Chapter 534 Pollen Atlas

Trace evidence laboratory.

White paint, white tables, white laboratory instruments, and lab technicians in white coats...

This is the most advanced laboratory in the Criminal Science Center of Luojin City Bureau. Universities or research institutes may have more advanced laboratories than this, but in the field of criminal investigation, trace evidence laboratories are the ceiling.

Apart from other things, the requirements for a clean laboratory are much higher than the overall expenses of an ordinary laboratory. The smaller the various instruments and equipment, the more expensive they are.

And the lab technicians working in the trace evidence laboratory are generally full-time professionals - other criminal professional positions, except for forensic doctors who usually emphasize professionalism and require professional certificates and education and training, such as on-site investigation, trace detection or toxicology, are all gatherings of elites.

Although the relevant police academies also offer related majors and courses, the requirements within the police are not strict. It is not surprising that some police types can take up their posts after a few months of training.

The requirements for trace evidence laboratories are relatively high, and because of the high construction cost and high use cost, the laboratory's requirements for personnel are naturally high.

But such a group of people, facing the foreign invasion of Jiang Yuan, still wisely chose to obey.

Jiang Yuan actually did not show any offensive power, but his operation itself was extremely offensive.

It's like everyone is playing basketball together. Someone enters the court, smiles politely at everyone, and then starts to shoot mid-range shots, hitting them many times in a row. Everyone screams "wow wow wow wow" and says it's great. This person starts to switch to the three-point line and hits them many times in a row. Everyone starts to praise and salute at the same time. Then, this person dribbles into the basket and dunks many times in a row...

Of course, everyone still has to applaud, but the praise at this time feels a little forced, as if you don't praise, you are a big idiot who is jealous of others' talents.

If this guy dribbles back to the three-point line again and starts to play free throw line jump dunks, what should everyone do?

Cheers are right, but it seems necessary to stay away from the court. Otherwise, it would be too uncomfortable to be a background board for others.

Especially when many classmates raised their mobile phones and gathered around.

Jiang Yuan is almost ready to dunk from the free throw line, and he is changing his posture to dunk.

There is no way, he has just acquired the skills of forensic botany, so he is not very familiar with various techniques. Naturally, he has to operate at the top level. It is impossible for him to deliberately lower his technical level in order to hide his strength and bide his time.

Therefore, you can see Jiang Yuan staining and embedding the pollen, spores and organic residues, watching him put the embedded samples on the slide, and then classify these things under the microscope and write a laboratory report.

Identifying pollen and spores is actually a very difficult job.

Why are there so few botanists in the world, especially botanists who are deeply involved in the field of pollen? Do you dislike them?

Because it is difficult and not profitable!

Many pollens look similar to laymen. Some pollens are indeed similar, and it is almost impossible to distinguish the species. This is not an exaggerated rhetoric, but it is impossible to distinguish. For example, the pollen of roses is basically indistinguishable from the pollen of apples, hawthorns or wild roses.

As for those that are easy to distinguish, that is only for botanists. There are too many types of pollen in the world. Even among botanists, only a few have specialized in pollen, and most people only know the pollen in their local area.

Therefore, similar to cranial repair, forensic botany is an extremely high-end and extremely difficult skill.

Of course, the effect will also be extremely good.

After all, this skill itself is extremely difficult to prevent, and even fewer people know it.

It was not until the 1990s that the United States tried to carry out some applications of forensic botany, and the effect was good, but botanists were not interested in it, and the difficulty was too great, and it is still the same today.

In Jiang Yuan's view, forensic botany today is almost as powerful as DNA when it first came out.

However, because of its difficulty, it cannot be as popular as DNA identification.

But in terms of solving specific individual cases, its value is no less than DNA identification.

"At present, it seems that cereals are the dominant species. They must have stayed in a place with a lot of cereals for a long time."

After confirming the species of pollen and spores contained in each sample through a microscope, Jiang Yuan slowly gave a conclusion report.

The original researchers of the trace evidence laboratory sat opposite Jiang Yuan in a row, listening to him speak.

It was like a group of tall people on the court, watching the good citizens passing by jump from the free throw line and dunk. Identity is not important here, just applaud.

Jiang Yuan operated the microscope while outputting:

"There are inhaled insects in the radiator, which can be studied separately later."

"The pollen in the tire tread is much less than the pollen mixed in the soil outside the tire."

"There are many types of pollen in the air filter, which can be regrouped later."

"The pollen maps of the foot pads and pedals are similar, with nettles, rice plants, Chenopodium, hawthorn, wild roses, ivy, birch, pine, elm..."

When Jiang Yuan said this, a technician next to him had already unfolded the map and started to look at it.

After a while, when Jiang Yuan finished speaking, the technician said, "Captain Jiang, there are not many places with hawthorn trees in Luojin City. It should be used as a landmark."

Jiang Yuan nodded and said, "Okay."

"Rice is the rice family. There should not be many in the city. If it is outside the city, there should not be many hawthorn trees." The technician probably had some hobbies and marked it on the map himself.

Jiang Yuan actually wanted to say that there was no need to be so troublesome. Just find a satellite map that can see the trees on the ground and look for them piece by piece.

Pollen maps can not only be qualitative, but also quantitative. The place where Jiang Yuan spent the most time just now was counting the number of pollen.

This step was also very hard for him. He had to identify the species first and then count, and record in the middle.

However, after completing this step, Jiang Yuan could almost judge the proportion of some plants in the area.

Maybe there are two, three or even ten plots of land with the above plants, but their proportions and quantities must be different.

So, using pollen maps, it is possible to find a unique location.

This is a very powerful part of advanced forensic botany. It is equivalent to the DNA of a location.

Of course, it is also a good thing that someone can help narrow the search range.

Jiang Yuan left the laboratory, changed his clothes, and called Huang Qiangmin again, asking him to find the criminal police detachment of Luojin City to mix satellite images.

After the call, he turned around and saw a row of people behind him, forming a semi-arc, just like in the laboratory, covering Jiang Yuan's back.

Jiang Yuan's vest was cold. If he hadn't temporarily suppressed it, he would have learned the wrestling skills of his uncle Ziqiang.

The leading technician smiled and said, "Curiosity."

Brushing the car skin, looking for pollen, and then determining the location of the kidnappers, this thing sounds easy to make people curious.

The technicians in the trace evidence laboratory still watched Jiang Yuan do it, so they were naturally more curious.

Jiang Yuan didn't care, and smiled and said, "Then go and take a look." Then, he led a group of people to the conference room.

...

At this moment.

Xu Tian, ​​deputy director of Luojin City Bureau, was accompanying the family of the victim with an office staff to do work.

The family of the victim didn't say anything, but just cried anxiously.

The parents of the two primary school students, plus the grandparents, aunts and uncles who accompanied them, filled the huge room.

At the beginning, Xu Tian didn't want so many family members to come, but they couldn't coax the parents of the two families, so they had to let the relatives intervene.

At least, now there are relatives to help coax, they won't be at a loss.

"Director Xu, why don't they let them go? They want money, and the money has been given, what else do they want?" The mother of one of the girls stopped crying, and after saying this, she started crying again.

Xu Tian sighed heavily and said, "We guess they may want another sum of money. They may have some use for the previous 2 million, and the latter sum should be what they really want."

"Also... we... we..." The mother looked at her husband.

The man's face was livid, and he gritted his teeth and said, "I've talked to the bank and asked for a loan first. I'll sell the house today when I go back!"

The woman's expression suddenly relaxed, and then she held her husband's arm and cried.

The man patted her shoulder and said, "We didn't have a house back then. As long as Yuanyuan comes back, we can make money to buy one later."

"Yeah, yeah..." The woman nodded vigorously, and her tears soaked her husband's shoulders.

The couple next to them looked at each other and hugged each other arm in arm.

Xu Tian felt uncomfortable watching this, and not only him, but the police present were not in a good mood. The victims were forced to endure more and more, but they were powerless.

The kidnappers had already asked for more ransom, and the police station could not pay this money. If the victim's family was unwilling to pay, the communication between the two sides would probably be cut off, and the kidnapping case might turn into a homicide case...

However, watching the actions of several people and feeling their emotions, everyone's mood was twisted.

If good people can only vent their emotions with tears, while bad people can get real money, what's the point of having police?

Xu Tian sighed and advised: "Now this case is not only taken seriously by our municipal bureau, but also sent by provincial departments and ministries, and experts from all walks of life come to support. You must maintain confidence and optimism. We are also organizing and coordinating forces from all sides to try to find the other party's location and rescue the child..."

It would have been better if he didn't say it. After saying this, the tears that had just stopped from falling from both parents fell again. The old ladies of the two families also began to pull their sleeves to wipe their tears.

At this time, Huang Qiangmin walked in with a smile on his face.