The forensic doctor of the task force is none other than Zhang Yuanchao's disciple, doctoral student Li Changgeng. When Lu Chuan first did the identification and analysis of the bones, it was discovered when Li Changgeng was on duty.

The two have worked together many times during this time and are already familiar with each other.

"Lu Chuan, will you participate in the autopsy?" The in-situ investigator is invited to participate in the autopsy, mainly to investigate the surface traces of the corpse.

But this scene, in fact, is no longer necessary.

"Brother Li, the investigation in the room is basically over, and I won't participate in the corpse examination." The murderer committed the murder cleanly, killed people when he entered the house, and left after killing people, without touching the corpse.

This determination is based on footprints in the room. The footprints of entering and leaving are clear.

The trajectory of coming and going is easy to judge. Li Changgeng nodded and began to do the autopsy. The autopsies in these three cases were all handled by Li Changgeng.

Honestly, there's really not much to do. The cause of death of the corpse is clear, the method of death is clear, and the time of death is relatively easy to infer.

The corpse in front of him, with a light touch, Li Changgeng knew that the corpse's corpse had begun to disappear. Mortis is one of the most important criteria for judging the time of death of a corpse, especially a corpse that dies in a short period of time.

Generally speaking, mortis begins to appear 10 minutes to 7 hours after death, and the time is not particularly fixed, and it is related to different genders, ages, physical fitness, and obesity.

There is a certain pattern and sequence in which corpses appear to be mortis, such as from top to bottom or from bottom to top. Depending on the stiffness of the corpse in different parts, the time of death of the corpse can be determined.

In most cases, the rigor mortis reaches its peak between 24 and 48 hours, after which it gradually relieves.

After the third to seventh day, it will disappear completely, in the same order as it occurs.

The stiff part is relieved first. As one of the most obvious early phenomena of corpses, mortis is the most direct basis for forensic medicine to directly judge the time of death of the deceased.

As for why mortis occurs, there is no unified scientific conclusion. However, most scholars believe that it is related to human muscle, especially the breakdown of adenosine triphosphate.

"The cause of death of the male corpse was a slash on the neck, a broken wound, and death from excessive blood loss." The neck is broken, and before the brain is deprived of oxygen, the person will die from excessive blood loss.

That is, at the moment of being beheaded, the person is conscious. It's just that because the brain and body are separated, people can't react in that moment.

Nothing can be done except that the eyelids can blink.

"The time of death, between forty-eight and fifty-two hours."

"The cause of death of the female corpse is that the head is chopped off with a sharp weapon, the brain is bursting, and the brain is dead."

"The time of death, between forty-eight hours and fifty-two hours......" In the autopsy record book, Li Changgeng made a record while inspecting.

As with the current investigation, the forensic doctor will conduct a corpse examination at the scene of the crime, from top to bottom, from the outside to the inside, and take the lead in doing the surface examination of the corpse.

All inspection items have a prescribed process, and each completed item is filled in or checked in the record book.

When Li Changgeng was doing an autopsy, Lu Chuan followed the murderer's footsteps and came to the outside of the tile house. The weather in January was very cold, with a heavy snowfall just a week ago.

But the victim Zhao Dong is obviously a relatively diligent farmer, and the yard is cleaned clean, and there is no snow.

The murderer's footprints are relatively recognizable indoors, but they are unrecognizable outdoors.

The other party's killing speed in the room was very fast, and when the deceased's blood flowed to the ground, the murderer had already left.

Therefore, there was no blood stain on the murderer's footprints. All three scenes, all of them. This is the most difficult case Lu Chuan has experienced since he joined the police, and there is no one.

Except for the footprints, the other party basically left no traces. Even, Lu Chuan has conducted a trace physical evidence analysis of the traces of the murderer's footprints at the last two scenes.

Of course, the effect cannot be said to be absent at all. The shoes worn by the murderer were new shoes, the most common yellow rubber shoes.

It is sold in any market and supermarket on the market. As for the dirt and dust carried by the soles, there are no specific findings.

It can be said that with Lu Chuan's primary footprint identification and analysis ability at this stage, what he can do has reached the limit.

The sky is blue, windless and cloudless. Lu Chuan stood in the courtyard and took a deep breath. The air, which contains the peculiar smell of cow dung, fills the mouth and makes Lu Chuan feel a little sour.

Turning his head, in the west wing, five black and white cows were leisurely chewing the regurgitated grass in their stomachs, and their big eyes were very round and peaceful.

There is no awareness that his master has been killed, and he will not have forage consciousness in the future. Well? Forage? Lu Chuan was slightly stunned.

Zhao Dong has been dead for more than two days, why haven't these cows' forage been eaten yet? Lu Chuan stepped forward quickly, walked to the railing of the bullpen, and looked at the situation inside.

The fodder trough for the cattle has long been empty. But there was a lot of hay piled up on the ground, and the two cows were lying on their stomachs next to the hay pile, eating and chewing leisurely.

It's that kind of leisurely and comfortable, and there is a feeling of opening your mouth for dinner. In addition, there are two troughs made of plastic buckets in the cattle pen.

The semi-circular white plastic bucket looks like a large plastic bucket that has been cut in half horizontally to make a sink.

In the two sinks, the water stains are a little cloudy, but there is still a third of the water left. A calf is drinking water.

Of course, it should be gnawing on ice, the water has long been frozen into ice stacks, and the little cows are clattering.

After observing for a while, Lu Chuan looked at the layout of the courtyard again. Then put on his gloves again and opened the door of the unlocked East Wing warehouse.

A large pile of hay was neatly stacked, and there were three or four white plastic buckets about a meter high at the very end.

After a moment, Lu Chuan returned to the room. Sun Zhiyou, who reported the case, is still being questioned. Chen Kang saw Lu Chuan walking towards him, knowing that the other party might have something, he made a look, and seeing Lu Chuan nodding, Chen Kang looked at his colleagues beside him: "You continue to ask." Outside the room, Chen Kang took the Chinese cigarette handed over by Lu Chuan: "What's wrong brother, what's wrong?" "Although Lu Chuan is only a criminal police officer of the Haizhou City Criminal Investigation Detachment, his participation in the case this time is also a temporary transfer.

But Chen Kang and others had a very good attitude towards Lu Chuan. Although Lu Chuan is young, his current survey skills are really good.

After experiencing two murder scenes, everyone knows that Lu Chuan is professional in this aspect of current investigation. What's more, there will be footprint identification analysis.

Moreover, listening to Li Changgeng, Lu Chuan's skeleton identification and analysis is much more powerful than footprint analysis. Again...... When you meet, you will be a companion of Huazi, and no one will like it.

No, the two of them came out to smoke, and a few more criminal policemen came around. Lu Chuan casually took out a pack of new Chinese cigarettes, opened them and distributed them to everyone.

"This case...... It's tricky. ”

"No, this bastard is most likely professional, and the director is too special."

"Hey, there are no clues left, killing people is the same as killing chickens." Lu Chuan and the others are busy, and other criminal policemen are also busy.

The group of Yumin Village is a small tunzi, with a total of less than 30 households, and the total number of people in the whole village is more than 50 people.

In such a small place, it stands to reason that outsiders will be discovered as soon as possible. But it didn't.

"It may be that the murder was made at night, the victim's family is in Tunzi, and it may not be easy for outsiders to find out." Everyone, you and I talked about it.

Chen Kang smoked half a cigarette, listened for a while, and said to Lu Chuannu: "Xiao Lu, is there something wrong?" "I was questioning the informant just now, and it was impossible for Lu Chuan to interrupt him if he was fine.

"It's not a big deal, Brother Chen, when you ask the informant, by the way, ask the victim's cattle how they are usually fed?"