After listening to his words, I suddenly felt that the thief made sense, why didn't I think of it before? When he started to speak, I thought he was going to start talking again, but I didn't expect to say that Zhang Bin's thinking not only did not have the slightest deviation, but also was reasonable, relatively speaking, the Xiahai police who handled this case seemed a little pale and powerless.

I have been with Sun Jianguo before, and the work that Zhang Bin and I did was ordered by him, so I never found out that Zhang Bin still has this talent, so I feel that if Sun Jianguo retires or is transferred, he is simply the best choice to take over.

"Brother Bin, you can do this way, no wonder you can be given annual leave, when will I be like you?"

"When I have a small follower, I'll teach you a little more when I'm in a good mood one day, and I'm sure you can be used for life, except for those particularly cases, ordinary cases can easily catch the murderer, which is all the essence of my years as a policeman."

As soon as I heard that there was a doorway, I immediately asked: "Brother Bin, you see that I came from the grassroots level, when did I not be your little brother?" Right? So at this time, don't sell it, teach me? In the future, if you ask me to go east, I will never go west. ”

Zhang Bin tilted his head and asked, "Really?" ”

Feeling that there was a play, I hurriedly said, "It's true! I never lied to you. ”

"Okay, I'll teach you two first, if there is a homicide, you are in charge of this case, where will you investigate?"

"If it were me, I would definitely investigate the crime scene first, determine the nature of the murder, whether it was homicide or suicide, how many perpetrators there were, and then search for clues remaining at the scene, right?"

"That's right, but there are a few points you didn't expect, first of all, when investigating the crime scene, you must pay attention not to bring in your own things, so when we are handling the case, often there are only two or three people who enter the crime scene, and generally no more than three, the reason for this is to not destroy the scene, and after the first wave of inspections, other personnel will enter the scene, if no evidence is found, the crime scene will be kept to prevent others from entering."

"I heard about a case, after that case happened, no evidence was found at the scene at that time, so the scene was preserved, and after more than ten years, the people in the police station have changed several times, and the case was reopened for investigation, and after the unremitting efforts of the investigators, the DNA clues left by the murderer were finally found in a corner of the house, and the truth of the case was revealed."

"Therefore, after the death case, the first thing is to protect the scene of the crime, and then it is to conduct a trace examination, which has many aspects, the first is to determine the cause of death of the deceased, which is usually done by a forensic doctor, but an experienced trace examiner like me can also see a rough idea. After determining the cause of death, start to investigate the clues according to the cause of death, for example, if the deceased was hacked to death, then you have to search for relevant blunt and sharp objects, if the deceased is drowned, you have to look for a nearby water source to find evidence, if it was burned to death, you have to find the source of fire. In a word, you have to come step by step, and there is a debtor who is wronged. ”

"The second point is where clues appear frequently, according to my experience over the years, there are three main places where the murderer leaves clues, the door frame, the handrail, the faucet, and sometimes there are other places, but these three places are the hardest hit areas, because judging from the murderer's movement path, he will definitely come into contact with these places. You may wonder why faucets are also the hardest hit area, because I didn't understand it very well before, but then I realized it when I thought about it. ”

"Whether the murderer killed the deceased with a knife or with another murder weapon, then he would definitely go to the tap to wash his hands, and there is no doubt that he would do it regardless of whether there was blood on his body or hands. It may be that such a thing is done with the idea of washing away the sins of the hands, but of course it is a different matter if it is not committed in the deceased's home. ”

"After these investigations are completed, in the end, it is the investigation of peripheral clues, such as adjusting monitoring, visiting nearby residents or something, these are all put at the end, and the actions of the police in the sea are a negative teaching material, you see that they have not even determined the place where the body was dumped, and they are eager to find clues to the murderer, is this possible? Not at all. ”

"This is what the victim should do when he is killed at home, if the deceased is dumped elsewhere like this, then the first thing that should be done is to protect the scene, no matter what the case should be the first thing to pay attention to, even if the scene is destroyed by the onlookers because of the late arrival of the police, do not break the jar and break it, sometimes there are often some clues left at the scene, it depends on how to find it."

"After that, the medical examiner conducts an autopsy on the body, and the trace examiner investigates the traces at the scene, and one of the key points here is the role of trace physical evidence in the murder. There was a case where the deceased was killed by the murderer and then dumped his body in a lake, and no useful clues were found at the scene of the crime, and the forensic doctor did not find any useful clues from the deceased. ”

"Later, I went to the place where the body was dumped, and finally I found a clue in the grass on the edge of the lake, and found a steel ball the size of a soybean grain at the root of the grass, and the steel ball was stained with some oil.

"Therefore, no matter how seriously the scene is damaged, don't give up looking for clues, just like the cases we talked about last time, some cases are destined, and it is impossible to change them, it depends on how to solve the case."

"After the completion of the task of investigating the scene, it is necessary to infer how the murderer threw the body according to the surrounding clues, such as ruts, footprints, and drag marks, and many useful clues can often be obtained through these clues, such as the case in Guangbei last year, in that case, the murderer put the body in a sack, and then dragged it on the grass for a distance to throw the body, from which the murderer's height and body shape can be obtained."

"If there is nothing that can be done, the only way to do this is through visits and monitoring, which are often the next resort, and this trick will be used when there is nothing to be done, but basically there are no useful clues. A murderer with a little brain, as long as he doesn't kill in passion, won't be stupid enough to expose himself to the sight of others or cameras, unless it's a coincidence, that's what he should do. ”

"Okay, I'll teach you this for the time being, and I'll teach you the rest when I have time later, let's go upstream of the river and see if we can find some clues left by the murderer, although I don't like the police in Xiahai, but I'm even more unhappy with the murderer who committed this case."

Although what Zhang Bin said is not unpopular knowledge, nor is it a tall skill, but it is indeed a very important summary of the case-handling process, although I have experienced a lot of cases before, but I have never done this systematic summary, which will make my thinking from beginning to end. But listening to what he said at the end, I suddenly had a new idea: "Brother Bin, what if this person drank too much and fell into the river and died accidentally?" ”

Zhang Bin suddenly stopped, thought for a moment and said uncertainly: "Well, it seems that there is also such a possibility, let's ignore these for now, let's wait and see." ”

Except for the area near the bridge, which was cordoned off by the police, the other places were not isolated by the cordon. Walking upstream along the river, Zhang Bin and I have been observing the situation on both sides of the river to see if we can find useful clues.

To our surprise, it wasn't long before Zhang Bin and I noticed something unusual on the fence on the side of the river.

When I got closer, I noticed that the fence elsewhere was covered with dust, but here the dust had been scraped off, and from the marks on the edges, there was still half a palm print. Looking over the railing to see the river, there are also two palm prints on the stone steps on the back of the railing.

Zhang Bin leaned down and observed the palm print, and said with some doubts: "Someone has turned over in the water, the difference between the water surface and the shore is one meter five, the person who came should have stopped here by boat, and then climbed up, but why didn't he take the mainland and take the waterway?" ”

At this time, I didn't even want to blurt out: "The waterway is not monitored, he is avoiding the surveillance." ”

"It's a little reasonable, it's not bad, it's good, I've got a few true passes. Since it was to avoid surveillance, then he must have done something unseemly, and it was impossible to figure out that this neighborhood was the scene of the crime. Let's go around, and in order to prove that my reasoning is correct, I will take you to the theater. ”

Zhang Bin took me into a teahouse, sat down in a window position on the second floor, and looked out with a playful expression without even ordering a cup of tea.

"The Xiahai police should soon be able to investigate the identity of the deceased, and according to my speculation, the deceased's residence should be not far from here, this murderer is a stunned young man, if it were me, he would definitely not go by water, the risk is too great, and I feel like an opportunist."

An hour passed, two hours passed, and the Xiahai police did not wait, but waited for the waiter of the teahouse, saying that we were sitting here to occupy a place, and other guests had no place to sit.

So Zhang Bin was very unhappy and threw them a ticket and asked him to look at the two cups of tea. When the tea came up, Zhang Bin seemed even more comfortable, drinking tea, looking out of the window with interest over and over again, not in a hurry at all.

Finally, when it was almost twelve o'clock, three police cars stopped in front of a private house not far from the teahouse, and more than a dozen people came down from it, one of them knocked on the door, and when he found that there was no response, he directly took out his tools and broke into the door.