Department of Psychology Forensic

Chapter 56 Important Evidence!

Cui Jun took the tweezers and carefully picked up a thing filled with a khaki-yellow substance from the small intestine. It looked like a small bag, murmured, and contained things in it, which had not been damaged.

"If I'm not mistaken, it's a used condom with knotted edges and bodily fluids preserved!"

Cui Jun did not clean up the object, but put it directly into the evidence bag.

"The murderer is very cautious!"

"Judging by the way the knot is tied, it's been done more than once."

"The murderer used such a protective tool when he violated Yanyan, which greatly avoided the loss of body fluids, so we should not detect anything in Yanyan's reproductive tract."

"The consequence of this cautious approach is that the killer's bodily fluids may not even be found at the scene."

"I never thought that Yanyan actually ate this thing. After the identification results come out, we will have the murderer's DNA!"

"He can't run!"

Cui Jun fastened the evidence bag, his eyes gleaming with firmness. As an old forensic doctor for many years, he knew very well what this level of evidence meant.

Now has the murderer's DNA!

As long as the identity can be successfully compared, it is equivalent to decisive evidence, and it is useless to deny it no matter what.

"Sister Yanyan..."

Zhou Zheng's eyes kept falling on the so-called physical evidence. He couldn't imagine how much courage it took to do such a thing. After all, it was something the murderer used to violate her.

Not only that, he thought it might be more than one time, and the last time, when he was discovered by the murderer...

It's not easy!

Zhou Zheng's eyes became serious. He carefully thought about the existing evidence and kept sorting out his thoughts. This case can be said to be the most complicated case he has ever dealt with since he joined the job. Of course, he has never been in contact with it before. Several cases.

In fact, such a case is a relatively rare serial case even in Xia Yan's career.

"Now that we have important physical evidence, the next step will be relatively easy. However, we still need to conduct a detailed and complete autopsy on the corpse. We cannot take it lightly just because we have gained something now!"

Cui Jun spoke suddenly, and he didn't know whether these words were addressed to Zhou Zheng or himself. In short, after he finished speaking, he picked up the scalpel again and continued the autopsy.

Zhou Zheng also held the camera steadily, but after discovering the physical evidence, his mood also relaxed a lot, and he didn't have the nervousness just now.

After completing a series of tests, Cui Jun confirmed that there were no other abnormalities, and then began to suture the opened chest and abdomen cavity of the corpse.

After the stitches were finished, his gaze turned to the lower body.

"The genital tract of the corpse has very complicated stab wounds. There are 12 wounds, and every two wounds correspond to the two sharp edges of the dagger. Stay." Cui Jun said coldly.

Zhou Zheng was holding a camera to record, while roughly judging the shape of the wound with his naked eyes. From the corner of the wound to the cavity of the wound to the edge of the wound, everything seemed to fit perfectly.

It is almost certain that these wounds were formed by this dagger!

"There is no special body fluid in the reproductive tract of the corpse, only the secretions and some oils belonging to the deceased can be extracted, and they are going to be sent to the laboratory for comparison."

Cui Jun took the cotton swab and put the extract into the storage tube. According to his preliminary judgment, the oil should be on the small bag, but there are too many substances attached to the small bag, and there may be no way to make a detailed inspection. .

"Zhou Zheng, do you have anything to add?" Cui Jun turned to look at Zhou Zheng.

"Hmm..." Zhou Zheng shook his head and said, "No."

"Then that's the end of the autopsy on the deceased Li Yanyan. After we dissect the rest of the autopsy, you will submit the forensic report. Now I will suture the body and reattach the dismembered body. "Cui Jun began to suture Li Yanyan's body tissue with a special needle holder for suture. Forensic doctors need to wear rubber gloves during the autopsy process. Holding the needle through the glove is very easy to slip, so in the When suturing, you will choose to use a needle holder.

Cui Jun quickly sewed up Li Yanyan's body again. He took one last look at Li Yanyan's face, and then pushed her into the temporary freezer in the dissecting room.

The dissection room of the City Bureau Forensic Medicine Center has a temporary freezer, which is slightly higher than the ice coffin, but not as high as an ordinary refrigerator. It is arranged in order from top to bottom, with a total of six floors, each of which can hold two Corpses, a total of twelve corpses can be temporarily stored.

Among them, the upper three layers are refrigerated layers, and the lower three layers are frozen layers, which is quite consistent with the usage habits of refrigerators.

This is in consideration of the fact that sometimes forensic doctors need continuous dissections, so these pre-inspected corpses can be thawed first in the cold storage layer, and the corpses after autopsy can be temporarily frozen in the freezer until all the dissections are completed. Move these corpses to the underground mortuary.

This can greatly save time and cost, and avoid wasting time on the way to and from the underground morgue when multiple corpses need to be dissected.

"Is there no other news about the body parts found on the cross-sea bridge?" After Cui Jun put Li Yanyan's body in, he obviously looked more relaxed, but judging from his body shape, he was much older.

"No." Zhou Zheng shook his head.

"Then let's start with the three corpses in the Jianghai City Library!" Cui Jun said solemnly: "These three corpses are all whole corpses. Relatively speaking, the source of the corpses is relatively easy to confirm, and they have a greater impact on the detection of the case." Help, besides, the fire in the library has more impact."

"Okay." Zhou Zheng nodded silently. What he is doing now is the work of an assistant. He is responsible for taking pictures, videos and writing reports. This is what Li Yanyan did before. Learning from Cui Jun, quietly accumulating experience.

"Then let's get started."

Cui Jun walked towards the temporary freezer in the dissection room, opened the top drawer on the right hand side, and a charred corpse was exposed in the eyes of the two of them.

After the drawer was opened, a burnt smell quickly emerged in the dissecting room. Even though it had been frozen and stored, after thawing, there was still a strong smell of barbecue.

In an instant, Zhou Zheng's stomach rumbled, and he felt a faint nausea.

Zhou Zheng resisted this unspeakable feeling, and assisted Cui Jun to put the charred corpse on the corpse bed, and then opened a little distance so that the air he could absorb between his breaths would not be so irritating. And raised the camera at the same time.

Even he himself couldn't tell what kind of feeling it was like. He had been to the scene of the fire last night, and the burnt smell was even stronger there, and he even found it difficult to breathe. The room was filled with poisonous gas .

However, in that environment, he didn't feel unbearable, but now he was clearly in the dissection room, and he was just facing a charred corpse.

"Isn't it delicious?" Cui Jun suddenly said, "You must be gluttonous!"

"Ah..." Zhou Zheng's eyebrows twitched fiercely. He never thought that the always serious master would actually tease him in the dissection room, which made him at a loss as to how to respond.

"Just kidding, I think you're too nervous, Yanyan's affairs are over, don't get lost in it." Cui Jun's tone contained sorrow that he tried his best to conceal.

"Understood." Zhou Zheng nodded, thinking to himself, it seems that Master is not as cold as he imagined, and he still cares about Sister Yanyan's death very much.

"I see what you did just now, you must have been stimulated by the smell of burnt corpses!" Cui Jun tried his best to relax himself.

"Well, Master, I actually have a question. I didn't want to ask it here, but I'll just ask it casually." Zhou Zheng hesitated for a moment, and said, "I went to the scene of the fire last night for identification. The smell is obviously more unpleasant, but I can survive it, but the smell of this burnt corpse makes me unacceptable, why is that?"

"It's very simple. After all, this is a human corpse. It is different from burning wood and plastic. The smell that is constantly emitted from the corpse is the unique smell produced after the body tissue is burned. This smell is not for us humans. It's so easy to accept." Cui Jun explained: "However, you don't have to worry too much, you will get used to it after a lot of experience."

"Okay...okay..." When Zhou Zheng heard Cui Jun's last words, he felt an inexplicable sadness in his heart. After going through it, he could indeed adapt, but he would rather not have such an experience.

For every burnt body examined, at least one person died in the fire.

Such a painful way to die!
When Zhou was studying forensic medicine, there was a kind of hope in his heart, hoping that more and more people in this world could die naturally, no matter whether they died of illness or old age, they would not be violently interfered or forced to die. Deprivation of the right to life.

After Cui Jun placed the charred corpse level, the corpse still showed a relatively hard fist fighting posture.

"What is the first step in examining the burnt corpse?" Cui Jun inspected the body of the corpse up and down, without looking at Zhou Zheng, but what he said was obviously testing Zhou Zheng.

"The first step is to determine whether to burn the body before death or burn the body after death. This can determine the nature of the case." Zhou Zheng replied.

"What kind of cases do these two types correspond to?" Cui Jun continued to ask.

"According to statistics, the vast majority of death by burning is accidental, with a probability of more than 90%, followed by suicide. It is relatively rare to kill by burning alone, and it is often carried out together with poison. However, when the conditions for poisoning are met When he died, he didn’t need to make a fire to burn him to death.” Zhou Zheng’s eyes were solemn, and he quickly analyzed: “The purpose of burning the body after death is to destroy the body and traces to cover up the crime, and it can almost be judged to be homicide!”

"Then let me ask you again, how to distinguish between burning dead before death and burning corpse after death?" Cui Jun asked again, he recognized Zhou Zheng's basic skills very much in his heart, although this is the basic quality that every forensic doctor should possess, But after all, Zhou Zheng has just come to practice and has not yet officially graduated. Being able to do this is already better than other interns.

"It can be identified through the carbon monoxide content in the skin, eyes, trachea, respiratory tract, lungs, and blood." Zhou Zheng replied.

"Tell me in detail." Cui Jun became more and more satisfied.

"If the fire scene did not cause the body to be carbonized so that it cannot be examined, then it can be identified by the life reaction of the skin. The skin of the burned corpse has erythema and blisters, etc. After death, there is no life reaction after burning the body." Zhou Zheng said silently. Extremely sensitive, it seems to have an effect of near-photographic memory. The knowledge he has learned in books seems to be printed in his head, and he can read it at any time.

"Continue." Cui Jun nodded.

"The signs of the eyes of the corpses can also be identified. The eyes of the burned corpses have eyelash symptoms and goose claw-like changes, but there are no such changes in the cremated corpses after death."

Zhou Zheng said slowly, and after finishing speaking, seeing that Cui Jun didn't respond, he continued to speak.

"The burnt corpses will have deposited soot and charcoal on the surface of mucous membranes such as the mouth, nose, throat, and trachea, but the burnt corpses will not have such signs."

"The rest of the body must be identified by autopsy to examine the internal signs of the corpse. The corpse burned to death before death, the deceased still has respiratory function during the process of burning to death, and the heat acts on the respiratory tract to cause damage, which has a typical heat effect respiratory syndrome. There is no such sign when the body is cremated after death.”

"The lungs of the corpses burned to death were obviously congested, edema, weight increased significantly, rich in protein fluid, and had typical shock lung changes, while the corpses burned after death did not have such symptoms."

"And..."

When Zhou Zheng said this, he paused for a moment, carefully looked at Cui Jun's face, confirmed that the latter still did not intend to stop him, and then continued.

"A large amount of carbon monoxide and poisonous gas will be produced in the fire scene. If burned to death before death, the deceased will inhale a large amount of carbon monoxide in the fire scene, which can be extracted from the blood of the corpse, and in the blood of the corpse burned after death, it is Carbon monoxide cannot be extracted." Zhou Zheng said slowly.

"It's almost enough. You know these are enough to distinguish whether to burn the body before death or to burn the body after death. The rest are just details, and I will leave it to you in time."

Cui Jun nodded, stopped examining the corpse, turned towards Zhou Zheng, raised his hand, and took the camera in Zhou Zheng's hand.

Such behavior caused a big question mark to pop up in Zhou Zheng's head.

However, at this moment, Cui Jun said something that shocked Zhou Zheng extremely.

"Zhou Zheng, you come to do the autopsy on this corpse, and I'll be watching from the side. You can do it freely, and I'll watch over it, so you won't make any mistakes!"

　Brothers ask for a monthly pass!
　　
　
(End of this chapter)