Chapter 677: From Nothing to Something

The criminal suspect left two scenes.

One is the residence of the deceased after being burned, and the other is the room rented by the murderer to observe the residence of the deceased.

The room after the fire must have limited things that can be surveyed. Jiang Yuan chose to check the room rented by the murderer first.

This room still has something. After all, although the murderer made some preparations, he was forced to leave, and he still left some things, including some traces of life.

If it were an ordinary criminal suspect, these things would be enough to locate his identity easily, and then it would be a typical pursuit work, which would not require an expert of Jiang Yuan's level to come out.

LV5 crime scene investigation is an explosive existence nationwide. Most provincial investigation experts are about LV3, and very few can reach LV4, which belongs to the top experts in the province. And nationwide, experts who can reach LV5 are also rare. In more than 30 provinces, municipalities, and regions, most do not have such resources. That is, places like Beijing, Shanghai, Guangzhou, Shenzhen, and Hong Kong might have a few, and it is uncertain where they are serving, whether they are traveling around the country, or even retired.

Don't look at the department where Qi Changye is, it's very awesome, but no matter how awesome the department is, resources are limited, and human resources are also the same.

In fact, because they are not responsible for solving social cases, nor do they have a large number of scenes to survey like the police, it is impossible to afford special awesome investigation experts. They borrow them when they use them.

Experts at the LV5 level will not let their talents be wasted. It is difficult to achieve raising without using, just like Jiang Yuan in Ningtai County. If Huang Qiangmin does not actively sell him, he will sooner or later be borrowed and lost.

The apartment rented by the murderer, the first four floors are shopping malls, and there are more than 20 floors of old-fashioned tower buildings above.

The location of the house is very good, because it is located in the center of the local business district. Daily needs can be reached on foot, but the composition of the building is complex. From the shopping mall downstairs to the apartment upstairs, as long as you can find the location of the elevator, the access control is almost meaningless—too many people come and go, just follow others.

The 6-elevator 36-household separation method also makes the security in the building a mere formality. Correspondingly, it is extremely difficult to get DNA and fingerprints from the corridor or elevator.

The room is a bit better, with an area of nearly 100 square meters, two bedrooms and one living room. An astronomical telescope is placed in the living room, with the mirror facing the balcony of the deceased's residence. The other two bedrooms, one also sees the target's window, and the other is used as a tool room, with more than a dozen tools placed on a long table, and some scattered parts placed on the two iron shelves in the room.

"When the deceased Zhang Xuanting smokes, he has the habit of opening the window, and the habit of smoking e-cigarettes is also like this. It is estimated that the murderer observed this characteristic, so he rented the house here." Qi Changye followed Jiang Yuan into the room and introduced the situation currently mastered.

"It's more reliable than using a sniper rifle in the movie." Jiang Yuan looked at the telescope with a stand and had a bit of a sense of substitution.

"To be honest, using explosives is much more reliable than a sniper rifle. Hmm, the murderer should also assemble explosives here. Explosives and the like have been taken away, but the remaining tools can still be judged." Qi Changye sighed and said: "So we must catch people quickly."

Jiang Yuan nodded silently. The murderer's target was obviously not Zhang Xuanting. It should be said that Zhang Xuanting was just a process leading to the target. Silencing him was more likely to delay time to achieve the real goal.

Therefore, the murderer's main business in this room might be assembling explosives, and monitoring or silencing Zhang Xuanting was more of a matter of convenience.

To a certain extent, Zhang Xuanting was more like a fuse. It burned out, and the murderer knew he should go.

"So, the murderer assembled explosives in this room, and because of a certain opportunity, decided to silence Zhang Xuanting." Jiang Yuan walked to the windowsill, looked at the dark night sky and bright lights outside, thought for a moment, and said: "The murderer used a remote control device to blow Zhang Xuanting to death when he was sure he was smoking an e-cigarette. Then, the murderer simply cleaned up the room, went downstairs to the opposite side, cleaned up Zhang Xuanting's house, then committed arson, and left?"

Jiang Yuan's speculation was a mode similar to crime scene reconstruction, just expanding the scope of the crime scene.

Qi Changye nodded slightly and said: "It is possible."

"Blowing someone to death, and then going to Zhang Xuanting's house to commit arson, would it be a bit superfluous?" Jiang Yuan asked back.

"Not really. Zhang Xuanting is a habitual thief and acts very carefully. Although the house he lives in is rented, the door locks and the like are all changed. The murderer also used violent means to pry the lock." Qi Changye was worried that Jiang Yuan didn't understand, and added: "When entering the house to kill, if the victim is prepared, it is still relatively dangerous. Life is one's own, and no one really likes to take risks."

"Just like when carnivores hunt, they all pursue no injury?" Jiang Yuan understood a little.

"About the same meaning. The area the murderer can observe is only so large. It is hard to say whether there are other preparations at home." Qi Changye paused and added: "In addition, the murderer may also have the meaning of confirming death, maybe he took something away..."

Jiang Yuan agreed when he heard this: "The explosive power of the e-cigarette might not be enough, it is possible that he didn't blow him to death."

While talking, Jiang Yuan started to take photos from beginning to end, and then checked little by little.

The scene here was naturally combed through once. Speaking of which, the first scene Jiang Yuan really went to was not many. Most experts actually have the same problem. Because they run around the country all year round, what they see are evidence that the local police have checked a round, and the difficulty is naturally more than one level higher.

Some serial killers fell into the hands of such experts. After committing crimes many times, they found that the police couldn't find them, so they committed crimes again in a very short time, and fell directly into the hands of experts who had not yet left, directly changing from cold cases to current cases, and then captured in one net...

"Looked at it here, go downstairs." Jiang Yuan spent more than two hours sweeping the house of less than 100 square meters.

Qi Changye had been impatient for a long time, and didn't dare to urge him. Only then did he ask: "Any discoveries?"

"The problem now is that even if the identity of the murderer is determined, it is likely to be a fake identity. In this way, conventional measures for identifying identity such as DNA and fingerprints are useless."

Qi Changye was stunned: "Indeed. Then... do you have any way?"

"Only let the evidence speak for itself, look again." Jiang Yuan actually had some micro-means, such as the secret weapon that often pulls the trigger, forensic botany, which can find the characteristics of specific locations. At this time, it might be useful.

However, forensic botany also has its troubles. One is that it is time-consuming and laborious to do. If Jiang Yuan starts looking for pollen now, it might be several days later when he finds the place, which does not meet the current pursuit.

What Qi Changye expects now is that Jiang Yuan directly reports the room number, and then rushes in for a burst of shooting.

And for Jiang Yuan, choosing which piece of pollen to use as a target is a trouble.

If there is a corpse, then don't say it, just find the pollen on the corpse, and most of the locations locked are meaningful. But in the murderer's residence, which place to choose, or which object to use as a target? It is very likely that after hard work, a meaningless result is found.

Therefore, using forensic botany at this time belongs to high-risk, high-input, high-return activities. Unless it is a last resort, Jiang Yuan doesn't want to choose.

The few turned to the residence of Zhang Xuanting after arson.

This is rented by Zhang Xuanting. The decoration, furniture, etc., are also provided by the landlord. After a fire and fire fighting, the items in the room are either burned or watered, and there is no intact part.

Such a fire scene, the evidence is basically damaged, but the fire scene itself is a piece of evidence, including smoke traces, burning traces, spreading traces, carbonization degree, etc., which can reflect the changes in the fire scene. Ordinary fire investigation personnel also do four-step exploration based on this, that is, environmental exploration, preliminary exploration, detailed exploration, and special exploration, etc.

Jiang Yuan did it all the way, and naturally obtained a series of evidence, but none of them played a decisive role.

"I'll go back and think about it, and I have to look at the surveillance again." Jiang Yuan is not in a hurry. In terms of skill level, he is now the top in the country. The murderer left a lot of clues. Now it just depends on which direction to cut in.

What's more, he still has moves that haven't been used.

Qi Changye couldn't help it even if he was in a hurry, so he could only follow Jiang Yuan.

After such a toss, when returning to the police station, it was already working hours.

Jiang Yuan was also very sleepy, but Qi Changye was guarding him, looking at himself with golden retriever-like eyes, plus the special nature of the case, Jiang Yuan could only cheer up, light a cup of coffee, and watch the video while drinking.

The murderer entered and left the apartment daily, inevitably being photographed with front and back photos, but the other party always wore a mask and sunglasses, and the collected facial information was slightly insufficient.

Jiang Yuan cut out a few pictures and did some image enhancement, and the effect was also very average.

Just kept watching, kept watching, and when Qi Changye was almost asleep in a daze, Jiang Yuan woke him up with a slap.

"The murderer's shoe cabinet, you look..." Jiang Yuan's eyes were a little red, but his eyes were still quite bright.

"Shoe cabinet..." Qi Changye frowned and looked at the photo Jiang Yuan showed, knowing that he would not shoot without a target, so he pondered carefully and said: "Is it the type of shoes? Outdoor shoes, hiking shoes, and formal leather shoes..."

"Look at what is missing." Jiang Yuan pointed to the empty spaces on the shoe cabinet, and took out a few more photos, saying: "Look at the shoes he wore at this time, none of them appeared in the shoe cabinet."

"The murderer took them away?" Qi Changye immediately thought of the reason, and frowned again: "He still has time to prepare his luggage, although it is a bit strange to bring a few more pairs of shoes..."

"He took away all Zegna shoes." Jiang Yuan interrupted Qi Changye's words, and took out a stack of printed photos for him, saying: "These are the shoe styles I checked on the official website. Compared with the shoe prints determined at the scene, the murderer took away at least four or five styles of this brand of shoes. It seems that he is a loyal fan of Zegna shoes."

Qi Changye nodded slowly: "Some people are used to wearing a certain style of shoes, they will keep repurchasing..."

Speaking of this, Qi Changye finally reacted: "Do you think he will repurchase this brand of shoes?"

"Trace back to the previous ones first." Jiang Yuan felt that Qi Changye was still a bit sleepy, and added: "Even if there are many rich people in the capital, buying multiple pairs of shoes of the same brand continuously, and it is size 43, and we know the color and appearance of four of the styles, we can always find some information about the customer."

Jiang Yuan pointed to the shoe style in the photo and emphasized: "As far as I know, luxury brands pay special attention to the long-term behavior of customers. If this person buys shoes as a new customer every time, it is estimated that he can only buy relatively basic styles. If he wants popular styles or limited editions, his membership must be kept for a long time... it depends on whether you can let the brand cooperate."

Qi Changye smiled, didn't answer Jiang Yuan's question at all, just nodded heavily: "This time he won't be able to run again." ===== CHAPTER 678 =====