civil forensic

Chapter 20 Crime Scene Investigation
Wu Junchang sighed, stood up, walked to the door, closed it and locked it, all in one go.

When he came back again, Wu Jun ignored Jiang Yuan's expression, took out a small box from the drawer, and opened it, but it was a red Guan Yu pendant that was only one finger long and half a finger wide.

There are two red strings on the top of the pendant, which are used to hang around the neck, but Wu Jun stretched his body and hung it directly behind the office door.

"Come here and say goodbye." Wu Jun said, "Be careful when you speak in the future."

"This..." Jiang Yuan hesitated for a moment, and said, "Is it appropriate for us to pay homage to Guan Yu in the bureau?"

Wu Jun sullenly said, "Do you know where I, Guan Yu, come from?"

"Where... did you come from?"

"Eight years ago, the Hong Kong police force went to Shannan Province to do a police exchange. A police officer sold... half sold and half given to me." Wu Jun folded his hands and bowed to Guan Yu, saying: "You know, our national police In fact, they are all learning from Hong Kong. The Shenzhen Police Force has learned the best, that is, they have the most exchanges, and they have a lot of money, so they learn like them. And, don’t tell me, the Hong Kong Police Force has indeed learned a lot from us over the years. A place to study."

"Watching TV shows, the forensic doctors in Hong Kong seem to be pretty good." Jiang Yuan walked over.

Wu Jun curled his lips: "Then I don't know, they didn't have a forensic doctor last time."

"So, you exchanged and learned the skills of worshiping Guan Gong?" Jiang Yuan saw that the Guan Gong pendant was made of agate, and thought to himself, it is quite simple.

Wu Jun ignored what he said, and commanded: "Beep three times first, and then bow again. If there are fewer cases, we can relax and the society will be harmonious, right?"

Jiang Yuan pee, pee, then obediently put his hands together, bent down and bowed.

There are also a lot of Guan Gong, Bodhisattva, Maitreya Buddha, Sanqing, crosses and other hanging ornaments in his family, or jadeite or Hetian jade or gemstones, and he doesn't pay much attention to them.

Wu Jun waited for him to finish worshiping, looked at the sky, breathed a sigh of relief, put it in the box, put it in the drawer, reopened the office door, and said to Jiang Yuan: "To learn knowledge, we can't stick to the knowledge in books, right. "

Jiang Yuan: "Yes, yes, yes."

Wu Jun looked down at his mobile phone and said with satisfaction: "Look, there is no call. What does it mean? It means that the prayer we just made has worked."

Jiang Yuan nodded in agreement, and silently opened the novel "The Great Doctor Ling Ran" to read.

In the evening, the team leader Huang Qiangmin called Jiang Yuan, but the gang theft case had progressed, and the suspects in the prison confessed to several accomplices.

In the next two days, the updated news was all about gang theft.

The suspects captured by the criminal police team had their fingerprints printed again, and compared with the fingerprints left in the case, more and more cases were confirmed.

The so-called "one hundred secrets and one sparseness" is actually quite common in criminal cases.

Modern people know that fingerprints can trace them, and there may be cameras wherever there are people, but when it comes to committing crimes, those who can always notice and hide themselves are still a minority of the minority.

It is easy to wear gloves during a crime, but before and after wearing gloves, there is no guarantee that you will not touch the objects at the scene. Some suspects, after finishing the case, remember what they left behind, or accidentally touch the doorknob Objects like...

Things like forgetting things and forgetting things, making mistakes inadvertently, and so on are common to ordinary people, not only may occur in ordinary people's ordinary work and life, but also in criminals' criminal process and even in their criminal career.

Coupled with multiple confessions and physical evidence such as modified vehicles, it is very difficult for several people to escape part of the crime.

At this stage, Jiang Yuan is only cooperating with some re-examination and comparison work.

Fingerprints that were difficult to match before, now have real people, and it is easy to match them.And the young people in the gang have left a deep imprint in the official system.If you commit another crime in the future, you don’t have to worry about losing the match!
Such a week, when the weekend came, and Jiang Yuan was already thinking about how to spend the weekend, Wu Jun's cell phone vibrated rhythmically.

Wu Jun just glanced at it, his expression changed, and he immediately picked it up, and replied, "Team Yellow."

After a few words, Wu Jun ended the call and said in a clear voice: "There is a murder case, prepare in 3 minutes, take my investigation box, and take the trace inspection car to the crime scene."

"Yes." Jiang Yuan replied, his heart beating fast.

Wu Jun also had a dignified expression, and only after finishing his equipment, he touched the Guan Gong box in the drawer, sighed, and said to Jiang Yuan: "Look, a bow can at least block a week, but , I still can’t hide from it after all.”

……

Wu Jun and Jiang Yuan rushed to the scene as quickly as possible in the on-site investigation vehicle modified by Iveco of the Criminal Division Squadron.

On-site survey vehicles are necessary equipment at the county bureau level, and no matter how poor they are, they have to buy them.However, those who have money can buy professional and big cars, and county bureaus without money can also use them.

Inside the car, there are all kinds of equipment that have been prepared, including various types of investigation boxes, various evidence bags, various small brands of tape powder, and so on.At the same time, a space for storing corpses is also reserved, which can save technicians a lot of preparation time.

Jiang Yuan was slightly nervous and excited.

He had completed five years of forensic medicine at the medical university.Attending classes, reviewing, working on projects, working on papers, and doing the whole set, but there is only one dead body that was actually seen at the crime scene. If you go to the scene again, it would be a lie to say that you are not excited.

When we arrived at a small red brick building in the suburbs, the police officers who had arrived earlier had already placed control. Several police cars parked casually downstairs, and some police officers dispersed to interrogate the people watching and walking in the yard.

Jiang Yuan showed his ID, carried the suitcase, and quickly climbed up to the third floor with Wu Jun.

The room where the incident occurred was less than ten meters away from the stairs, and the surroundings were in a mess, and there were residents in the building watching.

Jiang Yuan, who obtained the crime scene investigation LV4 only two days ago, frowned unconsciously as he watched this scene.

Jiang Yuan, who was just a newcomer, was not qualified to speak, so he flashed his ID again and entered the room with his head down.

Three or 40 years ago, the room area was generally small, about [-] square meters, with indirect lighting in the living room, and a larger bedroom with bright light, but there were many police officers and a lying corpse in it, which was cramped. Feeling inevitable.

Fortunately, the smell of fresh corpses is acceptable, making the environment in the room acceptable.

"Put it on first." Wu Jun looked serious and motioned Jiang Yuan to open the inspection box.

After Jiang Yuan put on his mask, gloves, hat, goggles and other things, he stood beside Wu Jun and observed the corpse by the way.

The deceased, wearing only a pair of briefs, was lying naked on the bed with a knife in his chest, bleeding profusely.Jiang Yuan looked down, the blood almost soaked the dirty carpet in the bedroom, and the surveyor next to him was stepping on a stool, taking pictures from top to bottom.

Criminal scene photography is also a specialized category, especially before the popularity of digital cameras, police officers with professional cameras need to use as little film as possible to present extremely rich information, and they have to practice for several years before they can really get started.

When it comes to shooting, the complete criminal scene photography requires on-site azimuth photography, on-site panorama photography, on-site center photography, on-site detailed photography, and methods such as facing each other, crossing, and sectioning, etc. pay attention to.

However, after losing the cover of film, the job of criminal scene photography in small places was quickly covered by spot surveys. If necessary, criminal police, forensic doctors, and traffic police can also do it.

Of course, there are still basic requirements, especially in major and extraordinarily serious cases, the police still operate in accordance with the norms as much as possible.For example, when shooting a corpse, it must be taken vertically, instead of taking pictures from the side as ordinary people take pictures.

After Jiang Yuan finished taking pictures, he followed his master Wu Jun to do a physical examination of the corpse.

Forensic medicine is a profession that requires a lot of experience. Even if he has studied in a medical university for five years, Jiang Yuan still has to learn from Wu Jun little by little.

Wu Jun also took a few photos, especially the objects around the corpse, and then turned to Jiang Yuan and said, "Look at this corpse, do you recognize it?"

"I..." Jiang Yuan almost couldn't get up in one breath, so he glanced helplessly and said, "How could I know everyone."

"You are a native of Ningtai County, maybe you can meet a classmate or friend." Wu Jun waited for Jiang Yuan to look carefully before sighing regretfully, and said: "If you really don't know each other, you can only look for it from the beginning. .I said you to record it."

"A male corpse, 170 centimeters long... Pale skin... Black hair, intact scalp..." Wu Jun said while checking Jiang Yuan's records, unconsciously nodding frequently.

Jiang Yuan's record is quite standardized, even more detailed. It seems that the position and posture of the corpse are marked at the beginning of the chapter, the skin is pale, and the sentence "no yellow stain" is added at the end...

From Wu Jun's point of view, Jiang Yuan who can do this is more like a colleague than an apprentice.

Jiang Yuan himself felt more and more as he wrote.

The scope and depth of the newly acquired skill "Crime Scene Investigation (LV4)" are far greater than he imagined. It includes not only on-site inspection in the usual sense, but also forensic on-site inspection and trace inspection on-site inspection, etc. Wait.

In the current forensic investigation, the autopsy is also included.

In this way, the role of crime scene investigation (LV4) is quite large.

Jiang Yuan suppressed his inner thoughts and seriously finished the autopsy with Wu Jun. Then, the two began to examine and extract DNA samples.

The so-called DNA test material refers to physical evidence that may contain DNA, such as blood stains, semen spots, saliva spots, or isolated drops of blood.

Jiang Yuan first walked around the corpse, extracting hair and dander.While there is a strong possibility that it was the victim's own, that can only be determined after an examination.

Trace evidence around the corpse is generally considered to be more reliable, so extra careful inspection is required.Wu Jun is getting old, although he is not to the point of being dizzy, but his sensitivity to detailed small physical evidence has weakened somewhat.

Jiang Yuan was just the opposite, and quickly extracted a variety of physical evidence, several of which Wu Jun didn't even see clearly.

Seeing this, Wu Jun simply took the opportunity to straighten up and relax for a while.Bending down in front of a half-height bed for an examination is the most uncomfortable thing for an old man of his age.

Jiang Yuan was a young man who had just graduated. He was in good health and had just acquired skills. He didn't feel tired at all. After extracting the physical evidence around the corpse, he began to extract blood evidence.

I saw that he first chose a lump of blood on the thigh of the corpse, stained it with a cotton swab, and instead of throwing it directly into the evidence bag, he took another piece of filter paper, wrapped it around the cotton swab, and wrapped it into a triangle.

Just this action caught Xian Kan and Wu Jun next to him.

His operation is easy for others to understand. The cotton swab that has sucked blood is directly put into the evidence bag, which is easy to be contaminated, and it is easy to ooze blood from the evidence bag, which will form secondary pollution—to avoid Corruption and biological inspection materials cannot be preserved in plastic evidence bags.Secondly, the physical evidence has been stored for a long time, and the blood in the cotton swab is easy to dry, which is not conducive to verification and secondary use.

However, if you wrap it with filter paper, the situation is different. The blood oozing from the cotton swab is easily absorbed by the filter paper, and with the water absorption capacity of the filter paper, you don't have to worry about seeping out again.When it comes to laboratory use, just cut off a bit of the filter paper above, it is enough for DNA testing, and the rest is still good for storage.

Understanding is understandable, but for the surveyor who pours multiple cigarette butts into an evidence bag on a daily basis, no one really told him that he could do this.

"Where did you find this apprentice?" Xian Kan asked Wu Jun in surprise.

Wu Jun shook his waist calmly, and said slowly, "I'm just too lazy to do some operations."

(End of this chapter)