Chapter 1152: Is there evidence?

Jiang Yuan and the others arrived late, belonging to the seventh team to arrive, and there were three teams behind them.

Among them, the ones ranked at the forefront were the Changyang Municipal Criminal Police Detachment, the Shuidong District Bureau, and other large local criminal investigation units in Changyang. Behind them were the provincial department's criminal investigation general detachment that came to support, as well as criminal police teams led by well-known experts such as Ge Zhibing and Jiang Yuan.

For normal major cases, such heavy units might not necessarily take over directly, but more often adopt the way of guidance or providing support.

But in this case, facing a murder case directly aimed at an academician, units like the Changyang Municipal Criminal Police Detachment could only participate as a part.

The direct person in charge of the task force was already the Criminal Investigation Bureau of the Ministry. At this time, several people from the Criminal Investigation Bureau followed the director of the Changyang Municipal Bureau, thinking while listening to everyone's reports.

The director walked relatively fast in front of the first few display boards, and walked slower and slower behind. Obviously, more time brought more thinking, which was true for both sides. To a certain extent, this was also a brainstorming session belonging to the Chinese officialdom, serious, cautious, and requiring a huge amount of brain cells.

Huang Qiangmin waited until the leaders' team arrived at the previous one, and seeing that his whiteboard was still white, he asked Jiang Yuan: "Do you want to fill in something?"

"Which aspect? Oh... whiteboard? Wait a moment..." Jiang Yuan was actually quite nervous. He was flipping through pictures at high speed.

For a homicide case, there were too many photos taken at the scene. It can be imagined that several criminal photographers probably didn't leave their hands on the shutter.

If there was enough time, it would be acceptable to select these photos later. Or, it would be acceptable to take a quick look.

But if you are racing against time now, the above schemes are naturally not feasible.

Jiang Yuan tried his best to flip pages but didn't finish reading the photos, so he naturally had no time to analyze anything on the whiteboard.

His case-solving means are different from normal criminal investigation means. Normal criminal police usually start from analyzing the case. For a typical murder case, first of all, it should be analyzing the activities of criminals at the crime scene, how they entered the scene, how they killed people, whether there was interaction or fighting between the two sides, whether the victim resisted, whether the criminal was injured, and finally, how the criminal handled the corpse, how they left the scene, etc...

And for this academician murder case, the criminal's activities at the crime scene are clear, so the investigation can fast-forward to the step of confirming the criminal's identity.

At this time, two directions are naturally derived: is it to investigate by the criminal entering the scene, or to investigate by the criminal leaving the scene.

According to this line of thinking, investigating the direction of entering the scene, you can choose to investigate the vehicle, constantly trace forward through the vehicle's ownership, source, etc., to see if the criminal has revealed any flaws in a certain road section, such as revealing his face when passing a certain vehicle card point, or a simpler mode, the car is the criminal's own, or recently purchased...

Of course, for the source or ownership of the car, everyone is not too optimistic. If you can find the criminal directly through the car, he doesn't need to wear a ski mask premeditatedly, and he doesn't even need to escape. Surrendering is easier to survive. Relatively speaking.

And the way the criminal left the scene also has some anti-reconnaissance awareness.

It is not easy to trace the source of the mountain motorcycle, and the path of leaving is also difficult to trace. However, the criminal put the motorcycle here in advance, which means the criminal had stepped on the spot and prepared before.

Investigating based on this point may be a breakthrough.

Analyzing along this line of thinking, the criminal should have stepped on the spot more than once, and may even have stepped on the spot in other places where Academician Lou often enters and exits. Visiting and investigating from this point, maybe there will be a breakthrough.

Thinking deeper, why the criminal could wait at the intersection on time, where the news came from, or just wait all day long, is also a line of thinking.

If it is the former, catching the insider might solve the case directly. If it is the latter, asking the drivers or construction workers passing by, or the delivery boys or delivery restaurants nearby, maybe you can also determine the person directly.

Jiang Yuan is more about looking for physical evidence, and then conducting investigation and analysis based on physical evidence.

This way of thinking from the perspective of criminal investigation is obviously a bit rigid and backward. After all, adopting other investigation angles might be easier to break through.

It just so happens that Jiang Yuan is relatively good at this, and at this time, he also put a lot of effort into physical evidence analysis.

Until the director was about to come over, Huang Qiangmin urged again, and Jiang Yuan hesitated for a moment before getting up and writing a line on the whiteboard: Vehicle source, cigarette butt.

Without waiting for others to ask, the director had already walked over.

"Jiang Yuan is also here. I heard that you just completed a major drug trafficking case..." The director said some news seen on the intranet, then looked at Jiang Yuan's whiteboard, and couldn't help but smile: "Concise and comprehensive. Tell me, what are your thoughts?"

Jiang Yuan looked at Liu Jinghui and said first: "I have read the photos related to the vehicle scene and some vehicle card points. The management of muck trucks is relatively strict. I think investigating from the source of the vehicle should have gains."

"Can." The director nodded. This is not a surprising idea. The teams in front have all mentioned it.

Jiang Yuan added: "From the current point of view, the criminal should have waited at the scene for a long time, and the criminal is a smoker. From the cigarette ash in the cab, it can be seen that there is ash but no cigarette butt, which means that the position where the criminal waited is likely to have cigarette butts left behind."

The director nodded when he heard this.

Yu Wenshu on the side explained: "The scene is already collecting cigarette butts. However, the wind was very strong that night, and there were cars parked one after another near the location where the crime vehicle was parked. It will take some time to determine the personnel to whom the DNA of these cigarette butts belongs."

The DNA of cigarette butts is very easy to take, and it is one of the DNA carriers that the police like most. But DNA comparison does not necessarily hit directly, and even because there are many cigarette butts at the scene, it may be necessary to investigate one by one to determine the criminal's DNA. This step is a necessary step, but it will certainly not be very fast.

The director is responsible for being a good person, smiling: "The two directions Jiang Yuan considered are both very promising..."

"Finally, it is the question of the criminal's whereabouts." Jiang Yuan saved time for the leaders and added: "I tend to think that the criminal went to the Northeast."

"Ha?" The director and others who had watched six sets of display boards didn't expect Jiang Yuan to give such a direct answer, and their bodies that were preparing to move stiffened for a moment.

The director immediately asked: "Is there evidence?"

At this time, he needs evidence.