National Forensic Doctor

End of the meeting.

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

In addition, the criminal science and technology personnel that day also collected some other physical evidence from the victim, including some small blades of grass or leaves, soil and fibers from between the victim's fingernails, and other evidence remaining on the victim's lower body and underwear. Lubricant, etc., but there is no conclusive physical evidence.

Jiang Yuan returned to the laboratory with the clothes without extracting this part of the physical evidence.

Pollen remains on textiles longer than on the body itself. Especially for certain pollen compared to certain textiles, due to the appropriate size, the pollen can even be retained for several months or even longer without being lost.

In fact, the most practical application of pollen research is in archeology. A typical example is that archaeologists woven textiles from an Iron Age tomb that contained well-preserved clothing and hair. Pollen from cultivated crops and herbaceous plants such as rye, barley, macroclaw, mugwort pollen, etc. was found. These pollens obviously cannot be caused by contamination during burial, but are old and present in textiles.

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

This was also proven by the performance of the evidence under a stereomicroscope in the trace evidence laboratory.

Pollen and sporopollen are found on every piece of clothing, and there are a lot of them.

Without special cleaning, normal people's clothes should look like this - a little life trick derived from this, how to know whether the clothes you bought from Taobao are brand new or have been worn and returned? How much does it cost? You can buy a stereomicroscope from Taobao for 100 yuan and just look at the amount of plant pollen in the fabric.

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

If you have enough time and a little luck, you might be able to locate the address of the previous owner.

As for the operation of stereo microscopes, it is not difficult. The most common scenes of similar models are on the workbench of watch repairmen and mobile phone repairmen. Those who do engraving and antique appraisal also use this type of microscope.

Therefore, finding your ex doesn’t require any advanced skills, as long as you have the skills.

"I'll check it first, and I'll make a sample of the pollen later. You should prepare it." Jiang Yuan told the technicians in the trace evidence laboratory while using a stereo microscope to look at the pollen in the clothing fibers and pinching them out.

A stereomicroscope can be used to observe pollen very well, but it is not sufficient for forensic evidence.

What a stereomicroscope can see is the complete individual pollen, but the specific hairs, furrows, tines, and teeth on the pollen body cannot be seen clearly with a stereomicroscope.

At this time, you need to use a compound microscope, which is a microscope with a slide and a light source coming up from below. This kind of microscope is used in most school biology laboratories. If you can see the cell structure, you can naturally see the specific situation of pollen clearly.

The technicians in the trace evidence laboratory immediately started busy preparations.

Pollen on the slide requires additional processing and takes some time.

Jiang Yuan first counted the larger, easily identifiable pollen and kept records.

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

At the very least, a botanist who has barely reached LV2 after getting a PhD and working in the field of pollenology for three to five years will have to spend several days to make a piece of evidence.

It's like mixing a group of birds with similar looks together and giving you a bird encyclopedia book to let you distinguish their species.

Or, to be more specific, send a bunch of photos of microorganisms and a book called The Encyclopedia of Microorganisms, and then identify them.

Ordinary botanists really search with books.

Most people only delve into a small number of fields that they are familiar with, such as those who specialize in pine trees, or those who specialize in birch forests and accompanying plants.

After expanding to the whole field, the complexity of this work will be greatly increased, and the practicality will be greatly reduced.

After Jiang Yuan upgraded Forensic Botany LV3 to Forensic Botany LV4 using temporary skills, a very buggy point was that the number of book searches was greatly reduced, and the levels that needed to be searched were decentralized, which saved a lot of time.

…

Also saving time was Yi Shihuang, the captain of the second brigade.

Yi Shihuang is a traditional old detective. There is nothing to say about this. There are many veteran detectives in the criminal police team. They have experienced suffering, believe in suffering, and trust in suffering.

In order to detect a case, wearing the soles of shoes is their capital that they talk about. Compared with the disappointment of not being promoted, whether they are respected by others is something they value more.

Therefore, as the captain of the criminal police detachment, Yi Shihuang did not like being assigned the task of arresting suspects.

Of course, the project codenamed 828 is still very interesting. Any fatal case is a high-end product in the criminal police team. You can't just restart it if you want, and you can investigate it at will.

However, Yi Shihuang felt that he had been underestimated because he did not need to investigate on his own and went directly to arrest a suspect and bring him back for interrogation. This feeling is like classmates having a dinner together, eating one month's salary, and then someone carelessly paid.

Yi Shihuang didn't want to pay, nor did he feel that he needed to pay, but he felt that he could still afford it, and he felt that this person was too pretentious.

With strange emotions, Yi Shihuang arrived outside the suspect's residence and sent someone to knock on the door.

The suspect is a person who has been released from prison. His home address is clearly registered. When the police knocked on the door, he looked innocent and said with a smile: "What's going on?"

"You've committed a crime, come with us." The police didn't look kindly on him. They showed their ID and wanted to take him away.

Gudong.

There was a voice not far behind the door.

Yi Shihuang frowned and immediately waved.

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

The suspect smiled and said: "A friend is staying overnight... please be gentle, my collarbone has been injured..."

The policemen dragged it behind and relaxed it a little.

At this time, Yi Shihuang had followed three other police officers into the room.

In the room, there was another man as thin as a bamboo pole, smiling.

"Are you taking drugs?" Yi Shihuang asked after taking a look at him.

These days, when I see a skinny man, I ask him two questions: Are you sick? Are you quite poor?

If both answers are negative, then you are taking drugs.

Yi Shihuang skipped the first two questions this time. There is absolutely nothing wrong with a skinny man who stays in the house of a criminal suspect who has been released from prison. He first asks about drug addiction and then asks about poverty.

The thin man in the room laughed a few times. He looked at the strong policeman in front of him, then at the window, then at the door, and finally sighed: "Suck some occasionally."

"Capture him." Yi Shihuang didn't even bother to ask. This was definitely someone who had been in the palace for the second time. He knew that he couldn't escape a quick drug test, so he confessed directly.

Once you enter the interrogation room, this kind of person can also pour beans out of a bamboo tube.

A group of police officers rushed in and out, and soon returned to the criminal police detachment of the city bureau.

Send someone special to interrogate and bring out the evidence of bloody fingerprints. The real person who opened the door gave instructions faster than a drug-addicted monkey.

The interrogating police officers kept up their efforts, seized the time, and got to the bottom of it before getting off work.

When he came out to report to Yi Shihuang, Yi Shihuang was a little confused.

"Is 828 Eucalyptus broken?" Yi Shihuang didn't know that what he said had been said by many police officers.

The interrogating policeman expressed emotion: "This guy was also a drug addict before, and he was an old acquaintance of the victim. He couldn't borrow the money, so he got emotional and killed the person. Because the relationship between the two parties was established ten years ago. , the previous handlers couldn’t find him.”

"Okay... we'll review it tomorrow and I'll report to the leader."

Yi Shihuang felt a little drunk, as if his cognitive world had been hit.

Soon, the real sense of impact was conveyed to the leaders of the Luojin Municipal Bureau.

The thought "Did we lose money?" and the thought "Did we be stupid before?" collide with each other and can never be integrated.