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 used as evidence had been cut out for Jiang Yuan to pick up pollen under a microscope.
Contrary to what many people imagine, when criminal investigators face evidence, they often do not aim to preserve its original form. Common objects such as sheets and pillows at crime scenes are tested for blood or rice green liquid.
Sometimes, you just roughly cut a piece out, then 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 a bed sheet has been killed by others, 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 ability of the investigators. Generally speaking, if you have any doubts, 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 case, the size of the package will be larger.
And for a small case like burglary with a low value, you can't pack more and bring it back. Even if the evidence room doesn't say anything, the plaintiff won't be happy for you to pack up a truckload of his belongings for a case worth several thousand dollars.
.
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 most, it can only check the evidence. Or, in the face of a single species of pollen, narrow the scope.
An LV2 level forensic botanist's identification ability should be greatly enhanced, but he also needs to constantly check the data for verification. Needless to say, on this kind of project that is already very time-consuming, constantly checking the data means that the progress bar
It's very likely that it's stuck.
By LV3, most pollens no longer 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, and many pollen species can be identified at a glance. Moreover, for some common pollen, he can also distinguish some common ornamental subfamilies, which can be viewed with a knowledgeable eye.
Here, shouting the Buddha's name is not too much.
Therefore, the forensic doctors from the Beijing Bureau who were busy in the same laboratory discovered that Jiang Yuan was constantly picking up pollen, and at the same time, 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.
As a criminal police officer, 800 suspicions a day is considered a small number. Facing Jiang Yuan, whom he is not very familiar with, even if he is famous, suspicions cannot be stopped. The organizer of the Hug case back then was a Mongolian detective. As a result
It's not a bunch of bad food.
"Xiao Li, go take a look." The senior forensic doctor in the office was thinking about it, and then 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 even 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, marked five stars, and 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. It wasn't just a day or two when he went out to do things. After more than a year of experience, most of the situations he encountered were 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 difficult.
It's outrageous, just like some math problems. I'm confused. I believe someone can solve it, but I don't believe that this person will appear next to me.
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 some vegetable pollens, such as cucumber pollen.
, pepper pollen, eggplant, loofah, pumpkin, onion... The owner of the clothes should have a place around him."
At this moment, 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, there are a variety of types. When you grow vegetables in the vegetable garden, the varieties are relatively limited."
Jiang Yuan's words were reasoning and judgment. Guo Xiang didn't dwell too much on it. 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 the 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, looked for an illustrated book on forensic botany on the intranet, and searched directly for cucumber.
Sure enough, they are 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, and then he became more suspicious. He looked Jiang Yuan up and down and said, "I just checked. There are 250,000 kinds of angiosperms. The pollen of each kind looks like something you don't know."
Maybe remember it all. This is too exaggerated."
"How is that possible?" Jiang Yuan smiled.
Guo Xiang also laughed.
Jiang Yuandao: "It's regular."
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 believe in 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 it to Team 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 since the case was opened.
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 criminal police in the team,
