civil forensic

Chapter 541
End of the meeting.

Jiang Yuan followed Pang Jidong, the captain of the Fourth Brigade, to the evidence room and took the main evidence, that is, all the clothes of the four victims.

In addition, the criminal science and technical personnel on that day also took some other physical evidence from the victim, including some small grass blades or leaves, the soil and fibers in the victim's fingernails, and the remains of the victim's lower body and underwear. Lubricating fluid, etc., but there is no conclusive physical evidence.

Jiang Yuan did not extract this part of the evidence, so he returned to the laboratory with his clothes.

Pollen lasts longer on textiles than on the human body itself.Especially if some pollen is compared to some textiles, because of the appropriate size, the pollen can even stay for several months or even longer without being lost.

In fact, the most practical application of pollen research is in archaeology. A typical example, archaeologists have self-spun fabrics from Iron Age tombs, one with well-preserved clothing and hair. Pollens of cultivated crops and herbs such as rye, barley, giant claw, and mugwort pollen were found in it. These pollen obviously could not be caused by pollution during burial, but old ones stored in textiles.

Pollen with a chitin-like polymer shell, if it can be enlarged to the scale of a building, its defense performance is stronger than the defense of the strongest fortress of human beings, 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 proves this point.

There are pollen and sporopollen on every piece of clothing, and there are a lot of them.

If it is not specially cleaned, it should be like this in normal people's clothes-a life trick derived from this, how to know whether the clothes you bought from Taobao are brand new or returned after being worn by others, how much does it cost? Buy a stereo microscope from Taobao for [-] yuan, and you will know the amount of plant pollen in the fabric.

If you read more books and have more knowledge, you can also judge the living environment and even the 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 the stereo microscope, it is not difficult. The most common scenes of similar models are watch repair masters, mobile phone repair masters' workbenches, engraving and antique identification, and this type of microscope is also used.

Therefore, it doesn't take much advanced skills to find an ex, as long as you have hands.

"I'll check it first, and I'll do a pollen sample later, so prepare it." Jiang Yuan told the technicians in the trace evidence laboratory while looking at the pollen in the fibers of the clothes with a stereo microscope and clamping them out.

Stereo microscopes are good enough to see pollen, but not enough for court evidence.

What the stereo microscope sees is the complete pollen individual, but the hairs, grooves, penises, teeth and the like on the pollen body are not clearly seen by the stereo microscope.

At this time, a compound microscope is needed, that is, a microscope with a glass slide and a light source coming from below.Most of the school biology laboratories use this kind of microscope. Those who can see the cell structure can naturally see the specific situation of the pollen.

The technicians in the trace evidence laboratory immediately got busy preparing.

Putting the pollen on the glass slide requires additional processing, and it will take a little time.

Jiang Yuan first counted the larger, easily identifiable pollen and recorded it.

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

At the very least, it would take several days for a botanist who barely reached LV2 to make a proof after getting a Ph.D. and working in the field of pollenology for three to five years.

It's like mixing a group of birds of the same appearance together, giving you a book of bird encyclopedias, and asking you to identify their species.

Or, to be more specific, post a bunch of pictures of microbes, give them a book called The Encyclopedia of Microbes, and identify them.

Ordinary botanists really search with books.

Most people only study a small number of fields they are familiar with, such as those who specialize in pine trees, or those who specialize in birch forests and associated 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 and used temporary skills to Forensic Botany LV4, a very buggy point is that the number of book searches has been greatly reduced, and the levels that need to be searched have been delegated, which can save a lot of time.

……

Yi Shihuang, the captain of the second brigade, also saved time.

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

In order to solve a case, they like to walk through the soles of their shoes. Compared with the frustration of not being promoted, whether they are respected or not is what they value more.

Because of this, as the captain of the criminal police detachment, Yi Shihuang didn't like being assigned the task of arresting suspects.

Of course, the project code-named 828 is still very predictable. Any homicide backlog is high-end in the criminal police team.

However, Yi Shihuang felt that he had underestimated himself by directly arresting a suspect and bringing him back for interrogation without conducting his own investigation.This kind of feeling is like having a dinner with classmates, eating one's salary for a month, and then someone pays the money carelessly.

Yi Shihuang didn't want to pay, and he didn't feel that he needed to pay, but he felt that he could still afford the money, and felt that this person was too aggressive.

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

The suspect was released after serving his sentence, and his home address was clearly registered. When the police knocked on the door, he looked innocent and said with a smile, "What's the matter?"

"You've committed a crime, come with us." The police didn't look good on him, and after showing his ID, he was about to take him away.

Gudong.

Not far behind the door, there was a voice.

Yi Shihuang frowned, and immediately waved.

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

The suspect smiled: "I have a friend staying overnight... Take it easy, my collarbone was injured..."

The policeman dragged him to the back, and then he relaxed a little.

At this time, Yi Shihuang had entered the room with three other police officers.

In the room, another man who was as thin as a bamboo pole was laughing.

"Are you taking drugs?" Yi Shihuang asked with a glance at him.

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

If the answer is no to both, it is drugged.

Yi Shihuang skipped the first two questions this time.There is absolutely nothing wrong with a skinny man who sleeps in the room of a criminal suspect who has been released after serving his sentence.

The man in the room who was as thin as a bamboo pole 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: "Once in a while."

"Take it away." Yi Shihuang didn't even bother to ask, this kind of person must have entered the palace twice, knowing that he couldn't escape the quick drug test, so he confessed directly.

After entering the interrogation room, this kind of person will also pour beans from bamboo tubes.

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

Then send a special person to interrogate and take out the evidence of bloody fingerprints.The master who opened the door explained it faster than the drug-addicted monkey.

The interrogation police made persistent efforts, seized the time, and asked the whole question before leaving get off work.

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

"The 828 case will be solved?" Yi Shihuang didn't know, what he said had been said by many policemen.

The interrogating policeman was full of emotion: "This guy was also a drug addict before. He was an old acquaintance with the victim. He didn't borrow the money. He was emotional and killed him. Because the relationship between the two parties was established ten years ago. , the previous investigators did not find him."

"Okay...the trial will be held tomorrow, and I will report to the leader."

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

Soon, the real sense of impact was transmitted to the leaders of the Luojin City Bureau.

The idea of ​​"Did we lose money?" collided with the idea of ​​"Are we stupid before?", and they still couldn't integrate.

(End of this chapter)