Jiang Yuan and others arrived late. They were the seventh team to come for help, and there were three more teams behind them.
Among them, at the front are the Changyang City Criminal Police Detachment, Shuidong District Bureau and other large local criminal investigation units in Changyang, followed by the provincial criminal investigation team who came to help, and the criminal police team led by well-known experts like Ge Zhibing and Jiang Yuan.
For normal serious cases, such heavy-duty units may not necessarily take over the case directly, but more often provide guidance or support.
But in this case, faced with a murder case directly targeting an academician, units such as the Changyang City Criminal Police Detachment could only participate as part of the case.
The direct person in charge of the task force was the Criminal Investigation Bureau of the Ministry. At this time, several people from the Criminal Investigation Bureau were following behind the director of the Changyang Municipal Bureau, thinking and listening to everyone's reports.
The director walked relatively quickly in front of the first few exhibition boards, but walked slower and slower in the back. Obviously, more time brings more thinking, and this is true for both parties. To a certain extent, this
It is also a brainstorming exercise that belongs to the Chinese officialdom. It is serious, formal and requires a huge amount of brain cells.
Huang Qiangmin waited until the leader's team came to the front. Seeing that the whiteboard on his side was still blank, he asked Jiang Yuan: "Do you want to fill in something?"
"Which aspect? Oh...whiteboard? Wait a minute..." Jiang Yuan was actually quite nervous. He was flipping through the pictures quickly.
For a murder case, there are too many photos taken at the scene. It is conceivable that multiple criminal cameramen probably never left the scene with their hands on the shutter.
If you have enough time, it is possible to select these photos later. Alternatively, it is not unacceptable to look at them quickly.
But if we are pressed for time now, the above solutions are naturally unfeasible.
Jiang Yuan flipped through the pages desperately and didn't even finish reading the photos, so naturally he didn't have time to analyze anything on the whiteboard.
There are differences between his methods of solving crimes and normal criminal investigation methods. Normal criminal police usually start by analyzing the case. In a typical murder case, the first step should be to analyze the activities of criminals at the crime scene and how they entered the scene.
How the murder was committed, whether there was interaction or struggle between the two parties, whether the victim resisted, whether the criminal was injured, and finally, how the criminal disposed of the body, how he left the scene, etc...
As for the academician's murder case, the murderer's activities at the crime scene were clear, so the investigation could fast forward to the step of confirming the identity of the murderer.
At this time, two directions naturally arise, one is to investigate through the murderer entering the scene, or the other is to investigate through the murderer leaving the scene.
According to this idea, when investigating the direction of entering the scene, you can choose to investigate the vehicle. Through the ownership and origin of the vehicle, you can continuously trace back to see if the murderer has shown his feet on a certain road section, such as passing through a certain vehicle stuck point.
At that time, the face was revealed, or in a simpler way, the car belonged to the murderer himself, or he had purchased it recently...
Of course, no one is too optimistic about the origin of the car or the road it belongs to. If the murderer can be found directly by passing the car, there is no need for him to put on a ski mask. He should not even run away. It would be more convenient to surrender.
Easy to survive. Relatively speaking.
The way the murderer left the scene also had some sense of counter-detection.
Leaving by mountain motorcycle, it is not easy to trace the source of the motorcycle, and it is also difficult to trace the path of departure. However, the murderer placed the motorcycle here in advance, which means that the murderer had visited the spot and prepared beforehand.
Investigating based on this point may be a breakthrough.
Analyzing along this line of thinking, the murderer should have stepped on the spot more than once, and may even have stepped on the spot in other places where Academician Lou often visited. If we visit and investigate this point, we may be able to make a breakthrough.
If you think about it more deeply, it is also an idea why the murderer was able to wait near the intersection on time, where he got the news, or why he just kept waiting all day long.
If it's the former, catching the traitor might solve the case directly. If it's the latter, you might be able to solve the problem directly by asking nearby drivers or construction workers, or nearby takeaway guys or even takeout restaurants.
Identify people.
Jiang Yuan is more interested in looking for physical evidence and then conducting investigation and analysis based on the physical evidence.
From the perspective of criminal investigation, this method is obviously a bit rigid and backward. After all, it may be easier to break through by adopting other investigation angles.
Jiang Yuan was quite good at this aspect, and at this time he also put a lot of effort into the analysis of physical evidence.
It wasn't until the director was about to come over that Huang Qiangmin hurriedly urged him again. Jiang Yuan hesitated for a moment, got up and wrote a line on the whiteboard: source of vehicle, cigarette butts.
Before anyone else could ask questions, the director had already walked over.
"Jiang Yuan is here too. I heard that you just completed a major drug trafficking case..." The director said some news from the intranet, then looked at Jiang Yuan's whiteboard and couldn't help but smile: "It's concise and concise, let's talk about it.
What do you think?"
Jiang Yuan glanced at Liu Jinghui and said first: "I took a look at the vehicle scene and some relevant photos of vehicle stuck points. The management of garbage trucks is relatively strict. I think there should be gains from investigating the source of the vehicles."
"Okay." The director nodded. This is not a surprising idea. The previous teams have mentioned it.
Jiang Yuan said again: "From the current point of view, the murderer should have been waiting at the scene for a long time, and the murderer smoked. It can be seen from the ash in the cab. There is ash but no cigarette butts, which means that the murderer is waiting in a very clear position.
There may be cigarette butts left behind.”
The director nodded.
Yu Wenshu, who was next to him, explained: "Cigarette butts are already being collected at the scene. However, the wind was very strong that night, and there were cars parked near the location where the crime vehicle was parked. We need to determine who the DNA of these cigarette butts belongs to.
It will take some time.”
The DNA from cigarette butts is very easy to obtain and is one of the favorite DNA carriers of the police. However, DNA comparison may not be a direct match. Even because there are many cigarette butts at the scene, it may be necessary to check them one by one to determine the DNA of the murderer.
The steps are necessary, but they certainly won't happen quickly.
The director was responsible for being a good person and said with a smile: "The two directions Jiang Yuan is considering are very promising..."
"The last point is the whereabouts of the murderer." Jiang Yuan saved time for the leader and added: "I tend to believe that the murderer went to the Northeast."
"Huh?" The director and others, who had already seen six sets of exhibition boards, did not expect Jiang Yuan to give such a direct answer, and their bodies that were about to move froze for a moment.
The director immediately asked: "Is there any evidence?"