Chapter 514: Provincial Flow

The meeting ended.

Jiang Yuan followed Pang Jidong, the captain of the Fourth Brigade, straight to the evidence room, and took the main physical evidence, which was the clothes of all four victims.

Besides this, the criminal science and technology personnel of the day also took some other physical evidence from the victims, including some small grass leaves or tree leaves, mud and fibers in the victims' fingernails, lubricant left in the victims' lower body and underwear, etc., but there was no decisive physical evidence.

Jiang Yuan didn't extract this part of the physical evidence either, and took the clothes back to the laboratory.

Compared to the human body itself, pollen stays on textiles for a longer time. Especially for certain pollen relative to certain textiles, because the volume size is suitable, pollen can even stay for months or even longer without being lost.

In fact, the practical application of pollen research is most used in archaeology. A typical example is that archaeologists found pollen of cultivated crops and herbaceous plants such as rye, barley, couch grass, and Artemisia from an Iron Age tomb, a tomb with well-preserved clothes and hair, from the textiles. These pollen grains obviously could not be caused by pollution during burial, but were old and stored in the textiles.

Pollen with a chitin-like polymer shell, if it could be enlarged to the scale of a building, its defensive performance would be stronger than the defense of the strongest fortress of mankind, especially in terms of three-defense performance and the ability to resist natural erosion, which is several orders of magnitude stronger than man-made objects.

Under the stereomicroscope of the trace evidence laboratory, the performance of the evidence also proved this point.

There are pollen and spores on every piece of clothing, and the quantity is not small.

Without special cleaning, normal people's clothes should be like this—a life tip derived from this: how to know if the clothes you bought from Taobao are brand new or returned by someone else? Spend a few hundred yuan to buy a stereomicroscope from Taobao and look at the number of plant pollen grains stored in the fabric, and you will know.

If you read more books and have rich knowledge, you can also judge the living environment and even the life trajectory of the previous owner through the plant pollen in the fabric.

If you are idle enough and have a little luck, maybe you can even locate the address of the previous owner.

As for the operation of the stereomicroscope, it is not difficult. The most common scenes for similar models are the workbenches of watch repair masters and mobile phone repair masters. Those who do carving and antique appraisal also use this type of microscope.

Therefore, finding the predecessor doesn't require deep skills; just have hands.

"I'll check it first, and then make pollen specimens later. You guys prepare." Jiang Yuan said while using the stereomicroscope to look at the pollen in the clothing fibers and picking them out, while instructing the technicians in the trace evidence laboratory.

A stereomicroscope can observe pollen grains well, but it is not enough to be used as court evidence.

A stereomicroscope sees complete pollen individuals, but specifically for the hairs, grooves, dings, and teeth on the pollen, the stereomicroscope doesn't see them very clearly.

At this time, a compound microscope is needed, which is a microscope with slides and light sources shooting from below. Most of the biological laboratories in schools use this type of microscope, which can see the cell structure, so naturally, it can also see the specific situation of pollen clearly.

The technicians in the trace evidence laboratory immediately prepared busily.

Pollen on slides needs extra processing, and it also takes some time.

Jiang Yuan first counted the larger, easier-to-identify pollen grains and made records.

This is a long process. If it is an ordinary botanist, even a very powerful botanist who can work independently, after studying pollen in a professional field for a long time, it is actually still very difficult to be competent for the work of forensic botany.

At the very least, a botanist who has read a doctorate and worked in the field of pollen for three to five years, barely reaching LV2, would have to spend several days to make a piece of evidence.

It's like mixing a group of birds that look similar together, giving you a book of bird encyclopedias, and letting you distinguish their species.

Or, more specifically, send a pile of photos of microorganisms, give a book of microorganism encyclopedias, and then identify them.

Ordinary botanists are really holding books to retrieve.

Most people only study a small field they are familiar with, such as specializing in pine trees, or specializing in birch forests and associated plants.

After expanding to the full field, the complexity of this work is greatly increased, and the operability is greatly reduced.

Jiang Yuan upgraded the forensic botany LV3 to forensic botany LV4 using temporary skills. A very BUG point is that it greatly reduced the number of times to check books. The level that needs to be retrieved is lowered, which can save a lot of time.

The one who saved time was also Yi Qin Shi Huang, the captain of the Second Brigade.

Yi Qin Shi Huang is a traditional old criminal police officer. There is nothing to say about this. There are many old criminal police officers in the criminal police team. They have experienced suffering, believe in suffering, and trust suffering.

In order to solve a case, wearing through the soles of shoes is the capital they talk about. Compared with the frustration of not being promoted, whether they are respected is what they value more.

Therefore, as the captain of the criminal police detachment, Yi Qin Shi Huang does not like the task of being assigned to arrest suspects.

Of course, the special case with the code name 828 is still very material. Any cold case is a high-end product in the criminal police team. It is not that you can restart it if you want, and you can investigate it casually if you want.

However, not needing to investigate by himself, but directly going to arrest a suspect and bring him back for interrogation, Yi Qin Shi Huang still felt that he was underestimated. This feeling is like a classmate gathering, eating his own month's salary, and then someone pays for it carelessly.

Yi Qin Shi Huang didn't want to pay, and didn't feel he needed to pay, but he felt he could still afford this money, and felt that this person was pretending to be too much.

With strange emotions, Yi Qin Shi Huang came outside the criminal suspect's residence and sent someone to knock on the door.

The criminal suspect is a person released from prison. The home address is registered clearly. Being knocked on the door by the police, he also looked innocent and smiled: "What's the matter again."

"Your matter has been committed, come with us." The police didn't have a good face for him either, showed his ID, and was about to take people away.

Thud.

Not far behind the door, a sound came.

Yi Qin Shi Huang frowned and immediately waved his hand.

The police officer at the door pulled the criminal suspect into his arms, stuck his chest, and whispered in his ear: "Who else is at home?"

The criminal suspect smiled: "There is a friend staying... you be lighter, my collarbone has been injured..."

The police officer dragged him to the back before loosening a little.

At this time, Yi Qin Shi Huang had already followed three other police officers into the room.

In the room, there was another man who was thin as a bamboo pole, piling up smiles.

"Do you take drugs?" Yi Qin Shi Huang asked after taking a look at him.

In these years, seeing a man of the thin and bony type, ask him two questions: Are you sick? Are you very poor?

If both answers are negative, then it is drug use.

Yi Qin Shi Huang skipped the first two questions this time. A thin and bony man staying in the room of a criminal suspect released from prison, first ask about drug use and then ask about poverty, absolutely no problem.

The man thin as a bamboo pole in the room smiled awkwardly. He looked at the strong police officer in front of him, then looked at the window, then at the door, and finally sighed: "Occasionally take some."

"Take it away." Yi Qin Shi Huang was too lazy to ask. This kind of person is definitely a second-timer, knowing that he can't escape the rapid drug test, so he confessed directly.

After entering the interrogation room for a while, this kind of person will also pour beans out of a bamboo tube.

A team of police officers entered and exited quickly and soon returned to the Municipal Bureau Criminal Police Detachment.

Then send someone to interrogate, and take out the evidence of the bloody handprint. The main person who opened the door confessed faster than the drug-taking monkey.

The interrogation police officer made persistent efforts, seized the time, and asked everything before getting off work.

When he came out to report to Yi Qin Shi Huang, Yi Qin Shi Huang was actually a little trance-like.

"Is the 828 case solved?" Yi Qin Shi Huang didn't know that many police officers had said what he said.

The interrogation police officer had a face of emotion: "This guy was also a drug user before, an old acquaintance with the victim. He didn't borrow money, and under emotional excitement, he killed the person. Because the relationship between the two sides was established ten years ago, the previous case handlers didn't find him."

"Okay... interrogate again tomorrow, I'll report to the leader."

Yi Qin Shi Huang had a drunken feeling, as if his cognitive world had been hit.

Soon, the impact was truly transmitted to the leaders of the Luojin Municipal Bureau.

The idea of "Are we at a loss?" collided with the idea of "Are we stupid before?", and they could never merge. ===== CHAPTER 515 =====