Chapter 516

The car drove three kilometers and arrived at the second target area marked by Jiang Yuan.

Jiang Yuan got out of the car as usual and walked for a while, about 100 meters, and then waved for people to come over.

This is under the high wall of a villa community.

The wall is three or four meters high, and the top is also blocked by a layer of barbed wire, with the words "Danger of Electricity" written on it to scare people.

Below the wall is a green belt. Trees are planted next to the wall. The age of the trees is not very long, but it feels like they can be climbed up to look at the height inside the wall.

The width of the green belt is about three or four meters wide. The edge is also a circle of low-growing Euonymus japonicus. The dark green leaves are oval, and the leaf surface is smooth and hairless but extremely dense.

The green belt goes further out, which is the sidewalk and the road. On the other side of the road is another wall, inside which is another villa community.

This kind of road between villa community and villa community, on the side without garage exit, almost no cars go, occasionally passing by, also driving at a speed of 40 or 50 kilometers, pedestrians are also pitifully few. Jiang Yuan and others parked the car until now, and didn't find one.

If the criminal chooses this green belt and does things behind the shrubs, its concealment effect is similar to car shock. There is a very low probability of being discovered, but precisely because of this, it is extra exciting.

Jiang Yuan signaled the accompanying technicians to take photos and keep video recording, and said to Captain Pang Jidong: "It's here, check it again."

Jiang Yuan himself put on his equipment neatly and entered the green belt again to investigate.

Half an hour later, Jiang Yuan retreated in disappointment.

The place is correct, but no useful clues can be found.

It must be said that committing crimes in green belts here really has some advantages, especially things like rape, which are easy to leave some hair, dander, and various liquids on the ground because of intense movements.

If it is cement ground, looking for it after a period of time, maybe you can still find some residues. But in places like green belts, a large number of decomposers will automatically and consciously eliminate them.

Of course, there are dangers. Just like there are always people who are filmed when car shocking, and there are always people who can't sit still and run to the top of Sining Mountain, checking car by car...

"No clues found." Jiang Yuan shook his head when he returned to the car. Doing a crime scene investigation with concentration for half an hour is also quite tiring.

Captain Pang Jidong said hard work, looked at this second scene again, and couldn't help but say: "The criminal has to stay in the second scene for a long time, just do... crime in the green belt? Still too fearless."

"Judging from the pollen profile, it's here." Jiang Yuan also had no way to calculate the state when the case occurred, and used a discussion tone: "Could it be that what the criminal pursues is this kind of stimulation?"

Captain Pang Jidong said uncertainly: "It's possible. But doing this, the risk is still not small... four times without being noticed..."

This question is what Jiang Yuan couldn't solve. He waited for a while and said: "It's time to go to the first scene of the second victim."

"Okay..." Captain Pang Jidong responded, sat in the car, suddenly shook his head and smiled, saying: "I always feel strange. When we were in the special task force, we couldn't find the crime scene no matter how we looked, but it appeared one by one... I don't mean to doubt, I just feel that the world has changed so much."

"The accuracy of the pollen profile is still relatively high. Even if they are all green belts, the things planted are similar, but if you calculate the distance, the difference will not be very far. Moreover, don't look at the types of plants in the green belt are similar. In fact, under the shrubs, various plants will naturally grow, just like there will be weeds in the farmland..."

Jiang Yuan didn't explain the types of these plants in detail, but generally speaking, in a green belt hundreds of meters long, if the planting time is long and the area is not large, there will always be thirty or fifty kinds of wild grass and wild flowers.

Let Jiang Yuan explain it again, Captain Pang Jidong was a little embarrassed, waved his hand and said: "Every few years, new things will come out in the laboratory. I just can't learn it, but it's no problem to cooperate, don't worry, I won't drop the chain here..."

Seeing Jiang Yuan's previous case-solving process, Captain Pang Jidong only worried that his cooperation would have problems and drag Jiang Yuan's hind legs.

Jiang Yuan smiled, wanted to say two words of comfort, at this time, the system screen in front of him popped up:

Task: Old horse in the stable, ambition in a thousand miles.

Task content: The former Captain Pang Jidong was the young criminal police officer in the team who was most familiar with advanced technology. He was an emerging force with knowledge, culture, technology, and science. He used various technical forces to solve many major and important cases in succession, seeking justice for the dead and making the living safe... New technology in the new era is rushing towards him, and Captain Pang Jidong, who is nearly fifty, is struggling to keep up with the development of technology. Help him.

Task goal: Make Captain Pang Jidong fully understand the elements of forensic botany and be familiar with the ways and methods of using forensic botany to solve cases.

Jiang Yuan's eyelids jumped wildly, finished reading the system task, then turned to look at Captain Pang Jidong, couldn't help but frown.

Captain Pang Jidong is a person nearly 50 years old. His memory and comprehension must have declined a lot. And the content of forensic botany is really not small.

Even if the system doesn't require teaching him forensic botany, just learning to use forensic botany to solve cases, the complexity is high enough.

Most importantly, is Captain Pang Jidong willing to cooperate?

The new location specified by Jiang Yuan arrived soon.

This is the first scene of the second victim.

Compared with the first case, this case was only 8 days late, and the murderer's caution was greatly increased.

The first scene he chose was the bottom of a small bridge.

This bridge is only a few dozen meters long, and there is another 20-meter-long approach bridge. On both sides of the approach bridge are green belts and communities.

The place where the criminal committed the crime was in the green belt at the junction of the approach bridge and the small bridge.

The probability of being discovered here is relatively low, and even cars can be parked temporarily under the bridge, with space for three or four cars, no one manages, and no cameras.

Committing rape here, the stimulation might be reduced, but provoking the police about this matter will probably make up for the dopamine he lost.

Jiang Yuan found the place, first let other police officers take photos and video, and while putting on equipment, said to Captain Pang Jidong: "Pollen profile is also called pollen signature, meaning it is similar to the accuracy of a signature. This is not something that single pollen can prove. Single pollen can prove very little. You have to consider the possibility of drifting from the outside..."

He said while looking at Captain Pang Jidong.

Captain Pang Jidong, although a bit confused, still listened and nodded: "So it means that the types of pollen must be completely consistent, right?"

Jiang Yuan gave a brief introduction, and continued: "Not necessarily. It also depends on the type. Spores are everywhere in the modern living environment. Including the office buildings in the city, there will be pollen, but generally speaking, it is wind-pollinated. There are also pollen mainly based on insects and birds, and there are those based on water flow. Meeting the latter few types is different from the former few types..."

After the introduction, Jiang Yuan continued: "It is not an accurate quantification. Generally speaking, first determine the type, then find the scene, find the scene, and then determine the proportion..."

Jiang Yuan said with interest: "Of course, it is not purely impossible to quantify. Some spores, botanists study more, such as pine pollen of pine trees. Seeing this kind of wind-pollinated pollen with saccate structure, you know it is a long-distance transmission type. Even the distribution of pine pollen in the whole city, we have icons and some formulas. If you are not familiar with it, just check it..."

"And such as rush, sedge, rice straw, etc., they all have some of their own characteristics. Specifically, we can refer to some icons...":

Jiang Yuan said as he spoke, and saw that there was no light in Captain Pang Jidong's eyes, as if a child listening carefully, listening and listening, his eyes couldn't focus.

Jiang Yuan stopped, smiled and said: "Not urgent..."

Captain Pang Jidong was startled: "What's not urgent?"

"Nothing. I'll look at the scene first." Jiang Yuan said.

"Oh, I... I'll rest for a while." Captain Pang Jidong breathed a sigh of relief, only feeling that his brain was swollen.

Jiang Yuan gave Captain Pang Jidong a lesson and let him digest it for the time being.

As for whether Captain Pang Jidong is willing to learn... Jiang Yuan temporarily didn't give him this choice.

The third scene, still no useful clues.

Jiang Yuan is not in a hurry now. Knowing that the criminal is a cautious person, Jiang Yuan spent his mind teaching Captain Pang Jidong when doing crime scene investigation.

Captain Pang Jidong is old, and his reaction is slow. The advantage is that he is willing to listen.

For his generation, if someone is willing to teach things, at least respect must be expressed, otherwise it belongs to social problems.

The disadvantage is that at Captain Pang Jidong's age, learning things for a while, he starts to be confused...

Jiang Yuan paid attention to Captain Pang Jidong's expression and state. Seeing him awake, he outputted a lot. Seeing him dizzy, he let him rest.

The fourth scene...

The fifth scene...

The sixth scene...

By the time he ran to the seventh scene, Captain Pang Jidong was already not working. He fell asleep while listening on the road.

He didn't even realize what happened.

Jiang Yuan's sudden learning assistance used up Captain Pang Jidong's brain resources in a very short time.

He is now full of spores, and can't think of other problems.

The status of the few police officers on the side is also not good. They have more or less heard the content output by Jiang Yuan. Listening too much, it is like being polluted, their bodies are swaying, and their reactions start to slow down.

Jiang Yuan saw that the task was not completed, knowing that Captain Pang Jidong was not in place, but he couldn't accept it in a short time, so Jiang Yuan went down to the car himself and continued to do crime scene investigation.

Finally, it was the eighth scene, still no harvest.

The fact that no things were found in each scene actually explains a certain problem.

This shows on the one hand that the criminal is very careful. In the subsequent crime process, the proficiency may have improved, but on the other hand, Jiang Yuan feels that the possibility of the criminal returning to the scene.

It is not returning to the scene quickly, but returning to the scene after a period of time, and further cleaning the scene—the reason for such an idea is that the scene is too clean. 8 scenes, all are greening, no debris, no man-made products, although it is possible, it always gives people a feeling of being too clean.

This is not completely consistent with the sanitary condition of the green belt that Jiang Yuan saw along the way. Even if there are many villas and low-density residences nearby, large-area green belts always have some paper scraps, broken bottles, plastics, and the like.

However, these ideas of Jiang Yuan are also conjectures, and they are also unsupported by evidence.

After this trip, the clues truly obtained are actually the locations of 8 scenes.

The furthest distance between the 8 scenes is four or five kilometers, which is equivalent to being limited to an area.

"Go back. Today's crime scene investigation ends here." Jiang Yuan sat back in the car and patted Captain Pang Jidong.

Captain Pang Jidong twitched, as if he was awakened, his eyes were wide and godless. ===== CHAPTER 517 =====