Chapter 20 Crime Scene Investigation

Chapter 20 Crime Scene Investigation

Wu Jun sighed, stood up, walked to the door, closed the door and locked it, all at once.

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

There were two strands of red cord at the top of the pendant for hanging around the neck, but Wu Jun stretched out his body and hung it directly behind the office door.

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

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

Wu Jun said with a sullen face, "Do you know where I, Guan Yu, come from?"

"Where...are you from?"

"Eight years ago, the Hong Kong police force went to Shannan Province for police exchange. A police officer sold... half sold and half given to me." Wu Jun put his hands together and bowed to Guan Yu, saying: "You know, our national police force... The service system is actually learned from Hong Kong. The Shenzhen Police Force learned the best, that is, they communicated the most, made more money, and learned the same. And, don’t tell me, the Hong Kong Police Force has indeed had many of us over the years. A place to learn.”

"Looking at the TV series, Hong Kong's forensic doctors seem to be quite powerful." Jiang Yuan walked over.

Wu Jun curled his lips and said, "Then I don't know. They didn't have forensic doctors here 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, it is quite simple.

Wu Jun ignored what he said and commanded: "Bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah, bah."

Jiang Yuan said bah, bah, bah, then obediently clasped his hands together, bent down and bowed.

In his home, there are many ornaments such as Guan Gong, Bodhisattva, Maitreya Buddha, Sanqing, crosses, jadeite, Hetian jade, or precious stones, but they are not too particular.

Wu Jun waited for him to finish praying, 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: "When learning knowledge, we can't stick to the knowledge in books, right. "

Jiang Yuan: "Yes, yes."

Wu Jun looked down at his phone and said with satisfaction: "Look, there is no call. What does it mean? It means that what we just prayed for was effective."

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

In the evening, Captain Huang Qiangmin called Jiang Yuan, but it turned out that the gang theft case had made progress. The suspect in the prison confessed to many accomplices.

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

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

The so-called secrecy is actually quite common in criminal cases.

Modern people all know that fingerprints can be traced back to themselves, and there may be cameras wherever there are people. However, when it comes to committing a crime, it is still a minority among the few who can always notice that they are hiding themselves.

Wearing gloves during a crime is easy, but before and after wearing gloves, it does not necessarily guarantee that you will not touch items at the scene. Some suspects have finished the case and then remember that they left something behind, or accidentally touched the door handle. Objects like that...

Things like forgetfulness and careless mistakes happen all the time. They are not only common in ordinary people's work and life, but also occur in criminals' criminal processes and even their criminal careers.

Coupled with multiple confessions and physical evidence such as modified vehicles, it will be difficult for several people to escape some of the guilt.

At this stage, Jiang Yuan was only cooperating with some review and comparison work.

Fingerprints that were difficult to match before can now be matched easily with real people. And the young people in the gang have left a deep mark on the official system. If you commit another crime in the future, you don’t have to worry about not winning!

This week, when the weekend came, when Jiang Yuan was already thinking about how to spend the weekend, Wu Jun's cell phone began to vibrate rhythmically.

Wu Jun only glanced at it, his expression changed, he immediately picked up the call, and responded: "Team Yellow."

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

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

Wu Jun also had a solemn look on his face. After sorting out his equipment, he touched the Guan Gong box in the drawer, sighed, and said to Jiang Yuan: "You see, worshiping can at least stop it for a week, but , after all, you still can’t escape.”

…

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

The on-site investigation vehicle is an essential piece of equipment at the county bureau level and must be purchased no matter how poor you are. However, those who have money can buy good, professional and large cars, and those who have no money can also use them if they are modified by the county bureau.

In the car, there are all kinds of equipment that have been prepared, including various types of investigation boxes, various evidence bags, various tapes, powders and small brands, etc. At the same time, space is reserved for parking the corpse, which can save technicians a lot of preparation time.

Jiang Yuan was slightly nervous and excited.

He completed five years of forensic medicine at a medical university. I went to class, reviewed, worked on projects, and worked on papers. After doing the whole thing, there was only one corpse that I actually saw at the crime scene. If I went to the scene again, I would be lying if I said I wasn't excited.

When we arrived at a small red-brick building in the suburbs, the police officers who came first had already made arrangements. Several police cars parked casually downstairs, and several police officers dispersed to question people watching and walking in the yard.

Jiang Yuan showed his ID, then picked up the box 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. It was surrounded by chaos and residents of the building were watching.

Jiang Yuan, who had obtained Crime Scene Investigation LV4 just two days ago, frowned unconsciously as he looked at this scene.

Jiang Yuan, who was still just a newcomer, was not qualified to speak. He showed his ID again and entered the room with his head lowered.

Rooms made thirty or forty years ago were generally small in size, only about forty square meters. The living room was indirectly lit, and a larger bedroom was brightly lit, but there were multiple police officers inside, plus a lying body. Feeling cramped is inevitable.

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

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

Jiang Yuan put on a mask, gloves, hat, goggles, etc., then stood next to Wu Jun and observed the body.

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

Criminal scene photography is also a specialized category. Especially before digital cameras became popular, police officers holding professional cameras needed to use as little film as possible to present extremely rich information, and they had to practice for several years before they could really get started.

When it comes to shooting, a complete criminal scene photography requires on-site orientation photography, overall scene photography, scene center photography, on-site detail photography, and other methods such as opposite shooting, cross shooting, segmented shooting, etc. Be particular about it.

However, after losing the cover of film, the position of criminal scene photography in small places was quickly covered by on-site investigation. If necessary, criminal police can also do it, forensic doctors can do it, and traffic police can also do it.

Of course, basic requirements still have to be met, especially in serious cases, the police still try their best to operate in accordance with the regulations. For example, when taking pictures of corpses, they must be taken vertically, instead of casually taking pictures from the side like ordinary people take pictures.

Jiang Yuan waited for the photos to be taken and then followed his master Wu Jun to do a physical examination of the corpse.

Forensic medicine is a profession that requires a wealth of experience. Even after five years of medical school, Jiang Yuan still had to learn it bit by bit from Wu Jun.

Wu Jun also took a few photos, especially the items 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 catch his breath. He glanced helplessly and said, "There's no way I know them all."

"You are a native of Ningtai County, maybe you can meet a classmate or friend." Wu Jun waited for Jiang Yuan to take a closer look, then sighed with regret and said, "If you really don't know him, you can only look for him from the beginning. .I said you should record it.”

"One male corpse, 170 centimeters long...pale skin...black hair, intact scalp..." Wu Jun said while checking Jiang Yuan's records, nodding frequently.

Jiang Yuan's records were quite standardized and even more detailed. For example, he noted the position and posture of the corpse at the beginning, as well as the pale skin, and then added "no jaundice"...

From Wu Jun's perspective, Jiang Yuan, who could do this, was more like a colleague than an apprentice.

Jiang Yuan himself also became more and more emotional as he wrote.

The scope and depth of the newly acquired skill "Crime Scene Investigation (LV4)" is far greater than he imagined. It includes not only spot investigation in the usual sense, but also forensic spot inspection and trace inspection. wait.

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

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

Jiang Yuan suppressed his inner thoughts and carefully completed the autopsy examination with Wu Jun. Then, the two began to examine and extract DNA test materials.

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

Jiang Yuan first went around the body to extract hair and skin flakes. Although there is a high possibility that it belongs to the victim, this can only be determined after an examination.

Trace evidence surrounding the body is generally considered more reliable and therefore requires extra careful examination. Wu Jun is getting older, and although he is not as old-sighted as he is, his sensitivity to detailed small physical evidence is somewhat weakened.

Jiang Yuan, on the contrary, 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. Bending over a half-height bed for an examination was 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 did not feel tired at all. After he had clearly extracted the physical evidence around the body, he began to extract blood evidence.

I saw that he first selected a pool of blood from the thigh of the corpse, dipped a cotton swab into the blood, and instead of throwing it directly into the evidence bag, he took another piece of filter paper, wrapped the cotton swab, and then wrapped it into a triangle.

This action alone caught the attention of Xian Kan and Wu Jun next to them.

His operation is easy for others to understand. The cotton swab that absorbs blood is put directly into the evidence bag. It is easy to be contaminated, and it is easy for blood to seep out of the evidence bag, which will cause secondary contamination - in order to avoid Corruption, biological test materials cannot be stored in plastic evidence bags. Secondly, if the physical evidence has been stored for a long time, the blood in the cotton swab will dry easily, which is not conducive to verification and secondary use.

However, when wrapped in filter paper, the situation is different. The blood seeping out of the cotton swab is easily absorbed by the filter paper, and with the water absorption capacity of the filter paper, there is no need to worry about it seeping out again. When it's time to use it in the laboratory, just cut off a little of the filter paper on it, which is enough for DNA testing, and the rest is still easy to store.

I understand, but for the investigator who pours multiple cigarette butts into an evidence bag every day, no one really told him that he can do this.

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

Wu Jun calmly shook his waist and said slowly: "There are some operations that I am just too lazy to do."