."

"How is that possible?" Jiang Yuan smiled.

Guo Xiang also laughed.

Jiang Yuandao: "There is a pattern."

Guo Xiang's smile faltered: "250,000 kinds?"

"Of course that's impossible. It's not common. We have to identify the species before we can make a judgment." Jiang Yuan said the truth.

But for Guo Xiang, Jiang Yuan's modesty at this time was even more confusing.

As a technician, after verification, all Guo Xiang can do is to convince Jiang Yuan's judgment.

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

Jiang Yuan pondered for a moment and said: "Actually, you don't have to think too much. Just take the place where the blood clothes were found as the radius and fly the drone first. In terms of the types of flowers and vegetables, I think the place where the blood clothes come into contact is , it should not be purely indoor, it must have sufficient sunlight and a certain area to grow so many kinds of plants. If it is purely indoor, the light must be very good.”

"That's growing vegetables on the balcony or on the rooftop." Guo Xiang concluded.

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

Guo Xiang nodded obediently, and then said: "Can you please report to Captain Jiang? If you fly a drone, you have to consider the situation around the scene. I don't think there is a no-fly situation."

Jiang Yuan knew that he was trying to avoid taking away his own merit, so he said nonchalantly: "You go ahead and fight, it will be easier for your team to communicate. Besides, the forensic botany clues can only be mine, and you can't take them away." .”

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

Guo Xiang stopped talking, took out his mobile phone and made a call.

At this time, he recalled that this was the first good news after starting this book.

Guo Xiang turned back and glanced at Jiang Yuan. He had only been working for more than a day. In fact, he had not seen how Jiang Yuan had exerted his efforts. The results he obtained seemed to be quite mediocre, but the clues were real. For the people in the team, For detectives, this is the most important thing.