The small building of Changyang Criminal Science and Technology Center is newly built with steel structure and large glass. It has a beautiful appearance and excellent light.
In the wide and spacious corridor, technicians pass by from time to time, or people simply wander by out of curiosity.
Wanbaoming ignored the technicians' explorations and sat in front of the computer. He showed the scene pictures of the 513 case to Jiang Yuan and introduced them by the way:
"This case was initially considered to be a vendetta. However, the elderly victim's children were out of town and he lived alone. In fact, there were fewer factors that attracted hatred. Therefore, this investigation direction was not continued."
"The second consideration was to seek money. However, there were no traces of theft in the old man's home. Judging from the traces, the murderer probably did not actually enter the deceased's home."
"The most likely motive, but the one that everyone is least willing to accept, is random killings... In this regard, the city bureau has been nervous for a while, worried that similar cases will appear again, but fortunately there are none."
"But the case dragged on day by day, and there was still no suspect."
Jiang Yuan listened to Wan Baoming's words and looked at the pictures of the scene one by one, but did not respond to him in time.
Wei Zhenguo frowned so much that he looked at the picture and said: "If it's a random killing, this case would be too complicated. The scene itself is very weak and has been trampled back and forth. There is no evidence at all.
This case cannot be solved."
He was trying to help Jiang Yuan solve the problem, and what he said made sense.
Random killings are inherently difficult cases.
If there are traces of passion killing, random killing is almost the perfect model of crime.
Because there is no preparation for committing a crime, most passion killings in modern society can be traced through surveillance and personnel investigation.
As for real random killings, especially those committed by a murderer with a certain force value, it is particularly difficult to solve the case.
In fact, when ordinary police solve cases, in addition to DNA, surveillance and mobile phones, they mainly rely on interpersonal relationships.
This method has been tried and tested repeatedly. It can be regarded as a general method.
It is equivalent to the standard procedure in solving equations.
As for standard procedures, what we are most afraid of encountering are special circumstances.
Regardless of Jiang Yuan's considerations, Wei Zhenguo first faced the difficulties and said:
"In this case, first of all, the contact time between the two parties was short. The victim opened the door and was probably stabbed to death by the murderer. The murderer killed the person cleanly. When he took away the murder weapon, he may have left too little evidence. There were no fingerprints.
There is probably no DNA, and the victim is older and most likely did not react and had no defensive behavior..."
"The murderer was very lucky. The neighbors were all elderly and did not know how to protect the scene. When the police came, the ground was in chaos."
"This blood stain has a different meaning from the blood stain used for blood stain analysis."
Wei Zhenguo now has a better understanding of Jiang Yuan's ability to analyze blood stains, and he can also guess the reason why Jiang Yuan requires blood stains, footprints, and comprehensive photography.
But from Wei Zhenguo's point of view, there was really too little blood stains at the scene. The area of the blood pool was large enough, but other than that, there were only some spray-like blood stains and a few dripping blood stains. Compared with what Jiang Yuan had done before,
The reconstructed site is quite different.
Wan Baoming patted his head and said with a smile: "I suddenly remembered this case, because within our Changyang Municipal Bureau, this case is still relatively famous. However, if it does not meet the requirements, we will look for other cases...
"
"No need." Jiang Yuan, who had seen almost half of the pictures, said softly at this time: "The basic requirements are met."
Wei Zhenxue coughed twice and said, "Jiang Yuan, let's find a suitable case first, get a good start, and then attack the tougher case."
This is also the strategy they designed on the road.
When doing a case, if you just dry fingerprints or DNA, you can do it in the office. At most, you only need to go out to the scene and re-investigate once or twice. These tasks can also be done by Jiang Yuan and Wang Zhong together.
Dry.
Including forensic work, just looking at pictures, dissecting cadavers, and looking at microscopes in the office, you can pretty much do it pretty well.
But when Jiang Yuan really follows a case, it often requires teamwork such as investigation and investigation. If a certain degree of trust is not established, it is unclear whether the Changyang City Criminal Police Detachment can cooperate and to what extent.
.
Especially when conducting investigations, if the investigation is not detailed enough or there are problems with the design of the investigation, it will be equivalent to discarding a string of clues.
Jiang Yuan looked at Wei Zhenguo and said with a smile: "The case has been seen here, it's here, so let's do it first."
"This..." Wei Zhenguo knew that Jiang Yuan was not the reckless type, so he blinked and decided to wait and see what would happen.
Jiang Yuan smiled at Wan Baoming again and said, "Let's take a look at this case first, but I'm not sure it's this case. I'll read the pictures of the scene first and then talk about it."
"Okay. There is no need to fix any case." Wanbao Ming thought to himself. Although Huang Qiangmin charges on a case-by-case basis, they are all at the county bureau level. As long as it is a murder case, he can accept it.
Jiang Yuan then continued to look at the photos.
Unlike what Wei Zhenguo thought, Jiang Yuan did not think this case was very difficult.
This is probably related to the skills Jiang Yuan has mastered. Bloodstain analysis is bloodstain analysis. When there is a lot of bloodstains, bloodstain analysis can be used to reconstruct the scene. When there are few bloodstains, it can still be used to analyze and get clues.
In fact, from a historical perspective, cases such as the "513 open-door stabbing murder case" were mainstream serious crimes 40 or 50 years ago.
Of course, it is a bit more difficult to stab him to death as soon as the door is opened, but the essence has not changed.
"Didn't you find the vehicle used by the murderer?" Jiang Yuan looked at the picture and asked.
Wan Baoming said: "Probably not. The local area is a suburban town with public transportation and many illegal cars. This line should not be investigated. Can I ask a police officer from the task force?"
"Okay." Jiang Yuan agreed.
Wan Baoming then went to make a phone call and came back after a while, saying: "There are still two people in the 513 task force, who are following us from beginning to end. The one who is coming now is Wang Chuanxing, who is in the detachment. He will be here in five minutes."
Theoretically, the homicide task force cannot cancel the case until it solves it. The difference is that the task force during the current case has sufficient resources and can bypass other cases and needs.
If the case is solved, everyone will be happy. If it is not solved, the number of people involved in the case will not continue to decrease, but eventually one or two people will be left working part-time.
These two people are not only responsible for holding meetings, they are also responsible for answering phone calls, summarizing clues, organizing information, processing documents, receiving family members of victims, etc.
The advantage of this is that there is someone who understands the case from beginning to end. When the case is reopened, the police officers responsible for the backlog of cases can learn the details of the case as quickly as possible. Especially those details that have not been written into the file.
While waiting for Wang Chuanxing, Mu Zhiyang and Wang Zhong were brought over.
Wei Zhenguo introduced each other and left the two of them alone.
Mu Zhiyang and Wang Zhong are as good as chickens.
The names of the Changyang City Criminal Police Detachment and the Criminal Investigation Center had a deterrent effect on both of them. As for the "random murder case", they had only seen it on TV.
After a few more minutes, a policeman entered the door carrying a box of information.
"Director Wan." Police officer Wang Chuanxing greeted.
This is a fair-skinned young policeman with a straight build, standing straight, bright eyes, and he looks like he is well-educated.
Wan Baoming asked him to sit down with a smile, and briefly introduced Jiang Yuan and others, then said: "Forensic Doctor Jiang has a few questions about the 513 case. See if you understand."
"No problem." Wang Chuanxing put the cardboard box on the table and said, "I also brought some information about the case... Well, is our case going to be restarted?"
After following a task force for three years, Wang Chuanxing also hopes that the case can be solved, comfort the family, and relieve everyone.
Wan Baoming shook his head first and said: "It's still early to restart. Let's understand the case first. If we can find new key clues, we will discuss restarting. By the way, the question that Forensic Doctor Jiang just asked me...the traffic used by the murderer
Did we find the tool now?"
"No." Wang Chuanxing shook his head and said: "The local traffic situation is very complicated. There is also a flooded river in front of Shunling Township. There is a wet season for half a year. It is also navigable. You can take some small boats. In addition, here
The township enterprise is mainly engaged in wood processing and has a small logistics park. It takes about thirty or forty minutes to walk from the logistics park to the victim's house. I walked through it myself."
If there is a logistics park, there will be large vehicles. Large vehicles can also carry passengers, especially those in logistics parks. Some cargo owners will escort the vehicles or take a ride.
Regardless of whether it is a large vehicle or a small boat, the troublesome point is that there are no records. Not to mention monitoring, there are no ticket sales points, and the vehicles and boats are not fixed.
Wang Chuanxing continued: "Shunling Township is also connected to expressways and national highways, as well as county and provincial roads, long-distance stations, and long-distance bus stations to Changyang City. There are also black cars and black motorcycles in the local area, so monitoring is basically useless...
"
Wang Chuanxing looked at Wan Baoming again and said: "The task force did not clear the transportation area at the beginning."
"Where are the witnesses?" Jiang Yuan continued to ask without surprise: "Did anyone hear the meter reading and didn't come out to see it? The murderer didn't go to other people's homes to read the meters?"
"I didn't go to other people's homes." Wang Chuanxing said: "This is what the neighbor next door described. The local residential area is a small courtyard next to a small courtyard, but many people have moved to other places. The victim's neighbor and his wife were then
I’m almost 70 years old, and it’s nap time in the afternoon. I just thought it was noisy outside, so I didn’t go out to see it.”
"Did anyone else hear this meter reading call?"
"Three or four people said they heard it."
"Where's the time? How long have you been shouting?"
"There are many stories. Some said they heard a few sounds, some said they heard the shouting for several minutes." Wang Chuanxing said: "They are all old men and women, and their ears are not very good."
"Yes, I understand." Jiang Yuan pondered for a moment and said, "So, how did you determine the direction of the investigation at that time?"
"Homicide caused by burglary or robbery." Wang Chuanxing said.
Wei Zhenguo asked: "Isn't it a random killing?"
"Someone may have suggested this at first. But the task force judged from several directions that it was not a random killing." Wang Chuanxing looked at Wei Zhenguo and said: "First of all, the location of the crime. The traffic in Shunling Township is relatively complicated, but it is a small town after all.
, a place that even outsiders have never heard of. The murderer came here specifically to commit the crime, so it is not a random act in itself."
Wang Chuanxing paused for a moment and then continued: "Reading electric meters is also relatively special. Changyang City stopped reading electric meters many years ago. The fact that the murderer shouted out like this means that he at least understands the situation and has at least stepped on it."
"The task force believed at the time that the murderer probably wanted to take advantage of the fact that there were many elderly people living alone in the local area and they were relatively wealthy, to deceive the door and commit robbery. Based on the situation in the community at that time, one or two people were enough to control the scene environment."
"According to our interview, the victim had the experience of joining the army, and usually has a strong personality. This may be the reason why the robbery went wrong, and the two suspects stopped their criminal plan!"
Jiang Yuan couldn't help but read that Wan Baoming and Wang Chuanxing's description were somewhat different from Wan Baoming's initial description.
Of course, the objective situation is the same. But from Wanbaoming's description, there is more uncertainty.
Wang Chuanxing's description seems to be more certain, but after careful consideration, it is mostly conjecture.
"Is there any evidence for the judgment of burglary or robbery?" Jiang Yuan then asked.
Wang Chuanxing said: "At that time, there were many thefts and robberies in Shunling Township. One of the cases was solved, and the culprits were two large truck drivers. Because after the local logistics park was built, freight costs became lower and lower, and local drivers'
My income was affected, and I was under pressure from mortgage and car loans, so I took risks..."
"So, do you think this case was also committed by the driver of the big truck? Then it should be investigated."
"Well, there are no results." Wang Chuanxing did not mince words, and added: "Local thieves and people with criminal records of violent crimes have also been investigated. No results."
Jiang Yuan nodded slowly, asked a few more questions, and said, "Then I want to go see the scene. Is Captain Wang free to join us?"
"Okay, you guys will set a time and let me know." Wang Chuanxing smiled, got up and went back.
Wan Baoming and others left and asked Jiang Yuan: "It seems that you have an idea?"
He is a technician by background, and he knows that as a technical person, if he does not have a strong purpose, his first choice is definitely not to go to the scene.
Paperwork is the method more recognized by technicians.
Jiang Yuan nodded and asked Wan Baoming: "It seems that you and the task force have some differences on this case?"
"It's out of the question. Differences are out of the question." Wan Baoming waved his hands repeatedly and said: "The task force is to solve real problems, and their purpose is to solve the case. Even I will not just tell them from the beginning.
If the case is determined to be a random crime, then how can we solve the case, right?"
"But do you think it was a random crime?" Jiang Yuan asked.
"Part of it." Wan Baoming's expression changed. He first looked at the door and saw no one, then whispered: "Although I don't respect the deceased to say this, but the romance of random crimes, I mean the romantic romance,
It’s really rare.”
Jiang Yuan took a look at Wan Baoming and saw that some things were indeed quite scarce.
