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 under the victim’s fingernails, and other evidence from the victim’s private parts and underwear.
Lubricant, etc., but there is no conclusive physical evidence.
Jiang Yuan did not extract this part of the physical evidence and returned to the laboratory with the clothes.
Compared with the human body itself, pollen remains on textiles for a longer period of time. Especially for certain pollen compared to certain textiles, due to the appropriate size, the pollen can even remain 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, giant claw grass, mugwort pollen, etc. were found in it. It is obvious that these pollen 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 the stereomicroscope of the trace evidence laboratory.
There are pollen and sporopollen 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 bit of 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 does not require any advanced skills, as long as you have good skills.
"I'll check it first, and I'll make a sample of the pollen later, so prepare it." Jiang Yuan told the technicians in the microevidence laboratory while using a stereo microscope to look at the pollen in the clothing fibers and pinching them out.
A stereomicroscope can observe pollen very well, but it is not enough to be used as evidence in court.
What you see with a stereomicroscope is the complete individual pollen, but the specific hairs, furrows, tines, and teeth on the pollen body are not very clear 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. Most school biology laboratories use this kind of microscope. If you can see the cell structure, you can naturally see it clearly.
Details of pollen.
The technicians in the trace evidence laboratory immediately started busy preparations.
The 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 the same appearance together and giving you an encyclopedia of birds to tell you what species they belong to.
Or, to be more specific, send a bunch of photos of microorganisms, give them a book called 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. There are many old detectives in the criminal police team. They have experienced suffering, believe in suffering, and trust suffering.
They enjoy wearing the soles of their shoes in order to detect a case. Being respected is what they value more than the disappointment of not being promoted.
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, there was no need to investigate on his own, and he went directly to arrest a suspect and bring him back for interrogation. Yi Shihuang felt that he had been underestimated. This feeling was like a classmate having a dinner party, eating one month's salary, and then someone carelessly...
Paid.
Yi Shihuang didn't want to pay, and he didn't think 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: "I have a friend staying overnight... please be gentle, my collarbone has been injured..."
The policemen dragged him to the back and relaxed a little.
At this time, Yi Shihuang had followed three other police officers into the room.
In the room, there was another man who was as thin as a bamboo pole and was 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 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 asked about drug abuse and then asked 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. He must have 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 a special person to interrogate and bring out the evidence of the bloody fingerprints. The real person who opened the door can explain faster than a drug-addicted monkey.
The interrogating police officers continued their efforts, seized the time, and got to the bottom of the matter before getting off work.
When he came out to report to Yi Shihuang, Yi Shihuang was a little confused.
"Even if 828 Eucalyptus is 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 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 handling personnel also failed to find him."
"Okay... we will review it tomorrow and I will 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.
